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The 2012 season’s official transaction log: 3,268 trades, signings and releases involving major-league clubs, listed newest first with MLB’s own description of each move.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 31, 2012 | Signed as free agent | Endy Chavez | — | Kansas City Royals | Kansas City Royals signed free agent LF Endy Chavez to a minor league contract and invited him to spring training. |
| Dec 31, 2012 | Signed as free agent | Miguel Tejada | — | Kansas City Royals | Kansas City Royals signed free agent 3B Miguel Tejada to a minor league contract and invited him to spring training. |
| Dec 31, 2012 | Signed as free agent | Dayan Díaz | — | Chicago Cubs | Chicago Cubs signed free agent RHP Dayan Diaz to a minor league contract and invited him to spring training. |
| Dec 28, 2012 | Signed as free agent | Rene Tosoni | — | Milwaukee Brewers | Milwaukee Brewers signed free agent LF Rene Tosoni to a minor league contract. |
| Dec 28, 2012 | Signed as free agent | Chad Tracy | — | Kansas City Royals | Kansas City Royals signed free agent 1B Chad Tracy to a minor league contract. |
| Dec 27, 2012 | Signed as free agent | Aaron Laffey | — | New York Mets | New York Mets signed free agent LHP Aaron Laffey to a minor league contract and invited him to spring training. |
| Dec 27, 2012 | Signed as free agent | Matt Antonelli | — | Cleveland Guardians | Cleveland Indians signed free agent 2B Matt Antonelli to a minor league contract. |
| Dec 27, 2012 | Signed as free agent | Ryan Rohlinger | — | Cleveland Guardians | Cleveland Indians signed free agent 3B Ryan Rohlinger to a minor league contract. |
| Dec 26, 2012 | Signed as free agent | A.J. Pierzynski | — | Texas Rangers | Texas Rangers signed free agent C A.J. Pierzynski. |
| Dec 26, 2012 | Trade | Joel Hanrahan | Pittsburgh Pirates | Boston Red Sox | Pittsburgh Pirates traded RHP Joel Hanrahan and 2B Brock Holt to Boston Red Sox for 2B Ivan De Jesus Jr., RHP Mark Melancon, RHP Stolmy Pimentel and LF Jerry Sands. |
| Dec 26, 2012 | Signed as free agent | Stephen Drew | — | Boston Red Sox | Boston Red Sox signed free agent SS Stephen Drew. |
| Dec 26, 2012 | Signed as free agent | Raul Ibanez | — | Seattle Mariners | Seattle Mariners signed free agent LF Raul Ibanez. |
| Dec 26, 2012 | Signed as free agent | Wilmin Rodriguez | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent Wilmin Rodriguez. |
| Dec 26, 2012 | Signed as free agent | Gregory Soto | — | Detroit Tigers | Detroit Tigers signed free agent LHP Gregory Soto to a minor league contract. |
| Dec 25, 2012 | Signed as free agent | Jaye Chapman | — | Chicago Cubs | Chicago Cubs signed free agent RHP Jaye Chapman to a minor league contract and invited him to spring training. |
| Dec 24, 2012 | Signed as free agent | Gil Velazquez | — | New York Yankees | New York Yankees signed free agent 2B Gil Velazquez to a minor league contract and invited him to spring training. |
| Dec 22, 2012 | Signed as free agent | Cody Ross | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent LF Cody Ross. |
| Dec 22, 2012 | Signed as free agent | Jim Hoey | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Jim Hoey to a minor league contract. |
| Dec 22, 2012 | Signed as free agent | Jeremy Moore | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LF Jeremy Moore to a minor league contract and invited him to spring training. |
| Dec 22, 2012 | Signed as free agent | Erick Threets | — | Colorado Rockies | Colorado Rockies signed free agent LHP Erick Threets to a minor league contract and invited him to spring training. |
| Dec 22, 2012 | Signed as free agent | Jeff Marquez | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Jeff Marquez to a minor league contract. |
| Dec 22, 2012 | Signed as free agent | Adam Greenberg | — | Baltimore Orioles | Baltimore Orioles signed free agent OF Adam Greenberg to a minor league contract. |
| Dec 22, 2012 | Signed as free agent | Ozzie Chavez | — | Milwaukee Brewers | Milwaukee Brewers signed free agent SS Ozzie Chavez to a minor league contract. |
| Dec 22, 2012 | Signed as free agent | Brian Gordon | — | Athletics | Oakland Athletics signed free agent RHP Brian Gordon to a minor league contract and invited him to spring training. |
| Dec 22, 2012 | Signed as free agent | Frank Gailey | — | Athletics | Oakland Athletics signed free agent LHP Frank Gailey to a minor league contract. |
| Dec 22, 2012 | Signed as free agent | Nattino Diplan | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Nattino Diplan to a minor league contract. |
| Dec 21, 2012 | Signed as free agent | Rich Harden | — | Minnesota Twins | Minnesota Twins signed free agent RHP Rich Harden to a minor league contract and invited him to spring training. |
| Dec 21, 2012 | Signed as free agent | Jose Veras | — | Houston Astros | Houston Astros signed free agent Jose Veras. |
| Dec 21, 2012 | Signed as free agent | Nate Schierholtz | — | Chicago Cubs | Chicago Cubs signed free agent RF Nate Schierholtz. |
| Dec 21, 2012 | Signed as free agent | Tom Gorzelanny | — | Milwaukee Brewers | Milwaukee Brewers signed free agent LHP Tom Gorzelanny. |
| Dec 21, 2012 | Signed as free agent | Jeremy Bonderman | — | Seattle Mariners | Seattle Mariners signed free agent RHP Jeremy Bonderman to a minor league contract and invited him to spring training. |
| Dec 21, 2012 | Signed as free agent | Gabe Suarez | — | Texas Rangers | Texas Rangers signed free agent 2B Gabe Suarez to a minor league contract. |
| Dec 21, 2012 | Signed as free agent | Zach Putnam | — | Chicago Cubs | Chicago Cubs signed free agent RHP Zach Putnam to a minor league contract and invited him to spring training. |
| Dec 21, 2012 | Signed as free agent | Luke Sommer | — | Detroit Tigers | Detroit Tigers signed free agent LHP Luke Sommer to a minor league contract. |
| Dec 21, 2012 | Signed as free agent | Mike Costanzo | — | Washington Nationals | Washington Nationals signed free agent 3B Mike Costanzo to a minor league contract. |
| Dec 21, 2012 | Signed as free agent | Yeiper Castillo | — | Chicago Cubs | Chicago Cubs signed free agent RHP Yeiper Castillo to a minor league contract. |
| Dec 21, 2012 | Signed as free agent | Eduardo Del Rosario | — | Minnesota Twins | Minnesota Twins signed free agent RHP Eduardo Del Rosario to a minor league contract. |
| Dec 20, 2012 | Signed as free agent | Mike Pelfrey | — | Minnesota Twins | Minnesota Twins signed free agent RHP Mike Pelfrey. |
| Dec 20, 2012 | Signed as free agent | Mike Adams | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Mike Adams. |
| Dec 20, 2012 | Signed as free agent | Placido Polanco | — | Miami Marlins | Miami Marlins signed free agent 3B Placido Polanco. |
| Dec 20, 2012 | Signed as free agent | Yoshinori Tateyama | — | Texas Rangers | Texas Rangers signed free agent RHP Yoshinori Tateyama to a minor league contract and invited him to spring training. |
| Dec 20, 2012 | Signed as free agent | Ramiro Pena | — | Atlanta Braves | Atlanta Braves signed free agent 2B Ramiro Pena. |
| Dec 20, 2012 | Signed as free agent | Dave Bush | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Dave Bush to a minor league contract and invited him to spring training. |
| Dec 20, 2012 | Signed as free agent | Zech Zinicola | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Zech Zinicola to a minor league contract. |
| Dec 20, 2012 | Signed as free agent | Rusty Ryal | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent 2B Rusty Ryal to a minor league contract. |
| Dec 20, 2012 | Signed as free agent | Derrick Robinson | — | Cincinnati Reds | Cincinnati Reds signed free agent CF Derrick Robinson to a minor league contract and invited him to spring training. |
| Dec 20, 2012 | Signed as free agent | Mike Jacobs | — | Seattle Mariners | Seattle Mariners signed free agent 1B Mike Jacobs to a minor league contract and invited him to spring training. |
| Dec 20, 2012 | Signed as free agent | Rusty Ryal | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent Rusty Ryal. |
| Dec 20, 2012 | Signed as free agent | Doug Mathis | — | Miami Marlins | Miami Marlins signed free agent RHP Doug Mathis to a minor league contract and invited him to spring training. |
| Dec 20, 2012 | Signed as free agent | Audy Ciriaco | — | Miami Marlins | Miami Marlins signed free agent SS Audy Ciriaco to a minor league contract. |
| Dec 20, 2012 | Signed as free agent | Miles Durham | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 1B Miles Durham to a minor league contract. |
| Dec 20, 2012 | Signed as free agent | Craig Albernaz | — | Tampa Bay Rays | Tampa Bay Rays signed free agent C Craig Albernaz to a minor league contract and invited him to spring training. |
| Dec 20, 2012 | Signed as free agent | Stefan Gartrell | — | Chicago White Sox | Chicago White Sox signed free agent RF Stefan Gartrell to a minor league contract and invited him to spring training. |
| Dec 20, 2012 | Signed as free agent | Jonathan Vargas | — | Colorado Rockies | Colorado Rockies signed free agent LHP Jonathan Vargas to a minor league contract. |
| Dec 19, 2012 | Signed as free agent | Alfredo Figaro | — | Milwaukee Brewers | Milwaukee Brewers signed free agent Alfredo Figaro. |
| Dec 19, 2012 | Signed as free agent | Brian Jeroloman | — | Cleveland Guardians | Cleveland Indians signed free agent Brian Jeroloman. |
| Dec 19, 2012 | Released | Adam Wilk | — | Detroit Tigers | Detroit Tigers released LHP Adam Wilk. |
| Dec 19, 2012 | Signed as free agent | Ryan Dempster | — | Boston Red Sox | Boston Red Sox signed free agent RHP Ryan Dempster. |
| Dec 19, 2012 | Trade | Rob Rasmussen | Houston Astros | Los Angeles Dodgers | Los Angeles Dodgers traded RHP John Ely to Houston Astros for LHP Rob Rasmussen. |
| Dec 19, 2012 | Signed as free agent | Zach Braddock | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Zach Braddock to a minor league contract and invited him to spring training. |
| Dec 19, 2012 | Signed as free agent | Travis Ishikawa | — | Baltimore Orioles | Baltimore Orioles signed free agent 1B Travis Ishikawa to a minor league contract and invited him to spring training. |
| Dec 19, 2012 | Signed as free agent | Daniel Schlereth | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Daniel Schlereth to a minor league contract and invited him to spring training. |
| Dec 19, 2012 | Trade | Kendrys Morales | Los Angeles Angels | Seattle Mariners | Los Angeles Angels traded 1B Kendrys Morales to Seattle Mariners for LHP Jason Vargas. |
| Dec 19, 2012 | Signed as free agent | Jeff Francis | — | Colorado Rockies | Colorado Rockies signed free agent LHP Jeff Francis. |
| Dec 19, 2012 | Signed as free agent | Ichiro Suzuki | — | New York Yankees | New York Yankees signed free agent RF Ichiro Suzuki. |
| Dec 19, 2012 | Signed as free agent | Justin Berg | — | Colorado Rockies | Colorado Rockies signed free agent RHP Justin Berg to a minor league contract. |
| Dec 19, 2012 | Signed as free agent | Joshua Rodriguez | — | New York Mets | New York Mets signed free agent SS Josh Rodriguez to a minor league contract. |
| Dec 19, 2012 | Signed as free agent | Kevin Whelan | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Kevin Whelan to a minor league contract. |
| Dec 19, 2012 | Signed as free agent | Tim Gustafson | — | Colorado Rockies | Colorado Rockies signed free agent RHP Tim Gustafson to a minor league contract. |
| Dec 19, 2012 | Signed as free agent | Fabio Castro | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LHP Fabio Castro to a minor league contract. |
| Dec 19, 2012 | Signed as free agent | Omar Luna | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent 2B Omar Luna to a minor league contract and invited him to spring training. |
| Dec 19, 2012 | Signed as free agent | Edgar Alberto Garcia | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Edgar Garcia to a minor league contract. |
| Dec 19, 2012 | Signed as free agent | Leury Bonilla | — | Seattle Mariners | Seattle Mariners signed free agent 3B Leury Bonilla to a minor league contract. |
| Dec 19, 2012 | Signed as free agent | Gustavo Molina | — | Colorado Rockies | Colorado Rockies signed free agent C Gustavo Molina to a minor league contract and invited him to spring training. |
| Dec 18, 2012 | Signed as free agent | Hiroyuki Nakajima | — | Athletics | Oakland Athletics signed free agent SS Hiroyuki Nakajima. |
| Dec 18, 2012 | Trade | Collin Cowgill | Athletics | New York Mets | Oakland Athletics traded CF Collin Cowgill to New York Mets for 3B Jefry Marte. |
| Dec 18, 2012 | Signed as free agent | Koji Uehara | — | Boston Red Sox | Boston Red Sox signed free agent RHP Koji Uehara. |
| Dec 18, 2012 | Signed as free agent | John Lannan | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LHP John Lannan. |
| Dec 18, 2012 | Signed as free agent | Ryan Langerhans | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LF Ryan Langerhans to a minor league contract and invited him to spring training. |
| Dec 18, 2012 | Signed as free agent | Ramón Ortiz | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Ramon Ortiz to a minor league contract and invited him to spring training. |
| Dec 18, 2012 | Signed as free agent | Lance Zawadzki | — | Toronto Blue Jays | Toronto Blue Jays signed free agent 2B Lance Zawadzki to a minor league contract and invited him to spring training. |
| Dec 18, 2012 | Signed as free agent | Mark Reynolds | — | Cleveland Guardians | Cleveland Indians signed free agent 3B Mark Reynolds. |
| Dec 18, 2012 | Signed as free agent | Roberto Hernandez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Roberto Hernandez. |
| Dec 18, 2012 | Signed as free agent | Corky Miller | — | Cincinnati Reds | Cincinnati Reds signed free agent C Corky Miller to a minor league contract and invited him to spring training. |
| Dec 18, 2012 | Signed as free agent | Damaso Espino | — | Chicago White Sox | Chicago White Sox signed free agent C Damaso Espino to a minor league contract. |
| Dec 18, 2012 | Signed as free agent | Alexis Lara | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Alexis Lara to a minor league contract. |
| Dec 18, 2012 | Signed as free agent | Marcel Prado | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Marcel Prado to a minor league contract. |
| Dec 18, 2012 | Signed as free agent | Chris Wade | — | Baltimore Orioles | Baltimore Orioles signed free agent SS Chris Wade to a minor league contract. |
| Dec 18, 2012 | Signed as free agent | Tony Davis | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Tony Davis to a minor league contract. |
| Dec 18, 2012 | Signed as free agent | Matt Palmer | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Matt Palmer to a minor league contract and invited him to spring training. |
| Dec 18, 2012 | Signed as free agent | Ricky Schwarz | — | Minnesota Twins | Minnesota Twins signed free agent OF Ricky Schwarz to a minor league contract. |
| Dec 18, 2012 | Signed as free agent | Oliver Veliz | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Oliver Veliz to a minor league contract. |
| Dec 17, 2012 | Signed as free agent | Aníbal Sánchez | — | Detroit Tigers | Detroit Tigers signed free agent RHP Anibal Sanchez. |
| Dec 17, 2012 | Signed as free agent | Donnie Murphy | — | Milwaukee Brewers | Milwaukee Brewers signed free agent 3B Donnie Murphy to a minor league contract and invited him to spring training. |
| Dec 17, 2012 | Signed as free agent | Chang-Yong Lim | — | Chicago Cubs | Chicago Cubs signed free agent RHP Chang-Yong Lim to a minor league contract. |
| Dec 17, 2012 | Signed as free agent | Carlos Pena | — | Houston Astros | Houston Astros signed free agent 1B Carlos Pena. |
| Dec 17, 2012 | Trade | Josh Thole | New York Mets | Toronto Blue Jays | New York Mets traded C Josh Thole, C Mike Nickeas and RHP R.A. Dickey to Toronto Blue Jays for C John Buck, RHP Noah Syndergaard, C Travis d'Arnaud and OF Wuilmer Becerra. |
| Dec 17, 2012 | Signed as free agent | Luis Antonio Rodriguez | — | Los Angeles Angels | Los Angeles Angels signed free agent 2B Luis Rodriguez to a minor league contract and invited him to spring training. |
| Dec 17, 2012 | Signed as free agent | Dallas McPherson | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent 3B Dallas McPherson to a minor league contract and invited him to spring training. |
| Dec 17, 2012 | Signed as free agent | Warner Madrigal | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Warner Madrigal to a minor league contract and invited him to spring training. |
| Dec 17, 2012 | Signed as free agent | Drew Carpenter | — | Chicago Cubs | Chicago Cubs signed free agent RHP Drew Carpenter to a minor league contract and invited him to spring training. |
| Dec 17, 2012 | Signed as free agent | Chris Gutierrez | — | Miami Marlins | Miami Marlins signed free agent SS Chris Gutierrez to a minor league contract. |
| Dec 17, 2012 | Signed as free agent | Williams Ramirez | — | Minnesota Twins | Minnesota Twins signed free agent RHP Williams Ramirez to a minor league contract. |
| Dec 17, 2012 | Signed as free agent | Daniel Pilar | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Daniel Pilar to a minor league contract. |
| Dec 17, 2012 | Signed as free agent | Oscar Rojas | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Oscar Rojas to a minor league contract. |
| Dec 16, 2012 | Signed as free agent | Rayder Ascanio | — | Seattle Mariners | Seattle Mariners signed free agent SS Rayder Ascanio to a minor league contract. |
| Dec 15, 2012 | Signed as free agent | Josh Hamilton | — | Los Angeles Angels | Los Angeles Angels signed free agent LF Josh Hamilton. |
| Dec 15, 2012 | Signed as free agent | Russell Mitchell | — | Colorado Rockies | Colorado Rockies signed free agent 3B Russell Mitchell to a minor league contract. |
| Dec 15, 2012 | Signed as free agent | Josh Bell | — | Chicago White Sox | Chicago White Sox signed free agent 3B Josh Bell to a minor league contract and invited him to spring training. |
| Dec 15, 2012 | Signed as free agent | Ralph Henriquez | — | Colorado Rockies | Colorado Rockies signed free agent C Ralph Henriquez to a minor league contract. |
| Dec 15, 2012 | Signed as free agent | Tim Sexton | — | Colorado Rockies | Colorado Rockies signed free agent RHP Tim Sexton to a minor league contract. |
| Dec 15, 2012 | Signed as free agent | Ramses Herrera | — | Minnesota Twins | Minnesota Twins signed free agent RHP Ramses Herrera to a minor league contract. |
| Dec 14, 2012 | Signed as free agent | Xavier Nady | — | Kansas City Royals | Kansas City Royals signed free agent LF Xavier Nady to a minor league contract and invited him to spring training. |
| Dec 14, 2012 | Signed as free agent | Kevin Youkilis | — | New York Yankees | New York Yankees signed free agent 3B Kevin Youkilis. |
| Dec 14, 2012 | Signed as free agent | Ty Wigginton | — | St. Louis Cardinals | St. Louis Cardinals signed free agent 1B Ty Wigginton. |
| Dec 14, 2012 | Signed as free agent | Niuman Romero | — | Baltimore Orioles | Baltimore Orioles signed free agent 2B Niuman Romero to a minor league contract and invited him to spring training. |
| Dec 14, 2012 | Signed as free agent | Joe Martinez | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Joe Martinez to a minor league contract and invited him to spring training. |
| Dec 14, 2012 | Signed as free agent | Loek Van Mil | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Loek Van Mil to a minor league contract. |
| Dec 14, 2012 | Signed as free agent | Chase Johnson | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Chase Johnson to a minor league contract. |
| Dec 14, 2012 | Signed as free agent | John Suomi | — | Philadelphia Phillies | Philadelphia Phillies signed free agent C John Suomi to a minor league contract. |
| Dec 14, 2012 | Signed as free agent | Yael Regalado | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Yael Regalado to a minor league contract. |
| Dec 14, 2012 | Signed as free agent | Eliezer Alfonzo | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent C Eliezer Alfonzo to a minor league contract and invited him to spring training. |
| Dec 14, 2012 | Signed as free agent | Ariel Jurado | — | Texas Rangers | Texas Rangers signed free agent RHP Ariel Jurado to a minor league contract. |
| Dec 13, 2012 | Signed as free agent | Jack Hannahan | — | Cincinnati Reds | Cincinnati Reds signed free agent 3B Jack Hannahan. |
| Dec 13, 2012 | Signed as free agent | Shane Victorino | — | Boston Red Sox | Boston Red Sox signed free agent RF Shane Victorino. |
| Dec 13, 2012 | Signed as free agent | Kevin Correia | — | Minnesota Twins | Minnesota Twins signed free agent RHP Kevin Correia. |
| Dec 13, 2012 | Signed as free agent | Nate McLouth | — | Baltimore Orioles | Baltimore Orioles signed free agent LF Nate McLouth. |
| Dec 13, 2012 | Signed as free agent | Jermaine Mitchell | — | Philadelphia Phillies | Philadelphia Phillies signed free agent CF Jermaine Mitchell to a minor league contract and invited him to spring training. |
| Dec 13, 2012 | Trade | Vince Belnome | San Diego Padres | Tampa Bay Rays | Tampa Bay Rays traded LHP Chris Rearick to San Diego Padres for 2B Vince Belnome. |
| Dec 13, 2012 | Signed as free agent | Andres Torres | — | San Francisco Giants | San Francisco Giants signed free agent LF Andres Torres. |
| Dec 13, 2012 | Signed as free agent | Cory Wade | — | Chicago Cubs | Chicago Cubs signed free agent RHP Cory Wade to a minor league contract and invited him to spring training. |
| Dec 13, 2012 | Signed as free agent | Blake Davis | — | Milwaukee Brewers | Milwaukee Brewers signed free agent 2B Blake Davis to a minor league contract. |
| Dec 13, 2012 | Signed as free agent | John Maine | — | Miami Marlins | Miami Marlins signed free agent RHP John Maine to a minor league contract and invited him to spring training. |
| Dec 13, 2012 | Signed as free agent | Justin Dalles | — | Philadelphia Phillies | Philadelphia Phillies signed free agent C Justin Dalles to a minor league contract. |
| Dec 13, 2012 | Signed as free agent | Brian Bocock | — | Washington Nationals | Washington Nationals signed free agent SS Brian Bocock to a minor league contract. |
| Dec 13, 2012 | Signed as free agent | John Maine | — | Miami Marlins | Miami Marlins signed free agent John Maine. |
| Dec 13, 2012 | Signed as free agent | Henry Wrigley | — | Colorado Rockies | Colorado Rockies signed free agent 1B Henry Wrigley to a minor league contract and invited him to spring training. |
| Dec 12, 2012 | Signed as free agent | Mike McClendon | — | Colorado Rockies | Colorado Rockies signed free agent RHP Mike McClendon to a minor league contract and invited him to spring training. |
| Dec 12, 2012 | Signed as free agent | Jason Grilli | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Jason Grilli. |
| Dec 12, 2012 | Signed as free agent | Sean Burnett | — | Los Angeles Angels | Los Angeles Angels signed free agent LHP Sean Burnett. |
| Dec 12, 2012 | Signed as free agent | Joe Blanton | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Joe Blanton. |
| Dec 12, 2012 | Signed as free agent | Gregorio Petit | — | San Diego Padres | San Diego Padres signed free agent SS Gregorio Petit to a minor league contract and invited him to spring training. |
| Dec 12, 2012 | Signed as free agent | René Rivera | — | San Diego Padres | San Diego Padres signed free agent C Rene Rivera to a minor league contract and invited him to spring training. |
| Dec 12, 2012 | Signed as free agent | Brandon Snyder | — | Texas Rangers | Texas Rangers signed free agent 1B Brandon Snyder to a minor league contract and invited him to spring training. |
| Dec 12, 2012 | Trade | Jake Lemmerman | Los Angeles Dodgers | St. Louis Cardinals | St. Louis Cardinals traded 2B Skip Schumaker to Los Angeles Dodgers for SS Jake Lemmerman. |
| Dec 12, 2012 | Signed as free agent | Ian Stewart | — | Chicago Cubs | Chicago Cubs signed free agent 3B Ian Stewart. |
| Dec 12, 2012 | Signed as free agent | Logan Mahon | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Logan Mahon to a minor league contract. |
| Dec 12, 2012 | Signed as free agent | Mitch Canham | — | Kansas City Royals | Kansas City Royals signed free agent C Mitch Canham to a minor league contract. |
| Dec 12, 2012 | Signed as free agent | Jeff Gray | — | Chicago White Sox | Chicago White Sox signed free agent RHP Jeff Gray to a minor league contract and invited him to spring training. |
| Dec 12, 2012 | Signed as free agent | Cole Gillespie | — | San Francisco Giants | San Francisco Giants signed free agent LF Cole Gillespie to a minor league contract and invited him to spring training. |
| Dec 12, 2012 | Signed as free agent | Nelson Figueroa | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Nelson Figueroa to a minor league contract and invited him to spring training. |
| Dec 12, 2012 | Signed as free agent | Garrett Wittels | — | St. Louis Cardinals | St. Louis Cardinals signed free agent SS Garrett Wittels to a minor league contract. |
| Dec 12, 2012 | Signed as free agent | Raymon Tenias | — | Seattle Mariners | Seattle Mariners signed free agent C Raymon Tenias to a minor league contract. |
| Dec 12, 2012 | Signed as free agent | Wendolyn Bautista | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Wendolyn Bautista to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Claudio Vargas | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Claudio Vargas to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Rich Thompson | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Rich Thompson to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Juan Pablo Pérez | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Juan Perez to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Eugenio Velez | — | Toronto Blue Jays | Toronto Blue Jays signed free agent 2B Eugenio Velez to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Luis Jimenez | — | Toronto Blue Jays | Toronto Blue Jays signed free agent 1B Luis Jimenez to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Willy Taveras | — | Kansas City Royals | Kansas City Royals signed free agent CF Willy Taveras to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Dan Wheeler | — | Kansas City Royals | Kansas City Royals signed free agent RHP Dan Wheeler to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Scott Elarton | — | Minnesota Twins | Minnesota Twins signed free agent RHP Scott Elarton to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Brandon McCarthy | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Brandon McCarthy. |
| Dec 11, 2012 | Trade | Shin-Soo Choo | Cleveland Guardians | Cincinnati Reds | Cleveland Indians traded CF Shin-Soo Choo and 3B Jason Donald to Cincinnati Reds for Didi Gregorius and RF Drew Stubbs. |
| Dec 11, 2012 | Trade | Bryan Shaw | Arizona Diamondbacks | Cleveland Guardians | Cleveland Indians traded 1B Lars Anderson, SS Didi Gregorius, SS Didi Gregorius and LHP Tony Sipp to Arizona Diamondbacks for RHP Matt Albers, RHP Trevor Bauer and RHP Bryan Shaw. |
| Dec 11, 2012 | Signed as free agent | Logan Kensing | — | Colorado Rockies | Colorado Rockies signed free agent RHP Logan Kensing to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Sean O'Sullivan | — | San Diego Padres | San Diego Padres signed free agent RHP Sean O'Sullivan to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Virgil Vasquez | — | Minnesota Twins | Minnesota Twins signed free agent RHP Virgil Vasquez to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Clete Thomas | — | Minnesota Twins | Minnesota Twins signed free agent RF Clete Thomas to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Greg Smith | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Greg Smith to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Buddy Carlyle | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Buddy Carlyle to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Kevin Dultz | — | Baltimore Orioles | Baltimore Orioles signed free agent C Kevin Dultz to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Yeiper Castillo | — | Athletics | Oakland Athletics signed free agent Yeiper Castillo. |
| Dec 11, 2012 | Signed as free agent | Matt Lachappa | — | San Diego Padres | San Diego Padres signed free agent LHP Matt Lachappa to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Chorye Spoone | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Chorye Spoone to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Neivy Pilier | — | Washington Nationals | Washington Nationals signed free agent 3B Neivy Pilier to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Matt Zaleski | — | Chicago White Sox | Chicago White Sox signed free agent RHP Matt Zaleski to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Andy González | — | Chicago White Sox | Chicago White Sox signed free agent SS Andy Gonzalez to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Brad Nelson | — | Chicago Cubs | Chicago Cubs signed free agent 1B Brad Nelson to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Brad Allen | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Brad Allen to a minor league contract. |
| Dec 11, 2012 | Signed as free agent | Mark Reed | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent C Mark Reed to a minor league contract and invited him to spring training. |
| Dec 11, 2012 | Signed as free agent | Buddy Carlyle | — | Toronto Blue Jays | Toronto Blue Jays signed free agent Buddy Carlyle. |
| Dec 11, 2012 | Signed as free agent | Buddy Carlyle | — | Toronto Blue Jays | Toronto Blue Jays signed free agent Buddy Carlyle. |
| Dec 11, 2012 | Signed as free agent | Joseph Miranda | — | Philadelphia Phillies | Philadelphia Phillies signed free agent OF Joseph Miranda to a minor league contract. |
| Dec 10, 2012 | Signed as free agent | Brayan Peña | — | Detroit Tigers | Detroit Tigers signed free agent C Brayan Pena. |
| Dec 10, 2012 | Signed as free agent | Jeff Keppinger | — | Chicago White Sox | Chicago White Sox signed free agent 2B Jeff Keppinger. |
| Dec 10, 2012 | Signed as free agent | Ryan Ludwick | — | Cincinnati Reds | Cincinnati Reds signed free agent LF Ryan Ludwick. |
| Dec 10, 2012 | Signed as free agent | Zack Greinke | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Zack Greinke. |
| Dec 10, 2012 | Signed as free agent | Juan Pablo Oramas | — | San Diego Padres | San Diego Padres signed free agent LHP Juan Pablo Oramas to a minor league contract. |
| Dec 10, 2012 | Signed as free agent | Ryan Sadowski | — | San Francisco Giants | San Francisco Giants signed free agent RHP Ryan Sadowski to a minor league contract and invited him to spring training. |
| Dec 10, 2012 | Signed as free agent | Jon Meloan | — | San Francisco Giants | San Francisco Giants signed free agent RHP Jon Meloan to a minor league contract. |
| Dec 10, 2012 | Signed as free agent | Josh Wilson | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent SS Josh Wilson to a minor league contract and invited him to spring training. |
| Dec 10, 2012 | Signed as free agent | Steve Garrison | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent LHP Steve Garrison to a minor league contract. |
| Dec 10, 2012 | Signed as free agent | Amaury Rivas | — | Miami Marlins | Miami Marlins signed free agent RHP Amaury Rivas to a minor league contract. |
| Dec 10, 2012 | Signed as free agent | Jonathan Albaladejo | — | Miami Marlins | Miami Marlins signed free agent RHP Jonathan Albaladejo to a minor league contract and invited him to spring training. |
| Dec 10, 2012 | Signed as free agent | Ed Lucas | — | Miami Marlins | Miami Marlins signed free agent 3B Ed Lucas to a minor league contract and invited him to spring training. |
| Dec 10, 2012 | Signed as free agent | Wilson Valdez | — | San Francisco Giants | San Francisco Giants signed free agent SS Wilson Valdez to a minor league contract and invited him to spring training. |
| Dec 10, 2012 | Signed as free agent | Juan Hernandez | — | Boston Red Sox | Boston Red Sox signed free agent LF Juan Hernandez to a minor league contract. |
| Dec 10, 2012 | Signed as free agent | David Oca | — | St. Louis Cardinals | St. Louis Cardinals signed free agent LHP David Oca to a minor league contract. |
| Dec 9, 2012 | Trade | Lisalverto Bonilla | Philadelphia Phillies | Texas Rangers | Texas Rangers traded 3B Michael Young to Philadelphia Phillies for RHP Josh Lindblom and RHP Lisalverto Bonilla. |
| Dec 9, 2012 | Signed as free agent | Hyun Jin Ryu | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LHP Hyun-Jin Ryu. |
| Dec 9, 2012 | Trade | Wil Myers | Kansas City Royals | Tampa Bay Rays | Tampa Bay Rays traded RHP James Shields, RHP Wade Davis and Player To Be Named Later to Kansas City Royals for LHP Mike Montgomery, RHP Jake Odorizzi, 3B Patrick Leonard and RF Wil Myers. |
| Dec 9, 2012 | Signed as free agent | Shane Loux | — | San Francisco Giants | San Francisco Giants signed free agent RHP Shane Loux to a minor league contract and invited him to spring training. |
| Dec 9, 2012 | Signed as free agent | Michael O'Connor | — | Minnesota Twins | Minnesota Twins signed free agent LHP Michael O'Connor to a minor league contract. |
| Dec 9, 2012 | Signed as free agent | Ray Olmedo | — | Minnesota Twins | Minnesota Twins signed free agent 3B Ray Olmedo to a minor league contract and invited him to spring training. |
| Dec 8, 2012 | Signed as free agent | Eric Chavez | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent 3B Eric Chavez. |
| Dec 8, 2012 | Signed as free agent | Jason Bay | — | Seattle Mariners | Seattle Mariners signed free agent RF Jason Bay. |
| Dec 8, 2012 | Signed as free agent | Ruben Sierra | — | Chicago White Sox | Chicago White Sox signed free agent OF Ruben Sierra to a minor league contract. |
| Dec 7, 2012 | Signed as free agent | Randy Choate | — | St. Louis Cardinals | St. Louis Cardinals signed free agent LHP Randy Choate. |
| Dec 7, 2012 | Signed as free agent | Kyuji Fujikawa | — | Chicago Cubs | Chicago Cubs signed free agent RHP Kyuji Fujikawa. |
| Dec 7, 2012 | Trade | Graham Godfrey | Athletics | Boston Red Sox | Oakland Athletics traded RHP Graham Godfrey to Boston Red Sox. |
| Dec 7, 2012 | Signed as free agent | Dan Haren | — | Washington Nationals | Washington Nationals signed free agent RHP Dan Haren. |
| Dec 7, 2012 | Signed as free agent | Travis Webb | — | Milwaukee Brewers | Milwaukee Brewers signed free agent LHP Travis Webb to a minor league contract and invited him to spring training. |
| Dec 7, 2012 | Signed as free agent | George Sherrill | — | Kansas City Royals | Kansas City Royals signed free agent LHP George Sherrill to a minor league contract and invited him to spring training. |
| Dec 7, 2012 | Signed as free agent | Ángel Pagán | — | San Francisco Giants | San Francisco Giants signed free agent CF Angel Pagan. |
| Dec 7, 2012 | Signed as free agent | Bryan Augenstein | — | Minnesota Twins | Minnesota Twins signed free agent RHP Bryan Augenstein to a minor league contract and invited him to spring training. |
| Dec 7, 2012 | Signed as free agent | Brandon Boggs | — | Minnesota Twins | Minnesota Twins signed free agent LF Brandon Boggs to a minor league contract and invited him to spring training. |
| Dec 7, 2012 | Signed as free agent | Reynaldo Rodriguez | — | Minnesota Twins | Minnesota Twins signed free agent 1B Reynaldo Rodriguez to a minor league contract. |
| Dec 7, 2012 | Signed as free agent | Chad Gaudin | — | San Francisco Giants | San Francisco Giants signed free agent RHP Chad Gaudin to a minor league contract and invited him to spring training. |
| Dec 7, 2012 | Signed as free agent | Javier Herrera | — | San Francisco Giants | San Francisco Giants signed free agent OF Javier Herrera to a minor league contract. |
| Dec 7, 2012 | Signed as free agent | Jensen Lewis | — | Chicago Cubs | Chicago Cubs signed free agent RHP Jensen Lewis to a minor league contract and invited him to spring training. |
| Dec 7, 2012 | Signed as free agent | Robinson Lopez | — | Atlanta Braves | Atlanta Braves signed free agent RHP Robinson Lopez to a minor league contract. |
| Dec 7, 2012 | Signed as free agent | Jonathan Diaz | — | Boston Red Sox | Boston Red Sox signed free agent SS Jonathan Diaz to a minor league contract and invited him to spring training. |
| Dec 7, 2012 | Signed as free agent | Joucer Martinez | — | Texas Rangers | Texas Rangers signed free agent RHP Joucer Martinez to a minor league contract. |
| Dec 7, 2012 | Signed as free agent | Tyler Herron | — | Washington Nationals | Washington Nationals signed free agent RHP Tyler Herron to a minor league contract. |
| Dec 7, 2012 | Signed as free agent | Paterson Segura | — | Washington Nationals | Washington Nationals signed free agent RHP Paterson Segura to a minor league contract. |
| Dec 7, 2012 | Signed as free agent | Francis Castro | — | Washington Nationals | Washington Nationals signed free agent LHP Francis Castro to a minor league contract. |
| Dec 7, 2012 | Signed as free agent | Tim Byrdak | — | New York Mets | New York Mets signed free agent LHP Tim Byrdak to a minor league contract and invited him to spring training. |
| Dec 7, 2012 | Signed as free agent | Angel Castro | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Angel Castro to a minor league contract. |
| Dec 6, 2012 | Trade | Wilfredo Boscan | Texas Rangers | San Diego Padres | Texas Rangers traded RHP Wilfredo Boscan to San Diego Padres. |
| Dec 6, 2012 | Signed as free agent | Brandon Allen | — | Texas Rangers | Texas Rangers signed free agent 1B Brandon Allen to a minor league contract and invited him to spring training. |
| Dec 6, 2012 | Signed as free agent | Jake Brigham | — | Texas Rangers | Texas Rangers signed free agent RHP Jake Brigham to a minor league contract and invited him to spring training. |
| Dec 6, 2012 | Signed as free agent | Evan Meek | — | Texas Rangers | Texas Rangers signed free agent RHP Evan Meek to a minor league contract and invited him to spring training. |
| Dec 6, 2012 | Signed as free agent | Randy Wells | — | Texas Rangers | Texas Rangers signed free agent RHP Randy Wells to a minor league contract and invited him to spring training. |
| Dec 6, 2012 | Trade | Vance Worley | Philadelphia Phillies | Minnesota Twins | Minnesota Twins traded CF Ben Revere to Philadelphia Phillies for RHP Trevor May and RHP Vance Worley. |
| Dec 6, 2012 | Trade | Justin Henry | Detroit Tigers | Boston Red Sox | Boston Red Sox traded 2B Jeff Kobernus to Detroit Tigers for LF Justin Henry. |
| Dec 6, 2012 | Trade | Kyle Lobstein | New York Mets | Detroit Tigers | New York Mets traded LHP Kyle Lobstein to Detroit Tigers for cash. |
| Dec 6, 2012 | Trade | Kyle Kaminska | Pittsburgh Pirates | Boston Red Sox | Pittsburgh Pirates traded RHP Kyle Kaminska to Boston Red Sox. |
| Dec 6, 2012 | Signed as free agent | Reed Johnson | — | Atlanta Braves | Atlanta Braves signed free agent RF Reed Johnson. |
| Dec 6, 2012 | Signed as free agent | James Loney | — | Tampa Bay Rays | Tampa Bay Rays signed free agent 1B James Loney. |
| Dec 6, 2012 | Signed as free agent | Wil Nieves | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent C Wil Nieves. |
| Dec 6, 2012 | Signed as free agent | Eric Hinske | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent 1B Eric Hinske. |
| Dec 6, 2012 | Signed as free agent | Zach Duke | — | Washington Nationals | Washington Nationals signed free agent LHP Zach Duke. |
| Dec 6, 2012 | Signed as free agent | Miguel Hernandez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Miguel Hernandez to a minor league contract. |
| Dec 6, 2012 | Signed as free agent | Luis Liberato | — | Seattle Mariners | Seattle Mariners signed free agent OF Luis Liberato to a minor league contract. |
| Dec 5, 2012 | Trade | Andy Oliver | Detroit Tigers | Pittsburgh Pirates | Pittsburgh Pirates traded C Ramon Cabrera to Detroit Tigers for LHP Andy Oliver. |
| Dec 5, 2012 | Signed as free agent | Adam Russell | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Adam Russell to a minor league contract and invited him to spring training. |
| Dec 5, 2012 | Signed as free agent | Conor Jackson | — | Baltimore Orioles | Baltimore Orioles signed free agent RF Conor Jackson to a minor league contract and invited him to spring training. |
| Dec 5, 2012 | Signed as free agent | Allan de San Miguel | — | Baltimore Orioles | Baltimore Orioles signed free agent C Allan de San Miguel to a minor league contract and invited him to spring training. |
| Dec 5, 2012 | Signed as free agent | Jose Gil | — | Baltimore Orioles | Baltimore Orioles signed free agent C Jose Gil to a minor league contract and invited him to spring training. |
| Dec 5, 2012 | Signed as free agent | Chris Robinson | — | Baltimore Orioles | Baltimore Orioles signed free agent C Chris Robinson to a minor league contract and invited him to spring training. |
| Dec 5, 2012 | Signed as free agent | Jan Novak | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Jan Novak to a minor league contract. |
| Dec 5, 2012 | Signed as free agent | Cesar Jimenez | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LHP Cesar Jimenez to a minor league contract and invited him to spring training. |
| Dec 5, 2012 | Signed as free agent | Ariel Sandoval | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent OF Ariel Sandoval to a minor league contract. |
| Dec 5, 2012 | Signed as free agent | Edduin Aray | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Edduin Aray to a minor league contract. |
| Dec 5, 2012 | Signed as free agent | Roimar Guarecuco | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Roimar Guarecuco to a minor league contract. |
| Dec 4, 2012 | Signed as free agent | Joakim Soria | — | Texas Rangers | Texas Rangers signed free agent RHP Joakim Soria. |
| Dec 4, 2012 | Signed as free agent | Chih-Hsien Chiang | — | Texas Rangers | Texas Rangers signed free agent RF Chih-Hsien Chiang to a minor league contract. |
| Dec 4, 2012 | Trade | Yunel Escobar | Miami Marlins | Tampa Bay Rays | Miami Marlins traded SS Yunel Escobar to Tampa Bay Rays for 2B Derek Dietrich. |
| Dec 4, 2012 | Signed as free agent | Marco Scutaro | — | San Francisco Giants | San Francisco Giants signed free agent 2B Marco Scutaro. |
| Dec 4, 2012 | Trade | Alex Gillingham | Colorado Rockies | Houston Astros | Houston Astros traded RHP Wilton Lopez and Player To Be Named Later to Colorado Rockies for RHP Alex White and RHP Alex Gillingham. |
| Dec 4, 2012 | Signed as free agent | Anthony Carter | — | Boston Red Sox | Boston Red Sox signed free agent RHP Anthony Carter to a minor league contract and invited him to spring training. |
| Dec 4, 2012 | Signed as free agent | Matt Pagnozzi | — | Atlanta Braves | Atlanta Braves signed free agent C Matt Pagnozzi to a minor league contract and invited him to spring training. |
| Dec 4, 2012 | Signed as free agent | José Yépez | — | Atlanta Braves | Atlanta Braves signed free agent C Jose Yepez to a minor league contract and invited him to spring training. |
| Dec 4, 2012 | Signed as free agent | Shawn Roof | — | Baltimore Orioles | Baltimore Orioles signed free agent 2B Shawn Roof to a minor league contract. |
| Dec 4, 2012 | Signed as free agent | Lester Oliveros | — | Minnesota Twins | Minnesota Twins signed free agent RHP Lester Oliveros to a minor league contract and invited him to spring training. |
| Dec 4, 2012 | Signed as free agent | Yonardo Herdenez | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Yonardo Herdenez to a minor league contract. |
| Dec 4, 2012 | Signed as free agent | Manuel Rondon | — | Los Angeles Angels | Los Angeles Angels signed free agent LHP Manuel Rondon to a minor league contract. |
| Dec 3, 2012 | Signed as free agent | Jason Marquis | — | San Diego Padres | San Diego Padres signed free agent RHP Jason Marquis. |
| Dec 3, 2012 | Signed as free agent | Geovany Soto | — | Texas Rangers | Texas Rangers signed free agent C Geovany Soto. |
| Dec 3, 2012 | Signed as free agent | Humberto Quintero | — | Philadelphia Phillies | Philadelphia Phillies signed free agent C Humberto Quintero to a minor league contract and invited him to spring training. |
| Dec 3, 2012 | Signed as free agent | Jordan Brown | — | Miami Marlins | Miami Marlins signed free agent LF Jordan Brown to a minor league contract and invited him to spring training. |
| Dec 3, 2012 | Signed as free agent | Chris Jakubauskas | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Chris Jakubauskas to a minor league contract. |
| Dec 3, 2012 | Signed as free agent | Alex Reyes | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Alexander Reyes to a minor league contract. |
| Dec 3, 2012 | Signed as free agent | José Rodríguez | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Jose Rodriguez to a minor league contract. |
| Dec 3, 2012 | Signed as free agent | Jhon Nuñez | — | Boston Red Sox | Boston Red Sox signed free agent C Jhon Nunez to a minor league contract. |
| Dec 2, 2012 | Signed as free agent | Roberto Caro | — | Chicago Cubs | Chicago Cubs signed free agent OF Roberto Caro to a minor league contract. |
| Dec 2, 2012 | Signed as free agent | Hainley Statia | — | Milwaukee Brewers | Milwaukee Brewers signed free agent SS Hainley Statia to a minor league contract. |
| Dec 1, 2012 | Signed as free agent | Jonny Gomes | — | Boston Red Sox | Boston Red Sox signed free agent LF Jonny Gomes. |
| Dec 1, 2012 | Signed as free agent | Mike Zagurski | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent LHP Mike Zagurski to a minor league contract and invited him to spring training. |
| Dec 1, 2012 | Trade | Burke Badenhop | Tampa Bay Rays | Milwaukee Brewers | Tampa Bay Rays traded RHP Burke Badenhop to Milwaukee Brewers for OF Raul Mondesi, Jr.. |
| Dec 1, 2012 | Signed as free agent | Blake DeWitt | — | Atlanta Braves | Atlanta Braves signed free agent 2B Blake DeWitt to a minor league contract and invited him to spring training. |
| Dec 1, 2012 | Signed as free agent | Zach Miner | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Zach Miner to a minor league contract and invited him to spring training. |
| Nov 30, 2012 | Signed as free agent | Fernando Nieve | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Fernando Nieve to a minor league contract and invited him to spring training. |
| Nov 30, 2012 | Trade | Jordan Walden | Los Angeles Angels | Atlanta Braves | Los Angeles Angels traded RHP Jordan Walden to Atlanta Braves for RHP Tommy Hanson. |
| Nov 30, 2012 | Signed as free agent | Russell Martin | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent C Russell Martin. |
| Nov 30, 2012 | Signed as free agent | Mariano Rivera | — | New York Yankees | New York Yankees signed free agent RHP Mariano Rivera. |
| Nov 30, 2012 | Trade | Zack Thornton | Athletics | Pittsburgh Pirates | Pittsburgh Pirates traded RHP Chris Resop to Oakland Athletics for RHP Zack Thornton. |
| Nov 30, 2012 | Trade | Jhondaniel Medina | Baltimore Orioles | Pittsburgh Pirates | Pittsburgh Pirates traded 3B Yamaico Navarro to Baltimore Orioles for RHP Jhondaniel Medina. |
| Nov 30, 2012 | Signed as free agent | Kota Kobayashi | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Kota Kobayashi to a minor league contract. |
| Nov 30, 2012 | Signed as free agent | Johnni Turbo | — | Athletics | Oakland Athletics signed free agent LF D'Arby Myers to a minor league contract. |
| Nov 30, 2012 | Signed as free agent | Alberto Guzman | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Alberto Guzman to a minor league contract. |
| Nov 30, 2012 | Signed as free agent | Wilfri Aleton | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Wilfri Aleton to a minor league contract. |
| Nov 30, 2012 | Signed as free agent | Orbandy Rodriguez | — | Chicago Cubs | Chicago Cubs signed free agent RHP Orbandy Rodriguez to a minor league contract. |
| Nov 30, 2012 | Signed as free agent | Yeison Medina | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Yeison Medina to a minor league contract. |
| Nov 29, 2012 | Signed as free agent | Rich Thompson | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Rich Thompson to a minor league contract and invited him to spring training. |
| Nov 29, 2012 | Signed as free agent | Mike Fontenot | — | Tampa Bay Rays | Tampa Bay Rays signed free agent 2B Mike Fontenot to a minor league contract and invited him to spring training. |
| Nov 29, 2012 | Signed as free agent | Will Inman | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Will Inman to a minor league contract and invited him to spring training. |
| Nov 29, 2012 | Signed as free agent | Nick Weglarz | — | Tampa Bay Rays | Tampa Bay Rays signed free agent LF Nick Weglarz to a minor league contract and invited him to spring training. |
| Nov 29, 2012 | Signed as free agent | B.J. Upton | — | Atlanta Braves | Atlanta Braves signed free agent CF B.J. Upton. |
| Nov 29, 2012 | Signed as free agent | Scott Moore | — | Athletics | Oakland Athletics signed free agent 3B Scott Moore to a minor league contract and invited him to spring training. |
| Nov 29, 2012 | Trade | Alex Meyer | Washington Nationals | Minnesota Twins | Minnesota Twins traded CF Denard Span to Washington Nationals for RHP Alex Meyer. |
| Nov 29, 2012 | Signed as free agent | Jason Bourgeois | — | Tampa Bay Rays | Tampa Bay Rays signed free agent CF Jason Bourgeois to a minor league contract and invited him to spring training. |
| Nov 29, 2012 | Signed as free agent | David Herndon | — | New York Yankees | New York Yankees signed free agent RHP David Herndon to a minor league contract and invited him to spring training. |
| Nov 29, 2012 | Signed as free agent | Oscar Villarreal | — | Boston Red Sox | Boston Red Sox signed free agent RHP Oscar Villarreal to a minor league contract and invited him to spring training. |
| Nov 29, 2012 | Signed | Kungkuan Giljegiljaw | — | Cleveland Guardians | Cleveland Indians signed C Li-Jen Chu. |
| Nov 28, 2012 | Signed as free agent | Sam Holland | — | San Diego Padres | San Diego Padres signed free agent RHP Samuel Holland to a minor league contract. |
| Nov 28, 2012 | Signed as free agent | Jeremy Gould | — | San Diego Padres | San Diego Padres signed free agent Jeremy Gould. |
| Nov 28, 2012 | Signed as free agent | Euri Minaya | — | San Diego Padres | San Diego Padres signed free agent OF Euri Minaya to a minor league contract. |
| Nov 28, 2012 | Signed as free agent | Luis Ugueto | — | San Diego Padres | San Diego Padres signed free agent SS Luis Ugueto to a minor league contract. |
| Nov 28, 2012 | Signed as free agent | Travis Buck | — | San Diego Padres | San Diego Padres signed free agent LF Travis Buck to a minor league contract and invited him to spring training. |
| Nov 28, 2012 | Signed as free agent | Daniel Stange | — | San Diego Padres | San Diego Padres signed free agent RHP Daniel Stange to a minor league contract and invited him to spring training. |
| Nov 28, 2012 | Trade | Zach Stewart | Boston Red Sox | Pittsburgh Pirates | Boston Red Sox traded RHP Zach Stewart to Pittsburgh Pirates. |
| Nov 28, 2012 | Trade | Clint Robinson | Kansas City Royals | Pittsburgh Pirates | Kansas City Royals traded 1B Clint Robinson and RHP Vin Mazzaro to Pittsburgh Pirates for Luis Rico, RHP Luis Santos and RHP Luis Santos. |
| Nov 28, 2012 | Trade | Cory Burns | San Diego Padres | Texas Rangers | San Diego Padres traded RHP Cory Burns to Texas Rangers. |
| Nov 28, 2012 | Trade | Sandy Rosario | Boston Red Sox | Athletics | Boston Red Sox traded RHP Sandy Rosario to Oakland Athletics. |
| Nov 28, 2012 | Trade | Danny Valencia | Boston Red Sox | Baltimore Orioles | Boston Red Sox traded 3B Danny Valencia to Baltimore Orioles. |
| Nov 28, 2012 | Signed as free agent | Yangervis Solarte | — | Texas Rangers | Texas Rangers signed free agent 2B Yangervis Solarte to a minor league contract and invited him to spring training. |
| Nov 28, 2012 | Signed as free agent | Collin Balester | — | Texas Rangers | Texas Rangers signed free agent RHP Collin Balester to a minor league contract and invited him to spring training. |
| Nov 28, 2012 | Signed as free agent | Andy Pettitte | — | New York Yankees | New York Yankees signed free agent LHP Andy Pettitte. |
| Nov 28, 2012 | Released | Chone Figgins | — | Seattle Mariners | Seattle Mariners released LF Chone Figgins. |
| Nov 28, 2012 | Signed as free agent | Ryan Madson | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Ryan Madson. |
| Nov 28, 2012 | Signed as free agent | Jonathan Broxton | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Jonathan Broxton. |
| Nov 28, 2012 | Released | Brad Bergesen | — | Arizona Diamondbacks | Arizona Diamondbacks released RHP Brad Bergesen. |
| Nov 28, 2012 | Signed as free agent | Jason Lane | — | Minnesota Twins | Minnesota Twins signed free agent LHP Jason Lane to a minor league contract. |
| Nov 28, 2012 | Signed as free agent | Bill Bray | — | Washington Nationals | Washington Nationals signed free agent LHP Bill Bray to a minor league contract and invited him to spring training. |
| Nov 28, 2012 | Signed as free agent | James Vahalik | — | Baltimore Orioles | Baltimore Orioles signed free agent C James Vahalik to a minor league contract. |
| Nov 28, 2012 | Signed as free agent | Buddy Sosnoskie | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Buddy Sosnoskie to a minor league contract. |
| Nov 28, 2012 | Signed as free agent | Alberto Rosario | — | Boston Red Sox | Boston Red Sox signed free agent C Alberto Rosario to a minor league contract. |
| Nov 28, 2012 | Signed as free agent | Carlos Teller | — | San Francisco Giants | San Francisco Giants signed free agent LHP Carlos Teller to a minor league contract. |
| Nov 28, 2012 | Signed as free agent | Tim Corcoran | — | Atlanta Braves | Atlanta Braves signed free agent RHP Tim Corcoran to a minor league contract. |
| Nov 28, 2012 | Signed as free agent | Tyler Claburn | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Tyler Claburn to a minor league contract. |
| Nov 27, 2012 | Signed as free agent | Scott Feldman | — | Chicago Cubs | Chicago Cubs signed free agent Scott Feldman. |
| Nov 27, 2012 | Signed as free agent | Philippe Valiquette | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent Philippe Valiquette. |
| Nov 26, 2012 | Trade | Brandon Hicks | Athletics | New York Mets | Oakland Athletics traded SS Brandon Hicks to New York Mets. |
| Nov 26, 2012 | Signed as free agent | Trevor Bell | — | Detroit Tigers | Detroit Tigers signed free agent RHP Trevor Bell to a minor league contract and invited him to spring training. |
| Nov 26, 2012 | Signed as free agent | John Lindsey | — | Detroit Tigers | Detroit Tigers signed free agent 1B John Lindsey to a minor league contract. |
| Nov 26, 2012 | Signed as free agent | Kevin Russo | — | Detroit Tigers | Detroit Tigers signed free agent 2B Kevin Russo to a minor league contract and invited him to spring training. |
| Nov 26, 2012 | Signed as free agent | Matt Tuiasosopo | — | Detroit Tigers | Detroit Tigers signed free agent 3B Matt Tuiasosopo to a minor league contract and invited him to spring training. |
| Nov 26, 2012 | Signed as free agent | Lee Hyde | — | Cincinnati Reds | Cincinnati Reds signed free agent LHP Lee Hyde to a minor league contract. |
| Nov 26, 2012 | Signed as free agent | Justin Christian | — | St. Louis Cardinals | St. Louis Cardinals signed free agent LF Justin Christian to a minor league contract and invited him to spring training. |
| Nov 26, 2012 | Signed as free agent | Bobby Bramhall | — | Washington Nationals | Washington Nationals signed free agent LHP Bobby Bramhall to a minor league contract. |
| Nov 25, 2012 | Signed as free agent | Zach Phillips | — | Miami Marlins | Miami Marlins signed free agent LHP Zach Phillips to a minor league contract and invited him to spring training. |
| Nov 24, 2012 | Signed as free agent | Mark Teahen | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent 3B Mark Teahen to a minor league contract and invited him to spring training. |
| Nov 24, 2012 | Signed as free agent | Shawn Hill | — | Detroit Tigers | Detroit Tigers signed free agent RHP Shawn Hill to a minor league contract and invited him to spring training. |
| Nov 23, 2012 | Signed as free agent | Trevor Reckling | — | Chicago White Sox | Chicago White Sox signed free agent LHP Trevor Reckling to a minor league contract. |
| Nov 23, 2012 | Signed as free agent | Cyle Hankerd | — | Chicago White Sox | Chicago White Sox signed free agent OF Cyle Hankerd to a minor league contract. |
| Nov 23, 2012 | Signed as free agent | Robert Coe | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Robert Coe to a minor league contract. |
| Nov 23, 2012 | Signed as free agent | Chris Cox | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Chris Cox to a minor league contract. |
| Nov 23, 2012 | Signed as free agent | Ryan Stovall | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent 3B Ryan Stovall to a minor league contract. |
| Nov 22, 2012 | Signed as free agent | Osman Manzanares | — | Atlanta Braves | Atlanta Braves signed free agent RHP Osman Manzanares to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Brooks Brown | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Brooks Brown to a minor league contract and invited him to spring training. |
| Nov 21, 2012 | Signed as free agent | Erik Cordier | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Erik Cordier to a minor league contract and invited him to spring training. |
| Nov 21, 2012 | Signed as free agent | Felix Pie | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent LF Felix Pie to a minor league contract and invited him to spring training. |
| Nov 21, 2012 | Signed as free agent | David Bromberg | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP David Bromberg to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Luis Angel Sanz | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Luis Angel Sanz to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Alex Valdez | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 3B Alex Valdez to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Dewayne Wise | — | Chicago White Sox | Chicago White Sox signed free agent CF Dewayne Wise. |
| Nov 21, 2012 | Signed as free agent | Ricardo Nanita | — | Toronto Blue Jays | Toronto Blue Jays signed free agent OF Ricardo Nanita to a minor league contract and invited him to spring training. |
| Nov 21, 2012 | Signed as free agent | Alex Hinshaw | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Alex Hinshaw to a minor league contract and invited him to spring training. |
| Nov 21, 2012 | Released | Bryan LaHair | — | Chicago Cubs | Chicago Cubs released 1B Bryan LaHair. |
| Nov 21, 2012 | Signed as free agent | Jose G. Valdez | — | Houston Astros | Houston Astros signed free agent RHP Jose Valdez to a minor league contract and invited him to spring training. |
| Nov 21, 2012 | Signed as free agent | Brandon Hynick | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Brandon Hynick to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Reinier Roll | — | Atlanta Braves | Atlanta Braves signed free agent RHP Reinier Roll to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Tyler LaTorre | — | San Francisco Giants | San Francisco Giants signed free agent C Tyler LaTorre to a minor league contract and invited him to spring training. |
| Nov 21, 2012 | Signed as free agent | Wanel Vasquez | — | New York Mets | New York Mets signed free agent RHP Wanel Mesa to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Walter Ibarra | — | New York Yankees | New York Yankees signed free agent SS Walter Ibarra to a minor league contract and invited him to spring training. |
| Nov 21, 2012 | Signed as free agent | Rauly Castillo | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Rauly Castillo to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Dalton Rodriguez | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Daniel Rodriguez to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Tyler Henson | — | Philadelphia Phillies | Philadelphia Phillies signed free agent OF Tyler Henson to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Oswaldo Castillo | — | Detroit Tigers | Detroit Tigers signed free agent RHP Oswaldo Castillo to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Edubray Ramos | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Edubray Ramos to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Willians Moreno | — | Detroit Tigers | Detroit Tigers signed free agent RHP Willians Moreno to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Mario Sanjur | — | Detroit Tigers | Detroit Tigers signed free agent C Mario Sanjur to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Adrian Alfaro | — | Detroit Tigers | Detroit Tigers signed free agent SS Adrian Alfaro to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Dilinyer Flores | — | Detroit Tigers | Detroit Tigers signed free agent OF Dilinyer Flores to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Ariel Serrano | — | Detroit Tigers | Detroit Tigers signed free agent OF Ariel Serrano to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Kevin Gadea | — | Seattle Mariners | Seattle Mariners signed free agent RHP Kevin Gadea to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Carlos Ledezma | — | Atlanta Braves | Atlanta Braves signed free agent RHP Carlos Ledezma to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Aldo Silva | — | Atlanta Braves | Atlanta Braves signed free agent RHP Aldo Silva to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Carlos Martínez | — | Atlanta Braves | Atlanta Braves signed free agent C Carlos Martinez to a minor league contract. |
| Nov 21, 2012 | Signed as free agent | Juan Puello | — | Atlanta Braves | Atlanta Braves signed free agent OF Juan Puello to a minor league contract. |
| Nov 20, 2012 | Signed as free agent | Jeremy Guthrie | — | Kansas City Royals | Kansas City Royals signed free agent RHP Jeremy Guthrie. |
| Nov 20, 2012 | Trade | Robert Andino | Baltimore Orioles | Seattle Mariners | Baltimore Orioles traded 2B Robert Andino to Seattle Mariners for LF Trayvon Robinson. |
| Nov 20, 2012 | Released | Ryan Raburn | — | Detroit Tigers | Detroit Tigers released 2B Ryan Raburn. |
| Nov 20, 2012 | Signed as free agent | Jim Negrych | — | Toronto Blue Jays | Toronto Blue Jays signed free agent 2B Jim Negrych to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Trade | Ryan Wheeler | Arizona Diamondbacks | Colorado Rockies | Arizona Diamondbacks traded 3B Ryan Wheeler to Colorado Rockies for LHP Matt Reynolds. |
| Nov 20, 2012 | Signed as free agent | Tim Wood | — | Minnesota Twins | Minnesota Twins signed free agent RHP Tim Wood. |
| Nov 20, 2012 | Signed as free agent | Tom Boleska | — | Minnesota Twins | Minnesota Twins signed free agent RHP Tom Boleska to a minor league contract. |
| Nov 20, 2012 | Signed as free agent | Samuel Deduno | — | Minnesota Twins | Minnesota Twins signed free agent RHP Samuel Deduno to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Signed as free agent | P.J. Walters | — | Minnesota Twins | Minnesota Twins signed free agent RHP P.J. Walters to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Trade | Barret Loux | Texas Rangers | Chicago Cubs | Chicago Cubs traded RHP Jake Brigham to Texas Rangers for RHP Barret Loux and Player To Be Named Later. |
| Nov 20, 2012 | Signed as free agent | Johan Yan | — | Texas Rangers | Texas Rangers signed free agent RHP Johan Yan to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Signed as free agent | Hiroki Kuroda | — | New York Yankees | New York Yankees signed free agent RHP Hiroki Kuroda. |
| Nov 20, 2012 | Signed as free agent | Matt Young | — | Los Angeles Angels | Los Angeles Angels signed free agent LF Matt Young to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Signed as free agent | Édgar González | — | Houston Astros | Houston Astros signed free agent RHP Edgar Gonzalez to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Signed as free agent | Guillermo Quiroz | — | San Francisco Giants | San Francisco Giants signed free agent C Guillermo Quiroz to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Signed as free agent | Brandon Erbe | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Brandon Erbe to a minor league contract. |
| Nov 20, 2012 | Signed as free agent | Shane Dyer | — | Detroit Tigers | Detroit Tigers signed free agent RHP Shane Dyer to a minor league contract. |
| Nov 20, 2012 | Signed as free agent | Jess Todd | — | Detroit Tigers | Detroit Tigers signed free agent RHP Jess Todd to a minor league contract. |
| Nov 20, 2012 | Signed as free agent | Trevor Crowe | — | Houston Astros | Houston Astros signed free agent LF Trevor Crowe to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Signed as free agent | Sergio Escalona | — | Houston Astros | Houston Astros signed free agent LHP Sergio Escalona to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Signed as free agent | Jumbo Diaz | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Jose Diaz to a minor league contract. |
| Nov 20, 2012 | Signed as free agent | Wilkin De La Rosa | — | Cincinnati Reds | Cincinnati Reds signed free agent LHP Wilkin De La Rosa to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Signed as free agent | Darwin Polanco | — | Kansas City Royals | Kansas City Royals signed free agent RHP Darwin Polanco to a minor league contract. |
| Nov 20, 2012 | Signed as free agent | Jose Jimenez | — | Kansas City Royals | Kansas City Royals signed free agent LHP Jose Jimenez to a minor league contract. |
| Nov 20, 2012 | Signed as free agent | Luis Valenzuela | — | Kansas City Royals | Kansas City Royals signed free agent SS Luis Valenzuela to a minor league contract. |
| Nov 20, 2012 | Signed as free agent | Jeff Clement | — | Minnesota Twins | Minnesota Twins signed free agent 1B Jeff Clement to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Signed as free agent | Kyler Newby | — | Athletics | Oakland Athletics signed free agent RHP Kyler Newby to a minor league contract and invited him to spring training. |
| Nov 20, 2012 | Signed as free agent | Carlos Herrera | — | Kansas City Royals | Kansas City Royals signed free agent LHP Carlos Herrera to a minor league contract. |
| Nov 20, 2012 | Signed as free agent | Anyelo Gómez | — | New York Yankees | New York Yankees signed free agent RHP Anyelo Gomez to a minor league contract. |
| Nov 19, 2012 | Signed as free agent | Shawn Camp | — | Chicago Cubs | Chicago Cubs signed free agent RHP Shawn Camp. |
| Nov 19, 2012 | Signed as free agent | Matt Carson | — | Cleveland Guardians | Cleveland Indians signed free agent RF Matt Carson to a minor league contract and invited him to spring training. |
| Nov 19, 2012 | Signed as free agent | Cedric Hunter | — | Cleveland Guardians | Cleveland Indians signed free agent CF Cedric Hunter to a minor league contract and invited him to spring training. |
| Nov 19, 2012 | Signed as free agent | Juan Pierre | — | Miami Marlins | Miami Marlins signed free agent LF Juan Pierre. |
| Nov 19, 2012 | Trade | Yunel Escobar | Toronto Blue Jays | Miami Marlins | Miami Marlins traded 2B Emilio Bonifacio, C John Buck, LHP Mark Buehrle, RHP Josh Johnson and SS Jose Reyes to Toronto Blue Jays for RHP Henderson Alvarez, SS Yunel Escobar, SS Adeiny Hechavarria, C Jeff Mathis, RHP Anthony DeSclafani, CF Jake Marisnick and LHP Justin Nicolino. |
| Nov 19, 2012 | Signed as free agent | Melky Cabrera | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LF Melky Cabrera. |
| Nov 19, 2012 | Released | Brandon Dickson | — | St. Louis Cardinals | St. Louis Cardinals released RHP Brandon Dickson. |
| Nov 19, 2012 | Signed as free agent | Fernando Abad | — | Washington Nationals | Washington Nationals signed free agent LHP Fernando Abad to a minor league contract and invited him to spring training. |
| Nov 19, 2012 | Signed as free agent | Jeff Stevens | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Jeff Stevens to a minor league contract. |
| Nov 19, 2012 | Signed as free agent | Nevin Ashley | — | Cincinnati Reds | Cincinnati Reds signed free agent C Nevin Ashley to a minor league contract and invited him to spring training. |
| Nov 19, 2012 | Signed as free agent | Nick Evans | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent 1B Nick Evans to a minor league contract and invited him to spring training. |
| Nov 19, 2012 | Signed as free agent | Darwin Perez | — | Athletics | Oakland Athletics signed free agent SS Darwin Perez to a minor league contract and invited him to spring training. |
| Nov 19, 2012 | Signed as free agent | Willy Lebron | — | San Francisco Giants | San Francisco Giants signed free agent RHP Willy Lebron to a minor league contract. |
| Nov 19, 2012 | Signed as free agent | Julio Izturis | — | Toronto Blue Jays | Toronto Blue Jays signed free agent 2B Julio Izturis to a minor league contract. |
| Nov 19, 2012 | Signed as free agent | Joel Peralta | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Joel Peralta. |
| Nov 19, 2012 | Signed as free agent | Randy Consuegra | — | Washington Nationals | Washington Nationals signed free agent Randy Consuegra. |
| Nov 19, 2012 | Signed as free agent | Michael De La Cruz | — | Toronto Blue Jays | Toronto Blue Jays signed free agent C Michael De La Cruz to a minor league contract. |
| Nov 19, 2012 | Signed as free agent | Félix Bautista | — | Miami Marlins | Miami Marlins signed free agent RHP Felix Bautista to a minor league contract. |
| Nov 19, 2012 | Signed as free agent | Emmanuel Ramirez | — | San Diego Padres | San Diego Padres signed free agent RHP Emmanuel Ramirez to a minor league contract. |
| Nov 18, 2012 | Signed as free agent | Jamie Hoffmann | — | New York Mets | New York Mets signed free agent RF Jamie Hoffmann to a minor league contract and invited him to spring training. |
| Nov 17, 2012 | Signed as free agent | Kila Ka'aihue | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent 1B Kila Ka'aihue to a minor league contract and invited him to spring training. |
| Nov 17, 2012 | Signed as free agent | Jeff Manship | — | Colorado Rockies | Colorado Rockies signed free agent RHP Jeff Manship to a minor league contract and invited him to spring training. |
| Nov 17, 2012 | Signed as free agent | Jose A. Flores | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Jose Flores to a minor league contract. |
| Nov 16, 2012 | Signed as free agent | Dioner Navarro | — | Chicago Cubs | Chicago Cubs signed free agent C Dioner Navarro. |
| Nov 16, 2012 | Trade | A.J. Kirby-Jones | Athletics | San Diego Padres | Oakland Athletics traded Tyson Ross and A.J. Kirby-Jones to San Diego Padres for Andy Parrino and Andrew Werner. |
| Nov 16, 2012 | Signed as free agent | Torii Hunter | — | Detroit Tigers | Detroit Tigers signed free agent RF Torii Hunter. |
| Nov 16, 2012 | Signed as free agent | Gerald Laird | — | Atlanta Braves | Atlanta Braves signed free agent C Gerald Laird. |
| Nov 16, 2012 | Signed as free agent | Brian Sanches | — | Kansas City Royals | Kansas City Royals signed free agent RHP Brian Sanches to a minor league contract and invited him to spring training. |
| Nov 16, 2012 | Signed as free agent | Atahualpa Severino | — | Kansas City Royals | Kansas City Royals signed free agent LHP Atahualpa Severino to a minor league contract and invited him to spring training. |
| Nov 16, 2012 | Signed as free agent | Brandon Wood | — | Kansas City Royals | Kansas City Royals signed free agent 3B Brandon Wood to a minor league contract and invited him to spring training. |
| Nov 16, 2012 | Signed as free agent | James Beresford | — | Minnesota Twins | Minnesota Twins signed free agent 2B James Beresford to a minor league contract and invited him to spring training. |
| Nov 16, 2012 | Signed as free agent | Gregory Infante | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Greg Infante to a minor league contract and invited him to spring training. |
| Nov 16, 2012 | Signed as free agent | Wilkin Castillo | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent C Wilkin Castillo to a minor league contract and invited him to spring training. |
| Nov 16, 2012 | Signed as free agent | Josh Fields | — | Philadelphia Phillies | Philadelphia Phillies signed free agent 3B Josh Fields to a minor league contract and invited him to spring training. |
| Nov 16, 2012 | Signed as free agent | Jonathan Santiago | — | Atlanta Braves | Atlanta Braves signed free agent RHP Jonathan Santiago to a minor league contract. |
| Nov 16, 2012 | Signed as free agent | Nate Spears | — | Cleveland Guardians | Cleveland Indians signed free agent 2B Nate Spears to a minor league contract and invited him to spring training. |
| Nov 16, 2012 | Signed as free agent | Scott Rice | — | New York Mets | New York Mets signed free agent LHP Scott Rice to a minor league contract and invited him to spring training. |
| Nov 16, 2012 | Signed as free agent | Luis Vasquez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Luis Vasquez to a minor league contract. |
| Nov 16, 2012 | Signed as free agent | Erlin Cerda | — | Cleveland Guardians | Cleveland Indians signed free agent 2B Erlin Cerda to a minor league contract. |
| Nov 15, 2012 | Signed as free agent | JB Shuck | — | Los Angeles Angels | Los Angeles Angels signed free agent CF J.B. Shuck to a minor league contract and invited him to spring training. |
| Nov 15, 2012 | Signed as free agent | Trent Oeltjen | — | Los Angeles Angels | Los Angeles Angels signed free agent LF Trent Oeltjen to a minor league contract and invited him to spring training. |
| Nov 15, 2012 | Signed as free agent | Frankie De La Cruz | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Frankie De La Cruz to a minor league contract. |
| Nov 15, 2012 | Signed as free agent | Neil Wagner | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Neil Wagner to a minor league contract and invited him to spring training. |
| Nov 15, 2012 | Signed as free agent | Caleb Clay | — | Washington Nationals | Washington Nationals signed free agent RHP Caleb Clay to a minor league contract. |
| Nov 15, 2012 | Signed as free agent | Brian Bixler | — | New York Mets | New York Mets signed free agent 2B Brian Bixler to a minor league contract and invited him to spring training. |
| Nov 15, 2012 | Signed as free agent | Justin Thomas | — | Athletics | Oakland Athletics signed free agent LHP Justin Thomas to a minor league contract and invited him to spring training. |
| Nov 15, 2012 | Signed as free agent | David Purcey | — | Chicago White Sox | Chicago White Sox signed free agent LHP David Purcey to a minor league contract and invited him to spring training. |
| Nov 15, 2012 | Signed as free agent | Ronald Uviedo | — | Toronto Blue Jays | Toronto Blue Jays signed free agent Ronald Uviedo. |
| Nov 15, 2012 | Signed as free agent | Brad Davis | — | Detroit Tigers | Detroit Tigers signed free agent C Brad Davis to a minor league contract and invited him to spring training. |
| Nov 15, 2012 | Signed as free agent | James Hoyt | — | Atlanta Braves | Atlanta Braves signed free agent RHP James Hoyt to a minor league contract. |
| Nov 15, 2012 | Signed as free agent | Dusty Hughes | — | Atlanta Braves | Atlanta Braves signed free agent LHP Dusty Hughes to a minor league contract and invited him to spring training. |
| Nov 15, 2012 | Signed as free agent | Steve Tolleson | — | Chicago White Sox | Chicago White Sox signed free agent 3B Steve Tolleson to a minor league contract and invited him to spring training. |
| Nov 15, 2012 | Signed as free agent | Thomas Melgarejo | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent Thomas Melgarejo. |
| Nov 15, 2012 | Signed as free agent | C.J. Retherford | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent 3B C.J. Retherford to a minor league contract. |
| Nov 15, 2012 | Signed as free agent | Zach Kroenke | — | Milwaukee Brewers | Milwaukee Brewers signed free agent LHP Zach Kroenke to a minor league contract. |
| Nov 15, 2012 | Signed as free agent | Carlos Torres | — | New York Mets | New York Mets signed free agent RHP Carlos Torres to a minor league contract and invited him to spring training. |
| Nov 15, 2012 | Signed as free agent | Willie Collazo | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Willie Collazo to a minor league contract. |
| Nov 15, 2012 | Signed as free agent | Dusty Hughes | — | Atlanta Braves | Atlanta Braves signed free agent Dusty Hughes. |
| Nov 14, 2012 | Signed as free agent | David Ross | — | Boston Red Sox | Boston Red Sox signed free agent C David Ross. |
| Nov 14, 2012 | Signed as free agent | Brendan Harris | — | Los Angeles Angels | Los Angeles Angels signed free agent 3B Brendan Harris to a minor league contract and invited him to spring training. |
| Nov 14, 2012 | Signed as free agent | Hector Correa | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent Hector Correa. |
| Nov 14, 2012 | Signed as free agent | Emmanuel Burriss | — | Cincinnati Reds | Cincinnati Reds signed free agent 2B Emmanuel Burriss to a minor league contract and invited him to spring training. |
| Nov 14, 2012 | Signed as free agent | Brian Bogusevic | — | Chicago Cubs | Chicago Cubs signed free agent LF Brian Bogusevic to a minor league contract and invited him to spring training. |
| Nov 14, 2012 | Signed as free agent | Fabio Castillo | — | San Francisco Giants | San Francisco Giants signed free agent RHP Fabio Castillo to a minor league contract and invited him to spring training. |
| Nov 14, 2012 | Signed as free agent | Matt Buschmann | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Matt Buschmann to a minor league contract and invited him to spring training. |
| Nov 14, 2012 | Signed as free agent | Rommie Lewis | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent LHP Rommie Lewis to a minor league contract and invited him to spring training. |
| Nov 14, 2012 | Signed as free agent | Shawn McGill | — | Atlanta Braves | Atlanta Braves signed free agent C Shawn McGill to a minor league contract. |
| Nov 14, 2012 | Signed as free agent | Daniel McCutchen | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Daniel McCutchen to a minor league contract and invited him to spring training. |
| Nov 14, 2012 | Signed as free agent | Dan Meyer | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Dan Meyer to a minor league contract. |
| Nov 14, 2012 | Signed as free agent | Lew Ford | — | Baltimore Orioles | Baltimore Orioles signed free agent LF Lew Ford to a minor league contract and invited him to spring training. |
| Nov 14, 2012 | Signed as free agent | J.C. Boscan | — | Chicago Cubs | Chicago Cubs signed free agent C J.C. Boscan to a minor league contract and invited him to spring training. |
| Nov 14, 2012 | Signed as free agent | Eric Hacker | — | San Francisco Giants | San Francisco Giants signed free agent RHP Eric Hacker to a minor league contract and invited him to spring training. |
| Nov 14, 2012 | Signed as free agent | Jesús Sucre | — | Seattle Mariners | Seattle Mariners signed free agent C Jesus Sucre to a minor league contract and invited him to spring training. |
| Nov 13, 2012 | Signed as free agent | Scott Baker | — | Chicago Cubs | Chicago Cubs signed free agent RHP Scott Baker. |
| Nov 13, 2012 | Signed as free agent | Rob Johnson | — | St. Louis Cardinals | St. Louis Cardinals signed free agent C Rob Johnson to a minor league contract and invited him to spring training. |
| Nov 13, 2012 | Released | Kyle McClellan | — | St. Louis Cardinals | St. Louis Cardinals released RHP Kyle McClellan. |
| Nov 13, 2012 | Signed as free agent | Jo-Jo Reyes | — | Los Angeles Angels | Los Angeles Angels signed free agent LHP Jo-Jo Reyes to a minor league contract and invited him to spring training. |
| Nov 13, 2012 | Signed as free agent | Billy Buckner | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Billy Buckner to a minor league contract and invited him to spring training. |
| Nov 13, 2012 | Signed as free agent | Luke Carlin | — | Los Angeles Angels | Los Angeles Angels signed free agent C Luke Carlin to a minor league contract and invited him to spring training. |
| Nov 13, 2012 | Signed as free agent | Mitch Stetter | — | Los Angeles Angels | Los Angeles Angels signed free agent LHP Mitch Stetter to a minor league contract and invited him to spring training. |
| Nov 13, 2012 | Signed as free agent | Kelvin De La Cruz | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LHP Kelvin De La Cruz to a minor league contract and invited him to spring training. |
| Nov 13, 2012 | Signed as free agent | Juan Abreu | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Juan Abreu to a minor league contract and invited him to spring training. |
| Nov 13, 2012 | Signed as free agent | Alberto Gonzalez | — | Chicago Cubs | Chicago Cubs signed free agent 2B Alberto Gonzalez to a minor league contract and invited him to spring training. |
| Nov 13, 2012 | Signed as free agent | Johermyn Chavez | — | Chicago Cubs | Chicago Cubs signed free agent RF Johermyn Chavez to a minor league contract and invited him to spring training. |
| Nov 13, 2012 | Signed as free agent | Miguel Rojas | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent SS Miguel Rojas to a minor league contract. |
| Nov 13, 2012 | Signed as free agent | Jose Sanchez | — | Kansas City Royals | Kansas City Royals signed free agent OF Jose Sanchez to a minor league contract. |
| Nov 12, 2012 | Signed as free agent | Juan Apodaca | — | Texas Rangers | Texas Rangers signed free agent C Juan Apodaca to a minor league contract and invited him to spring training. |
| Nov 12, 2012 | Signed as free agent | James Adduci | — | Texas Rangers | Texas Rangers signed free agent CF Jim Adduci to a minor league contract and invited him to spring training. |
| Nov 12, 2012 | Signed as free agent | Neal Cotts | — | Texas Rangers | Texas Rangers signed free agent LHP Neal Cotts to a minor league contract and invited him to spring training. |
| Nov 12, 2012 | Signed as free agent | Aaron Cunningham | — | Texas Rangers | Texas Rangers signed free agent RF Aaron Cunningham to a minor league contract and invited him to spring training. |
| Nov 12, 2012 | Signed as free agent | Yonata Ortega | — | Texas Rangers | Texas Rangers signed free agent RHP Yonata Ortega to a minor league contract and invited him to spring training. |
| Nov 12, 2012 | Signed as free agent | Zach Simons | — | Texas Rangers | Texas Rangers signed free agent RHP Zach Simons to a minor league contract. |
| Nov 12, 2012 | Signed as free agent | Mike Hessman | — | Cincinnati Reds | Cincinnati Reds signed free agent 3B Mike Hessman to a minor league contract. |
| Nov 12, 2012 | Signed as free agent | Ramon Troncoso | — | Chicago White Sox | Chicago White Sox signed free agent RHP Ramon Troncoso to a minor league contract and invited him to spring training. |
| Nov 12, 2012 | Signed as free agent | Scott Olsen | — | Texas Rangers | Texas Rangers signed free agent LHP Scott Olsen to a minor league contract. |
| Nov 12, 2012 | Signed as free agent | Ramon Troncoso | — | Chicago White Sox | Chicago White Sox signed free agent Ramon Troncoso. |
| Nov 12, 2012 | Signed as free agent | Jason Christian | — | Minnesota Twins | Minnesota Twins signed free agent 3B Jason Christian to a minor league contract. |
| Nov 12, 2012 | Signed as free agent | Bobby Korecky | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Bobby Korecky to a minor league contract. |
| Nov 11, 2012 | Signed as free agent | Bryan Anderson | — | Chicago White Sox | Chicago White Sox signed free agent C Bryan Anderson to a minor league contract and invited him to spring training. |
| Nov 11, 2012 | Signed as free agent | John Shelby | — | Chicago White Sox | Chicago White Sox signed free agent CF John Shelby to a minor league contract. |
| Nov 10, 2012 | Signed as free agent | Eric Fryer | — | Minnesota Twins | Minnesota Twins signed free agent C Eric Fryer to a minor league contract and invited him to spring training. |
| Nov 9, 2012 | Signed as free agent | Justin Germano | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Justin Germano to a minor league contract and invited him to spring training. |
| Nov 9, 2012 | Signed as free agent | Luis Durango | — | Kansas City Royals | Kansas City Royals signed free agent LF Luis Durango to a minor league contract and invited him to spring training. |
| Nov 9, 2012 | Signed as free agent | Ian Gac | — | Kansas City Royals | Kansas City Royals signed free agent 1B Ian Gac to a minor league contract. |
| Nov 9, 2012 | Signed as free agent | Ryan Reid | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Ryan Reid to a minor league contract and invited him to spring training. |
| Nov 9, 2012 | Signed as free agent | Jared Goedert | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 3B Jared Goedert to a minor league contract and invited him to spring training. |
| Nov 9, 2012 | Signed as free agent | Jeff Larish | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 1B Jeff Larish to a minor league contract. |
| Nov 9, 2012 | Signed as free agent | Luke Montz | — | Athletics | Oakland Athletics signed free agent C Luke Montz to a minor league contract and invited him to spring training. |
| Nov 8, 2012 | Signed as free agent | Maicer Izturis | — | Toronto Blue Jays | Toronto Blue Jays signed free agent 3B Maicer Izturis. |
| Nov 8, 2012 | Trade | Jeremy Jeffress | Kansas City Royals | Toronto Blue Jays | Kansas City Royals traded RHP Jeremy Jeffress to Toronto Blue Jays. |
| Nov 8, 2012 | Trade | Tommy Hottovy | Kansas City Royals | Texas Rangers | Kansas City Royals traded LHP Tommy Hottovy to Texas Rangers for cash and Player To Be Named Later. |
| Nov 8, 2012 | Signed as free agent | Héctor Rondón | — | Cleveland Guardians | Cleveland Indians signed free agent Hector Rondon. |
| Nov 8, 2012 | Signed as free agent | Jose Alvarez | — | Detroit Tigers | Detroit Tigers signed free agent LHP Jose Alvarez to a minor league contract and invited him to spring training. |
| Nov 8, 2012 | Signed as free agent | Yefri Pena | — | Washington Nationals | Washington Nationals signed free agent RHP Yefri Pena to a minor league contract. |
| Nov 8, 2012 | Signed as free agent | Leudys Baez | — | Washington Nationals | Washington Nationals signed free agent SS Leudys Baez to a minor league contract. |
| Nov 8, 2012 | Signed as free agent | Luis De La Cruz | — | Atlanta Braves | Atlanta Braves signed free agent C Luis De La Cruz to a minor league contract and invited him to spring training. |
| Nov 7, 2012 | Released | Jason Bay | — | New York Mets | New York Mets released LF Jason Bay. |
| Nov 7, 2012 | Signed as free agent | Greg Burke | — | New York Mets | New York Mets signed free agent RHP Greg Burke to a minor league contract and invited him to spring training. |
| Nov 7, 2012 | Trade | Blake Tekotte | San Diego Padres | Chicago White Sox | San Diego Padres traded CF Blake Tekotte to Chicago White Sox for RHP Brandon Kloess. |
| Nov 7, 2012 | Signed as free agent | Unnamed | — | Atlanta Braves | Atlanta Braves signed free agent RHP Wilmi Francisco to a minor league contract. |
| Nov 7, 2012 | Signed as free agent | Will Rhymes | — | Washington Nationals | Washington Nationals signed free agent 2B Will Rhymes to a minor league contract and invited him to spring training. |
| Nov 7, 2012 | Signed as free agent | Raymond Kruml | — | Washington Nationals | Washington Nationals signed free agent OF Raymond Kruml to a minor league contract. |
| Nov 7, 2012 | Signed as free agent | Blake Parker | — | Chicago Cubs | Chicago Cubs signed free agent RHP Blake Parker to a minor league contract and invited him to spring training. |
| Nov 7, 2012 | Signed as free agent | Mike Nickeas | — | New York Mets | New York Mets signed free agent Mike Nickeas. |
| Nov 7, 2012 | Signed | Victor Delgado | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Victor Delgado. |
| Nov 7, 2012 | Signed | Reiwal Gonzalez | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Reiwal Gonzalez. |
| Nov 7, 2012 | Signed | Alexis Rivero | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Alexis Rivero. |
| Nov 6, 2012 | Signed as free agent | Darren Ford | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent CF Darren Ford to a minor league contract and invited him to spring training. |
| Nov 6, 2012 | Signed as free agent | Omar Javier | — | San Francisco Giants | San Francisco Giants signed free agent RHP Omar Javier to a minor league contract. |
| Nov 5, 2012 | Signed as free agent | David Ortiz | — | Boston Red Sox | Boston Red Sox signed free agent DH David Ortiz. |
| Nov 5, 2012 | Signed as free agent | Jairo Asencio | — | Milwaukee Brewers | Milwaukee Brewers signed free agent Jairo Asencio. |
| Nov 5, 2012 | Signed as free agent | Luis Hernandez | — | Cleveland Guardians | Cleveland Indians signed free agent 3B Luis Hernandez to a minor league contract and invited him to spring training. |
| Nov 5, 2012 | Signed as free agent | Jordan Smith | — | Miami Marlins | Miami Marlins signed free agent RHP Jordan Smith to a minor league contract and invited him to spring training. |
| Nov 5, 2012 | Signed as free agent | Chris Valaika | — | Miami Marlins | Miami Marlins signed free agent 3B Chris Valaika to a minor league contract and invited him to spring training. |
| Nov 5, 2012 | Signed as free agent | Eddie Bonine | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Eddie Bonine to a minor league contract and invited him to spring training. |
| Nov 5, 2012 | Signed as free agent | Kevin Kouzmanoff | — | Miami Marlins | Miami Marlins signed free agent 3B Kevin Kouzmanoff to a minor league contract and invited him to spring training. |
| Nov 5, 2012 | Signed as free agent | Wirfin Obispo | — | Atlanta Braves | Atlanta Braves signed free agent RHP Wirfin Obispo to a minor league contract and invited him to spring training. |
| Nov 3, 2012 | Trade | Yan Gomes | Toronto Blue Jays | Cleveland Guardians | Cleveland Indians traded RHP Esmil Rogers to Toronto Blue Jays for LF Mike Aviles and C Yan Gomes. |
| Nov 3, 2012 | Signed as free agent | Oliver Pérez | — | Seattle Mariners | Seattle Mariners signed free agent LHP Oliver Perez. |
| Nov 3, 2012 | Signed as free agent | Bartolo Colon | — | Athletics | Oakland Athletics signed free agent RHP Bartolo Colon. |
| Nov 3, 2012 | Signed as free agent | Michael Olmsted | — | Milwaukee Brewers | Milwaukee Brewers signed free agent Michael Olmsted. |
| Nov 3, 2012 | Signed as free agent | Ofreidy Gómez | — | Kansas City Royals | Kansas City Royals signed free agent RHP Ofreidy Gomez to a minor league contract. |
| Nov 2, 2012 | Signed as free agent | Drew Sutton | — | Boston Red Sox | Boston Red Sox signed free agent 3B Drew Sutton to a minor league contract and invited him to spring training. |
| Nov 2, 2012 | Signed | Nick Hutchings | — | Pittsburgh Pirates | Pittsburgh Pirates signed RHP Nick Hutchings. |
| Nov 2, 2012 | Signed as free agent | Alberto Sanchez | — | Miami Marlins | Miami Marlins signed free agent 3B Alberto Sanchez to a minor league contract. |
| Nov 2, 2012 | Signed as free agent | Francis Martes | — | Miami Marlins | Miami Marlins signed free agent RHP Francis Martes to a minor league contract. |
| Nov 1, 2012 | Signed as free agent | Wyatt Toregas | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent Wyatt Toregas. |
| Nov 1, 2012 | Signed as free agent | Anthony Ortega | — | Kansas City Royals | Kansas City Royals signed free agent RHP Anthony Ortega to a minor league contract. |
| Oct 31, 2012 | Trade | Ervin Santana | Los Angeles Angels | Kansas City Royals | Los Angeles Angels traded RHP Ervin Santana and cash to Kansas City Royals for LHP Brandon Sisk. |
| Oct 31, 2012 | Signed as free agent | Mitch Maier | — | Boston Red Sox | Boston Red Sox signed free agent CF Mitch Maier to a minor league contract and invited him to spring training. |
| Oct 31, 2012 | Signed as free agent | Edwin Maysonet | — | Chicago Cubs | Chicago Cubs signed free agent SS Edwin Maysonet to a minor league contract and invited him to spring training. |
| Oct 31, 2012 | Signed as free agent | Omar Carrizales | — | Colorado Rockies | Colorado Rockies signed free agent OF Omar Carrizales to a minor league contract. |
| Oct 30, 2012 | Signed as free agent | Raymond Sanchez | — | Atlanta Braves | Atlanta Braves signed free agent RHP Raymond Sanchez to a minor league contract. |
| Oct 29, 2012 | Released | Hisanori Takahashi | — | Pittsburgh Pirates | Pittsburgh Pirates released LHP Hisanori Takahashi. |
| Oct 29, 2012 | Signed as free agent | Darinel Rodriguez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent SS Darinel Rodriguez to a minor league contract. |
| Oct 26, 2012 | Released | Takashi Saito | — | Arizona Diamondbacks | Arizona Diamondbacks released RHP Takashi Saito. |
| Oct 26, 2012 | Signed as free agent | Jason Pridie | — | Baltimore Orioles | Baltimore Orioles signed free agent CF Jason Pridie to a minor league contract and invited him to spring training. |
| Oct 25, 2012 | Signed as free agent | Angel Sanchez | — | Los Angeles Angels | Los Angeles Angels signed free agent Angel Sanchez. |
| Oct 24, 2012 | Released | Munenori Kawasaki | — | Seattle Mariners | Seattle Mariners released SS Munenori Kawasaki. |
| Oct 24, 2012 | Signed as free agent | Garrett Olson | — | Athletics | Oakland Athletics signed free agent LHP Garrett Olson to a minor league contract and invited him to spring training. |
| Oct 24, 2012 | Signed as free agent | Jeremy Reed | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent LF Jeremy Reed to a minor league contract and invited him to spring training. |
| Oct 23, 2012 | Released | Micah Owings | — | San Diego Padres | San Diego Padres released RHP Micah Owings. |
| Oct 23, 2012 | Signed as free agent | Enneider Torres | — | Tampa Bay Rays | Tampa Bay Rays signed free agent SS Enneider Torres to a minor league contract. |
| Oct 21, 2012 | Trade | David Carpenter | Toronto Blue Jays | Boston Red Sox | Toronto Blue Jays traded RHP David Carpenter to Boston Red Sox for SS Mike Aviles. |
| Oct 21, 2012 | Signed as free agent | José Azócar | — | Detroit Tigers | Detroit Tigers signed free agent OF Jose Azocar to a minor league contract. |
| Oct 20, 2012 | Trade | Unnamed | Athletics | Arizona Diamondbacks | Arizona Diamondbacks traded CF Chris Young to Oakland Athletics for SS Cliff Pennington, Yordy Cabrera and Yordy Cabrera. |
| Oct 20, 2012 | Trade | Heath Bell | Miami Marlins | Arizona Diamondbacks | Miami Marlins traded RHP Heath Bell to Arizona Diamondbacks for SS Yordy Cabrera. |
| Oct 19, 2012 | Signed as free agent | Ariel Venegas | — | Kansas City Royals | Kansas City Royals signed free agent 2B Ariel Venegas to a minor league contract. |
| Oct 18, 2012 | Signed as free agent | Devon Lowery | — | Kansas City Royals | Kansas City Royals signed free agent RHP Devon Lowery to a minor league contract. |
| Oct 18, 2012 | Signed as free agent | Max Ramirez | — | Kansas City Royals | Kansas City Royals signed free agent C Max Ramirez to a minor league contract and invited him to spring training. |
| Oct 18, 2012 | Signed as free agent | Matt Fields | — | Kansas City Royals | Kansas City Royals signed free agent 1B Matt Fields to a minor league contract. |
| Oct 18, 2012 | Signed as free agent | Nick Van Stratten | — | Kansas City Royals | Kansas City Royals signed free agent OF Nick Van Stratten to a minor league contract. |
| Oct 18, 2012 | Signed as free agent | Juan Gutierrez | — | Kansas City Royals | Kansas City Royals signed free agent Juan Gutierrez. |
| Oct 18, 2012 | Signed as free agent | Heri Quevedo | — | Boston Red Sox | Boston Red Sox signed free agent RHP Heri Quevedo to a minor league contract. |
| Oct 17, 2012 | Signed as free agent | Victor Acosta | — | Boston Red Sox | Boston Red Sox signed free agent SS Victor Acosta to a minor league contract. |
| Oct 17, 2012 | Signed as free agent | Daniel Gonzalez | — | Boston Red Sox | Boston Red Sox signed free agent RHP Daniel Gonzalez to a minor league contract. |
| Oct 17, 2012 | Signed as free agent | Junior Garcia | — | Houston Astros | Houston Astros signed free agent LHP Junior Garcia to a minor league contract. |
| Oct 17, 2012 | Signed as free agent | Brock Mansion | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Brock Mansion to a minor league contract. |
| Oct 16, 2012 | Trade | Marcelo Carreno | Detroit Tigers | Chicago Cubs | Detroit Tigers traded RHP Marcelo Carreno to Chicago Cubs. |
| Oct 15, 2012 | Signed as free agent | Angel Moreno | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Angel Moreno to a minor league contract. |
| Oct 14, 2012 | Signed as free agent | Dean Bell | — | Toronto Blue Jays | Toronto Blue Jays signed free agent 2B Dean Bell to a minor league contract. |
| Oct 12, 2012 | Signed as free agent | Eucebio Arias | — | New York Mets | New York Mets signed free agent RHP Eucebio Arias to a minor league contract. |
| Oct 12, 2012 | Signed as free agent | Werner Leal | — | Texas Rangers | Texas Rangers signed free agent RHP Werner Leal to a minor league contract. |
| Oct 12, 2012 | Signed as free agent | Kevin Mendoza | — | Texas Rangers | Texas Rangers signed free agent C Kevin Mendoza to a minor league contract. |
| Oct 11, 2012 | Signed as free agent | Danny Canellas | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent C Daniel Canellas to a minor league contract. |
| Oct 10, 2012 | Signed as free agent | George Barber | — | Baltimore Orioles | Baltimore Orioles signed free agent OF George Barber to a minor league contract. |
| Oct 9, 2012 | Signed as free agent | Pedro Flores | — | Baltimore Orioles | Baltimore Orioles signed free agent SS Pedro Flores to a minor league contract. |
| Oct 5, 2012 | Released | Matt Bush | — | Tampa Bay Rays | Tampa Bay Rays released RHP Matt Bush. |
| Oct 5, 2012 | Signed | Jose Morales | — | Washington Nationals | Washington Nationals signed RHP Jose Morales. |
| Oct 5, 2012 | Signed as free agent | Gerson Moreno | — | Detroit Tigers | Detroit Tigers signed free agent RHP Gerson Moreno to a minor league contract. |
| Oct 4, 2012 | Trade | Rubby De La Rosa | Los Angeles Dodgers | Boston Red Sox | Los Angeles Dodgers traded RHP Rubby De La Rosa and LF Jerry Sands to Boston Red Sox. |
| Oct 4, 2012 | Signed as free agent | Raybell Mella | — | Tampa Bay Rays | Tampa Bay Rays signed free agent SS Raybell Mella to a minor league contract. |
| Oct 3, 2012 | Released | Adam Greenberg | — | Miami Marlins | Miami Marlins released CF Adam Greenberg. |
| Oct 2, 2012 | Signed as free agent | Adam Greenberg | — | Miami Marlins | Miami Marlins signed free agent CF Adam Greenberg. |
| Oct 2, 2012 | Signed as free agent | Jesus Rodriguez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent LHP Jesus Rodriguez to a minor league contract. |
| Oct 2, 2012 | Signed as free agent | Pabel Manzanero | — | Cincinnati Reds | Cincinnati Reds signed free agent C Pabel Manzanero to a minor league contract. |
| Oct 1, 2012 | Signed | Anthony Rodriguez | — | Philadelphia Phillies | Philadelphia Phillies signed C Anthony Rodriguez. |
| Oct 1, 2012 | Signed as free agent | Brallan Perez | — | Texas Rangers | Texas Rangers signed free agent SS Brallan Perez to a minor league contract. |
| Oct 1, 2012 | Signed as free agent | Oscar De La Cruz | — | Chicago Cubs | Chicago Cubs signed free agent RHP Oscar De La Cruz to a minor league contract. |
| Sep 28, 2012 | Trade | Stefan Jarrin | Los Angeles Dodgers | Philadelphia Phillies | Los Angeles Dodgers traded 2B Stefan Jarrin to Philadelphia Phillies. |
| Sep 27, 2012 | Signed as free agent | Jean Ramirez | — | New York Yankees | New York Yankees signed free agent RHP Jean Ramirez to a minor league contract. |
| Sep 27, 2012 | Signed as free agent | Raynel Espinal | — | New York Yankees | New York Yankees signed free agent RHP Raynel Espinal to a minor league contract. |
| Sep 25, 2012 | Trade | Greg Ross | Atlanta Braves | Detroit Tigers | Atlanta Braves traded RHP Greg Ross to Detroit Tigers. |
| Sep 25, 2012 | Signed as free agent | Micah Kellogg | — | Detroit Tigers | Detroit Tigers signed free agent RHP Micah Kellogg to a minor league contract. |
| Sep 24, 2012 | Signed as free agent | Abel Mora | — | New York Yankees | New York Yankees signed free agent LHP Abel Mora to a minor league contract. |
| Sep 23, 2012 | Signed | Kyle Schepel | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Kyle Schepel. |
| Sep 21, 2012 | Trade | Yorvit Torrealba | Toronto Blue Jays | Milwaukee Brewers | Toronto Blue Jays traded C Yorvit Torrealba to Milwaukee Brewers for cash. |
| Sep 21, 2012 | Signed as free agent | Luis Gonzalez | — | Cincinnati Reds | Cincinnati Reds signed free agent SS Luis Gonzalez to a minor league contract. |
| Sep 21, 2012 | Signed as free agent | Jose Siri | — | Cincinnati Reds | Cincinnati Reds signed free agent CF Jose Siri to a minor league contract. |
| Sep 20, 2012 | Trade | Theron Geith | Tampa Bay Rays | Houston Astros | Tampa Bay Rays traded LHP Theron Geith to Houston Astros. |
| Sep 20, 2012 | Released | Cole Gillespie | — | Arizona Diamondbacks | Arizona Diamondbacks released LF Cole Gillespie. |
| Sep 20, 2012 | Signed as free agent | Jesus Atencio | — | Kansas City Royals | Kansas City Royals signed free agent C Jesus Atencio to a minor league contract. |
| Sep 18, 2012 | Signed as free agent | Pedro Silverio | — | Chicago Cubs | Chicago Cubs signed free agent RHP Pedro Silverio to a minor league contract. |
| Sep 18, 2012 | Signed as free agent | Carlos Diaz | — | Kansas City Royals | Kansas City Royals signed free agent SS Carlos Diaz to a minor league contract. |
| Sep 18, 2012 | Signed as free agent | Jose Martinez | — | Kansas City Royals | Kansas City Royals signed free agent SS Jose Martinez to a minor league contract. |
| Sep 18, 2012 | Signed as free agent | Arnaldo Hernandez | — | Kansas City Royals | Kansas City Royals signed free agent RHP Arnaldo Hernandez to a minor league contract. |
| Sep 17, 2012 | Signed as free agent | Jorge Parra | — | Minnesota Twins | Minnesota Twins signed free agent LF Jorge Parra to a minor league contract. |
| Sep 17, 2012 | Signed as free agent | Alexis Tapia | — | Minnesota Twins | Minnesota Twins signed free agent Alexis Tapia. |
| Sep 17, 2012 | Signed as free agent | Gerson Garabito | — | Kansas City Royals | Kansas City Royals signed free agent RHP Gerson Garabito to a minor league contract. |
| Sep 16, 2012 | Signed as free agent | Carlos Monasterios | — | Detroit Tigers | Detroit Tigers signed free agent RHP Carlos Monasterios to a minor league contract. |
| Sep 15, 2012 | Signed as free agent | Miguel Medrano | — | Kansas City Royals | Kansas City Royals signed free agent RHP Miguel Medrano to a minor league contract. |
| Sep 15, 2012 | Signed as free agent | Juliandry Higuera | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Juliandry Higuera to a minor league contract. |
| Sep 14, 2012 | Released | Kevin Gregg | — | Baltimore Orioles | Baltimore Orioles released RHP Kevin Gregg. |
| Sep 14, 2012 | Signed as free agent | Michael Joseph | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Michael Joseph to a minor league contract. |
| Sep 13, 2012 | Signed as free agent | Jonathan Loáisiga | — | San Francisco Giants | San Francisco Giants signed free agent RHP Jonathan Loaisiga to a minor league contract. |
| Sep 12, 2012 | Signed as free agent | Derian González | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Derian Gonzalez to a minor league contract. |
| Sep 11, 2012 | Signed as free agent | Luis Dominguez | — | Toronto Blue Jays | Toronto Blue Jays signed free agent C Luis Dominguez to a minor league contract. |
| Sep 11, 2012 | Signed as free agent | Robert Antunez | — | San Francisco Giants | San Francisco Giants signed free agent 2B Robert Antunez to a minor league contract. |
| Sep 11, 2012 | Signed as free agent | Johan Cruz | — | Chicago White Sox | Chicago White Sox signed free agent SS Johan Cruz to a minor league contract. |
| Sep 11, 2012 | Signed as free agent | Luis Ysla | — | San Francisco Giants | San Francisco Giants signed free agent LHP Luis Ysla to a minor league contract. |
| Sep 10, 2012 | Released | Francisco Cordero | — | Houston Astros | Houston Astros released RHP Francisco Cordero. |
| Sep 10, 2012 | Signed as free agent | Jesus Trinidad | — | Tampa Bay Rays | Tampa Bay Rays signed free agent C Jesus Trinidad to a minor league contract. |
| Sep 10, 2012 | Signed as free agent | Herminio Germoso | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Herminio Germoso to a minor league contract. |
| Sep 10, 2012 | Signed as free agent | Jet Hernandez | — | Minnesota Twins | Minnesota Twins signed free agent RF Jet Hernandez to a minor league contract. |
| Sep 10, 2012 | Signed as free agent | Johan Quezada | — | Minnesota Twins | Minnesota Twins signed free agent RHP Johan Quezada to a minor league contract. |
| Sep 10, 2012 | Signed as free agent | Joel Ramirez | — | Minnesota Twins | Minnesota Twins signed free agent SS Joel Ramirez to a minor league contract. |
| Sep 10, 2012 | Signed as free agent | Johson Rosado | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Johson Rosado to a minor league contract. |
| Sep 7, 2012 | Signed as free agent | Carlos Sanchez | — | New York Mets | New York Mets signed free agent C Carlos Sanchez to a minor league contract. |
| Sep 6, 2012 | Released | Miguel De Los Santos | — | Texas Rangers | Texas Rangers released Miguel De Los Santos. |
| Sep 6, 2012 | Signed as free agent | Patricio Guillen | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Patricio Guillen to a minor league contract. |
| Sep 6, 2012 | Signed as free agent | Algenis Martinez | — | Boston Red Sox | Boston Red Sox signed free agent RHP Algenis Martinez to a minor league contract. |
| Sep 4, 2012 | Signed | Jordan Steranka | — | Pittsburgh Pirates | Pittsburgh Pirates signed 3B Jordan Steranka. |
| Sep 4, 2012 | Signed as free agent | Joel Diaz | — | Colorado Rockies | Colorado Rockies signed free agent C Joel Diaz to a minor league contract. |
| Sep 4, 2012 | Signed as free agent | Juremi Profar | — | Texas Rangers | Texas Rangers signed free agent SS Juremi Profar to a minor league contract. |
| Sep 2, 2012 | Signed | Lorenzo Barcelo | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP Lorenzo Barcelo. |
| Sep 2, 2012 | Signed | Natanael Delgado | — | Los Angeles Angels | Los Angeles Angels signed Natanael Delgado. |
| Sep 1, 2012 | Signed as free agent | Chris McMurray | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent C Chris McMurray to a minor league contract. |
| Aug 31, 2012 | Signed as free agent | Randy Wolf | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Randy Wolf. |
| Aug 31, 2012 | Released | Jack Wilson | — | Atlanta Braves | Atlanta Braves released SS Jack Wilson. |
| Aug 31, 2012 | Signed as free agent | Hector Luna | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 1B Hector Luna to a minor league contract. |
| Aug 31, 2012 | Trade | Jeff Baker | Detroit Tigers | Atlanta Braves | Detroit Tigers traded 1B Jeff Baker to Atlanta Braves for cash. |
| Aug 31, 2012 | Trade | Ben Francisco | Houston Astros | Tampa Bay Rays | Houston Astros traded LF Ben Francisco to Tampa Bay Rays for Player To Be Named Later. |
| Aug 30, 2012 | Released | Gregory Infante | — | Chicago White Sox | Chicago White Sox released RHP Greg Infante. |
| Aug 28, 2012 | Released | Erik Bedard | — | Pittsburgh Pirates | Pittsburgh Pirates released LHP Erik Bedard. |
| Aug 28, 2012 | Released | Jeremy Hermida | — | San Diego Padres | San Diego Padres released RF Jeremy Hermida. |
| Aug 28, 2012 | Signed as free agent | Edwin Lora | — | Washington Nationals | Washington Nationals signed free agent SS Edwin Lora to a minor league contract. |
| Aug 27, 2012 | Trade | Steve Pearce | Houston Astros | New York Yankees | Houston Astros traded 1B Steve Pearce to New York Yankees for cash. |
| Aug 27, 2012 | Trade | Blake Lalli | Chicago Cubs | Athletics | Oakland Athletics traded C Anthony Recker to Chicago Cubs for C Blake Lalli. |
| Aug 27, 2012 | Signed as free agent | Michael Zouzalik | — | Texas Rangers | Texas Rangers signed free agent RHP Michael Zouzalik to a minor league contract. |
| Aug 27, 2012 | Signed as free agent | Amadeo Zazueta | — | Toronto Blue Jays | Toronto Blue Jays signed free agent SS Amadeo Zazueta to a minor league contract. |
| Aug 26, 2012 | Trade | Joe Saunders | Arizona Diamondbacks | Baltimore Orioles | Arizona Diamondbacks traded cash and LHP Joe Saunders to Baltimore Orioles for Player To Be Named Later and RHP Matt Lindstrom. |
| Aug 26, 2012 | Signed as free agent | Geoff Brown | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LHP Geoff Brown to a minor league contract. |
| Aug 26, 2012 | Signed as free agent | Luis Alexander Basabe | — | Boston Red Sox | Boston Red Sox signed free agent OF Luis Alexander Basabe to a minor league contract. |
| Aug 26, 2012 | Signed as free agent | Luis Alejandro Basabe | — | Boston Red Sox | Boston Red Sox signed free agent 2B Luis Alejandro Basabe to a minor league contract. |
| Aug 25, 2012 | Trade | Allen Webster | Los Angeles Dodgers | Boston Red Sox | Boston Red Sox traded 1B Adrian Gonzalez, LF Carl Crawford, RHP Josh Beckett and SS Nick Punto to Los Angeles Dodgers for 1B James Loney, 2B Ivan De Jesus Jr. and RHP Allen Webster. |
| Aug 24, 2012 | Trade | Jesse Chavez | Toronto Blue Jays | Athletics | Toronto Blue Jays traded RHP Jesse Chavez to Oakland Athletics for cash. |
| Aug 24, 2012 | Signed as free agent | Tim Corcoran | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Tim Corcoran to a minor league contract. |
| Aug 24, 2012 | Signed as free agent | Jesus Zambrano | — | Athletics | Oakland Athletics signed free agent RHP Jesus Zambrano to a minor league contract. |
| Aug 23, 2012 | Released | Juan Cruz | — | Pittsburgh Pirates | Pittsburgh Pirates released RHP Juan Cruz. |
| Aug 23, 2012 | Signed as free agent | Édgar González | — | Houston Astros | Houston Astros signed free agent RHP Edgar Gonzalez to a minor league contract. |
| Aug 23, 2012 | Signed as free agent | Sam Lewis | — | Kansas City Royals | Kansas City Royals signed free agent RHP Sam Lewis to a minor league contract. |
| Aug 22, 2012 | Released | Randy Wolf | — | Milwaukee Brewers | Milwaukee Brewers released LHP Randy Wolf. |
| Aug 22, 2012 | Signed as free agent | Lyle Overbay | — | Atlanta Braves | Atlanta Braves signed free agent 1B Lyle Overbay to a minor league contract. |
| Aug 22, 2012 | Signed as free agent | Willy Ortiz | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Willy Ortiz to a minor league contract. |
| Aug 22, 2012 | Signed as free agent | Luis Reyes | — | Washington Nationals | Washington Nationals signed free agent RHP Luis Reyes to a minor league contract. |
| Aug 21, 2012 | Trade | Sean Jamieson | Athletics | Arizona Diamondbacks | Arizona Diamondbacks traded Stephen Drew to Oakland Athletics for Sean Jamieson. |
| Aug 21, 2012 | Signed as free agent | Jason Jaramillo | — | Athletics | Oakland Athletics signed free agent C Jason Jaramillo to a minor league contract. |
| Aug 21, 2012 | Signed as free agent | Dan Merklinger | — | Colorado Rockies | Colorado Rockies signed free agent LHP Dan Merklinger to a minor league contract. |
| Aug 21, 2012 | Signed as free agent | Eusebio Encarnacion | — | San Francisco Giants | San Francisco Giants signed free agent RHP Eusebio Encarnacion to a minor league contract. |
| Aug 21, 2012 | Signed as free agent | Gustavo Soto | — | Tampa Bay Rays | Tampa Bay Rays signed free agent LHP Gustavo Soto to a minor league contract. |
| Aug 21, 2012 | Signed as free agent | Dan Fiorito | — | New York Yankees | New York Yankees signed free agent SS Dan Fiorito to a minor league contract. |
| Aug 20, 2012 | Signed as free agent | Daniel Carela | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Daniel Carela to a minor league contract. |
| Aug 20, 2012 | Released | Jason Bartlett | — | San Diego Padres | San Diego Padres released SS Jason Bartlett. |
| Aug 20, 2012 | Signed as free agent | Amalio Diaz | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Amalio Diaz to a minor league contract. |
| Aug 20, 2012 | Signed as free agent | Ismael Maldonado | — | Kansas City Royals | Kansas City Royals signed free agent RHP Ismael Maldonado to a minor league contract. |
| Aug 19, 2012 | Signed as free agent | Yariel Vargas | — | Baltimore Orioles | Baltimore Orioles signed free agent OF Yariel Vargas to a minor league contract. |
| Aug 17, 2012 | Signed as free agent | Matt Young | — | St. Louis Cardinals | St. Louis Cardinals signed free agent LF Matt Young to a minor league contract. |
| Aug 17, 2012 | Released | Mark Hamilton | — | St. Louis Cardinals | St. Louis Cardinals released 1B Mark Hamilton. |
| Aug 17, 2012 | Signed as free agent | Jordan Allen | — | Detroit Tigers | Detroit Tigers signed free agent OF Jordan Allen to a minor league contract. |
| Aug 17, 2012 | Signed as free agent | Cory Segui | — | Baltimore Orioles | Baltimore Orioles signed free agent 1B Cory Segui to a minor league contract. |
| Aug 17, 2012 | Signed as free agent | Brett Frantini | — | Baltimore Orioles | Baltimore Orioles signed free agent C Brett Frantini to a minor league contract. |
| Aug 17, 2012 | Signed as free agent | Julio Urías | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LHP Julio Urias to a minor league contract. |
| Aug 16, 2012 | Trade | Ryan O'Sullivan | Rancho Cucamonga Quakes | Philadelphia Phillies | Rancho Cucamonga Quakes traded RHP Ryan O'Sullivan to Philadelphia Phillies. |
| Aug 16, 2012 | Trade | Pedro Beato | New York Mets | Boston Red Sox | New York Mets traded RHP Pedro Beato to Boston Red Sox. |
| Aug 16, 2012 | Signed as free agent | Horacio Ramirez | — | Chicago Cubs | Chicago Cubs signed free agent LHP Horacio Ramirez to a minor league contract. |
| Aug 16, 2012 | Signed as free agent | Felipe Perez | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Felipe Perez to a minor league contract. |
| Aug 15, 2012 | Signed as free agent | Austin Bibens-Dirkx | — | Colorado Rockies | Colorado Rockies signed free agent RHP Austin Bibens-Dirkx to a minor league contract. |
| Aug 15, 2012 | Trade | Daniel Cabrera | Pittsburgh Pirates | Arizona Diamondbacks | Pittsburgh Pirates traded RHP Daniel Cabrera to Arizona Diamondbacks. |
| Aug 15, 2012 | Signed as free agent | Jeremy Accardo | — | Athletics | Oakland Athletics signed free agent RHP Jeremy Accardo to a minor league contract. |
| Aug 14, 2012 | Signed as free agent | Matt Mangini | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent 1B Matt Mangini to a minor league contract. |
| Aug 14, 2012 | Trade | Kelly Shoppach | Boston Red Sox | New York Mets | Boston Red Sox traded C Kelly Shoppach to New York Mets for Player To Be Named Later. |
| Aug 14, 2012 | Released | Yuniesky Betancourt | — | Kansas City Royals | Kansas City Royals released 2B Yuniesky Betancourt. |
| Aug 14, 2012 | Signed as free agent | Brock Peterson | — | St. Louis Cardinals | St. Louis Cardinals signed free agent 1B Brock Peterson to a minor league contract. |
| Aug 14, 2012 | Signed as free agent | Yorvit Torrealba | — | Toronto Blue Jays | Toronto Blue Jays signed free agent C Yorvit Torrealba to a minor league contract. |
| Aug 14, 2012 | Signed as free agent | Dallas McPherson | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 3B Dallas McPherson to a minor league contract. |
| Aug 14, 2012 | Signed as free agent | Daniel Rodriguez | — | Atlanta Braves | Atlanta Braves signed free agent LHP Hector Daniel Rodriguez to a minor league contract. |
| Aug 14, 2012 | Signed | Luiz Gohara | — | Seattle Mariners | Seattle Mariners signed LHP Luiz Gohara. |
| Aug 14, 2012 | Signed as free agent | Daniel Aldrich | — | New York Yankees | New York Yankees signed free agent OF Daniel Aldrich to a minor league contract. |
| Aug 13, 2012 | Signed as free agent | Derek Lowe | — | New York Yankees | New York Yankees signed free agent RHP Derek Lowe. |
| Aug 13, 2012 | Trade | J.C. Romero | Cleveland Guardians | Baltimore Orioles | Cleveland Indians traded LHP J.C. Romero to Baltimore Orioles for 3B Carlos R Rojas. |
| Aug 13, 2012 | Signed as free agent | Johan Rodriguez | — | Cincinnati Reds | Cincinnati Reds signed free agent SS Johan Rodriguez to a minor league contract. |
| Aug 13, 2012 | Signed as free agent | Seth McClung | — | Chicago Cubs | Chicago Cubs signed free agent RHP Seth McClung to a minor league contract. |
| Aug 13, 2012 | Signed as free agent | Koyie Hill | — | Texas Rangers | Texas Rangers signed free agent C Koyie Hill to a minor league contract. |
| Aug 13, 2012 | Signed as free agent | Riley Welch | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Riley Welch to a minor league contract. |
| Aug 13, 2012 | Signed as free agent | Jake Chaplin | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent 1B Jake Chaplin to a minor league contract. |
| Aug 13, 2012 | Signed as free agent | Karl Hoschke | — | Atlanta Braves | Atlanta Braves signed free agent RF Karl Hoschke to a minor league contract. |
| Aug 13, 2012 | Signed as free agent | Magneuris Sierra | — | St. Louis Cardinals | St. Louis Cardinals signed free agent OF Magneuris Sierra to a minor league contract. |
| Aug 12, 2012 | Released | Jose Lopez | — | Cleveland Guardians | Cleveland Indians released 2B Jose Lopez. |
| Aug 12, 2012 | Signed as free agent | Ramon Pena | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Ramon Pena to a minor league contract. |
| Aug 12, 2012 | Signed as free agent | Brett Tomko | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Brett Tomko to a minor league contract. |
| Aug 11, 2012 | Signed as free agent | Jeff Marquez | — | Colorado Rockies | Colorado Rockies signed free agent RHP Jeff Marquez to a minor league contract. |
| Aug 11, 2012 | Signed as free agent | Robinzon Díaz | — | Texas Rangers | Texas Rangers signed free agent C Robinzon Diaz to a minor league contract. |
| Aug 11, 2012 | Signed as free agent | Leonel Zazueta | — | Minnesota Twins | Minnesota Twins signed free agent RHP Leonel Zazueta to a minor league contract. |
| Aug 10, 2012 | Released | Derek Lowe | — | Cleveland Guardians | Cleveland Indians released RHP Derek Lowe. |
| Aug 10, 2012 | Signed as free agent | Scott Podsednik | — | Boston Red Sox | Boston Red Sox signed free agent CF Scott Podsednik. |
| Aug 10, 2012 | Signed as free agent | Lance Zawadzki | — | St. Louis Cardinals | St. Louis Cardinals signed free agent 2B Lance Zawadzki to a minor league contract. |
| Aug 10, 2012 | Signed as free agent | Rich Mascheri | — | New York Yankees | New York Yankees signed free agent LHP Rich Mascheri to a minor league contract. |
| Aug 10, 2012 | Signed as free agent | Zach Woods | — | New York Yankees | New York Yankees signed free agent RHP Zach Woods to a minor league contract. |
| Aug 10, 2012 | Signed as free agent | Joe Robinson | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Joe Robinson to a minor league contract. |
| Aug 9, 2012 | Trade | Tyler Greene | St. Louis Cardinals | Houston Astros | St. Louis Cardinals traded 2B Tyler Greene to Houston Astros. |
| Aug 9, 2012 | Released | Jeremy Accardo | — | Cleveland Guardians | Cleveland Indians released RHP Jeremy Accardo. |
| Aug 9, 2012 | Released | Johnny Damon | — | Cleveland Guardians | Cleveland Indians released LF Johnny Damon. |
| Aug 9, 2012 | Signed as free agent | Drew Carpenter | — | New York Mets | New York Mets signed free agent RHP Drew Carpenter to a minor league contract. |
| Aug 9, 2012 | Signed as free agent | Ron Schreurs | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Ron Schreurs to a minor league contract. |
| Aug 9, 2012 | Signed as free agent | Hector Vargas | — | Cincinnati Reds | Cincinnati Reds signed free agent SS Hector Vargas to a minor league contract. |
| Aug 8, 2012 | Released | Yorvit Torrealba | — | Texas Rangers | Texas Rangers released C Yorvit Torrealba. |
| Aug 8, 2012 | Signed as free agent | Reynaldo López | — | Washington Nationals | Washington Nationals signed free agent RHP Reynaldo Lopez to a minor league contract. |
| Aug 6, 2012 | Signed as free agent | Ramses Rosario | — | Washington Nationals | Washington Nationals signed free agent RHP Ramses Rosario to a minor league contract. |
| Aug 6, 2012 | Signed as free agent | Aldrem Corredor | — | Washington Nationals | Washington Nationals signed free agent OF Aldrem Corredor to a minor league contract. |
| Aug 6, 2012 | Signed as free agent | Darryl Florentino | — | Washington Nationals | Washington Nationals signed free agent OF Darryl Florentino to a minor league contract. |
| Aug 6, 2012 | Signed as free agent | Wil Nieves | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent C Wil Nieves. |
| Aug 6, 2012 | Signed as free agent | Luis Guzman | — | Washington Nationals | Washington Nationals signed free agent OF Luis Guzman to a minor league contract. |
| Aug 6, 2012 | Signed as free agent | Chris Green | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Chris Green to a minor league contract. |
| Aug 6, 2012 | Signed as free agent | Joe Rosan | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Joe Rosan to a minor league contract. |
| Aug 5, 2012 | Trade | Jeff Baker | Chicago Cubs | Detroit Tigers | Chicago Cubs traded 1B Jeff Baker to Detroit Tigers for Player To Be Named Later and Player To Be Named Later. |
| Aug 5, 2012 | Trade | Danny Valencia | Minnesota Twins | Boston Red Sox | Minnesota Twins traded 3B Danny Valencia to Boston Red Sox for OF Jeremias Pineda. |
| Aug 5, 2012 | Released | Mike Fontenot | — | Philadelphia Phillies | Philadelphia Phillies released 2B Mike Fontenot. |
| Aug 5, 2012 | Signed as free agent | Jack Cust | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RF Jack Cust to a minor league contract. |
| Aug 5, 2012 | Signed as free agent | Jake Opitz | — | Philadelphia Phillies | Philadelphia Phillies signed free agent 1B Jake Opitz to a minor league contract. |
| Aug 5, 2012 | Signed as free agent | Eric Junge | — | Colorado Rockies | Colorado Rockies signed free agent RHP Eric Junge to a minor league contract. |
| Aug 5, 2012 | Signed as free agent | Raymond Kruml | — | St. Louis Cardinals | St. Louis Cardinals signed free agent OF Raymond Kruml to a minor league contract. |
| Aug 5, 2012 | Signed as free agent | Xavier Nady | — | San Francisco Giants | San Francisco Giants signed free agent LF Xavier Nady to a minor league contract. |
| Aug 5, 2012 | Signed as free agent | Brian Sanches | — | Houston Astros | Houston Astros signed free agent RHP Brian Sanches to a minor league contract. |
| Aug 5, 2012 | Signed as free agent | Brett Jacobson | — | Colorado Rockies | Colorado Rockies signed free agent RHP Brett Jacobson to a minor league contract. |
| Aug 5, 2012 | Signed as free agent | Enderson Prado | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Enderson Prado to a minor league contract. |
| Aug 5, 2012 | Signed as free agent | Frehumar Rivas | — | Tampa Bay Rays | Tampa Bay Rays signed free agent LHP Frehumar Rivas to a minor league contract. |
| Aug 5, 2012 | Signed as free agent | David Rodríguez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent C David Rodriguez to a minor league contract. |
| Aug 4, 2012 | Signed as free agent | Jake Fox | — | Philadelphia Phillies | Philadelphia Phillies signed free agent 3B Jake Fox to a minor league contract. |
| Aug 4, 2012 | Signed as free agent | Tyler Mack | — | Kansas City Royals | Kansas City Royals signed free agent RHP Tyler Mack to a minor league contract. |
| Aug 3, 2012 | Trade | Garrett Mock | Boston Red Sox | Houston Astros | Boston Red Sox traded RHP Garrett Mock to Houston Astros. |
| Aug 3, 2012 | Trade | David Freitas | Washington Nationals | Athletics | Oakland Athletics traded cash and C Kurt Suzuki to Washington Nationals for C David Freitas. |
| Aug 3, 2012 | Trade | Chris Devenski | Chicago White Sox | Houston Astros | Chicago White Sox traded RHP Chris Devenski to Houston Astros. |
| Aug 3, 2012 | Trade | Joe Blanton | Philadelphia Phillies | Los Angeles Dodgers | Philadelphia Phillies traded RHP Joe Blanton to Los Angeles Dodgers for cash. |
| Aug 3, 2012 | Signed as free agent | Dewayne Wise | — | Chicago White Sox | Chicago White Sox signed free agent CF Dewayne Wise to a minor league contract. |
| Aug 3, 2012 | Released | Lyle Overbay | — | Arizona Diamondbacks | Arizona Diamondbacks released 1B Lyle Overbay. |
| Aug 3, 2012 | Released | Wil Nieves | — | Colorado Rockies | Colorado Rockies released C Wil Nieves. |
| Aug 3, 2012 | Signed as free agent | Matt Anderson | — | Seattle Mariners | Seattle Mariners signed free agent RHP Matt Anderson to a minor league contract. |
| Aug 3, 2012 | Signed as free agent | Ryan Fennell | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Ryan Fennell to a minor league contract. |
| Aug 3, 2012 | Signed | Randy Reyes | — | Colorado Rockies | Colorado Rockies signed IF Randy Reyes. |
| Aug 3, 2012 | Signed as free agent | Chih-Wei Hu | — | Minnesota Twins | Minnesota Twins signed free agent Chih-Wei Hu. |
| Aug 2, 2012 | Released | Scott Podsednik | — | Arizona Diamondbacks | Arizona Diamondbacks released CF Scott Podsednik. |
| Aug 2, 2012 | Signed as free agent | Frank Gailey | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Frank Gailey to a minor league contract. |
| Aug 2, 2012 | Signed as free agent | Randol Rogers | — | Minnesota Twins | Minnesota Twins signed free agent Randol Rogers. |
| Aug 2, 2012 | Signed as free agent | Scott Patterson | — | New York Mets | New York Mets signed free agent RHP Scott Patterson to a minor league contract. |
| Aug 2, 2012 | Signed as free agent | Bernys Almarante | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent SS Bernys Almarante to a minor league contract. |
| Aug 2, 2012 | Signed as free agent | Thairo Estrada | — | New York Yankees | New York Yankees signed free agent SS Thairo Estrada to a minor league contract. |
| Aug 1, 2012 | Released | Hideki Matsui | — | Tampa Bay Rays | Tampa Bay Rays released DH Hideki Matsui. |
| Aug 1, 2012 | Signed as free agent | B.J. López | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent C B.J. Lopez to a minor league contract. |
| Aug 1, 2012 | Signed | Calten Daal | — | Cincinnati Reds | Cincinnati Reds signed SS Carlton Daal. |
| Aug 1, 2012 | Signed as free agent | Johan De Jesus | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 3B Johan De Jesus to a minor league contract. |
| Jul 31, 2012 | Trade | Travis Snider | Toronto Blue Jays | Pittsburgh Pirates | Toronto Blue Jays traded RF Travis Snider to Pittsburgh Pirates for RHP Brad Lincoln. |
| Jul 31, 2012 | Trade | Paul Maholm | Chicago Cubs | Atlanta Braves | Chicago Cubs traded LHP Paul Maholm and LF Reed Johnson to Atlanta Braves for RHP Arodys Vizcaino and RHP Jaye Chapman. |
| Jul 31, 2012 | Trade | Steve Delabar | Seattle Mariners | Toronto Blue Jays | Toronto Blue Jays traded RF Eric Thames to Seattle Mariners for RHP Steve Delabar. |
| Jul 31, 2012 | Trade | Leon Landry | Los Angeles Dodgers | Seattle Mariners | Seattle Mariners traded RHP Brandon League to Los Angeles Dodgers for RHP Logan Bawcom and CF Leon Landry. |
| Jul 31, 2012 | Trade | Jake Brigham | Texas Rangers | Chicago Cubs | Chicago Cubs traded C Geovany Soto to Texas Rangers for RHP Jake Brigham. |
| Jul 31, 2012 | Trade | Shane Victorino | Philadelphia Phillies | Los Angeles Dodgers | Philadelphia Phillies traded CF Shane Victorino to Los Angeles Dodgers for RHP Josh Lindblom and RHP Ethan Martin. |
| Jul 31, 2012 | Trade | Nate Schierholtz | San Francisco Giants | Philadelphia Phillies | Philadelphia Phillies traded RF Hunter Pence to San Francisco Giants for RF Nate Schierholtz, C Tommy Joseph and RHP Seth Rosin. |
| Jul 31, 2012 | Trade | Edward Mujica | Miami Marlins | St. Louis Cardinals | Miami Marlins traded RHP Edward Mujica to St. Louis Cardinals for 3B Zack Cox. |
| Jul 31, 2012 | Trade | Gaby Sanchez | Miami Marlins | Pittsburgh Pirates | Miami Marlins traded 1B Gaby Sanchez and RHP Kyle Kaminska to Pittsburgh Pirates for CF Gorkys Hernandez. |
| Jul 31, 2012 | Trade | Craig Breslow | Arizona Diamondbacks | Boston Red Sox | Arizona Diamondbacks traded LHP Craig Breslow to Boston Red Sox for RHP Matt Albers and CF Scott Podsednik. |
| Jul 31, 2012 | Trade | Casey McGehee | Pittsburgh Pirates | New York Yankees | New York Yankees traded RHP Chad Qualls to Pittsburgh Pirates for 1B Casey McGehee. |
| Jul 31, 2012 | Trade | Jonathan Broxton | Kansas City Royals | Cincinnati Reds | Kansas City Royals traded RHP Jonathan Broxton to Cincinnati Reds for LHP Donnie Joseph and RHP J.C. Sulbaran. |
| Jul 31, 2012 | Trade | Ryan Dempster | Chicago Cubs | Texas Rangers | Chicago Cubs traded RHP Ryan Dempster to Texas Rangers for RHP Kyle Hendricks and 3B Christian Villanueva. |
| Jul 31, 2012 | Trade | Steven Wright | Cleveland Guardians | Boston Red Sox | Boston Red Sox traded 1B Lars Anderson to Cleveland Indians for RHP Steven Wright. |
| Jul 31, 2012 | Released | Dewayne Wise | — | New York Yankees | New York Yankees released CF Dewayne Wise. |
| Jul 31, 2012 | Signed as free agent | Erik Turgeon | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Erik Turgeon to a minor league contract. |
| Jul 31, 2012 | Signed as free agent | Tommy Manzella | — | Chicago White Sox | Chicago White Sox signed free agent SS Tommy Manzella to a minor league contract. |
| Jul 31, 2012 | Signed as free agent | Vladimir Frias | — | Chicago Cubs | Chicago Cubs signed free agent 2B Vladimir Frias to a minor league contract. |
| Jul 31, 2012 | Signed | Luke Hughes | — | Toronto Blue Jays | Toronto Blue Jays signed 3B Luke Hughes. |
| Jul 30, 2012 | Signed as free agent | Jonny Tucker | — | Washington Nationals | Washington Nationals signed free agent CF Jonny Tucker to a minor league contract. |
| Jul 30, 2012 | Signed as free agent | Charley Short | — | New York Yankees | New York Yankees signed free agent RHP Charley Short to a minor league contract. |
| Jul 30, 2012 | Signed as free agent | Raul Ruiz | — | Washington Nationals | Washington Nationals signed free agent LHP Raul Ruiz to a minor league contract. |
| Jul 30, 2012 | Signed as free agent | Ryan Dale | — | Kansas City Royals | Kansas City Royals signed free agent 3B Ryan Dale to a minor league contract. |
| Jul 30, 2012 | Signed as free agent | Mario Adames | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Mario Adames to a minor league contract. |
| Jul 30, 2012 | Signed as free agent | Wes Parsons | — | Atlanta Braves | Atlanta Braves signed free agent RHP Wes Parsons to a minor league contract. |
| Jul 29, 2012 | Trade | Pedro Hernandez | Chicago White Sox | Minnesota Twins | Minnesota Twins traded LHP Francisco Liriano to Chicago White Sox for SS Eduardo Escobar and LHP Pedro Hernandez. |
| Jul 29, 2012 | Released | Xavier Nady | — | Washington Nationals | Washington Nationals released LF Xavier Nady. |
| Jul 29, 2012 | Trade | Chris Johnson | Houston Astros | Arizona Diamondbacks | Mobile BayBears Traded 3B Bobby Borchering and LF Marc Krauss to Corpus Christi Hooks and Houston Astros Traded Chris Johnson to Arizona Diamondbacks. |
| Jul 29, 2012 | Trade | Bobby Borchering | Arizona Diamondbacks | Houston Astros | Houston Astros traded 3B Chris Johnson to Arizona Diamondbacks for Bobby Borchering and Marc Krauss. |
| Jul 29, 2012 | Trade | George Kottaras | Milwaukee Brewers | Athletics | Oakland Athletics traded RHP Fautino De Los Santos to Milwaukee Brewers for C George Kottaras. |
| Jul 29, 2012 | Signed as free agent | Greg Paiml | — | Chicago White Sox | Chicago White Sox signed free agent 3B Greg Paiml to a minor league contract. |
| Jul 28, 2012 | Trade | Marco Scutaro | Colorado Rockies | San Francisco Giants | Colorado Rockies traded 2B Marco Scutaro to San Francisco Giants for 2B Charlie Culberson. |
| Jul 28, 2012 | Signed | Miguel Batista | — | Atlanta Braves | Atlanta Braves signed RHP Miguel Batista. |
| Jul 28, 2012 | Signed | Josh Kroeger | — | Atlanta Braves | Atlanta Braves signed OF Josh Kroeger. |
| Jul 28, 2012 | Signed | Humberto Quintero | — | Milwaukee Brewers | Milwaukee Brewers signed Humberto Quintero. |
| Jul 28, 2012 | Trade | Christian Marrero | Atlanta Braves | Pittsburgh Pirates | Atlanta Braves traded OF Christian Marrero to Pittsburgh Pirates for 2B Brian Friday. |
| Jul 28, 2012 | Signed as free agent | Mike MacDougal | — | Washington Nationals | Washington Nationals signed free agent RHP Mike MacDougal to a minor league contract. |
| Jul 28, 2012 | Signed | Ifran Becerra | — | Arizona Diamondbacks | Arizona Diamondbacks signed SS Ifran Becerra. |
| Jul 28, 2012 | Signed | Adam Russell | — | Los Angeles Angels | Los Angeles Angels signed RHP Adam Russell. |
| Jul 28, 2012 | Signed as free agent | Dedgar Jimenez | — | Boston Red Sox | Boston Red Sox signed free agent LHP Dedgar Jimenez to a minor league contract. |
| Jul 27, 2012 | Signed as free agent | Rusty Ryal | — | Atlanta Braves | Atlanta Braves signed free agent 2B Rusty Ryal to a minor league contract. |
| Jul 27, 2012 | Signed as free agent | Brian Broderick | — | Washington Nationals | Washington Nationals signed free agent RHP Brian Broderick to a minor league contract. |
| Jul 27, 2012 | Released | Rick Ankiel | — | Washington Nationals | Washington Nationals released CF Rick Ankiel. |
| Jul 27, 2012 | Trade | Ariel Peña | Arkansas Travelers | Milwaukee Brewers | Los Angeles Angels Traded SS Jean Segura to Milwaukee Brewers; Arkansas Travelers Traded RHP Ariel Pena and RHP Johnny Hellweg to Milwaukee Brewers and Milwaukee Brewers Traded RHP Zack Greinke to Los Angeles Angels. |
| Jul 27, 2012 | Signed as free agent | Humberto Quintero | — | Milwaukee Brewers | Milwaukee Brewers signed free agent C Humberto Quintero to a minor league contract. |
| Jul 27, 2012 | Signed as free agent | Jeff Frazier | — | Chicago Cubs | Chicago Cubs signed free agent LF Jeff Frazier to a minor league contract. |
| Jul 27, 2012 | Signed as free agent | Ryan Eigsti | — | Toronto Blue Jays | Toronto Blue Jays signed free agent C Ryan Eigsti to a minor league contract. |
| Jul 27, 2012 | Signed as free agent | Andrew Aizenstadt | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Andrew Aizenstadt to a minor league contract. |
| Jul 27, 2012 | Signed as free agent | Mitchell Martes | — | Athletics | Oakland Athletics signed free agent IF Mitchell Martes to a minor league contract. |
| Jul 26, 2012 | Signed as free agent | Michael Gunter | — | Chicago White Sox | Chicago White Sox signed free agent RHP Michael Gunter to a minor league contract. |
| Jul 26, 2012 | Signed as free agent | David Haselden | — | Chicago White Sox | Chicago White Sox signed free agent RHP David Haselden to a minor league contract. |
| Jul 26, 2012 | Released | Trevor Bell | — | Los Angeles Angels | Los Angeles Angels released RHP Trevor Bell. |
| Jul 26, 2012 | Signed as free agent | Jordan Guida | — | Detroit Tigers | Detroit Tigers signed free agent C Jordan Guida to a minor league contract. |
| Jul 26, 2012 | Signed as free agent | Jarrett Grube | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Jarrett Grube to a minor league contract. |
| Jul 26, 2012 | Signed as free agent | Roquely Ortiz | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Roquely Ortiz to a minor league contract. |
| Jul 26, 2012 | Signed as free agent | Mario Sanchez | — | Washington Nationals | Washington Nationals signed free agent RHP Mario Sanchez to a minor league contract. |
| Jul 26, 2012 | Signed as free agent | Josh Guyer | — | Minnesota Twins | Minnesota Twins signed free agent RHP Josh Guyer to a minor league contract. |
| Jul 26, 2012 | Signed | Josh Guyer | — | Minnesota Twins | Minnesota Twins signed Josh Guyer. |
| Jul 25, 2012 | Trade | Tyler Bortnick | Tampa Bay Rays | Arizona Diamondbacks | Arizona Diamondbacks traded 2B Ryan Roberts to Tampa Bay Rays for 2B Tyler Bortnick. |
| Jul 25, 2012 | Trade | Colton Cain | Pittsburgh Pirates | Houston Astros | Houston Astros traded LHP Wandy Rodriguez to Pittsburgh Pirates for LHP Colton Cain, CF Robbie Grossman and LHP Rudy Owens. |
| Jul 25, 2012 | Trade | Scott McGough | Los Angeles Dodgers | Miami Marlins | Miami Marlins traded LHP Randy Choate and SS Hanley Ramirez to Los Angeles Dodgers for RHP Nathan Eovaldi and RHP Scott McGough. |
| Jul 25, 2012 | Signed as free agent | Eric Maria | — | Tampa Bay Rays | Tampa Bay Rays signed free agent C Eric Maria to a minor league contract. |
| Jul 24, 2012 | Trade | Barry Enright | Arizona Diamondbacks | Los Angeles Angels | Arizona Diamondbacks traded RHP Barry Enright to Los Angeles Angels for cash. |
| Jul 24, 2012 | Trade | Brent Lillibridge | Boston Red Sox | Cleveland Guardians | Boston Red Sox traded CF Brent Lillibridge to Cleveland Indians for RHP Jose De La Torre. |
| Jul 24, 2012 | Signed as free agent | Henry Urrutia | — | Baltimore Orioles | Baltimore Orioles signed free agent OF Henry Urrutia to a minor league contract. |
| Jul 24, 2012 | Signed as free agent | Craig Hansen | — | New York Mets | New York Mets signed free agent RHP Craig Hansen to a minor league contract. |
| Jul 24, 2012 | Signed as free agent | Brian Compton | — | Minnesota Twins | Minnesota Twins signed free agent C Brian Compton to a minor league contract. |
| Jul 24, 2012 | Signed as free agent | Scott Copeland | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Scott Copeland to a minor league contract. |
| Jul 24, 2012 | Released | Miguel Batista | — | New York Mets | New York Mets released RHP Miguel Batista. |
| Jul 24, 2012 | Signed as free agent | Eskarlin Vasquez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Eskarlin Vasquez to a minor league contract. |
| Jul 24, 2012 | Signed as free agent | Will Changarotty | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Will Changarotty to a minor league contract. |
| Jul 24, 2012 | Signed as free agent | Emmanuel Alvarez | — | Atlanta Braves | Atlanta Braves signed free agent OF Emmanuel Alvarez to a minor league contract. |
| Jul 23, 2012 | Trade | Aníbal Sánchez | Miami Marlins | Detroit Tigers | Miami Marlins Traded RHP Anibal Sanchez and 2B Omar Infante to Detroit Tigers; Detroit Tigers Traded RHP Jacob Turner to Miami Marlins; Toledo Mud Hens Traded C Rob Brantly to New Orleans Zephyrs and Erie SeaWolves Traded LHP Brian Flynn to Jacksonville Suns. |
| Jul 23, 2012 | Trade | Ichiro Suzuki | Seattle Mariners | New York Yankees | Seattle Mariners Traded RF Ichiro Suzuki to New York Yankees; New York Yankees Traded RHP D.J. Mitchell to Seattle Mariners and Scranton/Wilkes-Barre Yankees Traded RHP Danny Farquhar to Tacoma Rainiers. |
| Jul 23, 2012 | Signed as free agent | Matt Talley | — | Chicago White Sox | Chicago White Sox signed free agent LHP Matt Talley to a minor league contract. |
| Jul 23, 2012 | Signed as free agent | Jarrad Page | — | San Francisco Giants | San Francisco Giants signed free agent OF Jarrad Page to a minor league contract. |
| Jul 23, 2012 | Signed as free agent | Eric Hurley | — | Minnesota Twins | Minnesota Twins signed free agent RHP Eric Hurley to a minor league contract. |
| Jul 23, 2012 | Signed as free agent | Nelson Figueroa | — | Boston Red Sox | Boston Red Sox signed free agent RHP Nelson Figueroa to a minor league contract. |
| Jul 23, 2012 | Signed as free agent | Kyle Hoppy | — | Philadelphia Phillies | Philadelphia Phillies signed free agent OF Kyle Hoppy to a minor league contract. |
| Jul 23, 2012 | Signed as free agent | David Jones | — | Seattle Mariners | Seattle Mariners signed free agent C David Jones to a minor league contract. |
| Jul 23, 2012 | Signed as free agent | Chris Pettit | — | Colorado Rockies | Colorado Rockies signed free agent LF Chris Pettit to a minor league contract. |
| Jul 22, 2012 | Signed as free agent | Matt Nevarez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Matt Nevarez to a minor league contract. |
| Jul 22, 2012 | Signed as free agent | David Matos | — | Atlanta Braves | Atlanta Braves signed free agent David Matos. |
| Jul 22, 2012 | Signed as free agent | David Matos | — | Atlanta Braves | Atlanta Braves signed free agent LHP David Matos to a minor league contract. |
| Jul 22, 2012 | Signed as free agent | Cody Evans | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Cody Evans to a minor league contract. |
| Jul 22, 2012 | Signed as free agent | Andrew Wall | — | Washington Nationals | Washington Nationals signed free agent LHP Andrew Wall to a minor league contract. |
| Jul 21, 2012 | Signed as free agent | Will Ohman | — | Cincinnati Reds | Cincinnati Reds signed free agent LHP Will Ohman to a minor league contract. |
| Jul 21, 2012 | Trade | Brett Myers | Houston Astros | Chicago White Sox | Houston Astros Traded RHP Brett Myers to Chicago White Sox; Birmingham Barons Traded RHP Matt Heidenreich to Corpus Christi Hooks and Winston-Salem Dash Traded LHP Blair Walters to Lancaster JetHawks. |
| Jul 21, 2012 | Signed as free agent | Jose Almonte | — | Boston Red Sox | Boston Red Sox signed free agent RHP Jose Almonte to a minor league contract. |
| Jul 21, 2012 | Signed as free agent | Raiwinson Lameda | — | Boston Red Sox | Boston Red Sox signed free agent OF Raiwinson Lameda to a minor league contract. |
| Jul 20, 2012 | Trade | Jonathan Sánchez | Kansas City Royals | Colorado Rockies | Kansas City Royals traded LHP Jonathan Sanchez to Colorado Rockies for RHP Jeremy Guthrie. |
| Jul 20, 2012 | Trade | Brandon Lyon | Houston Astros | Toronto Blue Jays | Houston Astros Traded RHP Brandon Lyon, LHP J.A. Happ and RHP David Carpenter to Toronto Blue Jays; Toronto Blue Jays Traded RHP Francisco Cordero and LF Ben Francisco to Houston Astros; Bluefield Blue Jays Traded RHP Joe Musgrove to Greeneville Astros; Dunedin Blue Jays Traded RHP Asher Wojciechowski to Corpus Christi Hooks; Lansing Lugnuts Traded LHP David Rollins to Lexington Legends and Lansing Lugnuts Traded C Carlos Perez to Lancaster JetHawks. |
| Jul 20, 2012 | Trade | Omar Quintanilla | New York Mets | Baltimore Orioles | New York Mets traded SS Omar Quintanilla to Baltimore Orioles for cash. |
| Jul 20, 2012 | Released | Geoff Blum | — | Arizona Diamondbacks | Arizona Diamondbacks released 3B Geoff Blum. |
| Jul 20, 2012 | Signed as free agent | Mike Spina | — | Atlanta Braves | Atlanta Braves signed free agent 1B Mike Spina to a minor league contract. |
| Jul 20, 2012 | Signed as free agent | Kipp Schutz | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LF Kipp Schutz to a minor league contract. |
| Jul 20, 2012 | Signed as free agent | J.C. Romero | — | Cleveland Guardians | Cleveland Indians signed free agent LHP J.C. Romero to a minor league contract. |
| Jul 20, 2012 | Signed | Michael Tarsi | — | Atlanta Braves | Atlanta Braves signed LHP Michael Tarsi. |
| Jul 20, 2012 | Signed as free agent | Jon Carnahan | — | Houston Astros | Houston Astros signed free agent C Jon Carnahan to a minor league contract. |
| Jul 20, 2012 | Signed as free agent | Isael Henriquez | — | Atlanta Braves | Atlanta Braves signed free agent OF Isael Henriquez to a minor league contract. |
| Jul 20, 2012 | Signed as free agent | Francisco Rios | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Francisco Rios to a minor league contract. |
| Jul 19, 2012 | Trade | Dan Brewer | New York Yankees | Atlanta Braves | New York Yankees traded RF Dan Brewer to Atlanta Braves. |
| Jul 19, 2012 | Trade | Justin Germano | Boston Red Sox | Chicago Cubs | Boston Red Sox traded RHP Justin Germano to Chicago Cubs. |
| Jul 19, 2012 | Signed as free agent | Reinier Roibal | — | San Francisco Giants | San Francisco Giants signed free agent RHP Reinier Roibal to a minor league contract. |
| Jul 19, 2012 | Signed as free agent | Gerald Chin | — | Atlanta Braves | Atlanta Braves signed free agent 2B Gerald Chin to a minor league contract. |
| Jul 19, 2012 | Signed as free agent | Jeremy McLeod | — | Colorado Rockies | Colorado Rockies signed free agent OF Jeremy McLeod to a minor league contract. |
| Jul 19, 2012 | Signed as free agent | Yunior Marte | — | Kansas City Royals | Kansas City Royals signed free agent RHP Yunior Marte to a minor league contract. |
| Jul 19, 2012 | Signed as free agent | Jorma Rodriguez | — | Cleveland Guardians | Cleveland Indians signed free agent SS Jorma Rodriguez to a minor league contract. |
| Jul 18, 2012 | Signed as free agent | Jason Kendall | — | Kansas City Royals | Kansas City Royals signed free agent C Jason Kendall to a minor league contract. |
| Jul 18, 2012 | Signed as free agent | Jaime Pedroza | — | Atlanta Braves | Atlanta Braves signed free agent 2B Jaime Pedroza to a minor league contract. |
| Jul 18, 2012 | Signed as free agent | Chorye Spoone | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Chorye Spoone to a minor league contract. |
| Jul 18, 2012 | Signed as free agent | Ryan Strieby | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent 1B Ryan Strieby to a minor league contract. |
| Jul 18, 2012 | Signed as free agent | Joseph Yermal | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Joseph Yermal to a minor league contract. |
| Jul 17, 2012 | Signed as free agent | Michael Solbach | — | Colorado Rockies | Colorado Rockies signed free agent RHP Michael Solbach to a minor league contract. |
| Jul 17, 2012 | Signed as free agent | Javier Rodriguez | — | Boston Red Sox | Boston Red Sox signed free agent LHP Javier Rodriguez to a minor league contract. |
| Jul 17, 2012 | Signed as free agent | Matt McSwain | — | Athletics | Oakland Athletics signed free agent RHP Matt McSwain to a minor league contract. |
| Jul 17, 2012 | Signed as free agent | Jesse Fernandez | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Jesse Fernandez to a minor league contract. |
| Jul 17, 2012 | Signed as free agent | Erick Threets | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LHP Erick Threets to a minor league contract. |
| Jul 17, 2012 | Signed as free agent | Patrick Scoggin | — | Atlanta Braves | Atlanta Braves signed free agent RHP Patrick Scoggin to a minor league contract. |
| Jul 17, 2012 | Signed | Mac Williamson | — | San Francisco Giants | San Francisco Giants signed RF Mac Williamson. |
| Jul 16, 2012 | Signed as free agent | Nate Robertson | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Nate Robertson to a minor league contract. |
| Jul 16, 2012 | Signed as free agent | Trevor Crowe | — | Los Angeles Angels | Los Angeles Angels signed free agent OF Trevor Crowe to a minor league contract. |
| Jul 16, 2012 | Signed as free agent | Chase Brewer | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Chase Brewer to a minor league contract. |
| Jul 16, 2012 | Signed as free agent | Gerardo Sanchez | — | Houston Astros | Houston Astros signed free agent RHP Gerardo Sanchez to a minor league contract. |
| Jul 15, 2012 | Signed as free agent | Danny Dorn | — | Detroit Tigers | Detroit Tigers signed free agent OF Danny Dorn to a minor league contract. |
| Jul 15, 2012 | Signed as free agent | Les Walrond | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Les Walrond to a minor league contract. |
| Jul 15, 2012 | Signed as free agent | Kosuke Fukudome | — | New York Yankees | New York Yankees signed free agent RF Kosuke Fukudome to a minor league contract. |
| Jul 15, 2012 | Signed as free agent | Brian Fuentes | — | St. Louis Cardinals | St. Louis Cardinals signed free agent LHP Brian Fuentes to a minor league contract. |
| Jul 15, 2012 | Signed as free agent | C.J. Nitkowski | — | New York Mets | New York Mets signed free agent LHP C.J. Nitkowski to a minor league contract. |
| Jul 14, 2012 | Signed as free agent | Humberto Quintero | — | Miami Marlins | Miami Marlins signed free agent C Humberto Quintero to a minor league contract. |
| Jul 14, 2012 | Trade | Todd Redmond | Atlanta Braves | Cincinnati Reds | Atlanta Braves traded RHP Todd Redmond to Cincinnati Reds for SS Paul Janish. |
| Jul 13, 2012 | Signed | Caleb Hamrick | — | Cleveland Guardians | Cleveland Indians signed RHP Caleb Hamrick. |
| Jul 13, 2012 | Signed | Tyler Hensley | — | New York Yankees | New York Yankees signed RHP Ty Hensley. |
| Jul 13, 2012 | Signed | D'vone McClure | — | Cleveland Guardians | Cleveland Indians signed OF D'vone McClure. |
| Jul 13, 2012 | Signed | Richie Shaffer | — | Tampa Bay Rays | Tampa Bay Rays signed 3B Richie Shaffer. |
| Jul 13, 2012 | Signed | Max Moroff | — | Pittsburgh Pirates | Pittsburgh Pirates signed IF Max Moroff. |
| Jul 13, 2012 | Signed | Hayden Hurst | — | Pittsburgh Pirates | Pittsburgh Pirates signed RHP Hayden Hurst. |
| Jul 13, 2012 | Signed | John Kuchno | — | Pittsburgh Pirates | Pittsburgh Pirates signed RHP John Kuchno. |
| Jul 13, 2012 | Signed | Stephen Williams | — | Boston Red Sox | Boston Red Sox signed RHP Stephen Williams. |
| Jul 13, 2012 | Signed | Willie Ethington | — | Boston Red Sox | Boston Red Sox signed RHP Willie Ethington. |
| Jul 13, 2012 | Signed | Brandon Magee | — | Boston Red Sox | Boston Red Sox signed OF Brandon Magee. |
| Jul 13, 2012 | Signed | Khiry Cooper | — | Boston Red Sox | Boston Red Sox signed OF Khiry Cooper. |
| Jul 13, 2012 | Signed | Nolan Sanburn | — | Athletics | Oakland Athletics signed RHP Nolan Sanburn. |
| Jul 13, 2012 | Signed | Kevin Gausman | — | Baltimore Orioles | Baltimore Orioles signed RHP Kevin Gausman. |
| Jul 13, 2012 | Signed | Logan Vick | — | Cleveland Guardians | Cleveland Indians signed OF Logan Vick. |
| Jul 13, 2012 | Signed | Lucas Giolito | — | Washington Nationals | Washington Nationals signed RHP Lucas Giolito. |
| Jul 13, 2012 | Signed | Andrew Heaney | — | Miami Marlins | Miami Marlins signed LHP Andrew Heaney. |
| Jul 13, 2012 | Signed | Kevin Ross | — | Pittsburgh Pirates | Pittsburgh Pirates signed OF Kevin Ross. |
| Jul 13, 2012 | Signed | Adam Matthews | — | Cincinnati Reds | Cincinnati Reds signed OF Adam Matthews. |
| Jul 13, 2012 | Signed as free agent | David Pauley | — | Seattle Mariners | Seattle Mariners signed free agent RHP David Pauley to a minor league contract. |
| Jul 13, 2012 | Signed as free agent | Cade Kreuter | — | San Diego Padres | San Diego Padres signed free agent 1B Cade Kreuter to a minor league contract. |
| Jul 13, 2012 | Signed | Avery Romero | — | Miami Marlins | Miami Marlins signed SS Avery Romero. |
| Jul 13, 2012 | Signed | Preston Tucker | — | Houston Astros | Houston Astros signed OF Preston Tucker. |
| Jul 13, 2012 | Signed | Martin Agosta | — | San Francisco Giants | San Francisco Giants signed RHP Martin Agosta. |
| Jul 13, 2012 | Signed | Jordan Guerrero | — | Chicago White Sox | Chicago White Sox signed LHP Jordan Guerrero. |
| Jul 13, 2012 | Signed | Andrew Ferreira | — | Minnesota Twins | Minnesota Twins signed LHP Andrew Ferreira. |
| Jul 13, 2012 | Signed | Zach Vincej | — | Cincinnati Reds | Cincinnati Reds signed SS Zach Vincej. |
| Jul 13, 2012 | Signed | Josh Henderson | — | Los Angeles Dodgers | Los Angeles Dodgers signed OF Josh Henderson. |
| Jul 13, 2012 | Signed | Raymond Hunnicutt | — | Baltimore Orioles | Baltimore Orioles signed OF Raymond Hunnicutt. |
| Jul 13, 2012 | Signed | Charles Haslup | — | New York Yankees | New York Yankees signed RHP Charles Haslup. |
| Jul 13, 2012 | Signed | Dalton Smith | — | New York Yankees | New York Yankees signed C Dalton Smith. |
| Jul 13, 2012 | Signed | Kevin Heller | — | Boston Red Sox | Boston Red Sox signed OF Kevin Heller. |
| Jul 13, 2012 | Signed | Terrance Owens | — | San Diego Padres | San Diego Padres signed LHP Terrance Owens. |
| Jul 13, 2012 | Signed | Chris Kirsch | — | Tampa Bay Rays | Tampa Bay Rays signed LHP Chris Kirsch. |
| Jul 12, 2012 | Signed | Jairo Beras | — | Texas Rangers | Texas Rangers signed OF Jairo Beras. |
| Jul 12, 2012 | Signed as free agent | Matt Rizzotti | — | Athletics | Oakland Athletics signed free agent 1B Matt Rizzotti to a minor league contract. |
| Jul 12, 2012 | Signed | D.J. Brown | — | Cleveland Guardians | Cleveland Indians signed RHP D.J. Brown. |
| Jul 12, 2012 | Signed | Duane Underwood Jr. | — | Chicago Cubs | Chicago Cubs signed RHP Duane Underwood. |
| Jul 12, 2012 | Signed as free agent | Chris Ray | — | Athletics | Oakland Athletics signed free agent RHP Chris Ray to a minor league contract. |
| Jul 12, 2012 | Signed as free agent | Terry Tiffee | — | Atlanta Braves | Atlanta Braves signed free agent 3B Terry Tiffee to a minor league contract. |
| Jul 12, 2012 | Signed as free agent | Michael Dubee | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Michael Dubee to a minor league contract. |
| Jul 12, 2012 | Signed | Andre Martinez | — | Minnesota Twins | Minnesota Twins signed LHP Andre Martinez. |
| Jul 12, 2012 | Signed | Zack Larson | — | Minnesota Twins | Minnesota Twins signed OF Zach Larson. |
| Jul 12, 2012 | Signed | Jharel Cotton | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP Jharel Cotton. |
| Jul 12, 2012 | Signed | Jose Ortiz | — | Cincinnati Reds | Cincinnati Reds signed C Jose Ortiz. |
| Jul 12, 2012 | Signed | Matt Kimbrel | — | Atlanta Braves | Atlanta Braves signed RHP Matt Kimbrel. |
| Jul 12, 2012 | Signed as free agent | Juan Paniagua | — | Chicago Cubs | Chicago Cubs signed free agent RHP Juan Paniagua to a minor league contract. |
| Jul 12, 2012 | Signed as free agent | Lewis Thorpe | — | Minnesota Twins | Minnesota Twins signed free agent LHP Lewis Thorpe to a minor league contract. |
| Jul 12, 2012 | Signed as free agent | Alejandro Flores | — | Atlanta Braves | Atlanta Braves signed free agent C Alejandro Flores to a minor league contract. |
| Jul 11, 2012 | Signed as free agent | Unnamed | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent OF Michael DeLaCruz to a minor league contract. |
| Jul 11, 2012 | Signed | Albert Almora Jr. | — | Chicago Cubs | Chicago Cubs signed OF Albert Almora. |
| Jul 11, 2012 | Released | Brian Fuentes | — | Athletics | Oakland Athletics released LHP Brian Fuentes. |
| Jul 11, 2012 | Signed | Carson Goldsmith | — | Minnesota Twins | Minnesota Twins signed RHP Carson Goldsmith. |
| Jul 11, 2012 | Signed | Logan Ehlers | — | Detroit Tigers | Detroit Tigers signed LHP Logan Ehlers. |
| Jul 11, 2012 | Signed as free agent | Xavier Paul | — | Cincinnati Reds | Cincinnati Reds signed free agent OF Xavier Paul to a minor league contract. |
| Jul 11, 2012 | Signed as free agent | Scott Carroll | — | Chicago White Sox | Chicago White Sox signed free agent RHP Scott Carroll to a minor league contract. |
| Jul 11, 2012 | Signed as free agent | Michael Lee | — | Atlanta Braves | Atlanta Braves signed free agent RHP Michael Lee to a minor league contract. |
| Jul 11, 2012 | Signed as free agent | Matt Lujan | — | San Francisco Giants | San Francisco Giants signed free agent LHP Matthew Lujan to a minor league contract. |
| Jul 11, 2012 | Signed as free agent | Tyler Hollick | — | San Francisco Giants | San Francisco Giants signed free agent OF Tyler Hollick to a minor league contract. |
| Jul 11, 2012 | Signed | Derrick Bleeker | — | Baltimore Orioles | Baltimore Orioles signed OF Derrick Bleeker. |
| Jul 11, 2012 | Signed | Kurt Heyer | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Kurt Heyer. |
| Jul 11, 2012 | Signed as free agent | Unnamed | — | Cleveland Guardians | Cleveland Indians signed free agent D.J. Brown. |
| Jul 10, 2012 | Signed | Thomas White | — | Cleveland Guardians | Cleveland Indians signed RHP Thomas White. |
| Jul 10, 2012 | Signed | Benny Suarez | — | Cleveland Guardians | Cleveland Indians signed RHP Benny Suarez. |
| Jul 10, 2012 | Signed | Matt Price | — | Baltimore Orioles | Baltimore Orioles signed RHP Matt Price. |
| Jul 10, 2012 | Signed | Logan Taylor | — | New York Mets | New York Mets signed RHP Logan Taylor. |
| Jul 10, 2012 | Signed | Travis Huber | — | Minnesota Twins | Minnesota Twins signed RHP Travis Huber. |
| Jul 10, 2012 | Signed | Taylor Hawkins | — | Tampa Bay Rays | Tampa Bay Rays signed C Taylor Hawkins. |
| Jul 10, 2012 | Signed | Ryan Borucki | — | Toronto Blue Jays | Toronto Blue Jays signed LHP Ryan Borucki. |
| Jul 10, 2012 | Signed as free agent | Jose Diaz | — | New York Yankees | New York Yankees signed free agent LHP Jose Diaz to a minor league contract. |
| Jul 10, 2012 | Signed as free agent | Yosmer Leal | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Yosmer Leal to a minor league contract. |
| Jul 10, 2012 | Signed as free agent | Michael De La Cruz | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent OF Michael De La Cruz to a minor league contract. |
| Jul 10, 2012 | Signed as free agent | Sergio Alcántara | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent SS Sergio Alcantara to a minor league contract. |
| Jul 9, 2012 | Signed | Sammy Ayala | — | Chicago White Sox | Chicago White Sox signed C Sammy Ayala. |
| Jul 9, 2012 | Signed as free agent | Edwin Gomez | — | Houston Astros | Houston Astros signed free agent OF Edwin Gomez to a minor league contract. |
| Jul 9, 2012 | Signed | Branden Kline | — | Baltimore Orioles | Baltimore Orioles signed RHP Branden Kline. |
| Jul 9, 2012 | Signed | Cody Keefer | — | Miami Marlins | Miami Marlins signed OF Cody Keefer. |
| Jul 9, 2012 | Signed | Yency Almonte | — | Los Angeles Angels | Los Angeles Angels signed Yency Almonte. |
| Jul 9, 2012 | Signed as free agent | Jon Link | — | Miami Marlins | Miami Marlins signed free agent RHP Jon Link to a minor league contract. |
| Jul 9, 2012 | Signed | Will Dupont | — | Toronto Blue Jays | Toronto Blue Jays signed 2B Will Dupont. |
| Jul 9, 2012 | Signed as free agent | Jhon Alvarez | — | Minnesota Twins | Minnesota Twins signed free agent C Jhonathan Alvarez to a minor league contract. |
| Jul 9, 2012 | Signed as free agent | Rainis Silva | — | Minnesota Twins | Minnesota Twins signed free agent C Rainis Silva to a minor league contract. |
| Jul 9, 2012 | Signed as free agent | Antonio Tovar | — | Minnesota Twins | Minnesota Twins signed free agent C Antonio Tovar to a minor league contract. |
| Jul 8, 2012 | Signed | Austin Fairchild | — | Kansas City Royals | Kansas City Royals signed LHP Austin Fairchild. |
| Jul 7, 2012 | Signed as free agent | Chris Curley | — | Chicago White Sox | Chicago White Sox signed free agent 3B Chris Curley to a minor league contract. |
| Jul 7, 2012 | Signed as free agent | Mike MacDonald | — | Boston Red Sox | Boston Red Sox signed free agent RHP Mike MacDonald to a minor league contract. |
| Jul 7, 2012 | Signed as free agent | Ashley Graeter | — | Colorado Rockies | Colorado Rockies signed free agent SS Ashley Graeter to a minor league contract. |
| Jul 7, 2012 | Signed as free agent | Leudy Garcia | — | Toronto Blue Jays | Toronto Blue Jays signed free agent OF Leudy Garcia to a minor league contract. |
| Jul 7, 2012 | Signed as free agent | Chris Jakubauskas | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Chris Jakubauskas to a minor league contract. |
| Jul 7, 2012 | Signed as free agent | Chris Thomas | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Chris Thomas to a minor league contract. |
| Jul 7, 2012 | Signed | Josh Almonte | — | Toronto Blue Jays | Toronto Blue Jays signed OF Josh Almonte. |
| Jul 7, 2012 | Signed as free agent | José Castillo | — | Tampa Bay Rays | Tampa Bay Rays signed free agent Jose Castillo. |
| Jul 7, 2012 | Signed as free agent | Manuel Castillo | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Manuel Castillo to a minor league contract. |
| Jul 7, 2012 | Signed as free agent | Robert Mullen | — | Athletics | Oakland Athletics signed free agent C Robert Mullen to a minor league contract. |
| Jul 7, 2012 | Signed as free agent | Julio Pinto | — | Kansas City Royals | Kansas City Royals signed free agent RHP Julio Pinto to a minor league contract. |
| Jul 7, 2012 | Signed as free agent | Junior Reyes | — | Kansas City Royals | Kansas City Royals signed free agent LHP Junior Reyes to a minor league contract. |
| Jul 7, 2012 | Signed as free agent | Samir Dueñez | — | Kansas City Royals | Kansas City Royals signed free agent 1B Samir Duenez to a minor league contract. |
| Jul 6, 2012 | Signed | Nathan DeSouza | — | Toronto Blue Jays | Toronto Blue Jays signed OF Nathan DeSouza. |
| Jul 6, 2012 | Signed | Daniel Devonshire | — | Toronto Blue Jays | Toronto Blue Jays signed 1B Daniel Devonshire. |
| Jul 6, 2012 | Signed as free agent | Clayton Tanner | — | San Francisco Giants | San Francisco Giants signed free agent LHP Clayton Tanner to a minor league contract. |
| Jul 6, 2012 | Signed | Rob Refsnyder | — | New York Yankees | New York Yankees signed OF Robert Refsnyder. |
| Jul 6, 2012 | Signed as free agent | Niklas Stephenson | — | Kansas City Royals | Kansas City Royals signed free agent RHP Niklas Stephenson to a minor league contract. |
| Jul 6, 2012 | Signed | Brady Lail | — | New York Yankees | New York Yankees signed RHP Brady Lail. |
| Jul 5, 2012 | Signed as free agent | Brad Davis | — | Miami Marlins | Miami Marlins signed free agent C Brad Davis to a minor league contract. |
| Jul 5, 2012 | Signed as free agent | Dustin Umberger | — | Chicago White Sox | Chicago White Sox signed free agent RHP Dustin Umberger to a minor league contract. |
| Jul 5, 2012 | Released | Humberto Quintero | — | Kansas City Royals | Kansas City Royals released C Humberto Quintero. |
| Jul 5, 2012 | Signed | Paco Rodríguez | — | Los Angeles Dodgers | Los Angeles Dodgers signed LHP Paco Rodriguez. |
| Jul 5, 2012 | Signed | Christian Walker | — | Baltimore Orioles | Baltimore Orioles signed IF Christian Walker. |
| Jul 5, 2012 | Signed as free agent | Edgardo Rivera | — | Milwaukee Brewers | Milwaukee Brewers signed free agent Edgardo Rivera. |
| Jul 5, 2012 | Signed as free agent | Joe Andrade | — | Milwaukee Brewers | Milwaukee Brewers signed free agent C Joe Andrade to a minor league contract. |
| Jul 5, 2012 | Signed as free agent | E.J. Encinosa | — | San Francisco Giants | San Francisco Giants signed free agent RHP Eduardo Encinosa to a minor league contract. |
| Jul 5, 2012 | Signed as free agent | Lance Day | — | Houston Astros | Houston Astros signed free agent RHP Lance Day to a minor league contract. |
| Jul 5, 2012 | Signed | Damien Magnifico | — | Milwaukee Brewers | Milwaukee Brewers signed RHP Damien Magnifico. |
| Jul 5, 2012 | Signed | Edgardo Rivera | — | Milwaukee Brewers | Milwaukee Brewers signed OF Edgardo Rivera. |
| Jul 5, 2012 | Trade | Carlos Lee | Houston Astros | Miami Marlins | Houston Astros traded cash and 1B Carlos Lee to Miami Marlins for Matt Dominguez and LHP Rob Rasmussen. |
| Jul 4, 2012 | Signed | Chris O'Grady | — | Los Angeles Angels | Los Angeles Angels signed LHP Chris O'Grady. |
| Jul 4, 2012 | Signed | Alex D. Mejia | — | St. Louis Cardinals | St. Louis Cardinals signed SS Alex Mejia. |
| Jul 4, 2012 | Signed | Jeff Gelalich | — | Cincinnati Reds | Cincinnati Reds signed OF Jeff Gelalich. |
| Jul 4, 2012 | Signed | Seth Mejias-Brean | — | Cincinnati Reds | Cincinnati Reds signed 3B Seth Mejias-Brean. |
| Jul 4, 2012 | Signed as free agent | Zach Sterling | — | Seattle Mariners | Seattle Mariners signed free agent RHP Zach Sterling to a minor league contract. |
| Jul 4, 2012 | Signed as free agent | Zac Shepherd | — | Detroit Tigers | Detroit Tigers signed free agent Zach Shepherd. |
| Jul 4, 2012 | Signed as free agent | Rodrigo Orozco | — | Toronto Blue Jays | Toronto Blue Jays signed free agent 2B Rodrigo Orozco to a minor league contract. |
| Jul 4, 2012 | Signed | Pablo López | — | Seattle Mariners | Seattle Mariners signed RHP Pablo Lopez. |
| Jul 3, 2012 | Signed | Jake Pintar | — | Baltimore Orioles | Baltimore Orioles signed RHP Jake Pintar. |
| Jul 3, 2012 | Signed as free agent | Jeff Baisley | — | Chicago White Sox | Chicago White Sox signed free agent 3B Jeff Baisley to a minor league contract. |
| Jul 3, 2012 | Signed as free agent | Unnamed | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 3B Julio Delacruz to a minor league contract. |
| Jul 3, 2012 | Signed | Marcus Stroman | — | Toronto Blue Jays | Toronto Blue Jays signed RHP Marcus Stroman. |
| Jul 3, 2012 | Signed | Ryan McNeil | — | Chicago Cubs | Chicago Cubs signed RHP Ryan McNeil. |
| Jul 3, 2012 | Signed | Trey Lang | — | Chicago Cubs | Chicago Cubs signed RHP Trey Lang. |
| Jul 3, 2012 | Signed | Justin Amlung | — | Chicago Cubs | Chicago Cubs signed RHP Justin Amlung. |
| Jul 3, 2012 | Signed | Jasvir Rakkar | — | Chicago Cubs | Chicago Cubs signed RHP Jasvir Rakkar. |
| Jul 3, 2012 | Released | Bobby Jenks | — | Boston Red Sox | Boston Red Sox released RHP Bobby Jenks. |
| Jul 3, 2012 | Signed as free agent | Luis Payano | — | Houston Astros | Houston Astros signed free agent OF Luis Payano to a minor league contract. |
| Jul 3, 2012 | Signed as free agent | Kristian Trompiz | — | Houston Astros | Houston Astros signed free agent SS Kristian Trompiz to a minor league contract. |
| Jul 3, 2012 | Signed as free agent | Victor Tavarez | — | Houston Astros | Houston Astros signed free agent 1B Victor Tavarez to a minor league contract. |
| Jul 3, 2012 | Signed | Walker Weickel | — | San Diego Padres | San Diego Padres signed RHP Walker Weickel. |
| Jul 3, 2012 | Signed | Walker Lockett | — | San Diego Padres | San Diego Padres signed RHP Andrew Lockett. |
| Jul 3, 2012 | Signed | Corey Kimber | — | San Diego Padres | San Diego Padres signed RHP Corey Kimber. |
| Jul 3, 2012 | Signed | Kyle Ottoson | — | San Diego Padres | San Diego Padres signed LHP Kyle Ottoson. |
| Jul 3, 2012 | Released | Will Ohman | — | Chicago White Sox | Chicago White Sox released LHP Will Ohman. |
| Jul 3, 2012 | Released | Matt Antonelli | — | New York Yankees | New York Yankees released 2B Matt Antonelli. |
| Jul 3, 2012 | Signed | Damion Smith | — | Arizona Diamondbacks | Arizona Diamondbacks signed OF Damion Smith. |
| Jul 3, 2012 | Signed | David Starn | — | Atlanta Braves | Atlanta Braves signed LHP David Starn. |
| Jul 3, 2012 | Signed as free agent | Gregori Titts | — | Boston Red Sox | Boston Red Sox signed free agent OF Gregori Titts to a minor league contract. |
| Jul 3, 2012 | Signed | Devon Travis | — | Detroit Tigers | Detroit Tigers signed 2B Devon Travis. |
| Jul 3, 2012 | Signed | Joey Rickard | — | Tampa Bay Rays | Tampa Bay Rays signed OF Joey Rickard. |
| Jul 3, 2012 | Signed as free agent | Gabe Suarez | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent OF Gabe Suarez to a minor league contract. |
| Jul 3, 2012 | Signed | Jesus Castillo | — | Houston Astros | Houston Astros signed RHP Jesus Castillo. |
| Jul 3, 2012 | Signed as free agent | Angelo Almonte | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LHP Angelo Almonte to a minor league contract. |
| Jul 3, 2012 | Signed as free agent | Hamly Suero | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Hamly Suero to a minor league contract. |
| Jul 3, 2012 | Signed as free agent | Richard Urena | — | Toronto Blue Jays | Toronto Blue Jays signed free agent SS Richard Urena to a minor league contract. |
| Jul 3, 2012 | Signed as free agent | Luis Barrera | — | Athletics | Oakland Athletics signed free agent LF Luis Barrera to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Edmundo Sosa | — | St. Louis Cardinals | St. Louis Cardinals signed free agent SS Edmundo Sosa to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Joshua Lopez | — | St. Louis Cardinals | St. Louis Cardinals signed free agent C Joshua Lopez to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Luis Bandes | — | St. Louis Cardinals | St. Louis Cardinals signed free agent OF Luis Bandes to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Franklin Correa | — | New York Mets | New York Mets signed free agent 2B Franklin Correa to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Miguel Patino | — | New York Mets | New York Mets signed free agent SS Miguel Patino to a minor league contract. |
| Jul 2, 2012 | Signed | Tyler Gaffney | — | Pittsburgh Pirates | Pittsburgh Pirates signed OF Tyler Gaffney. |
| Jul 2, 2012 | Signed as free agent | Julian Leon | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent C Julian Leon to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Lenix Osuna | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Lenix Osuna to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Victor González | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LHP Victor Gonzalez to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Willian Soto | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP William Soto to a minor league contract. |
| Jul 2, 2012 | Signed | Mike Zunino | — | Seattle Mariners | Seattle Mariners signed C Mike Zunino. |
| Jul 2, 2012 | Signed as free agent | Michael Albaladejo | — | Washington Nationals | Washington Nationals signed free agent C Michael Albaladejo to a minor league contract. |
| Jul 2, 2012 | Signed | Peter O'Brien | — | New York Yankees | New York Yankees signed C Peter O'Brien. |
| Jul 2, 2012 | Signed as free agent | Tim Sexton | — | Colorado Rockies | Colorado Rockies signed free agent RHP Tim Sexton to a minor league contract. |
| Jul 2, 2012 | Signed | Matt Flemer | — | Colorado Rockies | Colorado Rockies signed RHP Matt Flemer. |
| Jul 2, 2012 | Signed as free agent | Francisco Rosario | — | New York Yankees | New York Yankees signed free agent SS Francisco Rosario to a minor league contract. |
| Jul 2, 2012 | Signed | Michael Roth | — | Los Angeles Angels | Los Angeles Angels signed LHP Michael Roth. |
| Jul 2, 2012 | Signed | Edward Sappelt | — | Miami Marlins | Miami Marlins signed OF Edward Sappelt. |
| Jul 2, 2012 | Signed | Dayton Dawe | — | New York Yankees | New York Yankees signed RHP Dayton Dawe. |
| Jul 2, 2012 | Signed | Carlos Belen | — | San Diego Padres | San Diego Padres signed 3B Carlos Belen. |
| Jul 2, 2012 | Signed as free agent | Gustavo Cabrera | — | San Francisco Giants | San Francisco Giants signed free agent OF Gustavo Cabrera to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Deivy Mendez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Deivy Mendez to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | José Mujica | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Jose Mujica to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Willerker Isava | — | Philadelphia Phillies | Philadelphia Phillies signed free agent SS Willerker Isava to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Gregori Rivero | — | Philadelphia Phillies | Philadelphia Phillies signed free agent C Gregori Rivero to a minor league contract. |
| Jul 2, 2012 | Signed | Grofi Cruz | — | Cleveland Guardians | Cleveland Indians signed SS Grofi Cruz. |
| Jul 2, 2012 | Signed as free agent | Julian Fernández | — | Colorado Rockies | Colorado Rockies signed free agent RHP Julian Fernandez to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Javy Guerra | — | Boston Red Sox | Boston Red Sox signed free agent SS Javier Guerra to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Amaurys Minier | — | Minnesota Twins | Minnesota Twins signed free agent SS Amaurys Minier to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Fernery Ozuna | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent 2B Fernery Ozuna to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Yoiber Marquina | — | Cleveland Guardians | Cleveland Indians signed free agent C Yoiber Marquina to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Domingo Leyba | — | Detroit Tigers | Detroit Tigers signed free agent 2B Domingo Leyba to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Willy Adames | — | Detroit Tigers | Detroit Tigers signed free agent SS Willy Adames to a minor league contract. |
| Jul 2, 2012 | Signed as free agent | Francisco Mejía | — | Cleveland Guardians | Cleveland Indians signed free agent C Francisco Mejia to a minor league contract. |
| Jul 1, 2012 | Trade | Kyle Simon | Baltimore Orioles | Philadelphia Phillies | Philadelphia Phillies traded DH Jim Thome to Baltimore Orioles for C Gabriel Lino and RHP Kyle Simon. |
| Jul 1, 2012 | Signed as free agent | Ben Sheets | — | Atlanta Braves | Atlanta Braves signed free agent RHP Ben Sheets to a minor league contract. |
| Jul 1, 2012 | Trade | Chad Qualls | Philadelphia Phillies | New York Yankees | Philadelphia Phillies traded RHP Chad Qualls to New York Yankees for cash. |
| Jul 1, 2012 | Signed | Chase De Jong | — | Toronto Blue Jays | Toronto Blue Jays signed RHP Chase DeJong. |
| Jul 1, 2012 | Signed as free agent | Max Peterson | — | Chicago White Sox | Chicago White Sox signed free agent LHP Max Peterson to a minor league contract. |
| Jul 1, 2012 | Signed as free agent | Ben Tomchick | — | Kansas City Royals | Kansas City Royals signed free agent RHP Ben Tomchick to a minor league contract. |
| Jul 1, 2012 | Signed as free agent | Bobby Fisher-Brown | — | Kansas City Royals | Kansas City Royals signed free agent OF Bobby Fisher-Brown to a minor league contract. |
| Jul 1, 2012 | Signed as free agent | Diory Paulino | — | Boston Red Sox | Boston Red Sox signed free agent SS Diory Paulino to a minor league contract. |
| Jul 1, 2012 | Signed as free agent | Omar Luis | — | New York Yankees | New York Yankees signed free agent LHP Omar Luis to a minor league contract. |
| Jul 1, 2012 | Signed as free agent | Jhoan Herrera | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 3B Jhoan Herrera to a minor league contract. |
| Jul 1, 2012 | Signed as free agent | Dario Agrazal | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Dario Agrazal to a minor league contract. |
| Jun 30, 2012 | Signed as free agent | Jorge Soler | — | Chicago Cubs | Chicago Cubs signed free agent RF Jorge Soler. |
| Jun 30, 2012 | Signed | Corey Seager | — | Los Angeles Dodgers | Los Angeles Dodgers signed SS Corey Seager. |
| Jun 30, 2012 | Signed as free agent | Greg Larson | — | Boston Red Sox | Boston Red Sox signed free agent RHP Greg Larson to a minor league contract. |
| Jun 30, 2012 | Signed as free agent | Joey Housey | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Joey Housey to a minor league contract. |
| Jun 30, 2012 | Signed | Hudson Randall | — | Detroit Tigers | Detroit Tigers signed RHP Hudson Randall. |
| Jun 30, 2012 | Signed as free agent | Chris Hanna | — | Chicago White Sox | Chicago White Sox signed free agent LHP Chris Hanna to a minor league contract. |
| Jun 30, 2012 | Signed as free agent | Erick Mejia | — | Seattle Mariners | Seattle Mariners signed free agent SS Erick Mejia to a minor league contract. |
| Jun 30, 2012 | Signed as free agent | Pablo Guzman | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Pablo Guzman to a minor league contract. |
| Jun 29, 2012 | Signed as free agent | Yasiel Puig | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent OF Yasiel Puig. |
| Jun 29, 2012 | Signed as free agent | Cameron Copping | — | Seattle Mariners | Seattle Mariners signed free agent RHP Cameron Copping to a minor league contract. |
| Jun 29, 2012 | Signed | Sherman Johnson | — | Los Angeles Angels | Los Angeles Angels signed 3B Sherman Johnson. |
| Jun 29, 2012 | Signed as free agent | Shane Lindsay | — | Chicago White Sox | Chicago White Sox signed free agent RHP Shane Lindsay to a minor league contract. |
| Jun 29, 2012 | Signed as free agent | Joe Karlik | — | Kansas City Royals | Kansas City Royals signed free agent RHP Joe Karlik to a minor league contract. |
| Jun 29, 2012 | Signed | Matt Reynolds | — | New York Mets | New York Mets signed 3B Matt Reynolds. |
| Jun 29, 2012 | Signed | James Ramsey | — | St. Louis Cardinals | St. Louis Cardinals signed OF James Ramsey. |
| Jun 29, 2012 | Signed as free agent | Beau Jones | — | Athletics | Oakland Athletics signed free agent LHP Beau Jones to a minor league contract. |
| Jun 29, 2012 | Signed | Chipper Smith | — | Miami Marlins | Miami Marlins signed LHP Chipper Smith. |
| Jun 29, 2012 | Signed as free agent | Hector Roa | — | Houston Astros | Houston Astros signed free agent OF Hector Roa to a minor league contract. |
| Jun 29, 2012 | Signed | Nellie Rodriguez | — | Cleveland Guardians | Cleveland Indians signed C Nellie Rodriguez. |
| Jun 29, 2012 | Signed | Zach Brill | — | Texas Rangers | Texas Rangers signed LHP Zach Brill. |
| Jun 29, 2012 | Signed as free agent | Yonny Chirinos | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Yonny Chirinos to a minor league contract. |
| Jun 28, 2012 | Signed | Nick Hamilton | — | Cleveland Guardians | Cleveland Indians signed SS Nick Hamilton. |
| Jun 28, 2012 | Signed | Jimmy Rider | — | Pittsburgh Pirates | Pittsburgh Pirates signed 2B Jimmy Rider. |
| Jun 28, 2012 | Signed as free agent | Andy LaRoche | — | Boston Red Sox | Boston Red Sox signed free agent 3B Andy LaRoche to a minor league contract. |
| Jun 28, 2012 | Signed | Estevan Gonzalez | — | Toronto Blue Jays | Toronto Blue Jays signed LHP Alonzo Gonzalez. |
| Jun 28, 2012 | Signed | Tim Carver | — | Philadelphia Phillies | Philadelphia Phillies signed SS Tim Carver. |
| Jun 28, 2012 | Signed as free agent | Ricardo Lizcano | — | St. Louis Cardinals | St. Louis Cardinals signed free agent C Ricardo Lizcano to a minor league contract. |
| Jun 28, 2012 | Signed | Cristopher Ynoa | — | Miami Marlins | Miami Marlins signed SS Cristopher Ynoa. |
| Jun 28, 2012 | Signed as free agent | Trevor Brown | — | San Francisco Giants | San Francisco Giants signed free agent C Trevor Brown to a minor league contract. |
| Jun 28, 2012 | Signed | Beau Amaral | — | Cincinnati Reds | Cincinnati Reds signed OF Beau Amaral. |
| Jun 28, 2012 | Signed | Hunter Scantling | — | Detroit Tigers | Detroit Tigers signed RHP Hunter Scantling. |
| Jun 28, 2012 | Signed | Jeremy Kivel | — | Cincinnati Reds | Cincinnati Reds signed RHP Jeremy Kivel. |
| Jun 28, 2012 | Signed | Fernelys Sanchez | — | Atlanta Braves | Atlanta Braves signed OF Fernelys Sanchez. |
| Jun 27, 2012 | Trade | Shairon Martis | Pittsburgh Pirates | Minnesota Twins | Pittsburgh Pirates traded RHP Shairon Martis to Minnesota Twins. |
| Jun 27, 2012 | Signed | Brian Johnson | — | Boston Red Sox | Boston Red Sox signed LHP Brian Johnson. |
| Jun 27, 2012 | Signed | Austin Maddox | — | Boston Red Sox | Boston Red Sox signed RHP Austin Maddox. |
| Jun 27, 2012 | Signed | Brett Mooneyham | — | Washington Nationals | Washington Nationals signed LHP Brett Mooneyham. |
| Jun 27, 2012 | Signed as free agent | Jamie Moyer | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Jamie Moyer to a minor league contract. |
| Jun 27, 2012 | Signed | DJ Baxendale | — | Minnesota Twins | Minnesota Twins signed RHP DJ Baxendale. |
| Jun 27, 2012 | Signed | Christian Powell | — | Minnesota Twins | Minnesota Twins signed RHP Christian Powell. |
| Jun 27, 2012 | Signed as free agent | Jesus Baldayaque | — | Chicago Cubs | Chicago Cubs signed free agent RHP Jesus Baldayaque to a minor league contract. |
| Jun 27, 2012 | Signed | Sam Bates | — | Kansas City Royals | Kansas City Royals signed OF Sam Bates. |
| Jun 26, 2012 | Released | Kosuke Fukudome | — | Chicago White Sox | Chicago White Sox released RF Kosuke Fukudome. |
| Jun 26, 2012 | Signed | Nolan Fontana | — | Houston Astros | Houston Astros signed SS Nolan Fontana. |
| Jun 26, 2012 | Signed | Travis Jankowski | — | San Diego Padres | San Diego Padres signed OF Travis Jankowski. |
| Jun 26, 2012 | Signed as free agent | Yerison Pena | — | Detroit Tigers | Detroit Tigers signed free agent SS Yerison Pena to a minor league contract. |
| Jun 26, 2012 | Signed | Maxx Tissenbaum | — | San Diego Padres | San Diego Padres signed SS Maxx Tissenbaum. |
| Jun 26, 2012 | Signed | Patrick Palmeiro | — | Chicago White Sox | Chicago White Sox signed 3B Patrick Palmeiro. |
| Jun 26, 2012 | Signed | Steven Okert | — | San Francisco Giants | San Francisco Giants signed LHP Steven Okert. |
| Jun 26, 2012 | Signed | Trey Pascazi | — | Toronto Blue Jays | Toronto Blue Jays signed SS Trey Pascazi. |
| Jun 26, 2012 | Signed | Zak Edgington | — | San Francisco Giants | San Francisco Giants signed LHP Zak Edgington. |
| Jun 26, 2012 | Signed as free agent | John Polonius | — | San Francisco Giants | San Francisco Giants signed free agent SS John Polonius to a minor league contract. |
| Jun 25, 2012 | Trade | Brent Lillibridge | Chicago White Sox | Boston Red Sox | Boston Red Sox traded 3B Kevin Youkilis to Chicago White Sox for CF Brent Lillibridge and RHP Zach Stewart. |
| Jun 25, 2012 | Signed | Pat Cantwell | — | Cleveland Guardians | Cleveland Indians signed Pat Cantwell. |
| Jun 25, 2012 | Signed | Nick Travieso | — | Cincinnati Reds | Cincinnati Reds signed RHP Nick Travieso. |
| Jun 25, 2012 | Signed | Rio Ruiz | — | Houston Astros | Houston Astros signed 3B Rio Ruiz. |
| Jun 25, 2012 | Signed as free agent | Fabian Williamson | — | Atlanta Braves | Atlanta Braves signed free agent LHP Fabian Williamson to a minor league contract. |
| Jun 25, 2012 | Released | Brad Lidge | — | Washington Nationals | Washington Nationals released RHP Brad Lidge. |
| Jun 25, 2012 | Signed as free agent | Bobby Stevens | — | Atlanta Braves | Atlanta Braves signed free agent 2B Bobby Stevens to a minor league contract. |
| Jun 25, 2012 | Signed | James Campbell | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP James Campbell. |
| Jun 25, 2012 | Signed | David Bote | — | Chicago Cubs | Chicago Cubs signed SS David Bote. |
| Jun 25, 2012 | Signed as free agent | Chance Ross | — | Los Angeles Angels | Los Angeles Angels signed free agent 3B Chance Ross to a minor league contract. |
| Jun 25, 2012 | Signed | Max Foody | — | St. Louis Cardinals | St. Louis Cardinals signed LHP Max Foody. |
| Jun 25, 2012 | Signed | Drew Longley | — | Detroit Tigers | Detroit Tigers signed C Drew Longley. |
| Jun 25, 2012 | Signed | Jake Stewart | — | Detroit Tigers | Detroit Tigers signed OF Jake Stewart. |
| Jun 25, 2012 | Signed | Josh Turley | — | Detroit Tigers | Detroit Tigers signed LHP Josh Turley. |
| Jun 25, 2012 | Signed | Robert Benincasa | — | Washington Nationals | Washington Nationals signed RHP Robert Benincasa. |
| Jun 25, 2012 | Signed | Jayce Boyd | — | New York Mets | New York Mets signed 1B Jayce Boyd. |
| Jun 25, 2012 | Signed | Juan C Gutierrez | — | Kansas City Royals | Kansas City Royals signed Juan C Gutierrez. |
| Jun 25, 2012 | Signed | Robert Martinez | — | Athletics | Oakland Athletics signed OF Robert Martinez. |
| Jun 24, 2012 | Signed | Mike Meyers | — | Boston Red Sox | Boston Red Sox signed SS Mike Meyers. |
| Jun 24, 2012 | Signed | Keaton Briscoe | — | Boston Red Sox | Boston Red Sox signed 2B Keaton Briscoe. |
| Jun 24, 2012 | Signed as free agent | Michael Lang | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent OF Michael Lang. |
| Jun 24, 2012 | Signed | Kyle Von Tungeln | — | Colorado Rockies | Colorado Rockies signed OF Kyle Von Tungeln. |
| Jun 24, 2012 | Signed as free agent | Donovan Drake | — | Atlanta Braves | Atlanta Braves signed free agent RHP Donovan Drake to a minor league contract. |
| Jun 24, 2012 | Signed as free agent | Jon Meloan | — | New York Yankees | New York Yankees signed free agent RHP Jon Meloan to a minor league contract. |
| Jun 24, 2012 | Signed | Lucas Herbst | — | Baltimore Orioles | Baltimore Orioles signed OF Lucas Herbst. |
| Jun 24, 2012 | Signed as free agent | Anthony York | — | Chicago Cubs | Chicago Cubs signed free agent RHP Anthony York to a minor league contract. |
| Jun 24, 2012 | Signed | Preston Gainey | — | Milwaukee Brewers | Milwaukee Brewers signed RHP Preston Gainey. |
| Jun 24, 2012 | Signed | Willie Carmona | — | Philadelphia Phillies | Philadelphia Phillies signed SS Willie Carmona. |
| Jun 24, 2012 | Signed | Drew Anderson | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Drew Anderson. |
| Jun 24, 2012 | Signed as free agent | Ryan Fasano | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Ryan Fasano to a minor league contract. |
| Jun 24, 2012 | Signed | Bijan Rademacher | — | Chicago Cubs | Chicago Cubs signed OF Bijan Rademacher. |
| Jun 24, 2012 | Signed | Tyler Smith | — | Texas Rangers | Texas Rangers signed RHP Tyler Smith. |
| Jun 23, 2012 | Signed as free agent | Jason Urquidez | — | Boston Red Sox | Boston Red Sox signed free agent RHP Jason Urquidez to a minor league contract. |
| Jun 23, 2012 | Signed | Tyler DeLoach | — | Los Angeles Angels | Los Angeles Angels signed LHP Tyler DeLoach. |
| Jun 23, 2012 | Signed as free agent | Alex De La Cruz | — | Texas Rangers | Texas Rangers signed free agent RHP Alex De La Cruz to a minor league contract. |
| Jun 23, 2012 | Signed | Spencer Edwards | — | Tampa Bay Rays | Tampa Bay Rays signed SS Spencer Edwards. |
| Jun 23, 2012 | Signed as free agent | Adrian Rivero | — | Atlanta Braves | Atlanta Braves signed free agent LHP Adrian Rivero to a minor league contract. |
| Jun 23, 2012 | Signed | Brandon Love | — | Los Angeles Angels | Los Angeles Angels signed LHP Brandon Love. |
| Jun 23, 2012 | Signed | Albert Romano | — | Los Angeles Dodgers | Los Angeles Dodgers signed SS Albert Romano. |
| Jun 22, 2012 | Signed as free agent | Livan Hernandez | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Livan Hernandez. |
| Jun 22, 2012 | Signed as free agent | Cesar Carrillo | — | Detroit Tigers | Detroit Tigers signed free agent RHP Cesar Carrillo to a minor league contract. |
| Jun 22, 2012 | Signed as free agent | Juruengelo Tielman | — | Atlanta Braves | Atlanta Braves signed free agent 3B Juruengelo Tielman to a minor league contract. |
| Jun 22, 2012 | Signed as free agent | Jose Ramirez | — | Minnesota Twins | Minnesota Twins signed free agent RHP Jose Ramirez to a minor league contract. |
| Jun 22, 2012 | Signed as free agent | Joe Sever | — | Cleveland Guardians | Cleveland Indians signed free agent 3B Joe Sever to a minor league contract. |
| Jun 22, 2012 | Signed | Andrew Harrison | — | Detroit Tigers | Detroit Tigers signed RHP Andrew Harrison. |
| Jun 22, 2012 | Signed | Kris Richards | — | Baltimore Orioles | Baltimore Orioles signed SS Kris Richards. |
| Jun 22, 2012 | Signed | Nathan Mikolas | — | New York Yankees | New York Yankees signed OF Nathan Mikolas. |
| Jun 22, 2012 | Signed | Tyler Heineman | — | Houston Astros | Houston Astros signed C Tyler Heineman. |
| Jun 22, 2012 | Signed as free agent | Manuel Gonzalez | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Manuel Gonzalez to a minor league contract. |
| Jun 22, 2012 | Signed | Daniel Pigott | — | Cincinnati Reds | Cincinnati Reds signed OF Daniel Pigott. |
| Jun 22, 2012 | Signed | Ryan Bores | — | Texas Rangers | Texas Rangers signed RHP Ryan Bores. |
| Jun 22, 2012 | Signed | David Lyon | — | Texas Rangers | Texas Rangers signed C David Lyon. |
| Jun 22, 2012 | Signed | Chris Flexen | — | New York Mets | New York Mets signed RHP Chris Flexen. |
| Jun 21, 2012 | Signed | Zach Green | — | Philadelphia Phillies | Philadelphia Phillies signed SS Zach Green. |
| Jun 21, 2012 | Trade | Sean O'Sullivan | Kansas City Royals | Toronto Blue Jays | Kansas City Royals traded RHP Sean O'Sullivan to Toronto Blue Jays. |
| Jun 21, 2012 | Signed | Joel Galarraga | — | Toronto Blue Jays | Toronto Blue Jays signed C Joel Galarraga. |
| Jun 21, 2012 | Signed as free agent | Matt Nevarez | — | Boston Red Sox | Boston Red Sox signed free agent RHP Matt Nevarez to a minor league contract. |
| Jun 21, 2012 | Signed | J.B. Wendelken | — | Boston Red Sox | Boston Red Sox signed Jeffrey Wendelken. |
| Jun 21, 2012 | Signed as free agent | Matt Fields | — | Kansas City Royals | Kansas City Royals signed free agent 1B Matt Fields to a minor league contract. |
| Jun 21, 2012 | Signed | Scott Griggs | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP Scott Griggs. |
| Jun 21, 2012 | Signed as free agent | Ryne Slack | — | Texas Rangers | Texas Rangers signed free agent LHP Ryne Slack to a minor league contract. |
| Jun 21, 2012 | Signed | Kevin Grendell | — | Baltimore Orioles | Baltimore Orioles signed LHP Kevin Grendell. |
| Jun 21, 2012 | Signed | Josh Hader | — | Baltimore Orioles | Baltimore Orioles signed Josh Hader. |
| Jun 21, 2012 | Signed | Scott Kalush | — | Baltimore Orioles | Baltimore Orioles signed C Scott Kalush. |
| Jun 21, 2012 | Signed | Luc Rennie | — | Baltimore Orioles | Baltimore Orioles signed RHP Luc Rennie. |
| Jun 21, 2012 | Signed | Stephen Johnson | — | San Francisco Giants | San Francisco Giants signed RHP Stephen Johnson. |
| Jun 21, 2012 | Signed as free agent | Jose Chavez | — | Washington Nationals | Washington Nationals signed free agent RHP Jose Chavez to a minor league contract. |
| Jun 21, 2012 | Signed as free agent | Juan Benítez | — | Washington Nationals | Washington Nationals signed free agent RHP Juan Benitez to a minor league contract. |
| Jun 21, 2012 | Signed as free agent | Brad Moss | — | San Francisco Giants | San Francisco Giants signed free agent C Brad Moss to a minor league contract. |
| Jun 20, 2012 | Signed | Deven Marrero | — | Boston Red Sox | Boston Red Sox signed IF Deven Marrero. |
| Jun 20, 2012 | Signed | Joey Curletta | — | Los Angeles Dodgers | Los Angeles Dodgers signed 1B Joey Curletta. |
| Jun 20, 2012 | Signed | Cory Embree | — | Los Angeles Dodgers | Los Angeles Dodgers signed OF Cory Embree. |
| Jun 20, 2012 | Signed | Jordan Hershiser | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP Jordan Hershiser. |
| Jun 20, 2012 | Signed | Paul Hoenecke | — | Los Angeles Dodgers | Los Angeles Dodgers signed 3B Paul Hoenecke. |
| Jun 20, 2012 | Signed | John Sgromolo | — | Los Angeles Dodgers | Los Angeles Dodgers signed 1B John Sgromolo. |
| Jun 20, 2012 | Signed | Jesmuel Valentín | — | Los Angeles Dodgers | Los Angeles Dodgers signed SS Jesmuel Valentin. |
| Jun 20, 2012 | Signed | Jacob Scavuzzo | — | Los Angeles Dodgers | Los Angeles Dodgers signed OF Jacob Scavuzzo. |
| Jun 20, 2012 | Signed as free agent | Brent Leach | — | Atlanta Braves | Atlanta Braves signed free agent LHP Brent Leach to a minor league contract. |
| Jun 20, 2012 | Signed | Kevin McKague | — | Atlanta Braves | Atlanta Braves signed RHP Kevin McKague. |
| Jun 20, 2012 | Signed | Andrew Toles | — | Tampa Bay Rays | Tampa Bay Rays signed OF Andrew Toles. |
| Jun 20, 2012 | Signed | Stephen Branca | — | San Francisco Giants | San Francisco Giants signed SS Stephen Branca. |
| Jun 20, 2012 | Signed | Lex Rutledge | — | Baltimore Orioles | Baltimore Orioles signed LHP Lex Rutledge. |
| Jun 20, 2012 | Signed as free agent | Lucas Rojo | — | Philadelphia Phillies | Philadelphia Phillies signed free agent IF Lucas Rojo to a minor league contract. |
| Jun 20, 2012 | Signed | Luke Bard | — | Minnesota Twins | Minnesota Twins signed RHP Luke Bard. |
| Jun 20, 2012 | Signed as free agent | Braudy Perez | — | New York Yankees | New York Yankees signed free agent RHP Braudy Perez to a minor league contract. |
| Jun 20, 2012 | Signed as free agent | Bryan Munoz | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Bryan Munoz to a minor league contract. |
| Jun 20, 2012 | Signed as free agent | Jose Geraldo | — | Kansas City Royals | Kansas City Royals signed free agent RHP Jose Geraldo to a minor league contract. |
| Jun 20, 2012 | Signed as free agent | Jhonny Mateo | — | Detroit Tigers | Detroit Tigers signed free agent RHP Jhonny Mateo to a minor league contract. |
| Jun 20, 2012 | Signed | Ty Blach | — | San Francisco Giants | San Francisco Giants signed LHP Ty Blach. |
| Jun 20, 2012 | Signed | Carlos Indriago | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Carlos Indriago. |
| Jun 19, 2012 | Signed | Dylan Baker | — | Cleveland Guardians | Cleveland Indians signed RHP Dylan Baker. |
| Jun 19, 2012 | Signed | Josh McAdams | — | Cleveland Guardians | Cleveland Indians signed RF Josh McAdams. |
| Jun 19, 2012 | Signed as free agent | Koyie Hill | — | Washington Nationals | Washington Nationals signed free agent C Koyie Hill to a minor league contract. |
| Jun 19, 2012 | Signed | Willie Eyre | — | Texas Rangers | Texas Rangers signed RHP Willie Eyre. |
| Jun 19, 2012 | Signed | Alex Wood | — | Atlanta Braves | Atlanta Braves signed LHP Alex Wood. |
| Jun 19, 2012 | Signed | David Peterson | — | Atlanta Braves | Atlanta Braves signed RHP David Peterson. |
| Jun 19, 2012 | Signed | Chase Anselment | — | Atlanta Braves | Atlanta Braves signed C Chase Anselment. |
| Jun 19, 2012 | Signed | Ross Heffley | — | Atlanta Braves | Atlanta Braves signed 2B Ross Heffley. |
| Jun 19, 2012 | Signed | Adrian Sampson | — | Pittsburgh Pirates | Pittsburgh Pirates signed RHP Adrian Sampson. |
| Jun 19, 2012 | Signed | D.J. Crumlich | — | Pittsburgh Pirates | Pittsburgh Pirates signed IF D.J. Crumlich. |
| Jun 19, 2012 | Signed | Chris Diaz | — | Pittsburgh Pirates | Pittsburgh Pirates signed SS Chris Diaz. |
| Jun 19, 2012 | Signed | Daniel Robertson | — | Athletics | Oakland Athletics signed SS Daniel Robertson. |
| Jun 19, 2012 | Signed | Matt Olson | — | Athletics | Oakland Athletics signed 1B Matt Olson. |
| Jun 19, 2012 | Signed | Melvin Mercedes | — | Athletics | Oakland Athletics signed SS Melvin Mercedes. |
| Jun 19, 2012 | Signed | Derek De Young | — | Athletics | Oakland Athletics signed RHP Derek De Young. |
| Jun 19, 2012 | Signed | Tyler Johnson | — | Athletics | Oakland Athletics signed RHP Tyler Johnson. |
| Jun 19, 2012 | Signed | Jeremy Baltz | — | San Diego Padres | San Diego Padres signed OF Jeremy Baltz. |
| Jun 19, 2012 | Signed as free agent | Juan Caballero | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Juan Caballero. |
| Jun 19, 2012 | Signed as free agent | David Popkins | — | St. Louis Cardinals | St. Louis Cardinals signed free agent OF David Popkins to a minor league contract. |
| Jun 19, 2012 | Signed | Iseha Conklin | — | Boston Red Sox | Boston Red Sox signed OF Iseha Conklin. |
| Jun 19, 2012 | Signed | Jacob Locker | — | Los Angeles Angels | Los Angeles Angels signed RHP Jacob Locker. |
| Jun 19, 2012 | Signed | Blake Amaral | — | Los Angeles Angels | Los Angeles Angels signed OF Blake Amaral. |
| Jun 19, 2012 | Signed | Nic DellaTorre | — | Los Angeles Angels | Los Angeles Angels signed LHP Nic DellaTorre. |
| Jun 19, 2012 | Signed as free agent | Zach LeBarron | — | Los Angeles Angels | Los Angeles Angels signed free agent LHP Zach LeBarron to a minor league contract. |
| Jun 19, 2012 | Signed as free agent | Kurt Spomer | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Kurt Spomer to a minor league contract. |
| Jun 19, 2012 | Signed | Lucas Moran | — | Cincinnati Reds | Cincinnati Reds signed RHP Luke Moran. |
| Jun 19, 2012 | Signed as free agent | Vaughn Covington | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Vaughn Covington to a minor league contract. |
| Jun 19, 2012 | Signed as free agent | Jonathan Reynoso | — | Cincinnati Reds | Cincinnati Reds signed free agent Jonathan Reynoso. |
| Jun 19, 2012 | Signed | Brent Peterson | — | Cincinnati Reds | Cincinnati Reds signed SS Brent Peterson. |
| Jun 19, 2012 | Signed as free agent | Ty Washington | — | Cincinnati Reds | Cincinnati Reds signed free agent SS Ty Washington to a minor league contract. |
| Jun 19, 2012 | Signed | Mason Felt | — | Cincinnati Reds | Cincinnati Reds signed LHP Mason Felt. |
| Jun 19, 2012 | Signed as free agent | Robert Lewis-Walker | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Robert Lewis-Walker to a minor league contract. |
| Jun 19, 2012 | Signed | Tanner Rahier | — | Cincinnati Reds | Cincinnati Reds signed SS Tanner Rahier. |
| Jun 19, 2012 | Signed as free agent | Jonathan Perez | — | Cincinnati Reds | Cincinnati Reds signed free agent Jonathan Perez. |
| Jun 19, 2012 | Signed as free agent | Daniel Paula | — | Cincinnati Reds | Cincinnati Reds signed free agent C Daniel Paula to a minor league contract. |
| Jun 19, 2012 | Signed | Austin Salter | — | Cincinnati Reds | Cincinnati Reds signed RHP Austin Salter. |
| Jun 19, 2012 | Signed as free agent | Josh Kennelly | — | Cincinnati Reds | Cincinnati Reds signed free agent C Josh Kennelly to a minor league contract. |
| Jun 19, 2012 | Signed | Jon Moscot | — | Cincinnati Reds | Cincinnati Reds signed RHP Jon Moscot. |
| Jun 19, 2012 | Signed as free agent | Aldi Guzman | — | Cincinnati Reds | Cincinnati Reds signed free agent 1B Aldi Guzman to a minor league contract. |
| Jun 19, 2012 | Signed | Richard McCaffrey | — | Cincinnati Reds | Cincinnati Reds signed LHP Richard McCaffrey. |
| Jun 19, 2012 | Signed | Jackson Stephens | — | Cincinnati Reds | Cincinnati Reds signed RHP Jackson Stephens. |
| Jun 19, 2012 | Signed | Austin Muehring | — | Cincinnati Reds | Cincinnati Reds signed RHP Austin Muehring. |
| Jun 19, 2012 | Signed | Mike Saunders | — | Cincinnati Reds | Cincinnati Reds signed RHP Mike Saunders. |
| Jun 19, 2012 | Signed | Avain Rachal | — | Cincinnati Reds | Cincinnati Reds signed 2B Avain Rachal. |
| Jun 19, 2012 | Signed | Pierce Johnson | — | Chicago Cubs | Chicago Cubs signed RHP Pierce Johnson. |
| Jun 19, 2012 | Signed as free agent | Cristian Otero | — | San Francisco Giants | San Francisco Giants signed free agent SS Cristian Otero to a minor league contract. |
| Jun 19, 2012 | Signed as free agent | Travious Relaford | — | San Francisco Giants | San Francisco Giants signed free agent SS Travious Relaford to a minor league contract. |
| Jun 19, 2012 | Signed as free agent | Cameron McVey | — | San Francisco Giants | San Francisco Giants signed free agent RHP Cameron McVey to a minor league contract. |
| Jun 19, 2012 | Signed as free agent | Jake Smith | — | San Francisco Giants | San Francisco Giants signed free agent RHP Jake Smith to a minor league contract. |
| Jun 19, 2012 | Signed | Mitch Delfino | — | San Francisco Giants | San Francisco Giants signed 3B Mitchell Delfino. |
| Jun 19, 2012 | Signed as free agent | Shawn Hill | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Shawn Hill to a minor league contract. |
| Jun 19, 2012 | Signed as free agent | D.J. Carrasco | — | Atlanta Braves | Atlanta Braves signed free agent RHP D.J. Carrasco to a minor league contract. |
| Jun 19, 2012 | Signed | Dane Phillips | — | San Diego Padres | San Diego Padres signed C Dane Phillips. |
| Jun 19, 2012 | Signed | Chris Nunn | — | San Diego Padres | San Diego Padres signed LHP Chris Nunn. |
| Jun 19, 2012 | Signed | Roman Madrid | — | San Diego Padres | San Diego Padres signed RHP Roman Madrid. |
| Jun 19, 2012 | Signed as free agent | Hector Ambriz | — | Houston Astros | Houston Astros signed free agent RHP Hector Ambriz to a minor league contract. |
| Jun 19, 2012 | Signed as free agent | Dan Lazzaroni | — | San Diego Padres | San Diego Padres signed free agent RHP Dan Lazzaroni to a minor league contract. |
| Jun 19, 2012 | Signed | Mitch Gueller | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Mitch Gueller. |
| Jun 19, 2012 | Signed as free agent | Eric Meyerchick | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Eric Meyerchick to a minor league contract. |
| Jun 19, 2012 | Signed | Taylor Brennan | — | Milwaukee Brewers | Milwaukee Brewers signed 3B Taylor Smith-Brennan. |
| Jun 19, 2012 | Signed | Drew VerHagen | — | Detroit Tigers | Detroit Tigers signed RHP Drew VerHagen. |
| Jun 19, 2012 | Signed | Andrew Allen | — | Detroit Tigers | Detroit Tigers signed 1B Andrew Allen. |
| Jun 19, 2012 | Signed | Selme Angulo | — | Los Angeles Dodgers | Los Angeles Dodgers signed C Selme Angulo. |
| Jun 19, 2012 | Signed | Chris Breen | — | New York Yankees | New York Yankees signed C Chris Breen. |
| Jun 19, 2012 | Signed | Alfredo Unzue | — | Los Angeles Dodgers | Los Angeles Dodgers signed LHP Alfredo Unzue. |
| Jun 19, 2012 | Signed as free agent | Juan Torres | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Juan Torres to a minor league contract. |
| Jun 19, 2012 | Signed | Onelki Garcia | — | Los Angeles Dodgers | Los Angeles Dodgers signed LHP Onelki Garcia. |
| Jun 19, 2012 | Signed | Onelki Garcia | — | Los Angeles Dodgers | Los Angeles Dodgers signed Onelki Garcia. |
| Jun 19, 2012 | Signed | Jonathan Perez | — | Cincinnati Reds | Cincinnati Reds signed RHP Jonathan Perez. |
| Jun 19, 2012 | Signed as free agent | Kyle Shepard | — | Chicago Cubs | Chicago Cubs signed free agent LHP Kyle Shepard to a minor league contract. |
| Jun 18, 2012 | Signed as free agent | Kevin Mager | — | Boston Red Sox | Boston Red Sox signed free agent 1B Kevin Mager to a minor league contract. |
| Jun 18, 2012 | Signed | Courtney Hawkins | — | Chicago White Sox | Chicago White Sox signed OF Courtney Hawkins. |
| Jun 18, 2012 | Signed | Casey McCarthy | — | Miami Marlins | Miami Marlins signed RHP Casey McCarthy. |
| Jun 18, 2012 | Signed | Kyle Hansen | — | Chicago White Sox | Chicago White Sox signed RHP Kyle Hansen. |
| Jun 18, 2012 | Signed | Lance McCullers Jr. | — | Houston Astros | Houston Astros signed RHP Lance McCullers. |
| Jun 18, 2012 | Signed | Matthew Smoral | — | Toronto Blue Jays | Toronto Blue Jays signed LHP Matthew Smoral. |
| Jun 18, 2012 | Released | Livan Hernandez | — | Atlanta Braves | Atlanta Braves released RHP Livan Hernandez. |
| Jun 18, 2012 | Signed | Andrew Massie | — | New York Mets | New York Mets signed RHP Andrew Massie. |
| Jun 18, 2012 | Signed | Jon Leroux | — | New York Mets | New York Mets signed OF Jonathan Leroux. |
| Jun 18, 2012 | Signed as free agent | Nate Striz | — | Boston Red Sox | Boston Red Sox signed free agent RHP Nate Striz to a minor league contract. |
| Jun 18, 2012 | Signed as free agent | Anthony Santiago | — | Chicago White Sox | Chicago White Sox signed free agent RHP Anthony Santiago to a minor league contract. |
| Jun 18, 2012 | Signed | Josh Elander | — | Atlanta Braves | Atlanta Braves signed C Josh Elander. |
| Jun 18, 2012 | Signed as free agent | Jason Bergmann | — | Colorado Rockies | Colorado Rockies signed free agent RHP Jason Bergmann to a minor league contract. |
| Jun 18, 2012 | Signed | Will Clinard | — | Detroit Tigers | Detroit Tigers signed RHP Will Clinard. |
| Jun 18, 2012 | Signed | Jeremy Rathjen | — | Los Angeles Dodgers | Los Angeles Dodgers signed OF Jeremy Rathjen. |
| Jun 18, 2012 | Signed | Matt Reckling | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP Matthew Reckling. |
| Jun 18, 2012 | Signed as free agent | Ricky Orta | — | New York Yankees | New York Yankees signed free agent RHP Ricky Orta to a minor league contract. |
| Jun 18, 2012 | Signed as free agent | Jeff Baisley | — | Detroit Tigers | Detroit Tigers signed free agent 3B Jeff Baisley to a minor league contract. |
| Jun 18, 2012 | Signed | Rudy Flores | — | Arizona Diamondbacks | Arizona Diamondbacks signed 1B Rudy Flores. |
| Jun 18, 2012 | Signed | Zack Bird | — | Los Angeles Dodgers | Los Angeles Dodgers signed Zack Bird. |
| Jun 18, 2012 | Signed | Zach Eflin | — | San Diego Padres | San Diego Padres signed Zach Eflin. |
| Jun 18, 2012 | Signed | D.J. Driggers | — | Detroit Tigers | Detroit Tigers signed OF D.J. Driggers. |
| Jun 18, 2012 | Signed | Miguel Paulino | — | Detroit Tigers | Detroit Tigers signed CF Miguel Paulino. |
| Jun 18, 2012 | Signed | Jacob Kapstein | — | Detroit Tigers | Detroit Tigers signed C Jacob Kapstein. |
| Jun 18, 2012 | Signed | Michael Hamann | — | Chicago Cubs | Chicago Cubs signed RHP Michael Hamann. |
| Jun 18, 2012 | Signed as free agent | Matt Iannazzo | — | Chicago Cubs | Chicago Cubs signed free agent LHP Matt Iannazzo to a minor league contract. |
| Jun 18, 2012 | Signed | Kieran Lovegrove | — | Cleveland Guardians | Cleveland Indians signed RHP Kieran Lovegrove. |
| Jun 18, 2012 | Signed as free agent | Andrew Smith | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Andrew Smith to a minor league contract. |
| Jun 18, 2012 | Signed | Kody Eaves | — | Los Angeles Angels | Los Angeles Angels signed 2B Kody Eaves. |
| Jun 18, 2012 | Signed | Chad Martin | — | Chicago Cubs | Chicago Cubs signed RHP Chad Martin. |
| Jun 18, 2012 | Signed | Eddie Orozco | — | Chicago Cubs | Chicago Cubs signed RHP Eddie Orozco. |
| Jun 18, 2012 | Signed | Anthony Prieto | — | Chicago Cubs | Chicago Cubs signed LHP Anthony Prieto. |
| Jun 18, 2012 | Signed | Isaiah Yates | — | Seattle Mariners | Seattle Mariners signed OF Isaiah Yates. |
| Jun 18, 2012 | Signed as free agent | Burny Mitchem | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Burny Mitchem to a minor league contract. |
| Jun 17, 2012 | Signed | Nick Grim | — | Baltimore Orioles | Baltimore Orioles signed RHP Nicholas Grim. |
| Jun 17, 2012 | Signed | Dennis Torres | — | Baltimore Orioles | Baltimore Orioles signed RHP Dennis Torres. |
| Jun 17, 2012 | Signed | Jack Graham | — | Baltimore Orioles | Baltimore Orioles signed C Jack Graham. |
| Jun 17, 2012 | Signed | Dan Pellegrino | — | Baltimore Orioles | Baltimore Orioles signed C Dan Pellegrino. |
| Jun 17, 2012 | Signed | Steel Russell | — | Baltimore Orioles | Baltimore Orioles signed C Steel Russell. |
| Jun 17, 2012 | Signed | Lucas Goodgion | — | Tampa Bay Rays | Tampa Bay Rays signed LHP Lucas Goodgion. |
| Jun 17, 2012 | Signed | Mike Hauschild | — | Houston Astros | Houston Astros signed RHP Mike Hauschild. |
| Jun 17, 2012 | Signed | Michael Martinez | — | Houston Astros | Houston Astros signed 1B Michael Martinez. |
| Jun 17, 2012 | Signed | Michael Vaughn | — | Miami Marlins | Miami Marlins signed C Michael Vaughn. |
| Jun 17, 2012 | Signed | Tim Peterson | — | New York Mets | New York Mets signed RHP Tim Peterson. |
| Jun 17, 2012 | Signed | David Putman | — | Chicago White Sox | Chicago White Sox signed RHP David Putman. |
| Jun 17, 2012 | Signed as free agent | Cal Bowling | — | Chicago White Sox | Chicago White Sox signed free agent RHP Cal Bowling to a minor league contract. |
| Jun 17, 2012 | Signed | Brandon Garcia | — | Texas Rangers | Texas Rangers signed OF Brandon Garcia. |
| Jun 17, 2012 | Signed | Marsalis Holloway | — | Kansas City Royals | Kansas City Royals signed OF Marsalis Holloway. |
| Jun 17, 2012 | Signed | JT Chargois | — | Minnesota Twins | Minnesota Twins signed RHP J.T. Chargois. |
| Jun 17, 2012 | Signed | Tyler Duffey | — | Minnesota Twins | Minnesota Twins signed RHP Tyler Duffey. |
| Jun 17, 2012 | Signed | Adam Brett Walker | — | Minnesota Twins | Minnesota Twins signed OF Adam Brett Walker II. |
| Jun 17, 2012 | Signed | D.J. Hicks | — | Minnesota Twins | Minnesota Twins signed 1B Dalton Hicks. |
| Jun 17, 2012 | Signed | Bo Altobelli | — | Minnesota Twins | Minnesota Twins signed C Bo Altobelli. |
| Jun 17, 2012 | Signed | Zack Jones | — | Minnesota Twins | Minnesota Twins signed RHP Zach Jones. |
| Jun 17, 2012 | Signed | Mason Melotakis | — | Minnesota Twins | Minnesota Twins signed LHP Mason Melotakis. |
| Jun 17, 2012 | Signed | Taylor Rogers | — | Minnesota Twins | Minnesota Twins signed LHP Taylor Rogers. |
| Jun 17, 2012 | Signed | Jose Barraza | — | Chicago White Sox | Chicago White Sox signed 3B Jose Barraza. |
| Jun 17, 2012 | Signed | Thurman Hall | — | Chicago White Sox | Chicago White Sox signed OF Thurman Hall. |
| Jun 17, 2012 | Signed | Dustin Hayes | — | Chicago White Sox | Chicago White Sox signed OF Dustin Hayes. |
| Jun 17, 2012 | Signed | Zach Stoner | — | Chicago White Sox | Chicago White Sox signed 1B Zach Stoner. |
| Jun 17, 2012 | Signed | Branden Kaupe | — | New York Mets | New York Mets signed SS Branden Kaupe. |
| Jun 17, 2012 | Signed | Tomás Nido | — | New York Mets | New York Mets signed C Tomas Nido. |
| Jun 17, 2012 | Signed | Corey Oswalt | — | New York Mets | New York Mets signed RHP Corey Oswalt. |
| Jun 17, 2012 | Signed as free agent | Justin Thompson | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Justin Thompson to a minor league contract. |
| Jun 17, 2012 | Signed | Cory Jones | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Cory Jones. |
| Jun 17, 2012 | Signed as free agent | Jeff Rauh | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Jeff Rauh to a minor league contract. |
| Jun 17, 2012 | Signed as free agent | Hector Guerrero | — | Colorado Rockies | Colorado Rockies signed free agent RHP Hector Guerrero to a minor league contract. |
| Jun 17, 2012 | Signed as free agent | Zach Petrick | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Zach Petrick to a minor league contract. |
| Jun 17, 2012 | Signed as free agent | Keith Werman | — | Seattle Mariners | Seattle Mariners signed free agent 2B Keith Werman to a minor league contract. |
| Jun 17, 2012 | Signed | Pat Cantwell | — | Texas Rangers | Texas Rangers signed C Pat Cantwell. |
| Jun 16, 2012 | Signed | Max Muncy | — | Athletics | Oakland Athletics signed 1B Max Muncy. |
| Jun 16, 2012 | Signed | Dakota Bacus | — | Athletics | Oakland Athletics signed RHP Dakota Bacus. |
| Jun 16, 2012 | Signed | Ryan Mathews | — | Athletics | Oakland Athletics signed OF Ryan Mathews. |
| Jun 16, 2012 | Signed | Paul Blackburn | — | Chicago Cubs | Chicago Cubs signed RHP Paul Blackburn. |
| Jun 16, 2012 | Signed | Josh Conway | — | Chicago Cubs | Chicago Cubs signed RHP Joshua Conway. |
| Jun 16, 2012 | Signed | Stephen Bruno | — | Chicago Cubs | Chicago Cubs signed SS Stephen Bruno. |
| Jun 16, 2012 | Signed | Michael Heesch | — | Chicago Cubs | Chicago Cubs signed LHP Michael Heesch. |
| Jun 16, 2012 | Signed | Chadd Krist | — | Chicago Cubs | Chicago Cubs signed C Chadd Krist. |
| Jun 16, 2012 | Signed | Rashad Crawford | — | Chicago Cubs | Chicago Cubs signed OF Rashad Crawford. |
| Jun 16, 2012 | Signed | Corbin Hoffner | — | Chicago Cubs | Chicago Cubs signed RHP Corbin Hoffner. |
| Jun 16, 2012 | Signed | Carlos Escobar | — | Chicago Cubs | Chicago Cubs signed C Carlos Escobar. |
| Jun 16, 2012 | Signed | Nathan Dorris | — | Chicago Cubs | Chicago Cubs signed LHP Nathan Dorris. |
| Jun 16, 2012 | Signed | Stephen Perakslis | — | Chicago Cubs | Chicago Cubs signed RHP Stephen Perakslis. |
| Jun 16, 2012 | Signed | Lance Rymel | — | Chicago Cubs | Chicago Cubs signed C Lance Rymel. |
| Jun 16, 2012 | Signed | Izaac Garsez | — | Chicago Cubs | Chicago Cubs signed OF Izaac Garsez. |
| Jun 16, 2012 | Signed | Tim Saunders | — | Chicago Cubs | Chicago Cubs signed SS Tim Saunders. |
| Jun 16, 2012 | Signed | Ben Carhart | — | Chicago Cubs | Chicago Cubs signed 3B Ben Carhart. |
| Jun 16, 2012 | Signed | Jacob Rogers | — | Chicago Cubs | Chicago Cubs signed 3B Jacob Rogers. |
| Jun 16, 2012 | Signed | Wilfredo Rodriguez | — | Colorado Rockies | Colorado Rockies signed C Wilfredo Rodriguez. |
| Jun 16, 2012 | Signed | Martin Viramontes | — | Milwaukee Brewers | Milwaukee Brewers signed RHP Martin Viramontes. |
| Jun 16, 2012 | Signed | Jake Proctor | — | Minnesota Twins | Minnesota Twins signed OF Jake Proctor. |
| Jun 16, 2012 | Signed | J.J. Fernandez | — | Minnesota Twins | Minnesota Twins signed C Jorge Fernandez. |
| Jun 16, 2012 | Signed | Rashad Brown | — | Detroit Tigers | Detroit Tigers signed OF Rashad Brown. |
| Jun 16, 2012 | Signed | Damion Carroll | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Damion Carroll. |
| Jun 16, 2012 | Signed as free agent | Tzu-Wei Lin | — | Boston Red Sox | Boston Red Sox signed free agent SS Tzu-Wei Lin to a minor league contract. |
| Jun 16, 2012 | Signed | Stephen Piscotty | — | St. Louis Cardinals | St. Louis Cardinals signed 3B Stephen Piscotty. |
| Jun 16, 2012 | Signed | Corey Black | — | New York Yankees | New York Yankees signed RHP Corey Black. |
| Jun 15, 2012 | Signed | Preston Jamison | — | Detroit Tigers | Detroit Tigers signed LHP Preston Jamison. |
| Jun 15, 2012 | Signed | Charlie Neil | — | Detroit Tigers | Detroit Tigers signed C Charlie Neil. |
| Jun 15, 2012 | Signed | David Dahl | — | Colorado Rockies | Colorado Rockies signed OF David Dahl. |
| Jun 15, 2012 | Signed | Eddie Butler | — | Colorado Rockies | Colorado Rockies signed RHP Eddie Butler. |
| Jun 15, 2012 | Signed | Ryan Warner | — | Colorado Rockies | Colorado Rockies signed RHP Ryan Warner. |
| Jun 15, 2012 | Signed | Zach Jemiola | — | Colorado Rockies | Colorado Rockies signed RHP Zach Jemiola. |
| Jun 15, 2012 | Signed | Ben Waldrip | — | Colorado Rockies | Colorado Rockies signed 1B Ben Waldrip. |
| Jun 15, 2012 | Signed | Correlle Prime | — | Colorado Rockies | Colorado Rockies signed 1B Correlle Prime. |
| Jun 15, 2012 | Signed | Scott Oberg | — | Colorado Rockies | Colorado Rockies signed RHP Scott Oberg. |
| Jun 15, 2012 | Signed | Jeff Popick | — | Colorado Rockies | Colorado Rockies signed OF Jeff Popick. |
| Jun 15, 2012 | Signed | Jason Stolz | — | Colorado Rockies | Colorado Rockies signed 2B Jason Stolz. |
| Jun 15, 2012 | Signed | Kyle Newton | — | Colorado Rockies | Colorado Rockies signed OF Kyle Newton. |
| Jun 15, 2012 | Signed | Anthony Seise | — | Colorado Rockies | Colorado Rockies signed LHP Anthony Seise. |
| Jun 15, 2012 | Signed | Rayan González | — | Colorado Rockies | Colorado Rockies signed RHP Rayan Gonzalez. |
| Jun 15, 2012 | Signed | Jordan Mejia | — | Colorado Rockies | Colorado Rockies signed RHP Jordan Mejia. |
| Jun 15, 2012 | Signed | Michael Mason | — | Colorado Rockies | Colorado Rockies signed LHP Michael Mason. |
| Jun 15, 2012 | Signed | Shawn Stuart | — | Colorado Rockies | Colorado Rockies signed RHP Shawn Stuart. |
| Jun 15, 2012 | Signed | Ryan Garvey | — | Colorado Rockies | Colorado Rockies signed IF Ryan Garvey. |
| Jun 15, 2012 | Signed | Chris Cowell | — | Colorado Rockies | Colorado Rockies signed C Chris Cowell. |
| Jun 15, 2012 | Signed | Pat Light | — | Boston Red Sox | Boston Red Sox signed RHP Pat Light. |
| Jun 15, 2012 | Signed | Jamie Callahan | — | Boston Red Sox | Boston Red Sox signed RHP Jamie Callahan. |
| Jun 15, 2012 | Signed | Ty Buttrey | — | Boston Red Sox | Boston Red Sox signed RHP Ty Buttrey. |
| Jun 15, 2012 | Signed | Miguel Rodriguez | — | Boston Red Sox | Boston Red Sox signed C Miguel Rodriguez. |
| Jun 15, 2012 | Signed | Shaq Thompson | — | Boston Red Sox | Boston Red Sox signed OF Shaq Thompson. |
| Jun 15, 2012 | Signed | Jake Davies | — | Boston Red Sox | Boston Red Sox signed 1B Jake Davies. |
| Jun 15, 2012 | Signed | Tyler Naquin | — | Cleveland Guardians | Cleveland Indians signed OF Tyler Naquin. |
| Jun 15, 2012 | Signed | Mitch Brown | — | Cleveland Guardians | Cleveland Indians signed RHP Mitch Brown. |
| Jun 15, 2012 | Signed | Max Fried | — | San Diego Padres | San Diego Padres signed Max Fried. |
| Jun 15, 2012 | Signed | Mitch Haniger | — | Milwaukee Brewers | Milwaukee Brewers signed RF Mitch Haniger. |
| Jun 15, 2012 | Signed | Tyrone Taylor | — | Milwaukee Brewers | Milwaukee Brewers signed OF Tyrone Taylor. |
| Jun 15, 2012 | Signed | Zach Quintana | — | Milwaukee Brewers | Milwaukee Brewers signed Zach Quintana. |
| Jun 15, 2012 | Signed | Tyler Wagner | — | Milwaukee Brewers | Milwaukee Brewers signed RHP Tyler Wagner. |
| Jun 15, 2012 | Signed | Angel Ortega | — | Milwaukee Brewers | Milwaukee Brewers signed SS Angel Ortega. |
| Jun 15, 2012 | Signed | David Otterman | — | Milwaukee Brewers | Milwaukee Brewers signed LHP David Otterman. |
| Jun 15, 2012 | Signed | Alejandro Lavandero | — | Milwaukee Brewers | Milwaukee Brewers signed RHP Alejandro Lavandero. |
| Jun 15, 2012 | Signed | Anthony Banda | — | Milwaukee Brewers | Milwaukee Brewers signed Anthony Banda. |
| Jun 15, 2012 | Signed | Eric Semmelhack | — | Milwaukee Brewers | Milwaukee Brewers signed RHP Eric Semmelhack. |
| Jun 15, 2012 | Signed | Alan Sharkey | — | Milwaukee Brewers | Milwaukee Brewers signed 1B Alan Sharkey. |
| Jun 15, 2012 | Signed | Adam Giacalone | — | Milwaukee Brewers | Milwaukee Brewers signed 1B Adam Giacalone. |
| Jun 15, 2012 | Signed | Alfredo Rodriguez | — | Milwaukee Brewers | Milwaukee Brewers signed SS Alfredo Rodriguez. |
| Jun 15, 2012 | Signed | Michael Garza | — | Milwaukee Brewers | Milwaukee Brewers signed 3B Michael Garza. |
| Jun 15, 2012 | Signed | Austin Blaski | — | Milwaukee Brewers | Milwaukee Brewers signed RHP Austin Blaski. |
| Jun 15, 2012 | Signed | Michael Turay | — | Milwaukee Brewers | Milwaukee Brewers signed C Michael Turay. |
| Jun 15, 2012 | Signed | Lance Roenicke | — | Milwaukee Brewers | Milwaukee Brewers signed OF Lance Roenicke. |
| Jun 15, 2012 | Signed | Jono Armold | — | Milwaukee Brewers | Milwaukee Brewers signed RHP Jonathan Armold. |
| Jun 15, 2012 | Signed | Brent Suter | — | Milwaukee Brewers | Milwaukee Brewers signed LHP Brent Suter. |
| Jun 15, 2012 | Signed | Austin Hall | — | Milwaukee Brewers | Milwaukee Brewers signed RHP Austin Hall. |
| Jun 15, 2012 | Signed | Jose Sermo | — | Milwaukee Brewers | Milwaukee Brewers signed SS Jose Sermo. |
| Jun 15, 2012 | Signed as free agent | Taylor Mangum | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Taylor Mangum to a minor league contract. |
| Jun 15, 2012 | Signed | Addison Russell | — | Athletics | Oakland Athletics signed SS Addison Russell. |
| Jun 15, 2012 | Signed | Seth Streich | — | Athletics | Oakland Athletics signed Seth Streich. |
| Jun 15, 2012 | Signed | Barrett Barnes | — | Pittsburgh Pirates | Pittsburgh Pirates signed OF Barrett Barnes. |
| Jun 15, 2012 | Signed as free agent | Matt Foat | — | Washington Nationals | Washington Nationals signed free agent 1B Matt Foat to a minor league contract. |
| Jun 15, 2012 | Signed | Nolan Becker | — | Cincinnati Reds | Cincinnati Reds signed LHP Nolan Becker. |
| Jun 15, 2012 | Signed | Ben Klimesh | — | Cincinnati Reds | Cincinnati Reds signed RHP Ben Klimesh. |
| Jun 15, 2012 | Signed | Ryan Gibbard | — | Milwaukee Brewers | Milwaukee Brewers signed RHP Ryan Gibbard. |
| Jun 15, 2012 | Signed | Taylor Wall | — | Milwaukee Brewers | Milwaukee Brewers signed LHP Taylor Wall. |
| Jun 15, 2012 | Signed | Paul Eshleman | — | Milwaukee Brewers | Milwaukee Brewers signed C Paul Eshleman. |
| Jun 15, 2012 | Signed | Geoffrey Davenport | — | Cleveland Guardians | Cleveland Indians signed LHP Geoffrey Davenport. |
| Jun 15, 2012 | Signed | Richie Rodriguez | — | New York Mets | New York Mets signed RHP Richie Rodriguez. |
| Jun 15, 2012 | Signed | Jeff Reynolds | — | New York Mets | New York Mets signed 3B Jeff Reynolds. |
| Jun 15, 2012 | Signed | Matt Bowman | — | New York Mets | New York Mets signed RHP Matt Bowman. |
| Jun 15, 2012 | Signed | Matt Koch | — | New York Mets | New York Mets signed RHP Matthew Koch. |
| Jun 15, 2012 | Signed | Paul Sewald | — | New York Mets | New York Mets signed RHP Paul Sewald. |
| Jun 15, 2012 | Signed | Tyler Vanderheiden | — | New York Mets | New York Mets signed RHP Tyler Vanderheiden. |
| Jun 15, 2012 | Signed | Brandon Welch | — | New York Mets | New York Mets signed RHP Brandon Welch. |
| Jun 15, 2012 | Signed | Rob Whalen | — | New York Mets | New York Mets signed RHP Robert Whalen. |
| Jun 15, 2012 | Signed | Stefan Sabol | — | New York Mets | New York Mets signed OF Stephan Sabol. |
| Jun 15, 2012 | Signed | James Stokes | — | Cleveland Guardians | Cleveland Indians signed RHP James Stokes. |
| Jun 15, 2012 | Signed | Trent Blank | — | Colorado Rockies | Colorado Rockies signed RHP Trent Blank. |
| Jun 15, 2012 | Signed as free agent | Marquez Smith | — | Boston Red Sox | Boston Red Sox signed free agent 3B Marquez Smith to a minor league contract. |
| Jun 15, 2012 | Signed | Jeff McVaney | — | Detroit Tigers | Detroit Tigers signed OF Jeff McVaney. |
| Jun 15, 2012 | Signed | Daniel Duran | — | Tampa Bay Rays | Tampa Bay Rays signed 3B Daniel Duran. |
| Jun 15, 2012 | Signed as free agent | Óscar Hernández | — | Tampa Bay Rays | Tampa Bay Rays signed free agent Oscar Hernandez. |
| Jun 15, 2012 | Signed | Jeremy Fitzgerald | — | Atlanta Braves | Atlanta Braves signed RHP Jeremy Fitzgerald. |
| Jun 15, 2012 | Signed | Nate Hyatt | — | Atlanta Braves | Atlanta Braves signed Nate Hyatt. |
| Jun 15, 2012 | Signed | Alex Wilson | — | Atlanta Braves | Atlanta Braves signed RHP Alex Wilson. |
| Jun 15, 2012 | Signed | Tyler Tewell | — | Atlanta Braves | Atlanta Braves signed C Tyler Tewell. |
| Jun 15, 2012 | Signed | Eric Garcia | — | Atlanta Braves | Atlanta Braves signed IF Eric Garcia. |
| Jun 15, 2012 | Signed | Levi Hyams | — | Atlanta Braves | Atlanta Braves signed 2B Levi Hyams. |
| Jun 15, 2012 | Signed | Casey Kalenkosky | — | Atlanta Braves | Atlanta Braves signed 1B Casey Kalenkosky. |
| Jun 15, 2012 | Signed | Trenton Moses | — | Atlanta Braves | Atlanta Braves signed 3B Trenton Moses. |
| Jun 15, 2012 | Signed | Blake Brown | — | Atlanta Braves | Atlanta Braves signed OF Blake Brown. |
| Jun 15, 2012 | Signed | Matt Carasiti | — | Colorado Rockies | Colorado Rockies signed RHP Matt Carasiti. |
| Jun 15, 2012 | Signed | Matt Wessinger | — | Colorado Rockies | Colorado Rockies signed 2B Matt Wessinger. |
| Jun 15, 2012 | Signed | Max White | — | Colorado Rockies | Colorado Rockies signed OF Max White. |
| Jun 15, 2012 | Signed | Robert Ravago | — | Miami Marlins | Miami Marlins signed RHP Robert Ravago. |
| Jun 15, 2012 | Signed | Duke Von Schamann | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP Duke von Schamann. |
| Jun 15, 2012 | Signed | Danny Coulombe | — | Los Angeles Dodgers | Los Angeles Dodgers signed LHP Daniel Coulombe. |
| Jun 15, 2012 | Signed | Eric Smith | — | Los Angeles Dodgers | Los Angeles Dodgers signed C Eric Smith. |
| Jun 15, 2012 | Signed | Pat Stover | — | Los Angeles Dodgers | Los Angeles Dodgers signed OF Pat Stover. |
| Jun 15, 2012 | Signed | Zach Cooper | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Zach Cooper. |
| Jun 15, 2012 | Signed | José Berríos | — | Minnesota Twins | Minnesota Twins signed RHP Jose Berrios. |
| Jun 15, 2012 | Signed | Alex Muren | — | Minnesota Twins | Minnesota Twins signed RHP Alex Muren. |
| Jun 15, 2012 | Signed | Bryan Haar | — | Minnesota Twins | Minnesota Twins signed 1B Bryan Haar. |
| Jun 15, 2012 | Signed | William Hurt | — | Minnesota Twins | Minnesota Twins signed SS Will Hurt. |
| Jun 15, 2012 | Signed | Jon Murphy | — | Minnesota Twins | Minnesota Twins signed OF Jonathan Murphy. |
| Jun 15, 2012 | Signed | Sam Kimmel | — | Baltimore Orioles | Baltimore Orioles signed C Sam Kimmel. |
| Jun 15, 2012 | Signed | Will Howard | — | Baltimore Orioles | Baltimore Orioles signed OF Will Howard. |
| Jun 15, 2012 | Signed | Gene Escat | — | Baltimore Orioles | Baltimore Orioles signed RHP Gene Escat. |
| Jun 15, 2012 | Signed | Creede Simpson | — | Baltimore Orioles | Baltimore Orioles signed 2B Creede Simpson. |
| Jun 15, 2012 | Signed | Anthony Vega | — | Baltimore Orioles | Baltimore Orioles signed OF Anthony Vega. |
| Jun 15, 2012 | Signed as free agent | Sander Beck | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Sander Beck to a minor league contract. |
| Jun 15, 2012 | Signed | Wuilmer Becerra | — | Toronto Blue Jays | Toronto Blue Jays signed OF Wuilmer Becerra. |
| Jun 15, 2012 | Signed | Tyler Hanover | — | Detroit Tigers | Detroit Tigers signed SS Tyler Hanover. |
| Jun 15, 2012 | Signed | Chris Nichols | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Chris Nichols. |
| Jun 15, 2012 | Signed | Alex Moshier | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Alex Moshier. |
| Jun 15, 2012 | Signed | Charles Basford | — | New York Yankees | New York Yankees signed RHP Charles Basford. |
| Jun 15, 2012 | Signed | Andrew Benak | — | New York Yankees | New York Yankees signed RHP Andrew Benak. |
| Jun 15, 2012 | Signed | Dietrich Enns | — | New York Yankees | New York Yankees signed LHP Dietrich Enns. |
| Jun 15, 2012 | Signed | Eric Erickson | — | New York Yankees | New York Yankees signed LHP Eric Erickson. |
| Jun 15, 2012 | Signed | Tim Flight | — | New York Yankees | New York Yankees signed LHP Tim Flight. |
| Jun 15, 2012 | Signed | Danny Oh | — | New York Yankees | New York Yankees signed OF Danny Oh. |
| Jun 15, 2012 | Signed | Collin Reynolds | — | San Diego Padres | San Diego Padres signed RHP Collin Reynolds. |
| Jun 15, 2012 | Signed | Carson Kelly | — | St. Louis Cardinals | St. Louis Cardinals signed IF Carson Kelly. |
| Jun 15, 2012 | Signed as free agent | Thomas Lee | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Thomas Lee to a minor league contract. |
| Jun 15, 2012 | Signed | Jordan John | — | Detroit Tigers | Detroit Tigers signed LHP Jordan John. |
| Jun 15, 2012 | Signed | Logan Seifrit | — | Seattle Mariners | Seattle Mariners signed RHP Logan Seifrit. |
| Jun 15, 2012 | Signed | Justin Chigbogu | — | Los Angeles Dodgers | Los Angeles Dodgers signed 1B Justin Chigbogu. |
| Jun 15, 2012 | Signed | Austin Aune | — | New York Yankees | New York Yankees signed SS Austin Aune. |
| Jun 15, 2012 | Signed | Alan Garcia | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP Alan Garcia. |
| Jun 15, 2012 | Signed as free agent | Rauldison Rodriguez | — | Houston Astros | Houston Astros signed free agent RHP Rauldison Rodriguez to a minor league contract. |
| Jun 15, 2012 | Signed | Chad Nacapoy | — | Tampa Bay Rays | Tampa Bay Rays signed C Chad Nacapoy. |
| Jun 15, 2012 | Signed as free agent | David Ramos | — | Washington Nationals | Washington Nationals signed free agent RHP David Ramos to a minor league contract. |
| Jun 14, 2012 | Signed | Andrew Pullin | — | Philadelphia Phillies | Philadelphia Phillies signed OF Andrew Pullin. |
| Jun 14, 2012 | Signed | Jonathan Sandfort | — | Pittsburgh Pirates | Pittsburgh Pirates signed RHP Jonathan Sandfort. |
| Jun 14, 2012 | Signed | Edwin Díaz | — | Seattle Mariners | Seattle Mariners signed RHP Edwin Diaz. |
| Jun 14, 2012 | Signed | Tyler Pike | — | Seattle Mariners | Seattle Mariners signed LHP Tyler Pike. |
| Jun 14, 2012 | Signed | Zach Taylor | — | Philadelphia Phillies | Philadelphia Phillies signed OF Zach Taylor. |
| Jun 14, 2012 | Signed as free agent | Jason Pridie | — | Philadelphia Phillies | Philadelphia Phillies signed free agent CF Jason Pridie to a minor league contract. |
| Jun 14, 2012 | Signed | Ronnie Richardson | — | San Diego Padres | San Diego Padres signed CF Ronnie Richardson. |
| Jun 14, 2012 | Signed | Ryan Dunn | — | Tampa Bay Rays | Tampa Bay Rays signed IF Ryan Dunn. |
| Jun 14, 2012 | Signed as free agent | Charles Epperson | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Charles Epperson to a minor league contract. |
| Jun 14, 2012 | Signed | Mike Morin | — | Los Angeles Angels | Los Angeles Angels signed RHP Mike Morin. |
| Jun 14, 2012 | Signed | Caleb Bushyhead | — | Los Angeles Angels | Los Angeles Angels signed SS Caleb Bushyhead. |
| Jun 14, 2012 | Signed as free agent | Jose Queliz | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent C Jose Queliz to a minor league contract. |
| Jun 14, 2012 | Signed | Josh Renfro | — | St. Louis Cardinals | St. Louis Cardinals signed LHP Josh Renfro. |
| Jun 14, 2012 | Signed | Chris Thomas | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Christopher Thomas. |
| Jun 14, 2012 | Signed as free agent | Nik Balog | — | Baltimore Orioles | Baltimore Orioles signed free agent 1B Nik Balog to a minor league contract. |
| Jun 14, 2012 | Signed | Nick Goody | — | New York Yankees | New York Yankees signed RHP Nick Goody. |
| Jun 14, 2012 | Signed | Stefan Lopez | — | New York Yankees | New York Yankees signed RHP Stefan Lopez. |
| Jun 14, 2012 | Signed | James Pazos | — | New York Yankees | New York Yankees signed LHP James Pazos. |
| Jun 14, 2012 | Signed | Derek Varnadore | — | New York Yankees | New York Yankees signed RHP Derek Varnadore. |
| Jun 14, 2012 | Signed as free agent | Tanner Hamilton | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Tanner Hamilton to a minor league contract. |
| Jun 14, 2012 | Signed | Michael Wacha | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Michael Wacha. |
| Jun 14, 2012 | Signed as free agent | Jacob Booden | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Jacob Booden to a minor league contract. |
| Jun 14, 2012 | Signed as free agent | Jared Schlehuber | — | Kansas City Royals | Kansas City Royals signed free agent 1B Jared Schlehuber to a minor league contract. |
| Jun 14, 2012 | Signed | Tyler Booth | — | Cleveland Guardians | Cleveland Indians signed OF Tyler Booth. |
| Jun 14, 2012 | Signed | Alex Keudell | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Alex Keudell. |
| Jun 14, 2012 | Signed as free agent | Joshua Torres | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Joshua Torres to a minor league contract. |
| Jun 14, 2012 | Signed | Yordany Reinoso | — | Los Angeles Angels | Los Angeles Angels signed RHP Yordany Reinoso. |
| Jun 14, 2012 | Signed as free agent | Ivan Andueza | — | Athletics | Oakland Athletics signed free agent LHP Ivan Andueza to a minor league contract. |
| Jun 13, 2012 | Signed | Byron Buxton | — | Minnesota Twins | Minnesota Twins signed CF Byron Buxton. |
| Jun 13, 2012 | Signed | Jake Thompson | — | Detroit Tigers | Detroit Tigers signed RHP Jake Thompson. |
| Jun 13, 2012 | Signed | Austin Schotts | — | Detroit Tigers | Detroit Tigers signed CF Austin Schotts. |
| Jun 13, 2012 | Signed | Joe Rogers | — | Detroit Tigers | Detroit Tigers signed LHP Joe Rogers. |
| Jun 13, 2012 | Signed | Charlie Gillies | — | Detroit Tigers | Detroit Tigers signed RHP Charlie Gillies. |
| Jun 13, 2012 | Signed | Bennett Pickar | — | Detroit Tigers | Detroit Tigers signed C Bennett Pickar. |
| Jun 13, 2012 | Signed | Alex Yarbrough | — | Los Angeles Angels | Los Angeles Angels signed 2B Alex Yarbrough. |
| Jun 13, 2012 | Signed | Julio Felix | — | Detroit Tigers | Detroit Tigers signed RHP Julio Felix. |
| Jun 13, 2012 | Signed | Jordan Dean | — | Detroit Tigers | Detroit Tigers signed SS Jordan Dean. |
| Jun 13, 2012 | Signed | Slade Smith | — | Detroit Tigers | Detroit Tigers signed RHP Slade Smith. |
| Jun 13, 2012 | Signed | Alex Phillips | — | Detroit Tigers | Detroit Tigers signed LHP Alex Phillips. |
| Jun 13, 2012 | Signed | Nick Carmichael | — | Detroit Tigers | Detroit Tigers signed RHP Nick Carmichael. |
| Jun 13, 2012 | Signed | Jared Reaves | — | Detroit Tigers | Detroit Tigers signed SS Jared Reaves. |
| Jun 13, 2012 | Signed | Josh Carr | — | Detroit Tigers | Detroit Tigers signed RHP Joshua Carr. |
| Jun 13, 2012 | Signed | Zach Kirksey | — | Detroit Tigers | Detroit Tigers signed OF Zach Kirksey. |
| Jun 13, 2012 | Signed | Matt Davenport | — | Detroit Tigers | Detroit Tigers signed RHP Matt Davenport. |
| Jun 13, 2012 | Signed | Ryan Longstreth | — | Detroit Tigers | Detroit Tigers signed LHP Ryan Longstreth. |
| Jun 13, 2012 | Signed | Austin Adams | — | Los Angeles Angels | Los Angeles Angels signed RHP Austin Adams. |
| Jun 13, 2012 | Signed | Jonathan Walsh | — | Los Angeles Angels | Los Angeles Angels signed LF Jonathan Walsh. |
| Jun 13, 2012 | Signed | Reid Scoggins | — | Los Angeles Angels | Los Angeles Angels signed RHP Reid Scoggins. |
| Jun 13, 2012 | Signed | Ryan Dalton | — | Los Angeles Angels | Los Angeles Angels signed 3B Ryan Dalton. |
| Jun 13, 2012 | Signed | Aaron Newcomb | — | Los Angeles Angels | Los Angeles Angels signed RHP Aaron Newcomb. |
| Jun 13, 2012 | Signed | Michael Snyder | — | Los Angeles Angels | Los Angeles Angels signed 3B Michael Snyder. |
| Jun 13, 2012 | Signed | Garrett Bush | — | Los Angeles Angels | Los Angeles Angels signed RHP Garrett Bush. |
| Jun 13, 2012 | Signed | Kyle Johnson | — | Los Angeles Angels | Los Angeles Angels signed OF Kyle Johnson. |
| Jun 13, 2012 | Signed | Wade Hinkle | — | Los Angeles Angels | Los Angeles Angels signed 1B Wade Hinkle. |
| Jun 13, 2012 | Signed | Robert Powell | — | Los Angeles Angels | Los Angeles Angels signed RHP Robert Powell. |
| Jun 13, 2012 | Signed | Samuel Mulroy | — | Los Angeles Angels | Los Angeles Angels signed C Samuel Mulroy. |
| Jun 13, 2012 | Signed | Matt Collins | — | Los Angeles Angels | Los Angeles Angels signed RHP Matt Collins. |
| Jun 13, 2012 | Signed | Jake Boyd | — | Los Angeles Angels | Los Angeles Angels signed RHP Jake Boyd. |
| Jun 13, 2012 | Signed | Grady Wood | — | Seattle Mariners | Seattle Mariners signed RHP Grady Wood. |
| Jun 13, 2012 | Signed | Blake Hauser | — | Seattle Mariners | Seattle Mariners signed RHP Blake Hauser. |
| Jun 13, 2012 | Signed | Patrick Kivlehan | — | Seattle Mariners | Seattle Mariners signed 3B Patrick Kivlehan. |
| Jun 13, 2012 | Signed | Taylor Ard | — | Seattle Mariners | Seattle Mariners signed 1B Taylor Ard. |
| Jun 13, 2012 | Signed | Jamodrick McGruder | — | Seattle Mariners | Seattle Mariners signed 2B Jamodrick McGruder. |
| Jun 13, 2012 | Signed | Michael Faulkner | — | Seattle Mariners | Seattle Mariners signed OF Michael Faulkner. |
| Jun 13, 2012 | Signed | Dominic Leone | — | Seattle Mariners | Seattle Mariners signed RHP Dominic Leone. |
| Jun 13, 2012 | Signed | Steven Ewing | — | Seattle Mariners | Seattle Mariners signed LHP Steven Ewing. |
| Jun 13, 2012 | Signed | Scott DeCecco | — | Seattle Mariners | Seattle Mariners signed LHP Scott DeCecco. |
| Jun 13, 2012 | Signed | Matt Vedo | — | Seattle Mariners | Seattle Mariners signed RHP Matt Vedo. |
| Jun 13, 2012 | Signed | Mark Bordonaro | — | Seattle Mariners | Seattle Mariners signed RHP Mark Bordonaro. |
| Jun 13, 2012 | Signed | Brock Hebert | — | Seattle Mariners | Seattle Mariners signed 2B Brock Hebert. |
| Jun 13, 2012 | Signed | Dario Pizzano | — | Seattle Mariners | Seattle Mariners signed OF Dario Pizzano. |
| Jun 13, 2012 | Signed | Jabari Henry | — | Seattle Mariners | Seattle Mariners signed OF Jabari Henry. |
| Jun 13, 2012 | Signed | Nate Koneski | — | Seattle Mariners | Seattle Mariners signed LHP Nate Koneski. |
| Jun 13, 2012 | Signed | Levi Dean | — | Seattle Mariners | Seattle Mariners signed RHP Levi Dean. |
| Jun 13, 2012 | Signed | Blake Holovach | — | Seattle Mariners | Seattle Mariners signed LHP Blake Holovach. |
| Jun 13, 2012 | Signed | Matt Brazis | — | Seattle Mariners | Seattle Mariners signed RHP Matt Brazis. |
| Jun 13, 2012 | Signed | Toby DeMello | — | Seattle Mariners | Seattle Mariners signed C Toby DeMello. |
| Jun 13, 2012 | Signed | Joe DeCarlo | — | Seattle Mariners | Seattle Mariners signed SS Joseph DeCarlo. |
| Jun 13, 2012 | Signed | Tim Lopes | — | Seattle Mariners | Seattle Mariners signed SS Tim Lopes. |
| Jun 13, 2012 | Signed | Kristian Brito | — | Seattle Mariners | Seattle Mariners signed 1B Kristian Brito. |
| Jun 13, 2012 | Signed | Gabrial Franca | — | Seattle Mariners | Seattle Mariners signed SS Gabrial Franca. |
| Jun 13, 2012 | Signed | Aaron Brooks | — | Seattle Mariners | Seattle Mariners signed RHP Aaron Brooks. |
| Jun 13, 2012 | Signed | Rusty Shellhorn | — | Seattle Mariners | Seattle Mariners signed LHP Rusty Shellhorn. |
| Jun 13, 2012 | Signed | Richard Palase | — | Seattle Mariners | Seattle Mariners signed 2B Richard Palase. |
| Jun 13, 2012 | Signed | Chris Taylor | — | Seattle Mariners | Seattle Mariners signed SS Chris Taylor. |
| Jun 13, 2012 | Signed | Boog Powell | — | Athletics | Oakland Athletics signed OF Herschel Powell. |
| Jun 13, 2012 | Signed | Lee Sosa | — | Athletics | Oakland Athletics signed RHP Lee Sosa. |
| Jun 13, 2012 | Signed | Chris Wolfe | — | Athletics | Oakland Athletics signed SS Chris Wolfe. |
| Jun 13, 2012 | Signed | John Wooten | — | Athletics | Oakland Athletics signed 1B John Wooten. |
| Jun 13, 2012 | Signed | Eric Wood | — | Pittsburgh Pirates | Pittsburgh Pirates signed 3B Eric Wood. |
| Jun 13, 2012 | Signed | Jacob Stallings | — | Pittsburgh Pirates | Pittsburgh Pirates signed C Jacob Stallings. |
| Jun 13, 2012 | Signed | Patrick Ludwig | — | Pittsburgh Pirates | Pittsburgh Pirates signed RHP Pat Ludwig. |
| Jun 13, 2012 | Signed | Dalton Friend | — | Pittsburgh Pirates | Pittsburgh Pirates signed LHP Dalton Friend. |
| Jun 13, 2012 | Signed | Tom Harlan | — | Pittsburgh Pirates | Pittsburgh Pirates signed LHP Thomas Harlan. |
| Jun 13, 2012 | Signed | Kyle Haynes | — | Pittsburgh Pirates | Pittsburgh Pirates signed Kyle Haynes. |
| Jun 13, 2012 | Signed | Lance Breedlove | — | Pittsburgh Pirates | Pittsburgh Pirates signed RHP Lance Breedlove. |
| Jun 13, 2012 | Signed | Josh D. Smith | — | Pittsburgh Pirates | Pittsburgh Pirates signed LHP Josh Smith. |
| Jun 13, 2012 | Signed | Nolan Gannon | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Nolan Gannon. |
| Jun 13, 2012 | Signed | Bralin Jackson | — | Tampa Bay Rays | Tampa Bay Rays signed CF Bralin Jackson. |
| Jun 13, 2012 | Signed | Marty Gantt | — | Tampa Bay Rays | Tampa Bay Rays signed OF Marty Gantt. |
| Jun 13, 2012 | Signed | Luke Maile | — | Tampa Bay Rays | Tampa Bay Rays signed CF Luke Maile. |
| Jun 13, 2012 | Signed | Sean Bierman | — | Tampa Bay Rays | Tampa Bay Rays signed LHP Sean Bierman. |
| Jun 13, 2012 | Signed | Clayton Henning | — | Tampa Bay Rays | Tampa Bay Rays signed CF Clayton Henning. |
| Jun 13, 2012 | Signed | Dylan Floro | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Dylan Floro. |
| Jun 13, 2012 | Signed | Willie Gabay | — | Tampa Bay Rays | Tampa Bay Rays signed RHP William Gabay. |
| Jun 13, 2012 | Signed | Thomas Coyle | — | Tampa Bay Rays | Tampa Bay Rays signed 2B Thomas Coyle. |
| Jun 13, 2012 | Signed | Kevin Brandt | — | Tampa Bay Rays | Tampa Bay Rays signed LHP Kevin Brandt. |
| Jun 13, 2012 | Signed | Miguel Beltran | — | Tampa Bay Rays | Tampa Bay Rays signed 1B Miguel Beltran. |
| Jun 13, 2012 | Signed | Randy Davis | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Randy Davis. |
| Jun 13, 2012 | Signed | Jonathan Weaver | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Jonathan Weaver. |
| Jun 13, 2012 | Signed | Willie Argo | — | Tampa Bay Rays | Tampa Bay Rays signed OF Willie Argo. |
| Jun 13, 2012 | Signed | Reid Redman | — | Tampa Bay Rays | Tampa Bay Rays signed 3B Reid Redman. |
| Jun 13, 2012 | Signed | Jordan Harrison | — | Tampa Bay Rays | Tampa Bay Rays signed LHP Jordan Harrison. |
| Jun 13, 2012 | Signed | Dayne Quist | — | Tampa Bay Rays | Tampa Bay Rays signed LHP Dayne Quist. |
| Jun 13, 2012 | Signed | Michael Williams | — | Tampa Bay Rays | Tampa Bay Rays signed C Michael Williams. |
| Jun 13, 2012 | Signed | Ben Kline | — | Tampa Bay Rays | Tampa Bay Rays signed SS Ben Kline. |
| Jun 13, 2012 | Signed | Ryan Garton | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Ryan Garton. |
| Jun 13, 2012 | Signed | Kris Carlson | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Kris Carlson. |
| Jun 13, 2012 | Signed | Rob Finneran | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Rob Finneran. |
| Jun 13, 2012 | Signed | Geoff Rowan | — | Tampa Bay Rays | Tampa Bay Rays signed C Geoff Rowan. |
| Jun 13, 2012 | Signed | Nick Sawyer | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Nick Sawyer. |
| Jun 13, 2012 | Signed | Drew Harrelson | — | San Diego Padres | San Diego Padres signed LHP Drew Harrelson. |
| Jun 13, 2012 | Signed | Jalen Goree | — | San Diego Padres | San Diego Padres signed SS Jalen Goree. |
| Jun 13, 2012 | Signed | Travis Ballew | — | Houston Astros | Houston Astros signed RHP Travis Ballew. |
| Jun 13, 2012 | Signed | Joe Bircher | — | Houston Astros | Houston Astros signed LHP Joe Bircher. |
| Jun 13, 2012 | Signed | Kenny Long | — | Houston Astros | Houston Astros signed LHP Kenny Long. |
| Jun 13, 2012 | Signed | Tyler Mizenko | — | San Francisco Giants | San Francisco Giants signed RHP Tyler Mizenko. |
| Jun 13, 2012 | Signed | Ryan Dineen | — | Houston Astros | Houston Astros signed SS Ryan Dineen. |
| Jun 13, 2012 | Signed as free agent | Brian Blasik | — | Houston Astros | Houston Astros signed free agent SS Brian Blasik to a minor league contract. |
| Jun 13, 2012 | Signed | Marc Wik | — | Houston Astros | Houston Astros signed OF Marc Wik. |
| Jun 13, 2012 | Signed | Brett Phillips | — | Houston Astros | Houston Astros signed OF Brett Phillips. |
| Jun 13, 2012 | Signed | Jake Hermsen | — | Los Angeles Dodgers | Los Angeles Dodgers signed LHP Jake Hermsen. |
| Jun 13, 2012 | Signed | Owen Jones | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP Owen Jones. |
| Jun 13, 2012 | Signed | Darnell Sweeney | — | Los Angeles Dodgers | Los Angeles Dodgers signed SS Darnell Sweeney. |
| Jun 13, 2012 | Signed | Adam Paulencu | — | Colorado Rockies | Colorado Rockies signed RHP Adam Paulencu. |
| Jun 13, 2012 | Signed | Seth Willoughby | — | Colorado Rockies | Colorado Rockies signed RHP Seth Willoughby. |
| Jun 13, 2012 | Signed | Tom Murphy | — | Colorado Rockies | Colorado Rockies signed C Tom Murphy. |
| Jun 13, 2012 | Signed | Derek Jones | — | Colorado Rockies | Colorado Rockies signed OF Derek Jones. |
| Jun 13, 2012 | Signed | Kenny Diekroeger | — | Kansas City Royals | Kansas City Royals signed SS Kenny Diekroeger. |
| Jun 13, 2012 | Signed as free agent | Yunior De La Cruz | — | Milwaukee Brewers | Milwaukee Brewers signed free agent C Yunior De La Cruz to a minor league contract. |
| Jun 13, 2012 | Signed as free agent | Jose Dicent | — | Milwaukee Brewers | Milwaukee Brewers signed free agent 3B Jose Dicent to a minor league contract. |
| Jun 13, 2012 | Signed | Mike Mudron | — | Washington Nationals | Washington Nationals signed RHP Mike Mudron. |
| Jun 13, 2012 | Signed | Richard Stock | — | Cleveland Guardians | Cleveland Indians signed C Richard Stock. |
| Jun 13, 2012 | Signed | Jason Wilson | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Jason Wilson. |
| Jun 13, 2012 | Signed as free agent | Kyle Anderson | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Kyle Anderson to a minor league contract. |
| Jun 13, 2012 | Signed as free agent | Tim Remes | — | Detroit Tigers | Detroit Tigers signed free agent C Tim Remes to a minor league contract. |
| Jun 13, 2012 | Signed as free agent | Jordan Walton | — | St. Louis Cardinals | St. Louis Cardinals signed free agent OF Jordan Walton to a minor league contract. |
| Jun 13, 2012 | Signed as free agent | Joe Lopez | — | Kansas City Royals | Kansas City Royals signed free agent RHP Joe Lopez to a minor league contract. |
| Jun 13, 2012 | Signed | Kaleb Merck | — | Minnesota Twins | Minnesota Twins signed RHP Kaleb Merck. |
| Jun 12, 2012 | Signed | Lewis Brinson | — | Texas Rangers | Texas Rangers signed OF Lewis Brinson. |
| Jun 12, 2012 | Signed | Joey Gallo | — | Texas Rangers | Texas Rangers signed 3B Joey Gallo. |
| Jun 12, 2012 | Signed | Collin Wiles | — | Texas Rangers | Texas Rangers signed RHP Collin Wiles. |
| Jun 12, 2012 | Signed | Jamie Jarmon | — | Texas Rangers | Texas Rangers signed OF Jamie Jarmon. |
| Jun 12, 2012 | Signed | Nick Williams | — | Texas Rangers | Texas Rangers signed OF Nick Williams. |
| Jun 12, 2012 | Signed | Tony Renda | — | Washington Nationals | Washington Nationals signed 2B Tony Renda. |
| Jun 12, 2012 | Signed | Brandon Miller | — | Washington Nationals | Washington Nationals signed OF Brandon Miller. |
| Jun 12, 2012 | Signed | Spencer Kieboom | — | Washington Nationals | Washington Nationals signed C Spencer Kieboom. |
| Jun 12, 2012 | Signed | Hayden Jennings | — | Washington Nationals | Washington Nationals signed OF Hayden Jennings. |
| Jun 12, 2012 | Signed | Derek Self | — | Washington Nationals | Washington Nationals signed RHP Derek Self. |
| Jun 12, 2012 | Signed | Craig Manuel | — | Washington Nationals | Washington Nationals signed C Craig Manuel. |
| Jun 12, 2012 | Signed | Brian Rauh | — | Washington Nationals | Washington Nationals signed RHP Brian Rauh. |
| Jun 12, 2012 | Signed | Carlos Lopez | — | Washington Nationals | Washington Nationals signed 3B Carlos Lopez. |
| Jun 12, 2012 | Signed | Elliott Waterman | — | Washington Nationals | Washington Nationals signed LHP Elliott Waterman. |
| Jun 12, 2012 | Signed | Jordan Poole | — | Washington Nationals | Washington Nationals signed RF Jordan Poole. |
| Jun 12, 2012 | Signed | Ronald Peña | — | Washington Nationals | Washington Nationals signed RHP Ronald Pena. |
| Jun 12, 2012 | Signed | Blake Schwartz | — | Washington Nationals | Washington Nationals signed RHP Blake Schwartz. |
| Jun 12, 2012 | Signed | David Fischer | — | Washington Nationals | Washington Nationals signed RHP David Fischer. |
| Jun 12, 2012 | Signed | Bryan Lippincott | — | Washington Nationals | Washington Nationals signed 1B Bryan Lippincott. |
| Jun 12, 2012 | Signed | James Brooks | — | Washington Nationals | Washington Nationals signed SS James Brooks. |
| Jun 12, 2012 | Signed | Austin Chubb | — | Washington Nationals | Washington Nationals signed C Austin Chubb. |
| Jun 12, 2012 | Signed | Will Hudgins | — | Washington Nationals | Washington Nationals signed RHP Will Hudgins. |
| Jun 12, 2012 | Signed | Casey Selsor | — | Washington Nationals | Washington Nationals signed OF Casey Selsor. |
| Jun 12, 2012 | Signed | Kevin Dicharry | — | Washington Nationals | Washington Nationals signed RHP Kevin Dicharry. |
| Jun 12, 2012 | Signed | Hunter Bailey | — | Washington Nationals | Washington Nationals signed SS Hunter Bailey. |
| Jun 12, 2012 | Signed | L.J. Hollins | — | Washington Nationals | Washington Nationals signed RHP L.J. Hollins. |
| Jun 12, 2012 | Signed | Michael Boyden | — | Washington Nationals | Washington Nationals signed RHP Michael Boyden. |
| Jun 12, 2012 | Signed | Mike McQuillan | — | Washington Nationals | Washington Nationals signed 2B Mike McQuillan. |
| Jun 12, 2012 | Signed | Keon Barnum | — | Chicago White Sox | Chicago White Sox signed 1B Keon Barnum. |
| Jun 12, 2012 | Signed | Chris Beck | — | Chicago White Sox | Chicago White Sox signed RHP Chris Beck. |
| Jun 12, 2012 | Signed | Joey DeMichele | — | Chicago White Sox | Chicago White Sox signed 2B Joey DeMichele. |
| Jun 12, 2012 | Signed | Brandon Brennan | — | Chicago White Sox | Chicago White Sox signed RHP Brandon Brennan. |
| Jun 12, 2012 | Signed | Nick Basto | — | Chicago White Sox | Chicago White Sox signed SS Nick Basto. |
| Jun 12, 2012 | Signed | Zach Isler | — | Chicago White Sox | Chicago White Sox signed RHP Zach Isler. |
| Jun 12, 2012 | Signed | Micah Johnson | — | Chicago White Sox | Chicago White Sox signed 2B Micah Johnson. |
| Jun 12, 2012 | Signed | Brandon Hardin | — | Chicago White Sox | Chicago White Sox signed RHP Brandon Hardin. |
| Jun 12, 2012 | Signed | Tony Bucciferro | — | Chicago White Sox | Chicago White Sox signed RHP Tony Bucciferro. |
| Jun 12, 2012 | Signed | Abe Ruiz | — | Chicago White Sox | Chicago White Sox signed 1B Abe Ruiz. |
| Jun 12, 2012 | Signed | Thomas McCarthy | — | Chicago White Sox | Chicago White Sox signed 3B Thomas McCarthy. |
| Jun 12, 2012 | Signed | Alex Williams | — | Chicago White Sox | Chicago White Sox signed 1B Alex Williams. |
| Jun 12, 2012 | Signed | Zach Voight | — | Chicago White Sox | Chicago White Sox signed SS Zach Voight. |
| Jun 12, 2012 | Signed | Adam Lopez | — | Chicago White Sox | Chicago White Sox signed RHP Adam Lopez. |
| Jun 12, 2012 | Signed | Cory McGinnis | — | Chicago White Sox | Chicago White Sox signed RHP Cory McGinnis. |
| Jun 12, 2012 | Signed | Kale Kiser | — | Chicago White Sox | Chicago White Sox signed OF Kale Kiser. |
| Jun 12, 2012 | Signed | Eric Grabe | — | Chicago White Sox | Chicago White Sox signed 2B Eric Grabe. |
| Jun 12, 2012 | Signed | Zachary Toney | — | Chicago White Sox | Chicago White Sox signed LHP Zachary Toney. |
| Jun 12, 2012 | Signed | Zach Fisher | — | Chicago White Sox | Chicago White Sox signed C Zach Fisher. |
| Jun 12, 2012 | Signed | James Hudelson | — | Chicago White Sox | Chicago White Sox signed RF James Hudelson. |
| Jun 12, 2012 | Signed | Jake Brown | — | Chicago White Sox | Chicago White Sox signed SS Jake Brown. |
| Jun 12, 2012 | Signed | Steven Nikorak | — | Chicago White Sox | Chicago White Sox signed 3B Steven Nikorak. |
| Jun 12, 2012 | Released | Marlon Byrd | — | Boston Red Sox | Boston Red Sox released CF Marlon Byrd. |
| Jun 12, 2012 | Signed | Corey Thompson | — | Chicago White Sox | Chicago White Sox signed 3B Corey Thompson. |
| Jun 12, 2012 | Signed | Kevin Plawecki | — | New York Mets | New York Mets signed C Kevin Plawecki. |
| Jun 12, 2012 | Trade | Esmil Rogers | Colorado Rockies | Cleveland Guardians | Colorado Rockies traded RHP Esmil Rogers to Cleveland Indians for cash. |
| Jun 12, 2012 | Signed as free agent | Rich Rundles | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Rich Rundles to a minor league contract. |
| Jun 12, 2012 | Signed as free agent | Jesus Merchan | — | San Diego Padres | San Diego Padres signed free agent SS Jesus Merchan to a minor league contract. |
| Jun 12, 2012 | Signed | Chris Stratton | — | San Francisco Giants | San Francisco Giants signed RHP Chris Stratton. |
| Jun 12, 2012 | Signed | Joe Kurrasch | — | San Francisco Giants | San Francisco Giants signed LHP Joe Kurrasch. |
| Jun 12, 2012 | Signed | Shilo McCall | — | San Francisco Giants | San Francisco Giants signed CF Shilo McCall. |
| Jun 12, 2012 | Signed | Jeremy Sy | — | San Francisco Giants | San Francisco Giants signed SS Jeremy Sy. |
| Jun 12, 2012 | Signed | Ryan Jones | — | San Francisco Giants | San Francisco Giants signed 2B Ryan Jones. |
| Jun 12, 2012 | Signed | Leo Rojas | — | San Francisco Giants | San Francisco Giants signed C Leonardo Rojas. |
| Jun 12, 2012 | Signed | Ian Gardeck | — | San Francisco Giants | San Francisco Giants signed RHP Ian Gardeck. |
| Jun 12, 2012 | Signed | Chris Johnson | — | San Francisco Giants | San Francisco Giants signed RHP Chris Johnson. |
| Jun 12, 2012 | Signed | Matt Duffy | — | San Francisco Giants | San Francisco Giants signed SS Matt Duffy. |
| Jun 12, 2012 | Signed | Randy Zeigler | — | San Francisco Giants | San Francisco Giants signed LHP Randy Zeigler. |
| Jun 12, 2012 | Signed | Ben Turner | — | San Francisco Giants | San Francisco Giants signed C Ben Turner. |
| Jun 12, 2012 | Signed | Brennan Metzger | — | San Francisco Giants | San Francisco Giants signed CF Brennan Metzger. |
| Jun 12, 2012 | Signed | Drew Leenhouts | — | San Francisco Giants | San Francisco Giants signed LHP Andrew Leenhouts. |
| Jun 12, 2012 | Signed | Andrew Cain | — | San Francisco Giants | San Francisco Giants signed CF Andrew Cain. |
| Jun 12, 2012 | Signed | Sam Eberle | — | San Francisco Giants | San Francisco Giants signed C Sam Eberle. |
| Jun 12, 2012 | Signed | Mason McVay | — | San Francisco Giants | San Francisco Giants signed LHP Mason McVay. |
| Jun 12, 2012 | Signed | Chris Fern | — | San Francisco Giants | San Francisco Giants signed LHP Chris Fern. |
| Jun 12, 2012 | Signed | Joseph Rapp | — | San Francisco Giants | San Francisco Giants signed 1B Joseph Rapp. |
| Jun 12, 2012 | Signed | Shayne Houck | — | San Francisco Giants | San Francisco Giants signed OF Shayne Houck. |
| Jun 12, 2012 | Signed | Jason Forjet | — | San Francisco Giants | San Francisco Giants signed RHP Jason Forjet. |
| Jun 12, 2012 | Signed | Chris Pickering | — | San Francisco Giants | San Francisco Giants signed LHP Chris Pickering. |
| Jun 12, 2012 | Signed | Brandon Farley | — | San Francisco Giants | San Francisco Giants signed RHP Brandon Farley. |
| Jun 12, 2012 | Signed | River Stevens | — | San Diego Padres | San Diego Padres signed 2B River Stevens. |
| Jun 12, 2012 | Signed | Patrick Conroy | — | Kansas City Royals | Kansas City Royals signed LHP Patrick Conroy. |
| Jun 12, 2012 | Signed | Lincoln Rassi | — | Kansas City Royals | Kansas City Royals signed RHP Lincoln Rassi. |
| Jun 12, 2012 | Signed as free agent | Alex Hudak | — | Kansas City Royals | Kansas City Royals signed free agent OF Alex Hudak to a minor league contract. |
| Jun 12, 2012 | Signed as free agent | Torey Deshazier | — | Kansas City Royals | Kansas City Royals signed free agent RHP Torey Deshazier to a minor league contract. |
| Jun 12, 2012 | Signed | Sam Selman | — | Kansas City Royals | Kansas City Royals signed LHP Sam Selman. |
| Jun 12, 2012 | Signed | Eric Brooks | — | Texas Rangers | Texas Rangers signed RHP Eric Brooks. |
| Jun 12, 2012 | Signed as free agent | Connor Sadzeck | — | Texas Rangers | Texas Rangers signed free agent RHP Connor Sadzeck to a minor league contract. |
| Jun 12, 2012 | Signed | Josh Ludy | — | Philadelphia Phillies | Philadelphia Phillies signed C Josh Ludy. |
| Jun 12, 2012 | Signed | Shaun Cooper | — | Arizona Diamondbacks | Arizona Diamondbacks signed OF Shaun Cooper. |
| Jun 12, 2012 | Signed | Stephen Perez | — | Washington Nationals | Washington Nationals signed SS Stephen Perez. |
| Jun 12, 2012 | Signed | Anthony Bemboom | — | Los Angeles Angels | Los Angeles Angels signed C Anthony Bemboom. |
| Jun 12, 2012 | Signed as free agent | Will Piwnica-Worms | — | Washington Nationals | Washington Nationals signed free agent OF Will Piwnica-Worms to a minor league contract. |
| Jun 12, 2012 | Signed as free agent | Patrick Smith | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Patrick Smith to a minor league contract. |
| Jun 12, 2012 | Signed | Austin Nola | — | Miami Marlins | Miami Marlins signed SS Austin Nola. |
| Jun 12, 2012 | Signed | Cameron Flynn | — | Miami Marlins | Miami Marlins signed OF Cameron Flynn. |
| Jun 12, 2012 | Signed | Cory Jensen | — | Detroit Tigers | Detroit Tigers signed 2B Cory Jensen. |
| Jun 12, 2012 | Signed as free agent | Brandon Dorsett | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Brandon Dorsett to a minor league contract. |
| Jun 12, 2012 | Signed as free agent | Blake Mascarello | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LHP Blake Mascarello to a minor league contract. |
| Jun 12, 2012 | Signed | Zach Babitt | — | Los Angeles Dodgers | Los Angeles Dodgers signed 2B Zach Babitt. |
| Jun 12, 2012 | Signed as free agent | Mark Peterson | — | Kansas City Royals | Kansas City Royals signed free agent RHP Mark Peterson to a minor league contract. |
| Jun 12, 2012 | Signed as free agent | Alejandro Piloto | — | Atlanta Braves | Atlanta Braves signed free agent OF Alejandro Piloto to a minor league contract. |
| Jun 12, 2012 | Signed as free agent | Ping-Hsueh Chen | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Ping-Hsueh Chen to a minor league contract. |
| Jun 12, 2012 | Signed as free agent | Francisco Martinez | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Francisco Martinez to a minor league contract. |
| Jun 11, 2012 | Signed | Mallex Smith | — | San Diego Padres | San Diego Padres signed CF Mallex Smith. |
| Jun 11, 2012 | Signed | Stephen Carmon | — | San Diego Padres | San Diego Padres signed SS Stephen Carmon. |
| Jun 11, 2012 | Signed | Cory Bostjancic | — | San Diego Padres | San Diego Padres signed RHP Cory Bostjancic. |
| Jun 11, 2012 | Signed | R.J. Alvarez | — | Los Angeles Angels | Los Angeles Angels signed RHP R.J. Alvarez. |
| Jun 11, 2012 | Signed | Mark Sappington | — | Los Angeles Angels | Los Angeles Angels signed RHP Mark Sappington. |
| Jun 11, 2012 | Signed | Eric Stamets | — | Los Angeles Angels | Los Angeles Angels signed SS Eric Stamets. |
| Jun 11, 2012 | Signed | Chase Patterson | — | Los Angeles Angels | Los Angeles Angels signed C Chase Patterson. |
| Jun 11, 2012 | Signed | Zach Wright | — | Los Angeles Angels | Los Angeles Angels signed C Zach Wright. |
| Jun 11, 2012 | Signed | Quinten Davis | — | Los Angeles Angels | Los Angeles Angels signed CF Quinten Davis. |
| Jun 11, 2012 | Signed | Pat Lowery | — | Los Angeles Angels | Los Angeles Angels signed RHP Pat Lowery. |
| Jun 11, 2012 | Signed | Joel Capote | — | Los Angeles Angels | Los Angeles Angels signed CF Joel Capote. |
| Jun 11, 2012 | Signed | Zac Livingston | — | Los Angeles Angels | Los Angeles Angels signed C Zac Livingston. |
| Jun 11, 2012 | Signed | Pedro Pizarro | — | Los Angeles Angels | Los Angeles Angels signed C Pedro Pizarro. |
| Jun 11, 2012 | Signed | Kenny Hatcher | — | Los Angeles Angels | Los Angeles Angels signed RHP Kenny Hatcher. |
| Jun 11, 2012 | Signed | Ryan Harvey | — | Texas Rangers | Texas Rangers signed RHP Ryan Harvey. |
| Jun 11, 2012 | Signed | Brandon Kuter | — | Texas Rangers | Texas Rangers signed RHP Brandon Kuter. |
| Jun 11, 2012 | Signed | D.J. Davis | — | Toronto Blue Jays | Toronto Blue Jays signed OF D.J. Davis. |
| Jun 11, 2012 | Signed | Mitch Nay | — | Toronto Blue Jays | Toronto Blue Jays signed OF Mitch Nay. |
| Jun 11, 2012 | Signed | Tyler Gonzales | — | Toronto Blue Jays | Toronto Blue Jays signed RHP Tyler Gonzales. |
| Jun 11, 2012 | Signed | Anthony Alford | — | Toronto Blue Jays | Toronto Blue Jays signed OF Anthony Alford. |
| Jun 11, 2012 | Signed | Tucker Donahue | — | Toronto Blue Jays | Toronto Blue Jays signed RHP Tucker Donahue. |
| Jun 11, 2012 | Signed | Brad Delatte | — | Toronto Blue Jays | Toronto Blue Jays signed LHP Brad Delatte. |
| Jun 11, 2012 | Signed | Eric Phillips | — | Toronto Blue Jays | Toronto Blue Jays signed SS Eric Phillips. |
| Jun 11, 2012 | Signed | Ian Parmley | — | Toronto Blue Jays | Toronto Blue Jays signed OF Ian Parmley. |
| Jun 11, 2012 | Signed | Tucker Frawley | — | Toronto Blue Jays | Toronto Blue Jays signed C Tucker Frawley. |
| Jun 11, 2012 | Signed | Jordan Leyland | — | Toronto Blue Jays | Toronto Blue Jays signed 1B Jordan Leyland. |
| Jun 11, 2012 | Signed | Alex Azor | — | Toronto Blue Jays | Toronto Blue Jays signed OF Alex Azor. |
| Jun 11, 2012 | Signed | John Silviano | — | Toronto Blue Jays | Toronto Blue Jays signed C John Silviano. |
| Jun 11, 2012 | Signed | Zak Wasilewski | — | Toronto Blue Jays | Toronto Blue Jays signed LHP Zak Wasilewski. |
| Jun 11, 2012 | Signed | Shane Dawson | — | Toronto Blue Jays | Toronto Blue Jays signed LHP Shane Dawson. |
| Jun 11, 2012 | Signed | Jorge Flores | — | Toronto Blue Jays | Toronto Blue Jays signed SS Jorge Flores. |
| Jun 11, 2012 | Signed | D.J. Jones | — | Toronto Blue Jays | Toronto Blue Jays signed OF D.J. Jones. |
| Jun 11, 2012 | Signed | Colton Turner | — | Toronto Blue Jays | Toronto Blue Jays signed LHP Colton Turner. |
| Jun 11, 2012 | Signed | Jason Leblebijian | — | Toronto Blue Jays | Toronto Blue Jays signed SS Jason Leblebijian. |
| Jun 11, 2012 | Signed | Dan Klein | — | Toronto Blue Jays | Toronto Blue Jays signed C Daniel Klein. |
| Jun 11, 2012 | Signed | Derrick Chung | — | Toronto Blue Jays | Toronto Blue Jays signed SS Derrick Chung. |
| Jun 11, 2012 | Signed | Jorge Saez | — | Toronto Blue Jays | Toronto Blue Jays signed C Jorge Saez. |
| Jun 11, 2012 | Signed | Shaun Valeriote | — | Toronto Blue Jays | Toronto Blue Jays signed 3B Shaun Valeriote. |
| Jun 11, 2012 | Signed as free agent | Bobby Brosnahan | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Bobby Brosnahan to a minor league contract. |
| Jun 11, 2012 | Signed as free agent | Chuck Ghysels | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Chuck Ghysels to a minor league contract. |
| Jun 11, 2012 | Signed as free agent | Tim Brechbuehler | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Tim Brechbuehler to a minor league contract. |
| Jun 11, 2012 | Signed as free agent | Joe Spano | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Joe Spano to a minor league contract. |
| Jun 11, 2012 | Signed | Justin D'Alessandro | — | Toronto Blue Jays | Toronto Blue Jays signed RHP Justin D'Alessandro. |
| Jun 11, 2012 | Signed as free agent | Justin James | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Justin James to a minor league contract. |
| Jun 11, 2012 | Signed | Wyatt Mathisen | — | Pittsburgh Pirates | Pittsburgh Pirates signed C Wyatt Mathisen. |
| Jun 11, 2012 | Signed | Brian Adams | — | San Diego Padres | San Diego Padres signed OF Brian Adams. |
| Jun 11, 2012 | Signed | Malcom Diaz | — | San Diego Padres | San Diego Padres signed RHP Malcom Diaz. |
| Jun 11, 2012 | Signed | Christian Miller | — | San Diego Padres | San Diego Padres signed LHP Christian Miller. |
| Jun 11, 2012 | Signed | Chris O'Dowd | — | San Diego Padres | San Diego Padres signed C Chris O'Dowd. |
| Jun 11, 2012 | Signed | Tony Wieber | — | San Diego Padres | San Diego Padres signed RHP Tony Wieber. |
| Jun 11, 2012 | Signed | Wynton Bernard | — | San Diego Padres | San Diego Padres signed OF Wynton Bernard. |
| Jun 11, 2012 | Signed | Cristian Munoz | — | San Diego Padres | San Diego Padres signed C Cristian Munoz. |
| Jun 11, 2012 | Signed as free agent | Mark Picca | — | San Diego Padres | San Diego Padres signed free agent LHP Mark Picca to a minor league contract. |
| Jun 11, 2012 | Signed as free agent | Omir Santos | — | Colorado Rockies | Colorado Rockies signed free agent C Omir Santos to a minor league contract. |
| Jun 11, 2012 | Signed | Kevin Allen | — | Kansas City Royals | Kansas City Royals signed RHP Kevin Allen. |
| Jun 11, 2012 | Signed as free agent | Yeudis Penalo | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Yeudis Penalo to a minor league contract. |
| Jun 11, 2012 | Signed | Adrian Marin | — | Baltimore Orioles | Baltimore Orioles signed IF Adrian Marin. |
| Jun 11, 2012 | Signed | Torsten Boss | — | Baltimore Orioles | Baltimore Orioles signed Torsten Boss. |
| Jun 11, 2012 | Signed | Brady Wager | — | Baltimore Orioles | Baltimore Orioles signed RHP Brady Wager. |
| Jun 11, 2012 | Signed | Joel Hutter | — | Baltimore Orioles | Baltimore Orioles signed SS Joel Hutter. |
| Jun 11, 2012 | Signed | Sean McAdams | — | Baltimore Orioles | Baltimore Orioles signed RHP Sean McAdams. |
| Jun 11, 2012 | Signed | Tommy Richards | — | Baltimore Orioles | Baltimore Orioles signed 2B Tommy Richards. |
| Jun 11, 2012 | Signed | Anthony Caronia | — | Baltimore Orioles | Baltimore Orioles signed SS Anthony Caronia. |
| Jun 11, 2012 | Signed | Duke Porter | — | Baltimore Orioles | Baltimore Orioles signed LHP Duke Porter. |
| Jun 11, 2012 | Signed | Jack Graham | — | Baltimore Orioles | Baltimore Orioles signed Jack Graham. |
| Jun 11, 2012 | Signed | Jake Newberry | — | Kansas City Royals | Kansas City Royals signed RHP Jake Newberry. |
| Jun 11, 2012 | Signed | Dan Langfield | — | Cincinnati Reds | Cincinnati Reds signed RHP Dan Langfield. |
| Jun 11, 2012 | Signed | Jordan Remer | — | Cincinnati Reds | Cincinnati Reds signed LHP Jordan Remer. |
| Jun 11, 2012 | Signed | Joe Hudson | — | Cincinnati Reds | Cincinnati Reds signed C Joe Hudson. |
| Jun 11, 2012 | Signed | Nick Pasquale | — | Cleveland Guardians | Cleveland Indians signed RHP Nick Pasquale. |
| Jun 11, 2012 | Signed | Cody Penny | — | Cleveland Guardians | Cleveland Indians signed RHP Cody Penny. |
| Jun 11, 2012 | Signed | Brian Ellington | — | Miami Marlins | Miami Marlins signed RHP Brian Ellington. |
| Jun 11, 2012 | Signed | Javier Machuca | — | St. Louis Cardinals | St. Louis Cardinals signed LHP Javier Machuca. |
| Jun 11, 2012 | Signed | Brett Blaise | — | Tampa Bay Rays | Tampa Bay Rays signed LHP Brett Blaise. |
| Jun 11, 2012 | Signed as free agent | Kyle Pelchy | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Kyle Pelchy to a minor league contract. |
| Jun 11, 2012 | Signed as free agent | Ryan McChesney | — | Tampa Bay Rays | Tampa Bay Rays signed free agent C Ryan McChesney to a minor league contract. |
| Jun 11, 2012 | Signed as free agent | Blake Barber | — | Miami Marlins | Miami Marlins signed free agent 2B Blake Barber to a minor league contract. |
| Jun 11, 2012 | Signed | Caleb Frare | — | New York Yankees | New York Yankees signed LHP Caleb Frare. |
| Jun 11, 2012 | Signed as free agent | Wil Browning | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Wil Browning to a minor league contract. |
| Jun 11, 2012 | Signed as free agent | Chris Boydston | — | Chicago White Sox | Chicago White Sox signed free agent LHP Chris Boydston to a minor league contract. |
| Jun 11, 2012 | Signed | Austin Cowen | — | Los Angeles Dodgers | Los Angeles Dodgers signed C Austin Cowen. |
| Jun 11, 2012 | Signed | Miguel Concepcion | — | Atlanta Braves | Atlanta Braves signed LHP Miguel Concepcion. |
| Jun 10, 2012 | Signed | Fernando Perez | — | San Diego Padres | San Diego Padres signed 3B Fernando Perez. |
| Jun 10, 2012 | Signed | Andrew Brown | — | Colorado Rockies | Colorado Rockies signed RHP Andrew Brown. |
| Jun 10, 2012 | Signed | Shane Broyles | — | Colorado Rockies | Colorado Rockies signed RHP Shane Broyles. |
| Jun 10, 2012 | Signed | Ryan Arrowood | — | Colorado Rockies | Colorado Rockies signed RHP Ryan Arrowood. |
| Jun 10, 2012 | Signed | Alec Mehrten | — | Colorado Rockies | Colorado Rockies signed SS Alec Mehrten. |
| Jun 10, 2012 | Signed | Patrick Hutcheson | — | Colorado Rockies | Colorado Rockies signed 2B Patrick Hutcheson. |
| Jun 10, 2012 | Signed as free agent | Zach Osborne | — | Colorado Rockies | Colorado Rockies signed free agent SS Zach Osborne to a minor league contract. |
| Jun 10, 2012 | Signed | T.J. Oakes | — | Colorado Rockies | Colorado Rockies signed RHP T.J. Oakes. |
| Jun 10, 2012 | Signed | Shane Watson | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Shane Watson. |
| Jun 10, 2012 | Signed | Nic Hanson | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Nic Hanson. |
| Jun 10, 2012 | Signed | Geoff Broussard | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Geoff Broussard. |
| Jun 10, 2012 | Signed | Chad Carman | — | Philadelphia Phillies | Philadelphia Phillies signed C Chad Carman. |
| Jun 10, 2012 | Signed | J.T. Watkins | — | Boston Red Sox | Boston Red Sox signed C J.T. Watkins. |
| Jun 10, 2012 | Signed | Mike Miller | — | Boston Red Sox | Boston Red Sox signed SS Mike Miller. |
| Jun 10, 2012 | Signed | Nathan Minnich | — | Boston Red Sox | Boston Red Sox signed 1B Nathan Minnich. |
| Jun 10, 2012 | Signed | Mike Augliera | — | Boston Red Sox | Boston Red Sox signed RHP Mike Augliera. |
| Jun 10, 2012 | Signed | Dylan Chavez | — | Boston Red Sox | Boston Red Sox signed LHP Dylan Chavez. |
| Jun 10, 2012 | Signed | Justin Haley | — | Boston Red Sox | Boston Red Sox signed RHP Justin Haley. |
| Jun 10, 2012 | Signed | Kyle Kraus | — | Boston Red Sox | Boston Red Sox signed RHP Kyle Kraus. |
| Jun 10, 2012 | Signed as free agent | John Killen | — | Kansas City Royals | Kansas City Royals signed free agent LHP John Killen to a minor league contract. |
| Jun 10, 2012 | Signed | Alec Mills | — | Kansas City Royals | Kansas City Royals signed RHP Alec Mills. |
| Jun 10, 2012 | Signed as free agent | Kyle Koeneman | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent 1B Kyle Koeneman to a minor league contract. |
| Jun 10, 2012 | Signed | Patrick Merkling | — | Miami Marlins | Miami Marlins signed LHP Patrick Merkling. |
| Jun 10, 2012 | Signed | Justin Jirschele | — | Chicago White Sox | Chicago White Sox signed 3B Justin Jirschele. |
| Jun 10, 2012 | Signed as free agent | Brian Billigen | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent OF Brian Billigen to a minor league contract. |
| Jun 10, 2012 | Signed as free agent | Michael Rivera | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Michael Rivera to a minor league contract. |
| Jun 10, 2012 | Signed | Joshua Nervis | — | Cleveland Guardians | Cleveland Indians signed RHP Joshua Nervis. |
| Jun 9, 2012 | Signed | Patrick Wisdom | — | St. Louis Cardinals | St. Louis Cardinals signed 3B Patrick Wisdom. |
| Jun 9, 2012 | Signed | Steve Bean | — | St. Louis Cardinals | St. Louis Cardinals signed C Steve Bean. |
| Jun 9, 2012 | Signed | Tim Cooney | — | St. Louis Cardinals | St. Louis Cardinals signed LHP Tim Cooney. |
| Jun 9, 2012 | Signed | Kyle Barraclough | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Kyle Barraclough. |
| Jun 9, 2012 | Signed | Yoenny Gonzalez | — | St. Louis Cardinals | St. Louis Cardinals signed OF Yoenny Gonzalez. |
| Jun 9, 2012 | Signed | Rowan Wick | — | St. Louis Cardinals | St. Louis Cardinals signed C Rowan Wick. |
| Jun 9, 2012 | Signed | Jacob Wilson | — | St. Louis Cardinals | St. Louis Cardinals signed 3B Jacob Wilson. |
| Jun 9, 2012 | Signed | Brett Wiley | — | St. Louis Cardinals | St. Louis Cardinals signed SS Brett Wiley. |
| Jun 9, 2012 | Signed | Anthony Melchionda | — | St. Louis Cardinals | St. Louis Cardinals signed SS Anthony Melchionda. |
| Jun 9, 2012 | Signed | Bruce Caldwell | — | St. Louis Cardinals | St. Louis Cardinals signed 2B Bruce Caldwell. |
| Jun 9, 2012 | Signed | Joe Scanio | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Joseph Scanio. |
| Jun 9, 2012 | Signed | Chris Perry | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Chris Perry. |
| Jun 9, 2012 | Signed | Jeremy Schaffer | — | St. Louis Cardinals | St. Louis Cardinals signed 1B Jeremy Schaffer. |
| Jun 9, 2012 | Signed | Steven Gallardo | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Steven Gallardo. |
| Jun 9, 2012 | Signed | Matthew Young | — | St. Louis Cardinals | St. Louis Cardinals signed OF Matthew Young. |
| Jun 9, 2012 | Signed | Jacoby Almaraz | — | St. Louis Cardinals | St. Louis Cardinals signed 3B Jacoby Almaraz. |
| Jun 9, 2012 | Signed | Lee Stoppelman | — | St. Louis Cardinals | St. Louis Cardinals signed LHP Lee Stoppelman. |
| Jun 9, 2012 | Signed | Dixon Llorens | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Dixon Llorens. |
| Jun 9, 2012 | Signed | Steven Sabatino | — | St. Louis Cardinals | St. Louis Cardinals signed LHP Steven Sabatino. |
| Jun 9, 2012 | Signed | Joe Cuda | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Joe Cuda. |
| Jun 9, 2012 | Signed | Dodson McPherson | — | St. Louis Cardinals | St. Louis Cardinals signed OF Dodson McPherson. |
| Jun 9, 2012 | Signed | Kyle Helisek | — | St. Louis Cardinals | St. Louis Cardinals signed LHP Kyle Helisek. |
| Jun 9, 2012 | Signed | Joey Donofrio | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Joey Donofrio. |
| Jun 9, 2012 | Signed | Ronnie Shaban | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Ronnie Shaban. |
| Jun 9, 2012 | Signed | Mark Trentacosta | — | St. Louis Cardinals | St. Louis Cardinals signed LHP Mark Trentacosta. |
| Jun 9, 2012 | Signed | Ben O'Shea | — | St. Louis Cardinals | St. Louis Cardinals signed LHP Ben O'Shea. |
| Jun 9, 2012 | Signed | Michael Aldrete | — | St. Louis Cardinals | St. Louis Cardinals signed RHP Michael Aldrete. |
| Jun 9, 2012 | Signed as free agent | Jeff Francis | — | Colorado Rockies | Colorado Rockies signed free agent LHP Jeff Francis. |
| Jun 9, 2012 | Signed as free agent | Jamie Moyer | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Jamie Moyer to a minor league contract. |
| Jun 9, 2012 | Signed | Stryker Trahan | — | Arizona Diamondbacks | Arizona Diamondbacks signed C Stryker Trahan. |
| Jun 9, 2012 | Signed | Joe Munoz | — | Arizona Diamondbacks | Arizona Diamondbacks signed SS Joe Munoz. |
| Jun 9, 2012 | Signed | Jake Barrett | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Jake Barrett. |
| Jun 9, 2012 | Signed | Chuck Taylor | — | Arizona Diamondbacks | Arizona Diamondbacks signed OF Chuck Taylor. |
| Jun 9, 2012 | Signed | Ronnie Freeman | — | Arizona Diamondbacks | Arizona Diamondbacks signed C Ronnie Freeman. |
| Jun 9, 2012 | Signed | Jake Lamb | — | Arizona Diamondbacks | Arizona Diamondbacks signed SS Jake Lamb. |
| Jun 9, 2012 | Signed | Jeff Gibbs | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Jeff Gibbs. |
| Jun 9, 2012 | Signed | Daniel Poma | — | Arizona Diamondbacks | Arizona Diamondbacks signed OF Daniel Poma. |
| Jun 9, 2012 | Signed | Ben Eckels | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Ben Eckels. |
| Jun 9, 2012 | Signed | Alex Glenn | — | Arizona Diamondbacks | Arizona Diamondbacks signed OF Alex Glenn. |
| Jun 9, 2012 | Signed | Phildrick Llewellyn | — | Arizona Diamondbacks | Arizona Diamondbacks signed C Phildrick Llewellyn. |
| Jun 9, 2012 | Signed | Derrick Stultz | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Derrick Stultz. |
| Jun 9, 2012 | Signed | Blake Forslund | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Blake Forslund. |
| Jun 9, 2012 | Signed | Yogey Perez-Ramos | — | Arizona Diamondbacks | Arizona Diamondbacks signed OF Yogey Perez-Ramos. |
| Jun 9, 2012 | Signed | Kevin Medrano | — | Arizona Diamondbacks | Arizona Diamondbacks signed 2B Kevin Medrano. |
| Jun 9, 2012 | Signed | RJ Hively | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP RJ Hively. |
| Jun 9, 2012 | Signed | Jacob House | — | Arizona Diamondbacks | Arizona Diamondbacks signed 1B Jacob House. |
| Jun 9, 2012 | Signed | Mark Ginther | — | Arizona Diamondbacks | Arizona Diamondbacks signed 3B Mark Ginther. |
| Jun 9, 2012 | Signed | Vince Spilker | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Vince Spilker. |
| Jun 9, 2012 | Signed | Chris Capper | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Chris Capper. |
| Jun 9, 2012 | Signed | Adam McConnell | — | Arizona Diamondbacks | Arizona Diamondbacks signed SS Adam McConnell. |
| Jun 9, 2012 | Signed | Chase Stevens | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Chase Stevens. |
| Jun 9, 2012 | Signed | Andrew Potter | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Andrew Potter. |
| Jun 9, 2012 | Signed | Daniel Watts | — | Arizona Diamondbacks | Arizona Diamondbacks signed LHP Daniel Watts. |
| Jun 9, 2012 | Signed | Jonathan Pulley | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Jonathan Pulley. |
| Jun 9, 2012 | Signed | Jared Ray | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Jared Ray. |
| Jun 9, 2012 | Signed | Robbie Buller | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Robbie Buller. |
| Jun 9, 2012 | Signed | Andrew Barbosa | — | Arizona Diamondbacks | Arizona Diamondbacks signed LHP Andrew Barbosa. |
| Jun 9, 2012 | Signed | Breland Almadova | — | Arizona Diamondbacks | Arizona Diamondbacks signed OF Breland Almadova. |
| Jun 9, 2012 | Signed | Bubu Garcia | — | Arizona Diamondbacks | Arizona Diamondbacks signed C Bubu Garcia. |
| Jun 9, 2012 | Signed | Bruce Maxwell | — | Athletics | Oakland Athletics signed C Bruce Maxwell. |
| Jun 9, 2012 | Signed | Kris Hall | — | Athletics | Oakland Athletics signed RHP Kris Hall. |
| Jun 9, 2012 | Signed | Matt Hillsinger | — | Athletics | Oakland Athletics signed OF Matthew Hillsinger. |
| Jun 9, 2012 | Signed | Ryan Dull | — | Athletics | Oakland Athletics signed RHP Ryan Dull. |
| Jun 9, 2012 | Signed | Daniel Minor | — | Houston Astros | Houston Astros signed RHP Daniel Minor. |
| Jun 9, 2012 | Signed | Dan Gulbransen | — | Houston Astros | Houston Astros signed OF Dan Gulbransen. |
| Jun 9, 2012 | Signed | Aaron West | — | Houston Astros | Houston Astros signed RHP Aaron West. |
| Jun 9, 2012 | Signed | Austin Elkins | — | Houston Astros | Houston Astros signed IF Austin Elkins. |
| Jun 9, 2012 | Signed | Angel Ibanez | — | Houston Astros | Houston Astros signed 3B Angel Ibanez. |
| Jun 9, 2012 | Signed | Christian Garcia | — | Houston Astros | Houston Astros signed RHP Christian Garcia. |
| Jun 9, 2012 | Signed | Jordan Jankowski | — | Houston Astros | Houston Astros signed RHP Jordan Jankowski. |
| Jun 9, 2012 | Signed | Michael Dimock | — | Houston Astros | Houston Astros signed RHP Michael Dimock. |
| Jun 9, 2012 | Signed | Joe Church | — | San Diego Padres | San Diego Padres signed RHP Joe Church. |
| Jun 9, 2012 | Signed | Chris Burke | — | San Diego Padres | San Diego Padres signed 3B Chris Burke. |
| Jun 9, 2012 | Signed | Cam Stewart | — | San Diego Padres | San Diego Padres signed RHP Cam Stewart. |
| Jun 9, 2012 | Signed | Matthew Chabot | — | San Diego Padres | San Diego Padres signed RHP Matthew Chabot. |
| Jun 9, 2012 | Signed | Brandon Alger | — | San Diego Padres | San Diego Padres signed LHP Brandon Alger. |
| Jun 9, 2012 | Signed | Goose Kallunki | — | San Diego Padres | San Diego Padres signed 3B Goose Kallunki. |
| Jun 9, 2012 | Signed | Eric Charles | — | San Diego Padres | San Diego Padres signed 2B Eric Charles. |
| Jun 9, 2012 | Signed | Matthew Shepherd | — | San Diego Padres | San Diego Padres signed RHP Matthew Shepherd. |
| Jun 9, 2012 | Signed | Alexi Colon | — | San Diego Padres | San Diego Padres signed OF Alexi Colon. |
| Jun 9, 2012 | Signed | Adam Ford | — | San Diego Padres | San Diego Padres signed SS Adam Ford. |
| Jun 9, 2012 | Signed | Anthony Renteria | — | San Diego Padres | San Diego Padres signed OF Anthony Renteria. |
| Jun 9, 2012 | Signed | Griffin Russell | — | San Diego Padres | San Diego Padres signed LHP Griffin Russell. |
| Jun 9, 2012 | Signed | Kevin Brady | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Kevin Brady. |
| Jun 9, 2012 | Signed | Ashton Goudeau | — | Kansas City Royals | Kansas City Royals signed RHP Ashton Goudeau. |
| Jun 9, 2012 | Signed | MO Wiley | — | Cincinnati Reds | Cincinnati Reds signed RHP MO Wiley. |
| Jun 9, 2012 | Signed | Jacob Lee | — | Cleveland Guardians | Cleveland Indians signed RHP Jacob Lee. |
| Jun 9, 2012 | Signed | Michael Peoples | — | Cleveland Guardians | Cleveland Indians signed RHP Michael Peoples. |
| Jun 9, 2012 | Signed | Matt Milroy | — | Miami Marlins | Miami Marlins signed RHP Matt Milroy. |
| Jun 9, 2012 | Signed | Ronald Barnes | — | Miami Marlins | Miami Marlins signed RHP Ronald Barnes. |
| Jun 9, 2012 | Signed | Mike Flores | — | Atlanta Braves | Atlanta Braves signed RHP Mike Flores. |
| Jun 9, 2012 | Signed | Joel Licon | — | Minnesota Twins | Minnesota Twins signed SS Joel Licon. |
| Jun 9, 2012 | Signed | Saxon Butler | — | New York Yankees | New York Yankees signed 1B Saxon Butler. |
| Jun 9, 2012 | Signed as free agent | Harry Marino | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent LHP Harry Marino to a minor league contract. |
| Jun 9, 2012 | Signed as free agent | Jeremy Dowdy | — | Chicago White Sox | Chicago White Sox signed free agent C Jeremy Dowdy to a minor league contract. |
| Jun 9, 2012 | Signed | Theo Alexander | — | Los Angeles Dodgers | Los Angeles Dodgers signed OF Theo Alexander. |
| Jun 9, 2012 | Signed | Lindsey Caughel | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP Lindsey Caughel. |
| Jun 9, 2012 | Signed as free agent | Travis Jones | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Travis Jones to a minor league contract. |
| Jun 9, 2012 | Signed | Evan Marzilli | — | Arizona Diamondbacks | Arizona Diamondbacks signed CF Evan Marzilli. |
| Jun 9, 2012 | Signed | Andrew Velazquez | — | Arizona Diamondbacks | Arizona Diamondbacks signed SS Andrew Velazquez. |
| Jun 8, 2012 | Trade | Kris Watts | Pittsburgh Pirates | Washington Nationals | Pittsburgh Pirates traded C Kris Watts to Washington Nationals for cash. |
| Jun 8, 2012 | Signed | Gavin Cecchini | — | New York Mets | New York Mets signed SS Gavin Cecchini. |
| Jun 8, 2012 | Signed | Andrew Aplin | — | Houston Astros | Houston Astros signed OF Andrew Aplin. |
| Jun 8, 2012 | Signed | Terrell Joyce | — | Houston Astros | Houston Astros signed OF Terrell Joyce. |
| Jun 8, 2012 | Signed | Brian Holmes | — | Houston Astros | Houston Astros signed LHP Brian Holmes. |
| Jun 8, 2012 | Signed | Joe Sclafani | — | Houston Astros | Houston Astros signed SS Joe Sclafani. |
| Jun 8, 2012 | Signed | Erick Gonzalez | — | Houston Astros | Houston Astros signed RHP Erick Gonzalez. |
| Jun 8, 2012 | Signed | Ricky Gingras | — | Houston Astros | Houston Astros signed C Ricky Gingras. |
| Jun 8, 2012 | Signed | John Neely | — | Houston Astros | Houston Astros signed RHP John Neely. |
| Jun 8, 2012 | Signed | M.P. Cokinos | — | Houston Astros | Houston Astros signed C MP Cokinos. |
| Jun 8, 2012 | Signed | BJ Boyd | — | Athletics | Oakland Athletics signed CF B.J. Boyd. |
| Jun 8, 2012 | Signed | Cody Kurz | — | Athletics | Oakland Athletics signed RHP Cody Kurz. |
| Jun 8, 2012 | Signed | Brett Vertigan | — | Athletics | Oakland Athletics signed CF Brett Vertigan. |
| Jun 8, 2012 | Signed | Stuart Pudenz | — | Athletics | Oakland Athletics signed RHP Stuart Pudenz. |
| Jun 8, 2012 | Signed | Austin House | — | Athletics | Oakland Athletics signed RHP Austin House. |
| Jun 8, 2012 | Signed | Vince Voiro | — | Athletics | Oakland Athletics signed RHP Vincent Voiro. |
| Jun 8, 2012 | Signed | Tyler Hollstegge | — | Athletics | Oakland Athletics signed RHP Tyler Hollstegge. |
| Jun 8, 2012 | Signed | Tucker Healy | — | Athletics | Oakland Athletics signed RHP Tucker Healy. |
| Jun 8, 2012 | Signed | Kayvon Bahramzadeh | — | Athletics | Oakland Athletics signed RHP Kayvon Bahramzadeh. |
| Jun 8, 2012 | Signed | Derek Hansen | — | Athletics | Oakland Athletics signed RHP Derek Hansen. |
| Jun 8, 2012 | Signed | Phil Pohl | — | Athletics | Oakland Athletics signed C Philip Pohl. |
| Jun 8, 2012 | Signed | Taylor Massey | — | Athletics | Oakland Athletics signed LHP Taylor Massey. |
| Jun 8, 2012 | Signed | Ryan Gorton | — | Athletics | Oakland Athletics signed C Ryan Gorton. |
| Jun 8, 2012 | Signed | Clint Coulter | — | Milwaukee Brewers | Milwaukee Brewers signed C Clint Coulter. |
| Jun 8, 2012 | Signed | Victor Roache | — | Milwaukee Brewers | Milwaukee Brewers signed OF Victor Roache. |
| Jun 8, 2012 | Released | Scott Linebrink | — | St. Louis Cardinals | St. Louis Cardinals released RHP Scott Linebrink. |
| Jun 8, 2012 | Signed | Zach Lovvorn | — | Kansas City Royals | Kansas City Royals signed RHP Zach Lovvorn. |
| Jun 8, 2012 | Signed | Hunter Haynes | — | Kansas City Royals | Kansas City Royals signed LHP Hunter Haynes. |
| Jun 8, 2012 | Signed | Johnny Walter | — | Kansas City Royals | Kansas City Royals signed RHP John Walter. |
| Jun 8, 2012 | Signed | Nick Routt | — | Cincinnati Reds | Cincinnati Reds signed LHP Nick Routt. |
| Jun 8, 2012 | Signed | Louis Head | — | Cleveland Guardians | Cleveland Indians signed RHP Louis Head. |
| Jun 8, 2012 | Signed | Nick Wittgren | — | Miami Marlins | Miami Marlins signed RHP Nick Wittgren. |
| Jun 8, 2012 | Signed | David Cruz | — | Miami Marlins | Miami Marlins signed C David Cruz. |
| Jun 8, 2012 | Signed | Justin Jackson | — | Miami Marlins | Miami Marlins signed RHP Justin Jackson. |
| Jun 8, 2012 | Signed | Dane Stone | — | Miami Marlins | Miami Marlins signed RHP Dane Stone. |
| Jun 8, 2012 | Signed | Christian Rivera | — | Miami Marlins | Miami Marlins signed 2B Christian Rivera. |
| Jun 8, 2012 | Signed | K.C. Clabough | — | Atlanta Braves | Atlanta Braves signed SS K.C. Clabough. |
| Jun 8, 2012 | Signed | Bryan De La Rosa | — | Atlanta Braves | Atlanta Braves signed C Bryan De La Rosa. |
| Jun 8, 2012 | Signed | Jaden Dillon | — | Atlanta Braves | Atlanta Braves signed RHP Jaden Dillon. |
| Jun 8, 2012 | Signed | Mike Dodig | — | Atlanta Braves | Atlanta Braves signed 3B Mike Dodig. |
| Jun 8, 2012 | Signed | Connor Lien | — | Atlanta Braves | Atlanta Braves signed OF Connor Lien. |
| Jun 8, 2012 | Signed | Brandon Rohde | — | Atlanta Braves | Atlanta Braves signed LHP Brandon Rohde. |
| Jun 8, 2012 | Signed | Steven Schils | — | Atlanta Braves | Atlanta Braves signed RHP Steven Schils. |
| Jun 8, 2012 | Signed | Shae Simmons | — | Atlanta Braves | Atlanta Braves signed RHP Shae Simmons. |
| Jun 8, 2012 | Signed as free agent | Kyle Owings | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Kyle Owings to a minor league contract. |
| Jun 8, 2012 | Signed as free agent | Ryan Fuller | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent 3B Ryan Fuller to a minor league contract. |
| Jun 7, 2012 | Signed as free agent | Matt Wright | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Matt Wright to a minor league contract. |
| Jun 7, 2012 | Signed | Lucas Sims | — | Atlanta Braves | Atlanta Braves signed RHP Lucas Sims. |
| Jun 7, 2012 | Signed | Kyle Zimmer | — | Kansas City Royals | Kansas City Royals signed RHP Kyle Zimmer. |
| Jun 7, 2012 | Signed | Alec Asher | — | Texas Rangers | Texas Rangers signed RHP Alec Asher. |
| Jun 7, 2012 | Signed | Preston Beck | — | Texas Rangers | Texas Rangers signed OF Preston Beck. |
| Jun 7, 2012 | Signed | Royce Bolinger | — | Texas Rangers | Texas Rangers signed OF Royce Bolinger. |
| Jun 7, 2012 | Signed | Cam Schiller | — | Texas Rangers | Texas Rangers signed 2B Cam Schiller. |
| Jun 7, 2012 | Signed | Cody Kendall | — | Texas Rangers | Texas Rangers signed RHP Cody Kendall. |
| Jun 7, 2012 | Signed | John Niggli | — | Texas Rangers | Texas Rangers signed RHP John Niggli. |
| Jun 7, 2012 | Signed | Casey Shiver | — | Texas Rangers | Texas Rangers signed RHP Casey Shiver. |
| Jun 7, 2012 | Signed | Keone Kela | — | Texas Rangers | Texas Rangers signed RHP Keone Kela. |
| Jun 7, 2012 | Signed | Sam Stafford | — | Texas Rangers | Texas Rangers signed LHP Sam Stafford. |
| Jun 7, 2012 | Signed | Janluis Castro | — | Texas Rangers | Texas Rangers signed 2B Janluis Castro. |
| Jun 7, 2012 | Signed | Chuck Moorman | — | Texas Rangers | Texas Rangers signed C Chuck Moorman. |
| Jun 7, 2012 | Signed | Josh McElwee | — | Texas Rangers | Texas Rangers signed RHP Josh McElwee. |
| Jun 7, 2012 | Signed | Coby Cowgill | — | Texas Rangers | Texas Rangers signed RHP Coby Cowgill. |
| Jun 7, 2012 | Signed | Gabriel Roa | — | Texas Rangers | Texas Rangers signed SS Gabriel Roa. |
| Jun 7, 2012 | Signed | Austen Thrailkill | — | Texas Rangers | Texas Rangers signed LHP Austen Thrailkill. |
| Jun 7, 2012 | Signed | Joe Burns | — | Texas Rangers | Texas Rangers signed LHP Joe Burns. |
| Jun 7, 2012 | Signed | Barrett Serrato | — | Texas Rangers | Texas Rangers signed OF Barrett Serrato. |
| Jun 7, 2012 | Signed | Paul Schwendel | — | Texas Rangers | Texas Rangers signed RHP Paul Schwendel. |
| Jun 7, 2012 | Signed | Carlos Correa | — | Houston Astros | Houston Astros signed SS Carlos Correa. |
| Jun 7, 2012 | Signed | Dylan Cozens | — | Philadelphia Phillies | Philadelphia Phillies signed OF Dylan Cozens. |
| Jun 7, 2012 | Signed | Cameron Perkins | — | Philadelphia Phillies | Philadelphia Phillies signed OF Cameron Perkins. |
| Jun 7, 2012 | Signed | Hoby Milner | — | Philadelphia Phillies | Philadelphia Phillies signed LHP Hoby Milner. |
| Jun 7, 2012 | Signed | Steven Golden | — | Philadelphia Phillies | Philadelphia Phillies signed OF Steven Golden. |
| Jun 7, 2012 | Signed | Ricky Bielski | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Richard Bielski. |
| Jun 7, 2012 | Signed | Matt Sisto | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Matt Sisto. |
| Jun 7, 2012 | Signed | Jeb Stefan | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Jeb Stefan. |
| Jun 7, 2012 | Signed | Matt Strahm | — | Kansas City Royals | Kansas City Royals signed LHP Matthew Strahm. |
| Jun 7, 2012 | Signed | Andrew Triggs | — | Kansas City Royals | Kansas City Royals signed RHP Andrew Triggs. |
| Jun 7, 2012 | Signed | Daniel Stumpf | — | Kansas City Royals | Kansas City Royals signed LHP Daniel Stumpf. |
| Jun 7, 2012 | Signed | Alexis Rivera | — | Kansas City Royals | Kansas City Royals signed OF Alexis Rivera. |
| Jun 7, 2012 | Signed | Zeb Sneed | — | Kansas City Royals | Kansas City Royals signed RHP Zeb Sneed. |
| Jun 7, 2012 | Signed | Ariel Estades | — | Kansas City Royals | Kansas City Royals signed OF Ariel Estades. |
| Jun 7, 2012 | Signed | Shane Halley | — | Kansas City Royals | Kansas City Royals signed RHP Shane Halley. |
| Jun 7, 2012 | Signed | Beau Maggi | — | Kansas City Royals | Kansas City Royals signed C Beau Maggi. |
| Jun 7, 2012 | Signed | Mark Donato | — | Kansas City Royals | Kansas City Royals signed 1B Mark Donato. |
| Jun 7, 2012 | Signed | Sean Lucas | — | Cincinnati Reds | Cincinnati Reds signed LHP Sean Lucas. |
| Jun 7, 2012 | Signed | Jesse Winker | — | Cincinnati Reds | Cincinnati Reds signed OF Jesse Winker. |
| Jun 7, 2012 | Signed | Jeremy Lucas | — | Cleveland Guardians | Cleveland Indians signed C Jeremy Lucas. |
| Jun 7, 2012 | Signed | Ryan Newell | — | Miami Marlins | Miami Marlins signed RHP Ryan Newell. |
| Jun 7, 2012 | Signed | Drew Steckenrider | — | Miami Marlins | Miami Marlins signed RHP Drew Steckenrider. |
| Jun 7, 2012 | Signed | Patrick Claussen | — | Miami Marlins | Miami Marlins signed 3B Patrick Claussen. |
| Jun 7, 2012 | Signed | Kolby Copeland | — | Miami Marlins | Miami Marlins signed OF Kolby Copeland. |
| Jun 7, 2012 | Signed | Ron Miller | — | Miami Marlins | Miami Marlins signed 3B Ron Miller. |
| Jun 7, 2012 | Signed | Christian Barczykowski | — | Atlanta Braves | Atlanta Braves signed RHP Christian Barczykowski. |
| Jun 7, 2012 | Signed | Hayden Fox | — | Miami Marlins | Miami Marlins signed LHP Hayden Fox. |
| Jun 7, 2012 | Signed | Bryan Santy | — | Minnesota Twins | Minnesota Twins signed C Bryan Santy. |
| Jun 7, 2012 | Signed | Matt Snyder | — | New York Yankees | New York Yankees signed 1B Matt Snyder. |
| Jun 7, 2012 | Signed as free agent | Donny Medlinger | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Donny Medlinger to a minor league contract. |
| Jun 7, 2012 | Signed | Ross Stripling | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP Ross Stripling. |
| Jun 7, 2012 | Signed | John Cannon | — | Los Angeles Dodgers | Los Angeles Dodgers signed C John Cannon. |
| Jun 7, 2012 | Signed as free agent | Graham Hicks | — | Washington Nationals | Washington Nationals signed free agent LHP Graham Hicks to a minor league contract. |
| Jun 7, 2012 | Signed as free agent | Bolivar Perez | — | New York Yankees | New York Yankees signed free agent C Bolivar Perez to a minor league contract. |
| Jun 6, 2012 | Signed as free agent | David Kopp | — | Detroit Tigers | Detroit Tigers signed free agent RHP David Kopp to a minor league contract. |
| Jun 6, 2012 | Signed | Brady Rodgers | — | Houston Astros | Houston Astros signed RHP Brady Rodgers. |
| Jun 6, 2012 | Signed as free agent | Casey Frawley | — | Colorado Rockies | Colorado Rockies signed free agent SS Casey Frawley to a minor league contract. |
| Jun 6, 2012 | Signed as free agent | Russell Mitchell | — | San Francisco Giants | San Francisco Giants signed free agent 3B Russell Mitchell to a minor league contract. |
| Jun 6, 2012 | Signed as free agent | Ryan Feierabend | — | Cincinnati Reds | Cincinnati Reds signed free agent LHP Ryan Feierabend to a minor league contract. |
| Jun 6, 2012 | Signed | Jordan Guth | — | Philadelphia Phillies | Philadelphia Phillies signed RHP Jordan Guth. |
| Jun 6, 2012 | Signed | Parker Morin | — | Kansas City Royals | Kansas City Royals signed C Parker Morin. |
| Jun 6, 2012 | Signed | Ethan Chapman | — | Kansas City Royals | Kansas City Royals signed OF Ethan Chapman. |
| Jun 6, 2012 | Signed | Colin Rodgers | — | Kansas City Royals | Kansas City Royals signed LHP Colin Rodgers. |
| Jun 6, 2012 | Signed | Chad Johnson | — | Kansas City Royals | Kansas City Royals signed C Chad Johnson. |
| Jun 6, 2012 | Signed | Fred Ford | — | Kansas City Royals | Kansas City Royals signed OF Fred Ford. |
| Jun 6, 2012 | Signed | Alfredo Escalera | — | Kansas City Royals | Kansas City Royals signed OF Alfredo Escalera-Maldonado. |
| Jun 6, 2012 | Signed | Matt Tenuta | — | Kansas City Royals | Kansas City Royals signed LHP Matt Tenuta. |
| Jun 6, 2012 | Signed | Josh Martin | — | Cleveland Guardians | Cleveland Indians signed RHP Josh Martin. |
| Jun 6, 2012 | Signed | Joey Wendle | — | Cleveland Guardians | Cleveland Indians signed 2B Joe Wendle. |
| Jun 6, 2012 | Signed | Blake Logan | — | Miami Marlins | Miami Marlins signed RHP Blake Logan. |
| Jun 6, 2012 | Signed | Justin Black | — | Atlanta Braves | Atlanta Braves signed OF Justin Black. |
| Jun 6, 2012 | Signed | Christian Keene | — | Miami Marlins | Miami Marlins signed OF Christian Keene. |
| Jun 6, 2012 | Signed | Taylor Garrison | — | New York Yankees | New York Yankees signed RHP Taylor Garrison. |
| Jun 6, 2012 | Signed | Taylor Dugas | — | New York Yankees | New York Yankees signed OF Taylor Dugas. |
| Jun 6, 2012 | Signed as free agent | Gabriel Bermudez | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Gabriel Bermudez to a minor league contract. |
| Jun 6, 2012 | Signed as free agent | Gionny Fracchiolla | — | Texas Rangers | Texas Rangers signed free agent LHP Gionny Fracchiolla to a minor league contract. |
| Jun 5, 2012 | Signed as free agent | Wes Roemer | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Wes Roemer to a minor league contract. |
| Jun 5, 2012 | Signed | Chris Serritella | — | Philadelphia Phillies | Philadelphia Phillies signed 1B Chris Serritella. |
| Jun 5, 2012 | Signed | Dylan Sons | — | Kansas City Royals | Kansas City Royals signed LHP Dylan Sons. |
| Jun 5, 2012 | Signed as free agent | Andin Diaz | — | Chicago Cubs | Chicago Cubs signed free agent LHP Andin Diaz to a minor league contract. |
| Jun 5, 2012 | Signed as free agent | Jenner Emeterio | — | Chicago Cubs | Chicago Cubs signed free agent SS Jenner Emeterio to a minor league contract. |
| Jun 5, 2012 | Signed | Anthony Gomez | — | Miami Marlins | Miami Marlins signed 2B Anthony Gomez. |
| Jun 5, 2012 | Signed | Matt Juengel | — | Miami Marlins | Miami Marlins signed 3B Matt Juengel. |
| Jun 5, 2012 | Signed | Austin Dean | — | Miami Marlins | Miami Marlins signed OF Austin Dean. |
| Jun 5, 2012 | Signed as free agent | Francisco Carrillo | — | Chicago Cubs | Chicago Cubs signed free agent RHP Francisco Carrillo to a minor league contract. |
| Jun 5, 2012 | Signed as free agent | Carlos Polanco | — | Colorado Rockies | Colorado Rockies signed free agent RHP Carlos Polanco to a minor league contract. |
| Jun 4, 2012 | Trade | Ruben Gotay | Toronto Blue Jays | Atlanta Braves | Toronto Blue Jays traded 2B Ruben Gotay to Atlanta Braves. |
| Jun 4, 2012 | Signed as free agent | Ross Ohlendorf | — | San Diego Padres | San Diego Padres signed free agent Ross Ohlendorf. |
| Jun 4, 2012 | Signed | Junior Boni | — | Minnesota Twins | Minnesota Twins signed OF Junior Boni. |
| Jun 4, 2012 | Signed as free agent | Tim Sexton | — | Kansas City Royals | Kansas City Royals signed free agent RHP Tim Sexton to a minor league contract. |
| Jun 4, 2012 | Signed as free agent | Antonny Figueroa | — | San Francisco Giants | San Francisco Giants signed free agent RHP Antonny Figueroa to a minor league contract. |
| Jun 3, 2012 | Released | Starlyn Suriel | — | Washington Nationals | Washington Nationals released RHP Starlyn Suriel. |
| Jun 2, 2012 | Trade | Steve Pearce | New York Yankees | Baltimore Orioles | New York Yankees traded LF Steve Pearce to Baltimore Orioles. |
| Jun 2, 2012 | Signed as free agent | Evan Englebrook | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Evan Englebrook to a minor league contract. |
| Jun 2, 2012 | Signed as free agent | Tyler Hess | — | San Francisco Giants | San Francisco Giants signed free agent RHP Tyler Hess to a minor league contract. |
| Jun 2, 2012 | Signed as free agent | Pedro Nivar | — | Philadelphia Phillies | Philadelphia Phillies signed free agent SS Pedro Nivar to a minor league contract. |
| Jun 2, 2012 | Signed as free agent | Welington Serrano | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LHP Welington Serrano to a minor league contract. |
| Jun 2, 2012 | Signed as free agent | Ibrahin Redan | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Ibrahin Redan to a minor league contract. |
| Jun 2, 2012 | Signed as free agent | Julio Medrano | — | Colorado Rockies | Colorado Rockies signed free agent RHP Julio Medrano to a minor league contract. |
| Jun 2, 2012 | Signed | Enyel Vallejo | — | Pittsburgh Pirates | Pittsburgh Pirates signed SS Enyel Vallejo. |
| Jun 1, 2012 | Signed as free agent | Alfredo Belizaire | — | Chicago Cubs | Chicago Cubs signed free agent LHP Alfredo Belizaire to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Michael Main | — | Miami Marlins | Miami Marlins signed free agent OF Michael Main to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Ivan Castillo | — | Cleveland Guardians | Cleveland Indians signed free agent Ivan Castillo. |
| Jun 1, 2012 | Signed as free agent | Andri Santana | — | Cleveland Guardians | Cleveland Indians signed free agent Andri Santana. |
| Jun 1, 2012 | Released | Jamie Moyer | — | Colorado Rockies | Colorado Rockies released LHP Jamie Moyer. |
| Jun 1, 2012 | Signed as free agent | Oliver Asencio | — | Seattle Mariners | Seattle Mariners signed free agent LHP Oliver Asencio to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Luis Caballero | — | Seattle Mariners | Seattle Mariners signed free agent SS Luis Caballero to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Rodrigo Ayarza | — | Texas Rangers | Texas Rangers signed free agent IF Rodrigo Ayarza to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Oliver Caraballo | — | Texas Rangers | Texas Rangers signed free agent C Oliver Caraballo to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Felix Carvallo | — | Texas Rangers | Texas Rangers signed free agent LHP Felix Carvallo to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Jesus Guzman | — | Detroit Tigers | Detroit Tigers signed free agent LHP Jesus Guzman to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Rafael Cedeno | — | Texas Rangers | Texas Rangers signed free agent RHP Rafael Cedeno to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Albert Decena | — | Texas Rangers | Texas Rangers signed free agent RHP Albert Decena to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Carlos Garay | — | Texas Rangers | Texas Rangers signed free agent C Carlos Garay to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Yohander Méndez | — | Texas Rangers | Texas Rangers signed free agent LHP Yohander Mendez to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Pedro Payano | — | Texas Rangers | Texas Rangers signed free agent RHP Pedro Payano to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Eduard Pinto | — | Texas Rangers | Texas Rangers signed free agent OF Eduard Pinto to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Stanley Solano | — | Texas Rangers | Texas Rangers signed free agent RHP Stanley Solano to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Kevin Sosa | — | Texas Rangers | Texas Rangers signed free agent RHP Kevin Sosa to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Ricardo Valencia | — | Texas Rangers | Texas Rangers signed free agent C Ricardo Valencia to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Daris Vargas | — | Texas Rangers | Texas Rangers signed free agent RHP Daris Vargas to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Anyenil Mendoza | — | Texas Rangers | Texas Rangers signed free agent RHP Anyenil Mendoza to a minor league contract. |
| Jun 1, 2012 | Signed as free agent | Ricardo Andujar | — | Boston Red Sox | Boston Red Sox signed free agent SS Ricardo Andujar to a minor league contract. |
| Jun 1, 2012 | Signed | Eric Jaffe | — | Chicago White Sox | Chicago White Sox signed RHP Eric Jaffe. |
| May 31, 2012 | Signed as free agent | Angel Vargas | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Angel Vargas to a minor league contract. |
| May 31, 2012 | Released | Nate McLouth | — | Pittsburgh Pirates | Pittsburgh Pirates released LF Nate McLouth. |
| May 31, 2012 | Signed as free agent | Jean Lara | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Jean Lara to a minor league contract. |
| May 31, 2012 | Signed as free agent | Junior Arias | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Junior Arias to a minor league contract. |
| May 31, 2012 | Signed as free agent | Franklin Montilla | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Franklin Montilla to a minor league contract. |
| May 31, 2012 | Signed as free agent | Israel Cuevas | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Israel Cuevas to a minor league contract. |
| May 31, 2012 | Signed as free agent | Whaner Cuevas | — | Cincinnati Reds | Cincinnati Reds signed free agent SS Whaner Cuevas to a minor league contract. |
| May 31, 2012 | Signed as free agent | Alberti Chavez | — | Cincinnati Reds | Cincinnati Reds signed free agent SS Alberti Chavez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jose De Luna | — | Cincinnati Reds | Cincinnati Reds signed free agent OF Jose De Luna to a minor league contract. |
| May 31, 2012 | Signed as free agent | Pedro Brazoban | — | Chicago Cubs | Chicago Cubs signed free agent RHP Pedro Brazoban to a minor league contract. |
| May 31, 2012 | Signed as free agent | Frailyn Figueroa | — | Chicago Cubs | Chicago Cubs signed free agent LHP Frailin Figueroa to a minor league contract. |
| May 31, 2012 | Signed as free agent | Ricardo Marcano | — | Chicago Cubs | Chicago Cubs signed free agent OF Ricardo Marcano to a minor league contract. |
| May 31, 2012 | Signed as free agent | Luis Castillo | — | San Francisco Giants | San Francisco Giants signed free agent Luis Castillo. |
| May 31, 2012 | Signed as free agent | Keury Mella | — | San Francisco Giants | San Francisco Giants signed free agent RHP Keury Mella to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jose Morel | — | San Francisco Giants | San Francisco Giants signed free agent RHP Jose Morel to a minor league contract. |
| May 31, 2012 | Signed as free agent | Shan Gomez | — | San Francisco Giants | San Francisco Giants signed free agent C Shawn Gomez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Keiber Rivas | — | San Francisco Giants | San Francisco Giants signed free agent C Kleiber Rivas to a minor league contract. |
| May 31, 2012 | Signed as free agent | Miguel Gómez | — | San Francisco Giants | San Francisco Giants signed free agent C Miguel Gomez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Anthony Gomez | — | San Francisco Giants | San Francisco Giants signed free agent 3B Anthony Gomez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jean Alvarez | — | New York Mets | New York Mets signed free agent RHP Jean Alvarez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Yrelvis Castillo | — | New York Mets | New York Mets signed free agent RHP Yrelvis Castillo to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jorge Cespedes | — | New York Mets | New York Mets signed free agent RHP Jorge Cespedes to a minor league contract. |
| May 31, 2012 | Signed as free agent | Nabil Crismatt | — | New York Mets | New York Mets signed free agent RHP Nabil Crismatt to a minor league contract. |
| May 31, 2012 | Signed as free agent | Claudio Merilan | — | New York Mets | New York Mets signed free agent RHP Claudio Merilan to a minor league contract. |
| May 31, 2012 | Signed as free agent | Marcos Molina | — | New York Mets | New York Mets signed free agent RHP Marcos Molina to a minor league contract. |
| May 31, 2012 | Signed as free agent | Randi Montero | — | New York Mets | New York Mets signed free agent RHP Randi Montero to a minor league contract. |
| May 31, 2012 | Signed as free agent | Wildyn Florian | — | Boston Red Sox | Boston Red Sox signed free agent RHP Wildyn Florian to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jose Garcia | — | New York Mets | New York Mets signed free agent C Jose Garcia to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jose Martinez | — | New York Mets | New York Mets signed free agent SS Jose Martinez to a minor league contract. |
| May 31, 2012 | Signed as free agent | John Mora | — | New York Mets | New York Mets signed free agent OF John Mora to a minor league contract. |
| May 31, 2012 | Signed as free agent | Ysidro Pierre | — | New York Mets | New York Mets signed free agent OF Ysidro Pierre to a minor league contract. |
| May 31, 2012 | Signed as free agent | Hengelbert Rojas | — | New York Mets | New York Mets signed free agent OF Hengelbert Rojas to a minor league contract. |
| May 31, 2012 | Signed as free agent | Angelo Dilone | — | Washington Nationals | Washington Nationals signed free agent RHP Angelo Dilone to a minor league contract. |
| May 31, 2012 | Signed as free agent | Raymer Soto | — | Philadelphia Phillies | Philadelphia Phillies signed free agent C Raymer Soto to a minor league contract. |
| May 31, 2012 | Signed as free agent | Wilber Torres | — | Philadelphia Phillies | Philadelphia Phillies signed free agent C Wilber Torres to a minor league contract. |
| May 31, 2012 | Signed as free agent | Malquin Canelo | — | Philadelphia Phillies | Philadelphia Phillies signed free agent SS Malquin Canelo to a minor league contract. |
| May 31, 2012 | Signed as free agent | Olvy Marte | — | Philadelphia Phillies | Philadelphia Phillies signed free agent SS Olvy Marte to a minor league contract. |
| May 31, 2012 | Signed as free agent | Enmanuel Serra | — | Philadelphia Phillies | Philadelphia Phillies signed free agent SS Enmanuel Serra to a minor league contract. |
| May 31, 2012 | Signed as free agent | Hector Valdez | — | Philadelphia Phillies | Philadelphia Phillies signed free agent SS Hector Valdez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Samuel Hiciano | — | Philadelphia Phillies | Philadelphia Phillies signed free agent OF Samuel Hiciano to a minor league contract. |
| May 31, 2012 | Signed as free agent | Emmanuel Salas | — | Philadelphia Phillies | Philadelphia Phillies signed free agent OF Emmanuel Salas to a minor league contract. |
| May 31, 2012 | Signed as free agent | Seranthony Domínguez | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Seranthony Dominguez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Elniery García | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LHP Elniery Garcia to a minor league contract. |
| May 31, 2012 | Signed as free agent | Feliberto Sanchez | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Feliberto Sanchez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Masilis Valera | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Masilis Valera to a minor league contract. |
| May 31, 2012 | Signed as free agent | Reggie Cerda | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent C Reggie Cerda to a minor league contract. |
| May 31, 2012 | Signed as free agent | Misael Bueno | — | Kansas City Royals | Kansas City Royals signed free agent OF Misael Bueno to a minor league contract. |
| May 31, 2012 | Signed as free agent | Pablo Reyes | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 2B Pablo Reyes to a minor league contract. |
| May 31, 2012 | Signed as free agent | Wander Franco | — | Kansas City Royals | Kansas City Royals signed free agent IF Wander Franco to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jesus Ronco | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent SS Jesus Ronco to a minor league contract. |
| May 31, 2012 | Signed as free agent | Luis Lara | — | Kansas City Royals | Kansas City Royals signed free agent C Luis Lara to a minor league contract. |
| May 31, 2012 | Signed as free agent | Angelo Del Castillo | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent OF Angelo Del Castillo to a minor league contract. |
| May 31, 2012 | Signed as free agent | Luis Benitez | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent OF Luis Benitez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Edgar Figueroa | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent OF Eduardo Figueroa to a minor league contract. |
| May 31, 2012 | Signed as free agent | Julio Perez | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 1B Julio Perez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Francis Rodriguez | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Francis Rodriguez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Remy De Aza | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Remy De Aza to a minor league contract. |
| May 31, 2012 | Signed as free agent | Luilly Miranda | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent LHP Luylli Miranda to a minor league contract. |
| May 31, 2012 | Signed as free agent | Cristian Santiago | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Cristian Santiago to a minor league contract. |
| May 31, 2012 | Signed as free agent | Joaquin Acuna | — | New York Yankees | New York Yankees signed free agent RHP Joaquin Acuna to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jesus Aparicio | — | New York Yankees | New York Yankees signed free agent C Jesus Aparicio to a minor league contract. |
| May 31, 2012 | Signed as free agent | Allen Valerio | — | New York Yankees | New York Yankees signed free agent SS Allen Valerio to a minor league contract. |
| May 31, 2012 | Signed as free agent | Brayan Alcantara | — | New York Yankees | New York Yankees signed free agent RHP Brayan Alcantara to a minor league contract. |
| May 31, 2012 | Signed as free agent | Freddery Arias | — | New York Yankees | New York Yankees signed free agent RHP Freddery Arias to a minor league contract. |
| May 31, 2012 | Signed as free agent | Havid Burgos | — | New York Yankees | New York Yankees signed free agent LHP Havid Burgos to a minor league contract. |
| May 31, 2012 | Signed as free agent | Dallas Martinez | — | New York Yankees | New York Yankees signed free agent RHP Dallas Martinez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Rafael Ordaz | — | New York Yankees | New York Yankees signed free agent RHP Rafael Ordaz to a minor league contract. |
| May 31, 2012 | Signed as free agent | Luis Severino | — | New York Yankees | New York Yankees signed free agent RHP Luis Severino to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jhosue Bermudez | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LHP Jhosue Bermudez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Ivan Castillo | — | Cleveland Guardians | Cleveland Indians signed free agent IF Ivan Castillo to a minor league contract. |
| May 31, 2012 | Signed as free agent | Juan Carlos Moncion | — | Cleveland Guardians | Cleveland Indians signed free agent IF Juan Carlos Moncion to a minor league contract. |
| May 31, 2012 | Signed as free agent | Wilkin Acosta | — | Cleveland Guardians | Cleveland Indians signed free agent OF Wilkin Acosta to a minor league contract. |
| May 31, 2012 | Signed as free agent | Wascar Teodo | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Wascar Teodo to a minor league contract. |
| May 31, 2012 | Signed as free agent | Francisco Miguel | — | Cleveland Guardians | Cleveland Indians signed free agent Francisco Miguel. |
| May 31, 2012 | Signed as free agent | Jhoanel Jimenez | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent C Jhoanel Jimenez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Omar Sanchez | — | Cleveland Guardians | Cleveland Indians signed free agent OF Omar Sanchez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Andri Santana | — | Cleveland Guardians | Cleveland Indians signed free agent OF Andri Santana to a minor league contract. |
| May 31, 2012 | Signed as free agent | Luis Aquino | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Luis Aquino to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jesus Beras | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Jesus Beras to a minor league contract. |
| May 31, 2012 | Signed as free agent | Luis Gomez | — | Cleveland Guardians | Cleveland Indians signed free agent LHP Luis Gomez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Edgar Pineda | — | Cleveland Guardians | Cleveland Indians signed free agent LHP Edgar Pineda to a minor league contract. |
| May 31, 2012 | Signed as free agent | Johan Puello | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Johan Puello to a minor league contract. |
| May 31, 2012 | Signed as free agent | Anderson Placido | — | Cleveland Guardians | Cleveland Indians signed free agent Anderson Placido. |
| May 31, 2012 | Signed as free agent | Alejandro Rivas | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Alejandro Rivas to a minor league contract. |
| May 31, 2012 | Signed as free agent | Ramon Rodriguez | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Ramon Rodriguez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Junior Vincent | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Junior Vincent to a minor league contract. |
| May 31, 2012 | Signed as free agent | Anthony Vizcaya | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Anthony Vizcaya to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jarico Reynoso | — | Houston Astros | Houston Astros signed free agent OF Jarico Reynoso to a minor league contract. |
| May 31, 2012 | Signed as free agent | Randy César | — | Houston Astros | Houston Astros signed free agent 3B Randy Cesar to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jean Carlos Cortorreal | — | Houston Astros | Houston Astros signed free agent 2B Jean Carlos Cortorreal to a minor league contract. |
| May 31, 2012 | Signed as free agent | Arturo Michelena | — | Houston Astros | Houston Astros signed free agent SS Arturo Michelena to a minor league contract. |
| May 31, 2012 | Signed as free agent | Harold Arauz | — | Houston Astros | Houston Astros signed free agent Harold Arauz. |
| May 31, 2012 | Signed as free agent | Elieser Hernández | — | Houston Astros | Houston Astros signed free agent RHP Elieser Hernandez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Juan Hernandez | — | Houston Astros | Houston Astros signed free agent RHP Juan Hernandez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Edwin Villarroel | — | Houston Astros | Houston Astros signed free agent LHP Edwin Villarroel to a minor league contract. |
| May 31, 2012 | Signed as free agent | Sandber Pimentel | — | Athletics | Oakland Athletics signed free agent OF Sandber Pimentel to a minor league contract. |
| May 31, 2012 | Signed as free agent | Luis Hernandez | — | Athletics | Oakland Athletics signed free agent C Luis Hernandez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Santiago Chávez | — | Athletics | Oakland Athletics signed free agent C Jose Chavez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Reinaldo Hoyos | — | Athletics | Oakland Athletics signed free agent LHP Reynaldo Hoyos to a minor league contract. |
| May 31, 2012 | Signed as free agent | Alejandro Vargas | — | Athletics | Oakland Athletics signed free agent RHP Alejandro Vargas to a minor league contract. |
| May 31, 2012 | Signed as free agent | Yonalis Delgadillo | — | Athletics | Oakland Athletics signed free agent RHP Yonalis Delgadillo to a minor league contract. |
| May 31, 2012 | Signed as free agent | Ronald Herrera | — | Athletics | Oakland Athletics signed free agent RHP Ronald Herrera to a minor league contract. |
| May 31, 2012 | Signed as free agent | Rolman Ramirez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Rolman Ramirez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Elias Torres | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Elias Torres to a minor league contract. |
| May 31, 2012 | Signed as free agent | Joel Jumes | — | Tampa Bay Rays | Tampa Bay Rays signed free agent OF Joel Jumes to a minor league contract. |
| May 31, 2012 | Signed as free agent | Cristian Toribio | — | Tampa Bay Rays | Tampa Bay Rays signed free agent SS Cristian Toribio to a minor league contract. |
| May 31, 2012 | Signed as free agent | Bill Pujols | — | Tampa Bay Rays | Tampa Bay Rays signed free agent SS Bill Pujols to a minor league contract. |
| May 31, 2012 | Signed as free agent | Anthony Mojica | — | Tampa Bay Rays | Tampa Bay Rays signed free agent 2B Anthony Mojica to a minor league contract. |
| May 31, 2012 | Signed as free agent | Julio Herrera | — | Tampa Bay Rays | Tampa Bay Rays signed free agent C Julio Herrera to a minor league contract. |
| May 31, 2012 | Signed as free agent | Ruben Paredes | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Ruben Paredes to a minor league contract. |
| May 31, 2012 | Signed as free agent | Danilo Gutierrez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Danilo Gutierrez to a minor league contract. |
| May 31, 2012 | Signed as free agent | Ariel Gracia | — | Tampa Bay Rays | Tampa Bay Rays signed free agent LHP Ariel Gracia to a minor league contract. |
| May 31, 2012 | Signed as free agent | Oscar Collado | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Oscar Collado to a minor league contract. |
| May 31, 2012 | Signed as free agent | Rafael Cordova | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Rafael Cordova to a minor league contract. |
| May 31, 2012 | Signed as free agent | Erodis Castillo | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Erodis Castillo to a minor league contract. |
| May 31, 2012 | Signed as free agent | Julian Aybar | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Julian Aybar to a minor league contract. |
| May 31, 2012 | Signed as free agent | Raul Pedie | — | Seattle Mariners | Seattle Mariners signed free agent RHP Raul Pedie to a minor league contract. |
| May 31, 2012 | Signed as free agent | Luis Arteaga | — | Chicago White Sox | Chicago White Sox signed free agent RHP Luis Arteaga to a minor league contract. |
| May 31, 2012 | Signed as free agent | Huascar Brazobán | — | Colorado Rockies | Colorado Rockies signed free agent RHP Huascar Brazoban to a minor league contract. |
| May 31, 2012 | Signed as free agent | Luis Valenzuela | — | Boston Red Sox | Boston Red Sox signed free agent SS Luis Valenzuela to a minor league contract. |
| May 31, 2012 | Signed as free agent | Jose Rosa | — | Seattle Mariners | Seattle Mariners signed free agent C Jose Rosa to a minor league contract. |
| May 30, 2012 | Signed as free agent | Phillips Valdez | — | Washington Nationals | Washington Nationals signed free agent RHP Phillips Valdez to a minor league contract. |
| May 30, 2012 | Signed as free agent | Jose Guedez | — | Seattle Mariners | Seattle Mariners signed free agent OF Jose Guedez to a minor league contract. |
| May 30, 2012 | Signed as free agent | Victor Padron | — | Detroit Tigers | Detroit Tigers signed free agent OF Victor Padron to a minor league contract. |
| May 29, 2012 | Signed as free agent | Jason Marquis | — | San Diego Padres | San Diego Padres signed free agent RHP Jason Marquis to a minor league contract. |
| May 29, 2012 | Signed as free agent | Roy Oswalt | — | Texas Rangers | Texas Rangers signed free agent RHP Roy Oswalt to a minor league contract. |
| May 29, 2012 | Signed as free agent | Shane Lindsay | — | Chicago Cubs | Chicago Cubs signed free agent RHP Shane Lindsay to a minor league contract. |
| May 29, 2012 | Signed as free agent | Brian Bass | — | Houston Astros | Houston Astros signed free agent RHP Brian Bass to a minor league contract. |
| May 29, 2012 | Signed as free agent | Kenn Kasparek | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Kenn Kasparek to a minor league contract. |
| May 29, 2012 | Signed as free agent | Jorge Padilla | — | San Diego Padres | San Diego Padres signed free agent OF Jorge Padilla to a minor league contract. |
| May 29, 2012 | Signed as free agent | Daniel Sattler | — | Minnesota Twins | Minnesota Twins signed free agent RHP Daniel Sattler to a minor league contract. |
| May 29, 2012 | Signed as free agent | Doug Salinas | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Doug Salinas to a minor league contract. |
| May 29, 2012 | Signed as free agent | Dean Aldridge | — | Detroit Tigers | Detroit Tigers signed free agent RHP Dean Aldridge to a minor league contract. |
| May 28, 2012 | Signed as free agent | T.J. Steele | — | San Diego Padres | San Diego Padres signed free agent OF T.J. Steele to a minor league contract. |
| May 28, 2012 | Signed as free agent | Jimmy VanOstrand | — | Washington Nationals | Washington Nationals signed free agent 1B Jimmy Van Ostrand to a minor league contract. |
| May 28, 2012 | Signed as free agent | Thomas Alvarez | — | Washington Nationals | Washington Nationals signed free agent SS Thomas Alvarez to a minor league contract. |
| May 28, 2012 | Signed | Bobby O'Neill | — | Arizona Diamondbacks | Arizona Diamondbacks signed RHP Bobby O'Neill. |
| May 27, 2012 | Signed as free agent | Cyle Hankerd | — | Chicago White Sox | Chicago White Sox signed free agent OF Cyle Hankerd to a minor league contract. |
| May 27, 2012 | Signed as free agent | Bill Rice | — | Chicago White Sox | Chicago White Sox signed free agent OF Bill Rice to a minor league contract. |
| May 27, 2012 | Signed as free agent | Collin DeLome | — | Atlanta Braves | Atlanta Braves signed free agent OF Collin DeLome to a minor league contract. |
| May 26, 2012 | Released | Jason Marquis | — | Minnesota Twins | Minnesota Twins released RHP Jason Marquis. |
| May 26, 2012 | Signed as free agent | Luis Cedeno | — | New York Yankees | New York Yankees signed free agent RHP Luis Cedeno to a minor league contract. |
| May 26, 2012 | Signed as free agent | Kelvin Magallanes | — | New York Yankees | New York Yankees signed free agent RHP Kelvin Magallanes to a minor league contract. |
| May 26, 2012 | Signed as free agent | Kreisber Auciello | — | Tampa Bay Rays | Tampa Bay Rays signed free agent C Kreiber Auciello to a minor league contract. |
| May 25, 2012 | Released | D.J. Carrasco | — | New York Mets | New York Mets released RHP D.J. Carrasco. |
| May 25, 2012 | Signed as free agent | Jon Gaston | — | Chicago White Sox | Chicago White Sox signed free agent OF Jon Gaston to a minor league contract. |
| May 25, 2012 | Signed as free agent | Diory Hernandez | — | Chicago Cubs | Chicago Cubs signed free agent SS Diory Hernandez to a minor league contract. |
| May 25, 2012 | Signed as free agent | Niko Vasquez | — | Cincinnati Reds | Cincinnati Reds signed free agent 3B Niko Vasquez to a minor league contract. |
| May 25, 2012 | Signed as free agent | Luis Pino | — | San Francisco Giants | San Francisco Giants signed free agent RHP Luis Pino to a minor league contract. |
| May 25, 2012 | Signed as free agent | Angel Pena | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Angel Pena to a minor league contract. |
| May 24, 2012 | Signed as free agent | Nathan Kilcrease | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Nathan Kilcrease to a minor league contract. |
| May 24, 2012 | Signed | Hansel Mora | — | Chicago White Sox | Chicago White Sox signed RHP Hansel Mora. |
| May 24, 2012 | Signed | Yelmison Peralta | — | Chicago White Sox | Chicago White Sox signed RHP Yelmison Peralta. |
| May 24, 2012 | Signed as free agent | Oscar Melendez | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Oscar Melendez to a minor league contract. |
| May 24, 2012 | Signed as free agent | Offerman Collado | — | Kansas City Royals | Kansas City Royals signed free agent 2B Offerman Collado to a minor league contract. |
| May 23, 2012 | Signed as free agent | J.C. Romero | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP J.C. Romero to a minor league contract. |
| May 23, 2012 | Signed as free agent | Joey Gathright | — | Cincinnati Reds | Cincinnati Reds signed free agent CF Joey Gathright to a minor league contract. |
| May 23, 2012 | Signed as free agent | Brauly Mejia | — | Houston Astros | Houston Astros signed free agent OF Brauly Mejia to a minor league contract. |
| May 23, 2012 | Signed as free agent | Martin Rosario | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent C Martin Rosario to a minor league contract. |
| May 22, 2012 | Signed as free agent | Cory Aldridge | — | Los Angeles Angels | Los Angeles Angels signed free agent OF Cory Aldridge to a minor league contract. |
| May 22, 2012 | Signed as free agent | Orlando Hudson | — | Chicago White Sox | Chicago White Sox signed free agent 3B Orlando Hudson. |
| May 22, 2012 | Signed as free agent | Aaron Bates | — | St. Louis Cardinals | St. Louis Cardinals signed free agent 1B Aaron Bates to a minor league contract. |
| May 22, 2012 | Signed as free agent | Gaby Hernandez | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Gaby Hernandez to a minor league contract. |
| May 22, 2012 | Signed as free agent | Tillman Pugh | — | Chicago White Sox | Chicago White Sox signed free agent OF Tillman Pugh to a minor league contract. |
| May 22, 2012 | Signed as free agent | Christian Dun | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Christian Dun to a minor league contract. |
| May 21, 2012 | Trade | Drew Sutton | Atlanta Braves | Pittsburgh Pirates | Atlanta Braves traded 3B Drew Sutton to Pittsburgh Pirates for cash. |
| May 21, 2012 | Signed as free agent | Luis Montanez | — | St. Louis Cardinals | St. Louis Cardinals signed free agent LF Luis Montanez to a minor league contract. |
| May 21, 2012 | Signed as free agent | Ian Thomas | — | Atlanta Braves | Atlanta Braves signed free agent LHP Ian Thomas to a minor league contract. |
| May 21, 2012 | Trade | Drew Sutton | Pittsburgh Pirates | Tampa Bay Rays | Pittsburgh Pirates traded 3B Drew Sutton to Tampa Bay Rays for cash. |
| May 21, 2012 | Signed as free agent | Lance Zawadzki | — | Atlanta Braves | Atlanta Braves signed free agent 2B Lance Zawadzki to a minor league contract. |
| May 21, 2012 | Signed as free agent | Armando Galarraga | — | Houston Astros | Houston Astros signed free agent RHP Armando Galarraga to a minor league contract. |
| May 21, 2012 | Signed as free agent | Felix Paulino | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Felix Paulino to a minor league contract. |
| May 21, 2012 | Signed as free agent | Carlos Daniel Diaz | — | Chicago White Sox | Chicago White Sox signed free agent LHP Carlos Diaz to a minor league contract. |
| May 21, 2012 | Signed | Eric Beaulac | — | Baltimore Orioles | Baltimore Orioles signed RHP Eric Beaulac. |
| May 21, 2012 | Signed as free agent | Jesus Gonzalez | — | Texas Rangers | Texas Rangers signed free agent C Jesus Gonzalez to a minor league contract. |
| May 20, 2012 | Signed as free agent | Josh Barfield | — | Baltimore Orioles | Baltimore Orioles signed free agent 2B Josh Barfield to a minor league contract. |
| May 20, 2012 | Signed as free agent | Jose Paulino | — | Chicago Cubs | Chicago Cubs signed free agent LHP Jose Paulino to a minor league contract. |
| May 19, 2012 | Trade | Koyie Hill | Cincinnati Reds | Chicago Cubs | Cincinnati Reds traded C Koyie Hill to Chicago Cubs. |
| May 19, 2012 | Signed as free agent | Eammon Portice | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Eammon Portice to a minor league contract. |
| May 18, 2012 | Signed as free agent | Lew Ford | — | Baltimore Orioles | Baltimore Orioles signed free agent OF Lew Ford to a minor league contract. |
| May 18, 2012 | Signed as free agent | Gregorio Minier | — | Detroit Tigers | Detroit Tigers signed free agent RHP Gregorio Minier to a minor league contract. |
| May 18, 2012 | Signed as free agent | Luis Subero | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent C Luis Subero to a minor league contract. |
| May 18, 2012 | Signed as free agent | Leonardo Gonzalez | — | Chicago Cubs | Chicago Cubs signed free agent C Leonardo Gonzalez to a minor league contract. |
| May 18, 2012 | Signed as free agent | Brad Penny | — | San Francisco Giants | San Francisco Giants signed free agent RHP Brad Penny to a minor league contract. |
| May 17, 2012 | Signed as free agent | Sergio Miranda | — | Atlanta Braves | Atlanta Braves signed free agent 2B Sergio Miranda to a minor league contract. |
| May 17, 2012 | Released | Orlando Hudson | — | San Diego Padres | San Diego Padres released 2B Orlando Hudson. |
| May 17, 2012 | Signed as free agent | Manolo Reyes | — | New York Yankees | New York Yankees signed free agent RHP Manolo Reyes to a minor league contract. |
| May 17, 2012 | Signed as free agent | Juan Falcon | — | Detroit Tigers | Detroit Tigers signed free agent RHP Juan Falcon to a minor league contract. |
| May 17, 2012 | Signed | Junior Feliz | — | Tampa Bay Rays | Tampa Bay Rays signed RHP Junior Feliz. |
| May 16, 2012 | Signed as free agent | Ryan Garko | — | Tampa Bay Rays | Tampa Bay Rays signed free agent 1B Ryan Garko to a minor league contract. |
| May 16, 2012 | Trade | Rich Thompson | Philadelphia Phillies | Tampa Bay Rays | Philadelphia Phillies traded LF Rich Thompson to Tampa Bay Rays. |
| May 16, 2012 | Signed as free agent | Paolo Pezzarossi | — | Baltimore Orioles | Baltimore Orioles signed free agent OF Paolo Pezzarossi to a minor league contract. |
| May 15, 2012 | Signed as free agent | Clay Zavada | — | St. Louis Cardinals | St. Louis Cardinals signed free agent LHP Clay Zavada to a minor league contract. |
| May 15, 2012 | Signed as free agent | Matt Bischoff | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Matt Bischoff to a minor league contract. |
| May 14, 2012 | Released | J.C. Romero | — | St. Louis Cardinals | St. Louis Cardinals released LHP J.C. Romero. |
| May 14, 2012 | Signed as free agent | Brahiam Maldonado | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent OF Brahiam Maldonado to a minor league contract. |
| May 14, 2012 | Signed as free agent | Mike MacDougal | — | Chicago Cubs | Chicago Cubs signed free agent RHP Mike MacDougal to a minor league contract. |
| May 14, 2012 | Signed as free agent | Tyler Graham | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent LF Tyler Graham to a minor league contract. |
| May 14, 2012 | Signed as free agent | Claudio Vargas | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Claudio Vargas to a minor league contract. |
| May 14, 2012 | Signed as free agent | Felipe Talos | — | Seattle Mariners | Seattle Mariners signed free agent C Felipe Talos to a minor league contract. |
| May 13, 2012 | Signed as free agent | Joan De La Cruz | — | Milwaukee Brewers | Milwaukee Brewers signed free agent LHP Joan De La Cruz to a minor league contract. |
| May 12, 2012 | Trade | Jeff Larish | Boston Red Sox | Pittsburgh Pirates | Boston Red Sox traded 1B Jeff Larish to Pittsburgh Pirates. |
| May 12, 2012 | Trade | Scott Podsednik | Philadelphia Phillies | Boston Red Sox | Philadelphia Phillies traded CF Scott Podsednik to Boston Red Sox for cash. |
| May 12, 2012 | Trade | Mike Belfiore | Arizona Diamondbacks | Baltimore Orioles | Arizona Diamondbacks traded LHP Mike Belfiore to Baltimore Orioles. |
| May 12, 2012 | Signed as free agent | Doug Davis | — | Kansas City Royals | Kansas City Royals signed free agent LHP Doug Davis to a minor league contract. |
| May 12, 2012 | Signed as free agent | Jose Medina | — | Detroit Tigers | Detroit Tigers signed free agent RHP Jose Medina to a minor league contract. |
| May 12, 2012 | Signed as free agent | Julio Sanchez | — | Detroit Tigers | Detroit Tigers signed free agent RHP Julio Sanchez to a minor league contract. |
| May 12, 2012 | Signed as free agent | Edgar Pina | — | Detroit Tigers | Detroit Tigers signed free agent RHP Edgar Pina to a minor league contract. |
| May 12, 2012 | Signed as free agent | Brian Esposito | — | Chicago Cubs | Chicago Cubs signed free agent C Brian Esposito to a minor league contract. |
| May 11, 2012 | Signed as free agent | Aaron Miles | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent 3B Aaron Miles to a minor league contract. |
| May 11, 2012 | Released | Mike MacDougal | — | Los Angeles Dodgers | Los Angeles Dodgers released RHP Mike MacDougal. |
| May 11, 2012 | Signed as free agent | Felix Pie | — | Atlanta Braves | Atlanta Braves signed free agent LF Felix Pie to a minor league contract. |
| May 11, 2012 | Signed as free agent | Derwin Pomare | — | San Diego Padres | San Diego Padres signed free agent SS Derwin Pomare to a minor league contract. |
| May 10, 2012 | Signed as free agent | Vladimir Guerrero | — | Toronto Blue Jays | Toronto Blue Jays signed free agent DH Vladimir Guerrero to a minor league contract. |
| May 10, 2012 | Signed as free agent | Tommy Manzella | — | Milwaukee Brewers | Milwaukee Brewers signed free agent SS Tommy Manzella to a minor league contract. |
| May 10, 2012 | Signed as free agent | Jonathan Jimenez | — | Seattle Mariners | Seattle Mariners signed free agent RHP Jonathan Jimenez to a minor league contract. |
| May 10, 2012 | Signed as free agent | Jhombeyker Morales | — | Seattle Mariners | Seattle Mariners signed free agent IF Jhonbaker Morales to a minor league contract. |
| May 10, 2012 | Signed as free agent | Eudis Idrogo | — | Detroit Tigers | Detroit Tigers signed free agent LHP Eudis Idrogo to a minor league contract. |
| May 9, 2012 | Signed as free agent | Shawn Roof | — | Minnesota Twins | Minnesota Twins signed free agent 2B Shawn Roof to a minor league contract. |
| May 8, 2012 | Signed as free agent | Michael Gonzalez | — | Washington Nationals | Washington Nationals signed free agent LHP Michael Gonzalez to a minor league contract. |
| May 8, 2012 | Signed as free agent | Miguel Tejada | — | Baltimore Orioles | Baltimore Orioles signed free agent 3B Miguel Tejada to a minor league contract. |
| May 8, 2012 | Signed | Erick Hurtado | — | Houston Astros | Houston Astros signed LHP Erick Hurtado. |
| May 7, 2012 | Signed as free agent | Jose Hernandez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent IF Jose Hernandez to a minor league contract. |
| May 7, 2012 | Released | Tyler Graham | — | San Francisco Giants | San Francisco Giants released LF Tyler Graham. |
| May 7, 2012 | Signed as free agent | Kip Wells | — | San Diego Padres | San Diego Padres signed free agent RHP Kip Wells to a minor league contract. |
| May 7, 2012 | Signed as free agent | Anthony Reyes | — | San Diego Padres | San Diego Padres signed free agent RHP Anthony Reyes to a minor league contract. |
| May 7, 2012 | Signed as free agent | Roberto Ortiz | — | Baltimore Orioles | Baltimore Orioles signed free agent OF Roberto Ortiz to a minor league contract. |
| May 7, 2012 | Signed as free agent | Chase Weems | — | Baltimore Orioles | Baltimore Orioles signed free agent C Chase Weems to a minor league contract. |
| May 6, 2012 | Signed as free agent | Sean White | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Sean White to a minor league contract. |
| May 6, 2012 | Signed as free agent | Daniel Stange | — | San Diego Padres | San Diego Padres signed free agent RHP Daniel Stange to a minor league contract. |
| May 6, 2012 | Signed as free agent | Alden Carrithers | — | Atlanta Braves | Atlanta Braves signed free agent 2B Alden Carrithers to a minor league contract. |
| May 4, 2012 | Signed as free agent | Bobby Abreu | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RF Bobby Abreu. |
| May 4, 2012 | Trade | Ryan Spilborghs | Cleveland Guardians | Texas Rangers | Cleveland Indians traded RF Ryan Spilborghs to Texas Rangers for cash. |
| May 4, 2012 | Released | Zach Braddock | — | Milwaukee Brewers | Milwaukee Brewers released LHP Zach Braddock. |
| May 4, 2012 | Signed as free agent | Jesús Liranzo | — | Atlanta Braves | Atlanta Braves signed free agent RHP Jesus Liranzo to a minor league contract. |
| May 4, 2012 | Signed as free agent | Virgilio Encarnacion | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Virgilio Encarnacion to a minor league contract. |
| May 4, 2012 | Signed as free agent | Raul Garcia | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent SS Raul Garcia to a minor league contract. |
| May 4, 2012 | Signed as free agent | Rafael Gomez | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent SS Rafael Gomez to a minor league contract. |
| May 3, 2012 | Trade | Donn Roach | Los Angeles Angels | San Diego Padres | San Diego Padres traded RHP Ernesto Frieri to Los Angeles Angels for 2B Alexi Amarista and RHP Donn Roach. |
| May 3, 2012 | Signed as free agent | Steve Holm | — | Miami Marlins | Miami Marlins signed free agent C Steve Holm to a minor league contract. |
| May 2, 2012 | Signed as free agent | Michael Wuertz | — | Cincinnati Reds | Cincinnati Reds signed free agent Michael Wuertz. |
| May 2, 2012 | Signed as free agent | Jeff Frazier | — | Detroit Tigers | Detroit Tigers signed free agent LF Jeff Frazier to a minor league contract. |
| May 2, 2012 | Signed as free agent | Mark Prior | — | Boston Red Sox | Boston Red Sox signed free agent RHP Mark Prior to a minor league contract. |
| May 1, 2012 | Signed as free agent | Bear Bay | — | San Diego Padres | San Diego Padres signed free agent RHP Bear Bay to a minor league contract. |
| May 1, 2012 | Signed as free agent | Jordan Brown | — | Milwaukee Brewers | Milwaukee Brewers signed free agent LF Jordan Brown to a minor league contract. |
| May 1, 2012 | Signed as free agent | Albertin Chavez | — | Detroit Tigers | Detroit Tigers signed free agent 2B Albertin Chavez to a minor league contract. |
| May 1, 2012 | Signed as free agent | Luis Alcantara | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent C Luis Alcantara to a minor league contract. |
| May 1, 2012 | Signed as free agent | Wilmy Rodriguez | — | Chicago White Sox | Chicago White Sox signed free agent RHP Wilmy Rodriguez to a minor league contract. |
| May 1, 2012 | Signed as free agent | Roger Ramos | — | Chicago White Sox | Chicago White Sox signed free agent OF Roger Ramos to a minor league contract. |
| Apr 30, 2012 | Signed as free agent | Hideki Matsui | — | Tampa Bay Rays | Tampa Bay Rays signed free agent DH Hideki Matsui to a minor league contract. |
| Apr 30, 2012 | Signed as free agent | Brandon Inge | — | Athletics | Oakland Athletics signed free agent 3B Brandon Inge. |
| Apr 29, 2012 | Signed as free agent | Justin Miller | — | Texas Rangers | Texas Rangers signed free agent RHP Justin Miller to a minor league contract. |
| Apr 29, 2012 | Signed as free agent | Manuel Chavez | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LHP Manuel Chavez to a minor league contract. |
| Apr 29, 2012 | Signed as free agent | Erick Cedeno | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LHP Erick Cedeno to a minor league contract. |
| Apr 28, 2012 | Released | Bobby Abreu | — | Los Angeles Angels | Los Angeles Angels released RF Bobby Abreu. |
| Apr 28, 2012 | Signed as free agent | Ross Wolf | — | Texas Rangers | Texas Rangers signed free agent RHP Ross Wolf to a minor league contract. |
| Apr 28, 2012 | Signed as free agent | Adonis García | — | New York Yankees | New York Yankees signed free agent OF Adonis Garcia to a minor league contract. |
| Apr 27, 2012 | Signed as free agent | Tim Smith | — | Atlanta Braves | Atlanta Braves signed free agent OF Tim Smith to a minor league contract. |
| Apr 27, 2012 | Signed as free agent | Omarlin Franco | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Omarlin Franco to a minor league contract. |
| Apr 27, 2012 | Signed as free agent | Patrick Reardon | — | Tampa Bay Rays | Tampa Bay Rays signed free agent C Pat Reardon IV to a minor league contract. |
| Apr 26, 2012 | Released | Brandon Inge | — | Detroit Tigers | Detroit Tigers released 2B Brandon Inge. |
| Apr 25, 2012 | Signed as free agent | Bill Hall | — | Baltimore Orioles | Baltimore Orioles signed free agent 2B Bill Hall to a minor league contract. |
| Apr 25, 2012 | Signed as free agent | Joe Thurston | — | Minnesota Twins | Minnesota Twins signed free agent 2B Joe Thurston to a minor league contract. |
| Apr 24, 2012 | Signed as free agent | Jim Negrych | — | Washington Nationals | Washington Nationals signed free agent 2B Jim Negrych to a minor league contract. |
| Apr 24, 2012 | Signed as free agent | Dustin Martin | — | New York Mets | New York Mets signed free agent OF Dustin Martin to a minor league contract. |
| Apr 24, 2012 | Signed as free agent | Brad Emaus | — | New York Mets | New York Mets signed free agent 2B Brad Emaus to a minor league contract. |
| Apr 24, 2012 | Signed as free agent | Fred Lewis | — | New York Mets | New York Mets signed free agent LF Fred Lewis to a minor league contract. |
| Apr 24, 2012 | Signed as free agent | Kennil Gomez | — | Colorado Rockies | Colorado Rockies signed free agent RHP Kennil Gomez to a minor league contract. |
| Apr 24, 2012 | Signed as free agent | Manuel Gonzalez | — | San Diego Padres | San Diego Padres signed free agent RHP Manuel Gonzalez to a minor league contract. |
| Apr 24, 2012 | Signed as free agent | Kevin Dultz | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent C Kevin Dultz to a minor league contract. |
| Apr 24, 2012 | Signed as free agent | Efrain Nieves | — | Detroit Tigers | Detroit Tigers signed free agent LHP Efrain Nieves to a minor league contract. |
| Apr 23, 2012 | Released | Justin Miller | — | Texas Rangers | Texas Rangers released RHP Justin Miller. |
| Apr 23, 2012 | Signed as free agent | Jeff Larish | — | Boston Red Sox | Boston Red Sox signed free agent 1B Jeff Larish to a minor league contract. |
| Apr 22, 2012 | Signed as free agent | John Hester | — | Los Angeles Angels | Los Angeles Angels signed free agent John Hester. |
| Apr 22, 2012 | Signed as free agent | Jonathan Roof | — | San Diego Padres | San Diego Padres signed free agent SS Jonathan Roof. |
| Apr 21, 2012 | Signed as free agent | Carlos R Rojas | — | Baltimore Orioles | Baltimore Orioles signed free agent Carlos R Rojas. |
| Apr 21, 2012 | Trade | Josh Bell | Baltimore Orioles | Arizona Diamondbacks | Baltimore Orioles traded 3B Josh Bell to Arizona Diamondbacks for Player To Be Named Later. |
| Apr 21, 2012 | Trade | Marlon Byrd | Chicago Cubs | Boston Red Sox | Chicago Cubs traded CF Marlon Byrd to Boston Red Sox for RHP Michael Bowden. |
| Apr 21, 2012 | Signed as free agent | John Hester | — | Los Angeles Angels | Los Angeles Angels signed free agent John Hester. |
| Apr 20, 2012 | Signed as free agent | Mike Rivera | — | Boston Red Sox | Boston Red Sox signed free agent C Mike Rivera to a minor league contract. |
| Apr 20, 2012 | Signed as free agent | Chris Pettit | — | Seattle Mariners | Seattle Mariners signed free agent LF Chris Pettit to a minor league contract. |
| Apr 20, 2012 | Signed as free agent | Lance Pendleton | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Lance Pendleton to a minor league contract. |
| Apr 20, 2012 | Signed as free agent | Iago Januario | — | Tampa Bay Rays | Tampa Bay Rays signed free agent IF Iago Januario to a minor league contract. |
| Apr 20, 2012 | Signed as free agent | Philippe Valiquette | — | Milwaukee Brewers | Milwaukee Brewers signed free agent LHP Philippe Valiquette to a minor league contract. |
| Apr 20, 2012 | Signed as free agent | Damian Defrank | — | Minnesota Twins | Minnesota Twins signed free agent RHP Damian Defrank to a minor league contract. |
| Apr 20, 2012 | Signed as free agent | Alejandro Sanchez | — | San Diego Padres | San Diego Padres signed free agent RHP Alejandro Sanchez to a minor league contract. |
| Apr 20, 2012 | Signed as free agent | Daniel Lopez | — | Texas Rangers | Texas Rangers signed free agent RHP Daniel Lopez to a minor league contract. |
| Apr 20, 2012 | Signed as free agent | Eddie Bonine | — | San Diego Padres | San Diego Padres signed free agent Eddie Bonine. |
| Apr 19, 2012 | Trade | Zach Miner | Kansas City Royals | Detroit Tigers | Kansas City Royals traded RHP Zach Miner to Detroit Tigers. |
| Apr 19, 2012 | Signed as free agent | Richard Paulino | — | Atlanta Braves | Atlanta Braves signed free agent RHP Richard Paulino to a minor league contract. |
| Apr 19, 2012 | Signed as free agent | Jhan De Jesus | — | Chicago White Sox | Chicago White Sox signed free agent OF Jhan De Jesus to a minor league contract. |
| Apr 18, 2012 | Signed as free agent | Brent Clevlen | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent OF Brent Clevlen to a minor league contract. |
| Apr 18, 2012 | Signed as free agent | Russell Mitchell | — | Miami Marlins | Miami Marlins signed free agent 3B Russell Mitchell to a minor league contract. |
| Apr 18, 2012 | Signed as free agent | Clark Murphy | — | San Diego Padres | San Diego Padres signed free agent 1B Clark Murphy to a minor league contract. |
| Apr 18, 2012 | Signed as free agent | Jhonaiker Rodriguez | — | New York Mets | New York Mets signed free agent RHP Jhonaiker Rodriguez to a minor league contract. |
| Apr 17, 2012 | Signed as free agent | Johnny Damon | — | Cleveland Guardians | Cleveland Indians signed free agent LF Johnny Damon to a minor league contract. |
| Apr 17, 2012 | Signed as free agent | Nelson Figueroa | — | New York Yankees | New York Yankees signed free agent RHP Nelson Figueroa to a minor league contract. |
| Apr 17, 2012 | Signed as free agent | Brandon Hynick | — | Colorado Rockies | Colorado Rockies signed free agent RHP Brandon Hynick to a minor league contract. |
| Apr 17, 2012 | Signed as free agent | Nohisglym Rivero | — | Tampa Bay Rays | Tampa Bay Rays signed free agent C Nohisglin Rivero to a minor league contract. |
| Apr 17, 2012 | Signed as free agent | Victor Constanzo | — | Atlanta Braves | Atlanta Braves signed free agent RHP Victor Constanzo to a minor league contract. |
| Apr 17, 2012 | Signed as free agent | Harrinson Bermudez | — | Chicago Cubs | Chicago Cubs signed free agent RHP Harrinson Bermudez to a minor league contract. |
| Apr 16, 2012 | Signed as free agent | Hersin Martinez | — | Seattle Mariners | Seattle Mariners signed free agent OF Hersin Martinez to a minor league contract. |
| Apr 16, 2012 | Signed as free agent | Jesus Rodriguez | — | Miami Marlins | Miami Marlins signed free agent LHP Jesus Arias to a minor league contract. |
| Apr 16, 2012 | Signed as free agent | Angel De La Cruz | — | Miami Marlins | Miami Marlins signed free agent RHP Angel De La Cruz to a minor league contract. |
| Apr 16, 2012 | Signed as free agent | Jose Diaz | — | Miami Marlins | Miami Marlins signed free agent RHP Jose Diaz to a minor league contract. |
| Apr 14, 2012 | Signed as free agent | Randinson Suazo | — | New York Mets | New York Mets signed free agent RHP Randinson Suazo to a minor league contract. |
| Apr 14, 2012 | Signed as free agent | Bladimil Vallejo | — | New York Mets | New York Mets signed free agent RHP Bladimil Vallejo to a minor league contract. |
| Apr 14, 2012 | Signed as free agent | Joel Garcia | — | San Diego Padres | San Diego Padres signed free agent LHP Joel Garcia to a minor league contract. |
| Apr 14, 2012 | Signed as free agent | Jhonatan Pena | — | San Diego Padres | San Diego Padres signed free agent OF Jhonatan Pena to a minor league contract. |
| Apr 13, 2012 | Signed as free agent | Mike Fontenot | — | Philadelphia Phillies | Philadelphia Phillies signed free agent SS Mike Fontenot to a minor league contract. |
| Apr 13, 2012 | Signed as free agent | Johnnie Lowe | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Johnnie Lowe to a minor league contract. |
| Apr 12, 2012 | Signed as free agent | Mitch Canham | — | St. Louis Cardinals | St. Louis Cardinals signed free agent 1B Mitch Canham to a minor league contract. |
| Apr 12, 2012 | Signed as free agent | Joel Pineiro | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Joel Pineiro to a minor league contract. |
| Apr 12, 2012 | Signed as free agent | Nisandro Cleofa | — | Atlanta Braves | Atlanta Braves signed free agent OF Nisandro Cleofa to a minor league contract. |
| Apr 12, 2012 | Signed as free agent | Luis Ramirez | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Luis Ramirez to a minor league contract. |
| Apr 12, 2012 | Signed as free agent | Logan Wade | — | Minnesota Twins | Minnesota Twins signed free agent SS Logan Wade to a minor league contract. |
| Apr 11, 2012 | Signed as free agent | Mitch Stetter | — | Milwaukee Brewers | Milwaukee Brewers signed free agent LHP Mitch Stetter to a minor league contract. |
| Apr 11, 2012 | Signed | Eliezer Castillo | — | Detroit Tigers | Detroit Tigers signed SS Eliezer Castillo. |
| Apr 11, 2012 | Signed as free agent | Jose Brito | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Jose Brito to a minor league contract. |
| Apr 11, 2012 | Signed as free agent | Osvaldo Abreu | — | Washington Nationals | Washington Nationals signed free agent SS Osvaldo Abreu to a minor league contract. |
| Apr 10, 2012 | Trade | Jose Castro | Cincinnati Reds | Chicago White Sox | Cincinnati Reds traded 2B Jose Castro to Chicago White Sox for cash. |
| Apr 9, 2012 | Signed as free agent | Ramón Ortiz | — | New York Yankees | New York Yankees signed free agent RHP Ramon Ortiz to a minor league contract. |
| Apr 9, 2012 | Signed as free agent | Rick Van Den Hurk | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Rick van den Hurk to a minor league contract. |
| Apr 9, 2012 | Signed as free agent | Brent Greer | — | Washington Nationals | Washington Nationals signed free agent SS Brent Greer to a minor league contract. |
| Apr 9, 2012 | Signed | Yasiel Balaguert | — | Chicago Cubs | Chicago Cubs signed CF Yasiel Balaguert. |
| Apr 9, 2012 | Signed as free agent | Eufran Vargas | — | Chicago Cubs | Chicago Cubs signed free agent C Eufran Vargas to a minor league contract. |
| Apr 7, 2012 | Trade | Brian Tallet | Pittsburgh Pirates | San Diego Padres | Pittsburgh Pirates traded LHP Brian Tallet to San Diego Padres. |
| Apr 7, 2012 | Signed as free agent | Brian Anderson | — | Colorado Rockies | Colorado Rockies signed free agent Brian Anderson. |
| Apr 6, 2012 | Signed as free agent | Brad Hawpe | — | Texas Rangers | Texas Rangers signed free agent 1B Brad Hawpe to a minor league contract. |
| Apr 6, 2012 | Signed as free agent | Junior Amarante | — | Minnesota Twins | Minnesota Twins signed free agent OF Junior Amarante to a minor league contract. |
| Apr 6, 2012 | Signed as free agent | Adrian Bravo-Carmona | — | Tampa Bay Rays | Tampa Bay Rays signed free agent C Adrian Bravo-Carmona to a minor league contract. |
| Apr 4, 2012 | Signed as free agent | Aaron Heilman | — | Texas Rangers | Texas Rangers signed free agent RHP Aaron Heilman to a minor league contract. |
| Apr 4, 2012 | Released | Felix Pie | — | Cleveland Guardians | Cleveland Indians released LF Felix Pie. |
| Apr 4, 2012 | Trade | Chris Stewart | San Francisco Giants | New York Yankees | New York Yankees traded RHP George Kontos to San Francisco Giants for C Chris Stewart. |
| Apr 4, 2012 | Released | Bill Hall | — | New York Yankees | New York Yankees released 2B Bill Hall. |
| Apr 4, 2012 | Signed as free agent | Matt Bashore | — | New York Yankees | New York Yankees signed free agent LHP Matt Bashore to a minor league contract. |
| Apr 4, 2012 | Signed as free agent | Michael Dubee | — | New York Yankees | New York Yankees signed free agent RHP Michael Dubee to a minor league contract. |
| Apr 4, 2012 | Signed as free agent | Ryan Kiel | — | Cincinnati Reds | Cincinnati Reds signed free agent LHP Ryan Kiel to a minor league contract. |
| Apr 4, 2012 | Released | Brian Esposito | — | Cincinnati Reds | Cincinnati Reds released C Brian Esposito. |
| Apr 4, 2012 | Released | Collin DeLome | — | Houston Astros | Houston Astros released OF Collin DeLome. |
| Apr 3, 2012 | Signed as free agent | Chad Durbin | — | Atlanta Braves | Atlanta Braves signed free agent RHP Chad Durbin. |
| Apr 3, 2012 | Trade | Christian Marrero | Chicago White Sox | Atlanta Braves | Chicago White Sox traded 1B Christian Marrero to Atlanta Braves. |
| Apr 3, 2012 | Signed as free agent | Chris Robinson | — | Baltimore Orioles | Baltimore Orioles signed free agent C Chris Robinson to a minor league contract. |
| Apr 3, 2012 | Signed as free agent | Garis Pena | — | Chicago White Sox | Chicago White Sox signed free agent 2B Garis Pena to a minor league contract. |
| Apr 3, 2012 | Released | Nathan Maldonado | — | Chicago Cubs | Chicago Cubs released C Nathan Maldonado. |
| Apr 2, 2012 | Released | Chad Durbin | — | Washington Nationals | Washington Nationals released RHP Chad Durbin. |
| Apr 1, 2012 | Trade | Juan Francisco | Cincinnati Reds | Atlanta Braves | Cincinnati Reds traded 3B Juan Francisco to Atlanta Braves for RHP J.J. Hoover. |
| Apr 1, 2012 | Signed as free agent | Jason Bulger | — | New York Yankees | New York Yankees signed free agent Jason Bulger. |
| Apr 1, 2012 | Signed as free agent | Bobby Scales | — | New York Mets | New York Mets signed free agent 2B Bobby Scales to a minor league contract. |
| Apr 1, 2012 | Signed as free agent | Renny Osuna | — | Los Angeles Angels | Los Angeles Angels signed free agent IF Renny Osuna to a minor league contract. |
| Apr 1, 2012 | Released | Jorge Vazquez | — | New York Yankees | New York Yankees released 1B Jorge Vazquez. |
| Apr 1, 2012 | Signed as free agent | Matt Rizzotti | — | Minnesota Twins | Minnesota Twins signed free agent 1B Matt Rizzotti to a minor league contract. |
| Apr 1, 2012 | Released | Aaron Heilman | — | Seattle Mariners | Seattle Mariners released RHP Aaron Heilman. |
| Apr 1, 2012 | Signed as free agent | Jack Cust | — | New York Yankees | New York Yankees signed free agent RF Jack Cust to a minor league contract. |
| Apr 1, 2012 | Released | Chris Pettit | — | Los Angeles Dodgers | Los Angeles Dodgers released LF Chris Pettit. |
| Apr 1, 2012 | Signed as free agent | Ranger Suarez | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LHP Ranger Suarez to a minor league contract. |
| Apr 1, 2012 | Released | Ryde Rodriguez | — | Minnesota Twins | Minnesota Twins released RF Ryde Rodriguez. |
| Mar 31, 2012 | Signed as free agent | Conor Jackson | — | Chicago White Sox | Chicago White Sox signed free agent LF Conor Jackson to a minor league contract. |
| Mar 31, 2012 | Signed as free agent | Andrés Blanco | — | Philadelphia Phillies | Philadelphia Phillies signed free agent SS Andres Blanco to a minor league contract. |
| Mar 31, 2012 | Signed as free agent | Joe Thurston | — | Philadelphia Phillies | Philadelphia Phillies signed free agent 2B Joe Thurston to a minor league contract. |
| Mar 31, 2012 | Trade | Robby Rowland | Arizona Diamondbacks | Pittsburgh Pirates | Arizona Diamondbacks traded RHP Robby Rowland to Pittsburgh Pirates. |
| Mar 31, 2012 | Trade | Kyle Hudson | Texas Rangers | Tampa Bay Rays | Texas Rangers traded LF Kyle Hudson to Tampa Bay Rays for cash. |
| Mar 31, 2012 | Released | Bobby Scales | — | Chicago Cubs | Chicago Cubs released 2B Bobby Scales. |
| Mar 31, 2012 | Signed as free agent | Édgar González | — | Colorado Rockies | Colorado Rockies signed free agent RHP Edgar Gonzalez to a minor league contract. |
| Mar 31, 2012 | Released | Nelson Figueroa | — | Toronto Blue Jays | Toronto Blue Jays released RHP Nelson Figueroa. |
| Mar 31, 2012 | Signed as free agent | Emmanuel Quiles | — | Milwaukee Brewers | Milwaukee Brewers signed free agent C Emmanuel Quiles to a minor league contract. |
| Mar 30, 2012 | Released | Livan Hernandez | — | Houston Astros | Houston Astros released Livan Hernandez. |
| Mar 30, 2012 | Signed as free agent | Livan Hernandez | — | Atlanta Braves | Atlanta Braves signed free agent RHP Livan Hernandez. |
| Mar 30, 2012 | Released | Mike Rivera | — | Milwaukee Brewers | Milwaukee Brewers released C Mike Rivera. |
| Mar 30, 2012 | Released | Matt Chico | — | Los Angeles Dodgers | Los Angeles Dodgers released LHP Matt Chico. |
| Mar 30, 2012 | Released | Mike Fontenot | — | San Francisco Giants | San Francisco Giants released SS Mike Fontenot. |
| Mar 30, 2012 | Trade | Ryota Igarashi | Pittsburgh Pirates | Toronto Blue Jays | Pittsburgh Pirates traded RHP Ryota Igarashi to Toronto Blue Jays for cash. |
| Mar 30, 2012 | Released | Lance Pendleton | — | Houston Astros | Houston Astros released RHP Lance Pendleton. |
| Mar 30, 2012 | Signed as free agent | Jake Shaffer | — | St. Louis Cardinals | St. Louis Cardinals signed free agent LF Jake Shaffer to a minor league contract. |
| Mar 30, 2012 | Signed as free agent | Lee Hyde | — | New York Yankees | New York Yankees signed free agent LHP Lee Hyde to a minor league contract. |
| Mar 30, 2012 | Released | Chris Robinson | — | Texas Rangers | Texas Rangers released C Chris Robinson. |
| Mar 30, 2012 | Released | Édgar González | — | Athletics | Oakland Athletics released RHP Edgar Gonzalez. |
| Mar 30, 2012 | Released | Clay Zavada | — | Cincinnati Reds | Cincinnati Reds released LHP Clay Zavada. |
| Mar 30, 2012 | Released | Brent Clevlen | — | Philadelphia Phillies | Philadelphia Phillies released OF Brent Clevlen. |
| Mar 30, 2012 | Signed | Cesar Carrasco | — | Arizona Diamondbacks | Arizona Diamondbacks signed Cesar Carrasco. |
| Mar 30, 2012 | Released | Kevin Moscatel | — | Milwaukee Brewers | Milwaukee Brewers released C Kevin Moscatel. |
| Mar 29, 2012 | Trade | Jairo Asencio | Atlanta Braves | Cleveland Guardians | Atlanta Braves traded RHP Jairo Asencio to Cleveland Indians for cash. |
| Mar 29, 2012 | Released | Aaron Rowand | — | Miami Marlins | Miami Marlins released CF Aaron Rowand. |
| Mar 29, 2012 | Released | Jason Michaels | — | Washington Nationals | Washington Nationals released Jason Michaels. |
| Mar 29, 2012 | Signed as free agent | Joshua Rodriguez | — | New York Mets | New York Mets signed free agent 2B Josh Rodriguez to a minor league contract. |
| Mar 29, 2012 | Signed as free agent | Zach Duke | — | Washington Nationals | Washington Nationals signed free agent LHP Zach Duke to a minor league contract. |
| Mar 29, 2012 | Signed as free agent | Jason Jaramillo | — | Milwaukee Brewers | Milwaukee Brewers signed free agent C Jason Jaramillo to a minor league contract. |
| Mar 29, 2012 | Released | Josh Bard | — | Los Angeles Dodgers | Los Angeles Dodgers released C Josh Bard. |
| Mar 29, 2012 | Released | Cory Sullivan | — | Los Angeles Dodgers | Los Angeles Dodgers released LF Cory Sullivan. |
| Mar 29, 2012 | Released | Brad Hawpe | — | Texas Rangers | Texas Rangers released 1B Brad Hawpe. |
| Mar 29, 2012 | Released | Dennis Tankersley | — | San Diego Padres | San Diego Padres released RHP Dennis Tankersley. |
| Mar 29, 2012 | Released | Philippe Valiquette | — | Seattle Mariners | Seattle Mariners released LHP Philippe Valiquette. |
| Mar 29, 2012 | Released | Justin Cassel | — | Chicago White Sox | Chicago White Sox released RHP Justin Cassel. |
| Mar 29, 2012 | Released | Kyle Colligan | — | Chicago White Sox | Chicago White Sox released OF Kyle Colligan. |
| Mar 29, 2012 | Released | Renny Osuna | — | Texas Rangers | Texas Rangers released IF Renny Osuna. |
| Mar 29, 2012 | Released | Tyson Corley | — | Chicago White Sox | Chicago White Sox released RHP Tyson Corley. |
| Mar 29, 2012 | Released | Jared Bolden | — | Texas Rangers | Texas Rangers released 3B Jared Bolden. |
| Mar 29, 2012 | Released | Russell Mitchell | — | Los Angeles Dodgers | Los Angeles Dodgers released 3B Russell Mitchell. |
| Mar 29, 2012 | Released | Tim Smith | — | Kansas City Royals | Kansas City Royals released OF Tim Smith. |
| Mar 29, 2012 | Released | Andrés Blanco | — | Washington Nationals | Washington Nationals released SS Andres Blanco. |
| Mar 29, 2012 | Released | Doug Salinas | — | Texas Rangers | Texas Rangers released RHP Doug Salinas. |
| Mar 29, 2012 | Released | Luis Chirinos | — | Washington Nationals | Washington Nationals released RHP Luis Chirinos. |
| Mar 28, 2012 | Released | Joe Thurston | — | Houston Astros | Houston Astros released 2B Joe Thurston. |
| Mar 28, 2012 | Signed as free agent | Xavier Nady | — | Washington Nationals | Washington Nationals signed free agent 1B Xavier Nady to a minor league contract and invited him to spring training. |
| Mar 28, 2012 | Signed as free agent | Kevin Pucetas | — | Washington Nationals | Washington Nationals signed free agent RHP Kevin Pucetas to a minor league contract. |
| Mar 28, 2012 | Released | Cristian Guzman | — | Cleveland Guardians | Cleveland Indians released 2B Cristian Guzman. |
| Mar 28, 2012 | Signed as free agent | David Pauley | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP David Pauley to a minor league contract. |
| Mar 28, 2012 | Signed as free agent | Steve Pearce | — | New York Yankees | New York Yankees signed free agent 1B Steve Pearce to a minor league contract. |
| Mar 28, 2012 | Released | Chin-Lung Hu | — | Cleveland Guardians | Cleveland Indians released SS Chin-lung Hu. |
| Mar 28, 2012 | Signed | Sean O'Connell | — | Los Angeles Dodgers | Los Angeles Dodgers signed RHP Sean O'Connell. |
| Mar 27, 2012 | Released | Steve Pearce | — | Minnesota Twins | Minnesota Twins released 1B Steve Pearce. |
| Mar 27, 2012 | Released | Jack Cust | — | Houston Astros | Houston Astros released RF Jack Cust. |
| Mar 27, 2012 | Released | Zach Duke | — | Houston Astros | Houston Astros released LHP Zach Duke. |
| Mar 27, 2012 | Released | Jason Bulger | — | Minnesota Twins | Minnesota Twins released RHP Jason Bulger. |
| Mar 27, 2012 | Released | Casey Blake | — | Colorado Rockies | Colorado Rockies released 3B Casey Blake. |
| Mar 27, 2012 | Signed as free agent | Anthony Contreras | — | San Diego Padres | San Diego Padres signed free agent IF Anthony Contreras to a minor league contract. |
| Mar 27, 2012 | Released | Joel Zumaya | — | Minnesota Twins | Minnesota Twins released RHP Joel Zumaya. |
| Mar 27, 2012 | Released | Jason Jaramillo | — | Chicago Cubs | Chicago Cubs released C Jason Jaramillo. |
| Mar 27, 2012 | Released | Steven Kent | — | Kansas City Royals | Kansas City Royals released LHP Steven Kent. |
| Mar 27, 2012 | Signed as free agent | Gabriel Moya | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent LHP Gabriel Moya to a minor league contract. |
| Mar 27, 2012 | Signed as free agent | Luis Gonzalez | — | Minnesota Twins | Minnesota Twins signed free agent C Luis Gonzalez to a minor league contract. |
| Mar 27, 2012 | Released | Thomas Di Benedetto | — | Baltimore Orioles | Baltimore Orioles released 3B Thomas Di Benedetto. |
| Mar 26, 2012 | Signed as free agent | Shawn Camp | — | Chicago Cubs | Chicago Cubs signed free agent RHP Shawn Camp to a minor league contract and invited him to spring training. |
| Mar 26, 2012 | Released | Ramón Ortiz | — | San Francisco Giants | San Francisco Giants released RHP Ramon Ortiz. |
| Mar 26, 2012 | Released | Trever Miller | — | Chicago Cubs | Chicago Cubs released LHP Trever Miller. |
| Mar 26, 2012 | Released | Mitch Stetter | — | Texas Rangers | Texas Rangers released LHP Mitch Stetter. |
| Mar 26, 2012 | Released | Joe Beimel | — | Texas Rangers | Texas Rangers released LHP Joe Beimel. |
| Mar 26, 2012 | Released | Conor Jackson | — | Texas Rangers | Texas Rangers released LF Conor Jackson. |
| Mar 26, 2012 | Released | John Grabow | — | Los Angeles Dodgers | Los Angeles Dodgers released LHP John Grabow. |
| Mar 26, 2012 | Released | Delwyn Young | — | Chicago White Sox | Chicago White Sox released RF Delwyn Young. |
| Mar 26, 2012 | Signed as free agent | Jorlin Chales | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent SS Jorlin Chales to a minor league contract. |
| Mar 25, 2012 | Released | Alex Cora | — | St. Louis Cardinals | St. Louis Cardinals released 2B Alex Cora. |
| Mar 25, 2012 | Released | Koyie Hill | — | St. Louis Cardinals | St. Louis Cardinals released C Koyie Hill. |
| Mar 25, 2012 | Trade | Greg Golson | Kansas City Royals | Chicago White Sox | Kansas City Royals traded CF Greg Golson to Chicago White Sox. |
| Mar 25, 2012 | Released | Mike MacDonald | — | Arizona Diamondbacks | Arizona Diamondbacks released RHP Mike MacDonald. |
| Mar 25, 2012 | Signed as free agent | Chris Young | — | New York Mets | New York Mets signed free agent RHP Chris Young to a minor league contract. |
| Mar 23, 2012 | Released | Sean White | — | Boston Red Sox | Boston Red Sox released RHP Sean White. |
| Mar 22, 2012 | Signed as free agent | Hector Martinez | — | New York Yankees | New York Yankees signed free agent OF Hector Martinez to a minor league contract. |
| Mar 21, 2012 | Signed as free agent | Dontrelle Willis | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Dontrelle Willis to a minor league contract and invited him to spring training. |
| Mar 21, 2012 | Released | Shawn Camp | — | Seattle Mariners | Seattle Mariners released RHP Shawn Camp. |
| Mar 21, 2012 | Signed as free agent | Francisco Leandro | — | Toronto Blue Jays | Toronto Blue Jays signed free agent OF Francisco Leandro to a minor league contract. |
| Mar 21, 2012 | Signed as free agent | Carlos Diaz | — | New York Yankees | New York Yankees signed free agent LHP Carlos Diaz to a minor league contract. |
| Mar 21, 2012 | Signed as free agent | Bradley Valdez | — | Chicago White Sox | Chicago White Sox signed free agent 3B Bradley Valdez to a minor league contract. |
| Mar 20, 2012 | Trade | Jason Bourgeois | Houston Astros | Kansas City Royals | Houston Astros traded CF Jason Bourgeois and C Humberto Quintero to Kansas City Royals for LHP Kevin Chapman. |
| Mar 20, 2012 | Signed as free agent | D.J. Jarrad | — | Chicago White Sox | Chicago White Sox signed free agent SS D.J. Jarrad to a minor league contract. |
| Mar 19, 2012 | Released | Hung-Chih Kuo | — | Seattle Mariners | Seattle Mariners released LHP Hung-Chih Kuo. |
| Mar 19, 2012 | Released | Ryne Reynoso | — | Cincinnati Reds | Cincinnati Reds released RHP Ryne Reynoso. |
| Mar 19, 2012 | Released | Joel Pineiro | — | Philadelphia Phillies | Philadelphia Phillies released RHP Joel Pineiro. |
| Mar 19, 2012 | Signed as free agent | Joxelier Garcia | — | Chicago White Sox | Chicago White Sox signed free agent C Joxelier Garcia to a minor league contract. |
| Mar 18, 2012 | Released | Alberto Castillo | — | Los Angeles Dodgers | Los Angeles Dodgers released LHP Alberto Castillo. |
| Mar 18, 2012 | Signed as free agent | Oswaldo Navarro | — | New York Mets | New York Mets signed free agent SS Oswaldo Navarro to a minor league contract. |
| Mar 18, 2012 | Released | Ryan Feierabend | — | Philadelphia Phillies | Philadelphia Phillies released LHP Ryan Feierabend. |
| Mar 17, 2012 | Released | Carlos Silva | — | Boston Red Sox | Boston Red Sox released RHP Carlos Silva. |
| Mar 17, 2012 | Signed as free agent | Kyle Smit | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Kyle Smit to a minor league contract. |
| Mar 16, 2012 | Released | Dontrelle Willis | — | Philadelphia Phillies | Philadelphia Phillies released LHP Dontrelle Willis. |
| Mar 16, 2012 | Signed as free agent | Andy Pettitte | — | New York Yankees | New York Yankees signed free agent LHP Andy Pettitte to a minor league contract and invited him to spring training. |
| Mar 16, 2012 | Signed as free agent | Omar Basulto | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent LHP Omar Basulto to a minor league contract. |
| Mar 16, 2012 | Signed as free agent | Jovany Lopez | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent LHP Jovany Lopez to a minor league contract. |
| Mar 16, 2012 | Signed as free agent | Marcus Beltrez | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent LHP Marcus Beltrez to a minor league contract. |
| Mar 16, 2012 | Signed as free agent | Eduardo Vera | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Eduardo Vera to a minor league contract. |
| Mar 16, 2012 | Signed as free agent | Richard Mitchell | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Richard Mitchell to a minor league contract. |
| Mar 15, 2012 | Trade | Kelvin De La Cruz | Texas Rangers | Cleveland Guardians | Texas Rangers traded LHP Kelvin De La Cruz to Cleveland Indians. |
| Mar 15, 2012 | Signed as free agent | Josh Barfield | — | Baltimore Orioles | Baltimore Orioles signed free agent 2B Josh Barfield to a minor league contract. |
| Mar 15, 2012 | Signed as free agent | Steven De La Mota | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 1B Steven De La Mota to a minor league contract. |
| Mar 15, 2012 | Signed as free agent | Tito Polo | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent OF Tito Polo to a minor league contract. |
| Mar 15, 2012 | Signed as free agent | Leandro Rodriguez | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Leandro Rodriguez to a minor league contract. |
| Mar 15, 2012 | Signed as free agent | Miguel Rosario | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Miguel Rosario to a minor league contract. |
| Mar 14, 2012 | Signed as free agent | Landon Powell | — | Houston Astros | Houston Astros signed free agent C Landon Powell to a minor league contract and invited him to spring training. |
| Mar 14, 2012 | Signed as free agent | Wladimir Marruffo | — | Seattle Mariners | Seattle Mariners signed free agent RHP Wladimir Marruffo to a minor league contract. |
| Mar 13, 2012 | Signed as free agent | Danilo Sojo | — | Seattle Mariners | Seattle Mariners signed free agent 1B Danilo Sojo to a minor league contract. |
| Mar 13, 2012 | Signed as free agent | José Alvarado | — | Tampa Bay Rays | Tampa Bay Rays signed free agent LHP Jose Alvarado to a minor league contract. |
| Mar 13, 2012 | Signed as free agent | Armando Bastardo | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Armando Bastardo to a minor league contract. |
| Mar 13, 2012 | Signed as free agent | Brian Pena | — | Houston Astros | Houston Astros signed free agent C Brian Pena to a minor league contract. |
| Mar 12, 2012 | Released | David Pauley | — | Detroit Tigers | Detroit Tigers released RHP David Pauley. |
| Mar 12, 2012 | Signed as free agent | Miguel Mejia | — | Miami Marlins | Miami Marlins signed free agent RHP Miguel Mejia to a minor league contract. |
| Mar 12, 2012 | Signed as free agent | Craig Fritsch | — | New York Mets | New York Mets signed free agent RHP Craig Fritsch to a minor league contract. |
| Mar 12, 2012 | Signed as free agent | Angel Almao | — | Los Angeles Angels | Los Angeles Angels signed free agent SS Angel Almao to a minor league contract. |
| Mar 12, 2012 | Signed as free agent | Juan Moreno | — | Los Angeles Angels | Los Angeles Angels signed free agent SS Juan Moreno to a minor league contract. |
| Mar 12, 2012 | Signed as free agent | Eduardo Paredes | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Eduardo Paredes to a minor league contract. |
| Mar 12, 2012 | Signed as free agent | Junior Pimentel | — | Los Angeles Angels | Los Angeles Angels signed free agent LHP Junior Pimentel to a minor league contract. |
| Mar 12, 2012 | Signed as free agent | Ramon Rodriguez | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Ramon Rodriguez to a minor league contract. |
| Mar 12, 2012 | Signed as free agent | Alexander Valdez | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Alexander Valdez to a minor league contract. |
| Mar 12, 2012 | Signed as free agent | Edward Santana | — | Houston Astros | Houston Astros signed free agent OF Edward Santana to a minor league contract. |
| Mar 12, 2012 | Signed as free agent | Eugenio Diaz | — | Atlanta Braves | Atlanta Braves signed free agent 1B Eugenio Diaz to a minor league contract. |
| Mar 11, 2012 | Signed as free agent | Gerardo Concepción | — | Chicago Cubs | Chicago Cubs signed free agent Gerardo Concepcion. |
| Mar 11, 2012 | Signed as free agent | Miles Walding | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent OF Miles Walding to a minor league contract. |
| Mar 11, 2012 | Signed as free agent | Victor Rey | — | New York Yankees | New York Yankees signed free agent 3B Victor Rey to a minor league contract. |
| Mar 11, 2012 | Signed as free agent | Barfil Munoz | — | New York Yankees | New York Yankees signed free agent OF Barfil Munoz to a minor league contract. |
| Mar 11, 2012 | Signed as free agent | Abraham Pierret | — | New York Yankees | New York Yankees signed free agent OF Abraham Pierret to a minor league contract. |
| Mar 11, 2012 | Signed as free agent | Wascar Rodriguez | — | New York Yankees | New York Yankees signed free agent OF Wascar Rodriguez to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | Tom Boleska | — | Miami Marlins | Miami Marlins signed free agent Tom Boleska. |
| Mar 10, 2012 | Signed as free agent | Carlos Duran | — | Philadelphia Phillies | Philadelphia Phillies signed free agent OF Carlos Duran to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | Raudy Guzman | — | New York Yankees | New York Yankees signed free agent RHP Raudy Guzman to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | Hershelon Juliana | — | New York Yankees | New York Yankees signed free agent RHP Hershelon Juliana to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | Jose Pichardo | — | New York Yankees | New York Yankees signed free agent RHP Jose Pichardo to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | Aderlis Reyes | — | New York Yankees | New York Yankees signed free agent RHP Aderlis Reyes to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | David Rodriguez | — | New York Yankees | New York Yankees signed free agent RHP David Rodriguez to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | Yohanny Castillo | — | New York Yankees | New York Yankees signed free agent C Yohanny Castillo to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | Ozzie Liranzo | — | New York Yankees | New York Yankees signed free agent C Ozzie Liranzo to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | Alvaro Noriega | — | New York Yankees | New York Yankees signed free agent C Alvaro Noriega to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | Angel Aguilar | — | New York Yankees | New York Yankees signed free agent SS Angel Aguilar to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | Daniel Barrios | — | New York Yankees | New York Yankees signed free agent SS Daniel Barrios to a minor league contract. |
| Mar 10, 2012 | Signed as free agent | Bryan Cuevas | — | New York Yankees | New York Yankees signed free agent SS Bryan Cuevas to a minor league contract. |
| Mar 9, 2012 | Released | Landon Powell | — | Athletics | Oakland Athletics released C Landon Powell. |
| Mar 9, 2012 | Signed | Matt Lipka | — | Atlanta Braves | Atlanta Braves signed SS Matt Lipka. |
| Mar 9, 2012 | Signed as free agent | Billy Killian | — | Minnesota Twins | Minnesota Twins signed free agent C Billy Killian to a minor league contract. |
| Mar 9, 2012 | Signed as free agent | Norberto Susini | — | Minnesota Twins | Minnesota Twins signed free agent C Norberto Susini to a minor league contract. |
| Mar 9, 2012 | Signed as free agent | Kevin Mulvey | — | New York Mets | New York Mets signed free agent RHP Kevin Mulvey to a minor league contract. |
| Mar 9, 2012 | Signed as free agent | Roger Velez | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent LHP Roger Velez to a minor league contract. |
| Mar 9, 2012 | Signed as free agent | Nelson Sandoval | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Nelson Sandoval to a minor league contract. |
| Mar 9, 2012 | Signed as free agent | Cristian Manzueta | — | Cleveland Guardians | Cleveland Indians signed free agent LHP Cristian Manzueta to a minor league contract. |
| Mar 8, 2012 | Signed as free agent | John Mincone | — | New York Mets | New York Mets signed free agent LHP John Mincone to a minor league contract. |
| Mar 8, 2012 | Signed as free agent | Chris Pack | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Chris Pack to a minor league contract. |
| Mar 8, 2012 | Signed as free agent | Bo Schultz | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Bo Schultz to a minor league contract. |
| Mar 8, 2012 | Signed as free agent | Jason Patton | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent OF Jason Patton to a minor league contract. |
| Mar 8, 2012 | Signed as free agent | Rainel Diaz | — | Cleveland Guardians | Cleveland Indians signed free agent C Rainel Diaz to a minor league contract. |
| Mar 7, 2012 | Signed as free agent | Jarrad Page | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent OF Jarrad Page to a minor league contract. |
| Mar 7, 2012 | Signed as free agent | Yohan Pino | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Yohan Pino to a minor league contract. |
| Mar 7, 2012 | Signed as free agent | Anderson Placido | — | Cleveland Guardians | Cleveland Indians signed free agent LHP Anderson Placido to a minor league contract. |
| Mar 7, 2012 | Signed as free agent | Johan Puello | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Johan Puello to a minor league contract. |
| Mar 6, 2012 | Released | Carlos Guillén | — | Seattle Mariners | Seattle Mariners released 2B Carlos Guillen. |
| Mar 6, 2012 | Signed as free agent | Terry Evans | — | Kansas City Royals | Kansas City Royals signed free agent OF Terry Evans to a minor league contract. |
| Mar 6, 2012 | Signed as free agent | Ryan Meade | — | Kansas City Royals | Kansas City Royals signed free agent 1B Ryan Meade to a minor league contract. |
| Mar 5, 2012 | Signed as free agent | Neal Cotts | — | Texas Rangers | Texas Rangers signed free agent LHP Neal Cotts to a minor league contract and invited him to spring training. |
| Mar 5, 2012 | Signed as free agent | Cody Evans | — | Texas Rangers | Texas Rangers signed free agent RHP Cody Evans to a minor league contract. |
| Mar 5, 2012 | Signed as free agent | Benji Johnson | — | Los Angeles Angels | Los Angeles Angels signed free agent C Benji Johnson to a minor league contract. |
| Mar 5, 2012 | Signed as free agent | Jose Ariza | — | Chicago White Sox | Chicago White Sox signed free agent C Jose Ariza to a minor league contract. |
| Mar 5, 2012 | Signed as free agent | Victor Diaz | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Victor Diaz to a minor league contract. |
| Mar 5, 2012 | Signed as free agent | Junior Flores | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Junior Flores to a minor league contract. |
| Mar 5, 2012 | Signed as free agent | Kevin Martinez | — | Milwaukee Brewers | Milwaukee Brewers signed free agent C Kevin Martinez to a minor league contract. |
| Mar 5, 2012 | Signed as free agent | Jesus Arias | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Jesus Arias to a minor league contract. |
| Mar 5, 2012 | Signed as free agent | Anthony Vizcaya | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Anthony Vizcaya to a minor league contract. |
| Mar 4, 2012 | Released | Dennys Reyes | — | Baltimore Orioles | Baltimore Orioles released LHP Dennys Reyes. |
| Mar 4, 2012 | Signed as free agent | Fernando Hernandez | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Fernando Hernandez to a minor league contract. |
| Mar 4, 2012 | Signed as free agent | Nathan Maldonado | — | Chicago Cubs | Chicago Cubs signed free agent C Nathan Maldonado to a minor league contract. |
| Mar 3, 2012 | Signed as free agent | Yoenis Cespedes | — | Athletics | Oakland Athletics signed free agent CF Yoenis Cespedes. |
| Mar 3, 2012 | Signed as free agent | Jon Meloan | — | Texas Rangers | Texas Rangers signed free agent RHP Jon Meloan to a minor league contract. |
| Mar 3, 2012 | Signed as free agent | Dennis Tankersley | — | San Diego Padres | San Diego Padres signed free agent RHP Dennis Tankersley to a minor league contract. |
| Mar 3, 2012 | Signed as free agent | Eber Guzman | — | San Francisco Giants | San Francisco Giants signed free agent RHP Eber Guzman to a minor league contract. |
| Mar 3, 2012 | Signed as free agent | Marco Guzman | — | San Francisco Giants | San Francisco Giants signed free agent 2B Marco Guzman to a minor league contract. |
| Mar 3, 2012 | Signed as free agent | Luis Ramos | — | Boston Red Sox | Boston Red Sox signed free agent LHP Luis Ramos to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Blake Johnson | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Blake Johnson to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Jeff Howell | — | Washington Nationals | Washington Nationals signed free agent C Jeff Howell to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Jonathan Bautista | — | Chicago Cubs | Chicago Cubs signed free agent RHP Jonathan Bautista to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Bryant Flete | — | Chicago Cubs | Chicago Cubs signed free agent SS Bryant Flete to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Jeffry Hernandez | — | Chicago Cubs | Chicago Cubs signed free agent RHP Jeffry Hernandez to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Hendry Mercado | — | Chicago Cubs | Chicago Cubs signed free agent RHP Hendry Mercado to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Dalfis Ortiz | — | Chicago Cubs | Chicago Cubs signed free agent SS Dalfis Ortiz to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Jose Paniagua | — | Chicago Cubs | Chicago Cubs signed free agent OF Jose Paniagua to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Jesus Pereyra | — | Chicago Cubs | Chicago Cubs signed free agent RHP Jesus Pereyra to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Carlos Ramirez | — | Chicago Cubs | Chicago Cubs signed free agent C Carlos Ramirez to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Miguel Rico | — | Chicago Cubs | Chicago Cubs signed free agent 3B Miguel Rico to a minor league contract. |
| Mar 2, 2012 | Signed as free agent | Shamil Ubiera | — | Chicago Cubs | Chicago Cubs signed free agent OF Shamil Ubiera to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Randy Ruiz | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent 1B Randy Ruiz to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Brandon Mims | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent 2B Brandon Mims to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Jonathan Torres | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Jonathan Torres to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Luis Espinoza | — | Los Angeles Angels | Los Angeles Angels signed free agent OF Luis Espinoza to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Juan Fresa | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Juan Fresa to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Jose Lara | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Jose Lara to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Frederis Parra | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Frederis Parra to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Greyfer Eregua | — | Chicago Cubs | Chicago Cubs signed free agent RHP Greyfer Eregua to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Carlos Llano | — | Chicago Cubs | Chicago Cubs signed free agent RHP Carlos Llano to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Pablo Urena | — | Boston Red Sox | Boston Red Sox signed free agent C Pablo Urena to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Kevin Segovia | — | Boston Red Sox | Boston Red Sox signed free agent C Kevin Segovia to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Osvaldo Almengo | — | Boston Red Sox | Boston Red Sox signed free agent SS Osvaldo Almengo to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Manuel Margot | — | Boston Red Sox | Boston Red Sox signed free agent OF Manuel Margot to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Luis Carreno | — | New York Mets | New York Mets signed free agent RHP Luis Carreno to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Yoan Gonzalez | — | New York Mets | New York Mets signed free agent LHP Yoan Gonzalez to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Juan Marte | — | New York Mets | New York Mets signed free agent RHP Juan Marte to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Aneury Olivo | — | New York Mets | New York Mets signed free agent LHP Aneury Olivo to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Ramon Rodriguez | — | New York Mets | New York Mets signed free agent RHP Ramon Rodriguez to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Jose Maria | — | New York Mets | New York Mets signed free agent C Jose Maria to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Dionis Rodriguez | — | New York Mets | New York Mets signed free agent C Dionis Rodriguez to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Jhoan Urena | — | New York Mets | New York Mets signed free agent 3B Jhoan Urena to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Leurys De La Rosa | — | Miami Marlins | Miami Marlins signed free agent RHP Leurys De La Rosa to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Cesar Brito | — | Miami Marlins | Miami Marlins signed free agent LHP Cesar Brito to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Juan Arias | — | Miami Marlins | Miami Marlins signed free agent RHP Juan Arias to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Derlin Romero | — | Miami Marlins | Miami Marlins signed free agent RHP Derlin Romero to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Alsy Leon | — | Miami Marlins | Miami Marlins signed free agent C Alsy Leon to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Angel Reyes | — | Miami Marlins | Miami Marlins signed free agent C Angel Reyes to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Geral Silva | — | Miami Marlins | Miami Marlins signed free agent SS Geral Silva to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Javier Lopez | — | Miami Marlins | Miami Marlins signed free agent SS Javier Lopez to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Rafael Salgado | — | Miami Marlins | Miami Marlins signed free agent SS Rafael Salgado to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Pedro Made | — | Miami Marlins | Miami Marlins signed free agent SS Pedro Made to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Alinson Peguero | — | Miami Marlins | Miami Marlins signed free agent OF Alinson Peguero to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Roger Avello | — | Miami Marlins | Miami Marlins signed free agent OF Roger Avello to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Gustavo Barrios | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent SS Gustavo Barrios to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Dennis Hurtarte | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 1B Dennis Hurtarte to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Fredys Padilla | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent 2B Fredis Padilla to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Carlos Ozuna | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent SS Carlos Ozuna to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Henrry Rosario | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent OF Henrry Rosario to a minor league contract. |
| Mar 1, 2012 | Signed as free agent | Carlos Rodriguez | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Carlos Rodriguez to a minor league contract. |
| Feb 29, 2012 | Signed as free agent | Garrett Mock | — | Boston Red Sox | Boston Red Sox signed free agent RHP Garrett Mock to a minor league contract. |
| Feb 29, 2012 | Signed as free agent | Alex Smith | — | New York Yankees | New York Yankees signed free agent RHP Alex Smith to a minor league contract. |
| Feb 29, 2012 | Signed as free agent | Josh Banks | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Josh Banks to a minor league contract. |
| Feb 29, 2012 | Signed as free agent | Billy Buckner | — | Boston Red Sox | Boston Red Sox signed free agent RHP Billy Buckner to a minor league contract. |
| Feb 29, 2012 | Signed as free agent | Rigoberto Arrebato | — | New York Yankees | New York Yankees signed free agent LHP Rigoberto Arrebato to a minor league contract. |
| Feb 29, 2012 | Signed as free agent | Eduar Lopez | — | Los Angeles Angels | Los Angeles Angels signed free agent Eduar Lopez. |
| Feb 29, 2012 | Signed as free agent | Edisson Rosario | — | Los Angeles Angels | Los Angeles Angels signed free agent LHP Edisson Rosario to a minor league contract. |
| Feb 29, 2012 | Signed as free agent | Andres De Aza | — | Toronto Blue Jays | Toronto Blue Jays signed free agent OF Andres De Aza to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Miguel González | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Miguel Gonzalez to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Juan Fuente | — | Cleveland Guardians | Cleveland Indians signed free agent OF Juan Fuente to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Fernando Jose | — | New York Yankees | New York Yankees signed free agent RHP Fernando Jose to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Merki Martinez | — | New York Yankees | New York Yankees signed free agent RHP Merki Martinez to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Olvis Jimenez | — | Cincinnati Reds | Cincinnati Reds signed free agent OF Olvis Jimenez to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Raynay Guerrero | — | Cincinnati Reds | Cincinnati Reds signed free agent OF Raynar Guerrero to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Carlos Garcia | — | Boston Red Sox | Boston Red Sox signed free agent LHP Carlos Garcia to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | William Gonzalez | — | Boston Red Sox | Boston Red Sox signed free agent RHP William Gonzalez to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Keivin Heras | — | Boston Red Sox | Boston Red Sox signed free agent RHP Keivin Heras to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Luis Ortega | — | Boston Red Sox | Boston Red Sox signed free agent LHP Luis Ortega to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Enfember Martinez | — | Boston Red Sox | Boston Red Sox signed free agent RHP Enfember Martinez to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Edinxon Pacheco | — | Boston Red Sox | Boston Red Sox signed free agent RHP Edinxon Pacheco to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Randy Perez | — | Boston Red Sox | Boston Red Sox signed free agent LHP Randy Perez to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Yankory Pimentel | — | Boston Red Sox | Boston Red Sox signed free agent RHP Yankory Pimentel to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Victor Ramirez | — | Boston Red Sox | Boston Red Sox signed free agent RHP Victor Ramirez to a minor league contract. |
| Feb 28, 2012 | Signed as free agent | Dioscar Romero | — | Boston Red Sox | Boston Red Sox signed free agent RHP Dioscar Romero to a minor league contract. |
| Feb 27, 2012 | Signed as free agent | Marcus Lemon | — | Detroit Tigers | Detroit Tigers signed free agent LF Marcus Lemon to a minor league contract. |
| Feb 27, 2012 | Signed as free agent | Bobby Wilkins | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Bobby Wilkins to a minor league contract. |
| Feb 27, 2012 | Signed as free agent | Miguel Perez | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent C Miguel Perez to a minor league contract. |
| Feb 27, 2012 | Signed as free agent | Reinaldo Robles | — | Detroit Tigers | Detroit Tigers signed free agent RHP Reinaldo Robles to a minor league contract. |
| Feb 27, 2012 | Signed as free agent | Adenson Verastegui | — | Detroit Tigers | Detroit Tigers signed free agent RHP Adenson Verastegui to a minor league contract. |
| Feb 27, 2012 | Signed as free agent | Yensys Capellan | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent 3B Yensys Capellan to a minor league contract. |
| Feb 27, 2012 | Signed as free agent | Luis Jimenez | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Luis Jimenez to a minor league contract. |
| Feb 27, 2012 | Signed as free agent | Carlos Diaz | — | Cleveland Guardians | Cleveland Indians signed free agent LHP Carlos Diaz to a minor league contract. |
| Feb 26, 2012 | Signed as free agent | Juan Rincon | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Juan Rincon to a minor league contract. |
| Feb 25, 2012 | Signed as free agent | Chris Valencia | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent OF Chris Valencia to a minor league contract. |
| Feb 25, 2012 | Signed as free agent | Jay Gibbons | — | Milwaukee Brewers | Milwaukee Brewers signed free agent LF Jay Gibbons to a minor league contract. |
| Feb 25, 2012 | Signed as free agent | Ryde Rodriguez | — | Minnesota Twins | Minnesota Twins signed free agent RF Ryde Rodriguez to a minor league contract. |
| Feb 25, 2012 | Signed as free agent | Ryan Quigley | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Ryan Quigley to a minor league contract. |
| Feb 25, 2012 | Signed as free agent | Adam Lewis | — | St. Louis Cardinals | St. Louis Cardinals signed free agent C Adam Lewis to a minor league contract. |
| Feb 25, 2012 | Signed as free agent | Rodolfo Fernandez | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Rodolfo Fernandez to a minor league contract. |
| Feb 24, 2012 | Signed as free agent | Alexander Labrador | — | Baltimore Orioles | Baltimore Orioles signed free agent C Alexander Labrador to a minor league contract. |
| Feb 24, 2012 | Signed as free agent | Sergio Lamas | — | Baltimore Orioles | Baltimore Orioles signed free agent SS Sergio Lamas to a minor league contract. |
| Feb 24, 2012 | Signed as free agent | Neomar Magallanes | — | Baltimore Orioles | Baltimore Orioles signed free agent C Neomar Magallanes to a minor league contract. |
| Feb 24, 2012 | Signed as free agent | Yanuel Cuevas | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Yanuel Cuevas to a minor league contract. |
| Feb 23, 2012 | Signed as free agent | Daniel Cabrera | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Daniel Cabrera to a minor league contract and invited him to spring training. |
| Feb 23, 2012 | Signed as free agent | Yi-Hsiang Lin | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Yi-Hsiang Lin to a minor league contract. |
| Feb 23, 2012 | Signed as free agent | Bobby Dombrowski | — | Baltimore Orioles | Baltimore Orioles signed free agent C Bobby Dombrowski to a minor league contract. |
| Feb 23, 2012 | Signed as free agent | Josh Johnson | — | Baltimore Orioles | Baltimore Orioles signed free agent C Josh Johnson to a minor league contract. |
| Feb 23, 2012 | Signed as free agent | Drew Beuerlein | — | Colorado Rockies | Colorado Rockies signed free agent C Drew Beuerlein to a minor league contract. |
| Feb 23, 2012 | Released | Jose Ascanio | — | Los Angeles Dodgers | Los Angeles Dodgers released RHP Jose Ascanio. |
| Feb 23, 2012 | Signed as free agent | Ezequiel Guzman | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent C Ezequiel Guzman to a minor league contract. |
| Feb 22, 2012 | Signed as free agent | Rick Van Den Hurk | — | Toronto Blue Jays | Toronto Blue Jays signed free agent Rick van den Hurk. |
| Feb 22, 2012 | Signed as free agent | Cristian Guzman | — | Cleveland Guardians | Cleveland Indians signed free agent 2B Cristian Guzman to a minor league contract and invited him to spring training. |
| Feb 22, 2012 | Signed as free agent | David Aardsma | — | New York Yankees | New York Yankees signed free agent RHP David Aardsma. |
| Feb 22, 2012 | Signed as free agent | Jason Isringhausen | — | Los Angeles Angels | Los Angeles Angels signed free agent RHP Jason Isringhausen to a minor league contract and invited him to spring training. |
| Feb 22, 2012 | Signed as free agent | Josh Worrell | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Josh Worrell to a minor league contract. |
| Feb 22, 2012 | Signed as free agent | Royce Ring | — | Colorado Rockies | Colorado Rockies signed free agent LHP Royce Ring to a minor league contract. |
| Feb 22, 2012 | Signed as free agent | Alex Roy | — | Seattle Mariners | Seattle Mariners signed free agent LHP Alex Roy to a minor league contract. |
| Feb 21, 2012 | Trade | Chris Carpenter | Chicago Cubs | Boston Red Sox | Chicago Cubs traded RHP Chris Carpenter to Boston Red Sox. |
| Feb 21, 2012 | Signed as free agent | Raul Ibanez | — | New York Yankees | New York Yankees signed free agent LF Raul Ibanez. |
| Feb 21, 2012 | Trade | Kelvin De La Cruz | Cleveland Guardians | Texas Rangers | Cleveland Indians traded LHP Kelvin De La Cruz to Texas Rangers. |
| Feb 21, 2012 | Signed as free agent | Brian Anderson | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent Brian Anderson. |
| Feb 21, 2012 | Signed as free agent | Rick Bauer | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Rick Bauer to a minor league contract. |
| Feb 21, 2012 | Signed as free agent | Mike Schultz | — | Washington Nationals | Washington Nationals signed free agent RHP Mike Schultz to a minor league contract. |
| Feb 21, 2012 | Signed as free agent | Michael Depen | — | Cleveland Guardians | Cleveland Indians signed free agent OF Michael Depen to a minor league contract. |
| Feb 20, 2012 | Signed as free agent | Clay Rapada | — | New York Yankees | New York Yankees signed free agent LHP Clay Rapada to a minor league contract and invited him to spring training. |
| Feb 20, 2012 | Signed as free agent | Manny Ramirez | — | Athletics | Oakland Athletics signed free agent LF Manny Ramirez to a minor league contract and invited him to spring training. |
| Feb 19, 2012 | Signed as free agent | Brett Tomko | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Brett Tomko to a minor league contract and invited him to spring training. |
| Feb 19, 2012 | Trade | A.J. Burnett | New York Yankees | Pittsburgh Pirates | New York Yankees traded RHP A.J. Burnett to Pittsburgh Pirates for RHP Diego Moreno and OF Exicardo Cayones. |
| Feb 19, 2012 | Signed as free agent | Brent Leach | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LHP Brent Leach to a minor league contract. |
| Feb 18, 2012 | Signed as free agent | Aaron Guiel | — | Kansas City Royals | Kansas City Royals signed free agent Aaron Guiel. |
| Feb 18, 2012 | Signed as free agent | Nate Robertson | — | Chicago Cubs | Chicago Cubs signed free agent LHP Nate Robertson to a minor league contract. |
| Feb 17, 2012 | Signed as free agent | Chris Gimenez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent C Chris Gimenez to a minor league contract and invited him to spring training. |
| Feb 17, 2012 | Released | Garrett Mock | — | Toronto Blue Jays | Toronto Blue Jays released RHP Garrett Mock. |
| Feb 17, 2012 | Signed as free agent | Archie Gilbert | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent CF Archie Gilbert to a minor league contract. |
| Feb 17, 2012 | Signed as free agent | Lance Durham | — | Detroit Tigers | Detroit Tigers signed free agent 1B Lance Durham to a minor league contract. |
| Feb 17, 2012 | Signed as free agent | Jorge Padilla | — | Miami Marlins | Miami Marlins signed free agent OF Jorge Padilla to a minor league contract. |
| Feb 17, 2012 | Signed as free agent | David Colina | — | Tampa Bay Rays | Tampa Bay Rays signed free agent 3B David Colina to a minor league contract. |
| Feb 17, 2012 | Signed as free agent | Jonas Lantigua | — | San Diego Padres | San Diego Padres signed free agent 1B Jonas Lantigua to a minor league contract. |
| Feb 17, 2012 | Signed as free agent | Elou Jean | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Elou Jean to a minor league contract. |
| Feb 16, 2012 | Signed as free agent | Ross Ohlendorf | — | Boston Red Sox | Boston Red Sox signed free agent RHP Ross Ohlendorf to a minor league contract and invited him to spring training. |
| Feb 16, 2012 | Signed as free agent | Travis Blackley | — | San Francisco Giants | San Francisco Giants signed free agent LHP Travis Blackley to a minor league contract. |
| Feb 16, 2012 | Released | Hideki Okajima | — | New York Yankees | New York Yankees released LHP Hideki Okajima. |
| Feb 16, 2012 | Signed as free agent | Kris Harvey | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Kris Harvey to a minor league contract. |
| Feb 16, 2012 | Signed as free agent | Jose Martinez | — | Houston Astros | Houston Astros signed free agent SS Jose Martinez to a minor league contract. |
| Feb 16, 2012 | Signed as free agent | Ivan Castillo | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Ivan Castillo to a minor league contract. |
| Feb 16, 2012 | Signed as free agent | Anthony Basora | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent LHP Anthony Basora to a minor league contract. |
| Feb 16, 2012 | Signed as free agent | Luis F. Castillo | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Luis Castillo to a minor league contract. |
| Feb 16, 2012 | Signed as free agent | Enmanuel Ortiz | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Enmanuel Ortiz to a minor league contract. |
| Feb 16, 2012 | Signed as free agent | Mitch Mustain | — | Chicago White Sox | Chicago White Sox signed free agent RHP Mitch Mustain to a minor league contract. |
| Feb 15, 2012 | Signed as free agent | Jamey Wright | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Jamey Wright to a minor league contract and invited him to spring training. |
| Feb 15, 2012 | Signed as free agent | Ramón Ortiz | — | San Francisco Giants | San Francisco Giants signed free agent RHP Ramon Ortiz to a minor league contract and invited him to spring training. |
| Feb 15, 2012 | Signed as free agent | Rafael Pujols | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Rafael Pujols to a minor league contract. |
| Feb 15, 2012 | Signed as free agent | Unnamed | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Junior Vicent to a minor league contract. |
| Feb 15, 2012 | Signed as free agent | Simon Paulino | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Simon Paulino to a minor league contract. |
| Feb 14, 2012 | Signed as free agent | Kosuke Fukudome | — | Chicago White Sox | Chicago White Sox signed free agent RF Kosuke Fukudome. |
| Feb 14, 2012 | Signed as free agent | Brad Coon | — | Tampa Bay Rays | Tampa Bay Rays signed free agent CF Brad Coon to a minor league contract and invited him to spring training. |
| Feb 14, 2012 | Signed as free agent | Jeff Salazar | — | Tampa Bay Rays | Tampa Bay Rays signed free agent LF Jeff Salazar to a minor league contract and invited him to spring training. |
| Feb 14, 2012 | Released | Clay Rapada | — | Baltimore Orioles | Baltimore Orioles released LHP Clay Rapada. |
| Feb 14, 2012 | Signed as free agent | Eddy Melo | — | Kansas City Royals | Kansas City Royals signed free agent C Eddy Melo to a minor league contract. |
| Feb 14, 2012 | Signed as free agent | Wander Bautista | — | Kansas City Royals | Kansas City Royals signed free agent SS Wander Bautista to a minor league contract. |
| Feb 14, 2012 | Signed as free agent | Jared Lansford | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent Jared Lansford. |
| Feb 13, 2012 | Released | Justin Christian | — | San Francisco Giants | San Francisco Giants released LF Justin Christian. |
| Feb 13, 2012 | Signed as free agent | Dave Valesente | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent C Dave Valesente to a minor league contract. |
| Feb 11, 2012 | Signed as free agent | Peter Moylan | — | Atlanta Braves | Atlanta Braves signed free agent RHP Peter Moylan to a minor league contract and invited him to spring training. |
| Feb 10, 2012 | Signed as free agent | Luis Ayala | — | Baltimore Orioles | Baltimore Orioles signed free agent Luis Ayala. |
| Feb 10, 2012 | Signed as free agent | Scott Linebrink | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Scott Linebrink to a minor league contract and invited him to spring training. |
| Feb 10, 2012 | Signed as free agent | Greg Burke | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Greg Burke to a minor league contract. |
| Feb 10, 2012 | Signed as free agent | Nick Johnson | — | Baltimore Orioles | Baltimore Orioles signed free agent Nick Johnson. |
| Feb 10, 2012 | Signed as free agent | Mario Querales | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Mario Querales to a minor league contract. |
| Feb 9, 2012 | Signed as free agent | Ricky Perez | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Ricky Perez to a minor league contract. |
| Feb 9, 2012 | Signed as free agent | Zack Segovia | — | Detroit Tigers | Detroit Tigers signed free agent RHP Zack Segovia to a minor league contract. |
| Feb 9, 2012 | Signed | Jose Zambrano | — | Detroit Tigers | Detroit Tigers signed SS Jose Zambrano. |
| Feb 9, 2012 | Signed as free agent | Yunior Aybar | — | Atlanta Braves | Atlanta Braves signed free agent 2B Yunior Aybar to a minor league contract. |
| Feb 9, 2012 | Signed as free agent | Gerson Nunez | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent OF Gerson Nunez to a minor league contract. |
| Feb 9, 2012 | Signed as free agent | Gustavo Perinan | — | Toronto Blue Jays | Toronto Blue Jays signed free agent 3B Gustavo Perinan to a minor league contract. |
| Feb 8, 2012 | Signed as free agent | Jeff Francis | — | Cincinnati Reds | Cincinnati Reds signed free agent LHP Jeff Francis to a minor league contract and invited him to spring training. |
| Feb 8, 2012 | Signed as free agent | Ryan Ludwick | — | Cincinnati Reds | Cincinnati Reds signed free agent LF Ryan Ludwick. |
| Feb 8, 2012 | Signed as free agent | Jeff Suppan | — | San Diego Padres | San Diego Padres signed free agent RHP Jeff Suppan to a minor league contract and invited him to spring training. |
| Feb 8, 2012 | Signed as free agent | Russell Branyan | — | New York Yankees | New York Yankees signed free agent 1B Russell Branyan to a minor league contract and invited him to spring training. |
| Feb 8, 2012 | Signed as free agent | Guillermo Mota | — | San Francisco Giants | San Francisco Giants signed free agent RHP Guillermo Mota. |
| Feb 8, 2012 | Signed as free agent | Ryan Theriot | — | San Francisco Giants | San Francisco Giants signed free agent 2B Ryan Theriot. |
| Feb 8, 2012 | Signed as free agent | Clay Hensley | — | San Francisco Giants | San Francisco Giants signed free agent RHP Clay Hensley. |
| Feb 8, 2012 | Signed as free agent | Bill Hall | — | New York Yankees | New York Yankees signed free agent 2B Bill Hall to a minor league contract and invited him to spring training. |
| Feb 8, 2012 | Signed as free agent | Doug Bernier | — | New York Yankees | New York Yankees signed free agent SS Doug Bernier to a minor league contract and invited him to spring training. |
| Feb 8, 2012 | Signed as free agent | Michael De La Cruz | — | Chicago Cubs | Chicago Cubs signed free agent RHP Michael De La Cruz to a minor league contract. |
| Feb 8, 2012 | Signed as free agent | Liarvis Breto | — | Seattle Mariners | Seattle Mariners signed free agent LHP Liarvis Breto to a minor league contract. |
| Feb 7, 2012 | Signed as free agent | Casey Fossum | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Casey Fossum to a minor league contract. |
| Feb 7, 2012 | Signed as free agent | Jeff Larish | — | Baltimore Orioles | Baltimore Orioles signed free agent Jeff Larish. |
| Feb 7, 2012 | Signed as free agent | Justin Edwards | — | Colorado Rockies | Colorado Rockies signed free agent LHP Justin Edwards to a minor league contract. |
| Feb 7, 2012 | Signed as free agent | Chase Lambin | — | Miami Marlins | Miami Marlins signed free agent 3B Chase Lambin to a minor league contract. |
| Feb 7, 2012 | Signed as free agent | Tom Cochran | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LHP Tom Cochran to a minor league contract. |
| Feb 7, 2012 | Signed as free agent | Melvin Tejada | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Melvin Tejada to a minor league contract. |
| Feb 7, 2012 | Signed as free agent | Santo Vizcaino | — | Cleveland Guardians | Cleveland Indians signed free agent LHP Santo Vizcaino to a minor league contract. |
| Feb 7, 2012 | Signed as free agent | Ignacio Valdez | — | Detroit Tigers | Detroit Tigers signed free agent OF Ignacio Valdez to a minor league contract. |
| Feb 6, 2012 | Trade | Jeremy Guthrie | Baltimore Orioles | Colorado Rockies | Baltimore Orioles traded RHP Jeremy Guthrie to Colorado Rockies for RHP Jason Hammel and RHP Matt Lindstrom. |
| Feb 6, 2012 | Signed as free agent | Alex Cora | — | St. Louis Cardinals | St. Louis Cardinals signed free agent 2B Alex Cora to a minor league contract and invited him to spring training. |
| Feb 6, 2012 | Signed as free agent | Shawn Camp | — | Seattle Mariners | Seattle Mariners signed free agent RHP Shawn Camp. |
| Feb 6, 2012 | Signed as free agent | Hung-Chih Kuo | — | Seattle Mariners | Seattle Mariners signed free agent LHP Hung-Chih Kuo. |
| Feb 6, 2012 | Signed as free agent | Joe Beimel | — | Texas Rangers | Texas Rangers signed free agent LHP Joe Beimel to a minor league contract and invited him to spring training. |
| Feb 6, 2012 | Signed as free agent | Conor Jackson | — | Texas Rangers | Texas Rangers signed free agent LF Conor Jackson to a minor league contract and invited him to spring training. |
| Feb 6, 2012 | Signed as free agent | Rick Ankiel | — | Washington Nationals | Washington Nationals signed free agent CF Rick Ankiel to a minor league contract and invited him to spring training. |
| Feb 6, 2012 | Signed as free agent | Mark Teahen | — | Washington Nationals | Washington Nationals signed free agent 3B Mark Teahen to a minor league contract and invited him to spring training. |
| Feb 6, 2012 | Signed as free agent | Justin Ruggiano | — | Houston Astros | Houston Astros signed free agent LF Justin Ruggiano to a minor league contract and invited him to spring training. |
| Feb 6, 2012 | Signed as free agent | Andury Acevedo | — | New York Yankees | New York Yankees signed free agent RHP Andury Acevedo to a minor league contract. |
| Feb 6, 2012 | Signed as free agent | David Remedios | — | New York Yankees | New York Yankees signed free agent C David Remedios to a minor league contract. |
| Feb 6, 2012 | Signed as free agent | Efrain Paredes | — | Cleveland Guardians | Cleveland Indians signed free agent LHP Efrain Paredes to a minor league contract. |
| Feb 6, 2012 | Signed as free agent | Israel Soto | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Israel Soto to a minor league contract. |
| Feb 5, 2012 | Signed as free agent | Branly Crisostomo | — | Kansas City Royals | Kansas City Royals signed free agent RHP Branly Crisostomo to a minor league contract. |
| Feb 5, 2012 | Signed as free agent | Eury Sanchez | — | San Francisco Giants | San Francisco Giants signed free agent RHP Eury Sanchez to a minor league contract. |
| Feb 5, 2012 | Signed as free agent | Ben Leslie | — | San Francisco Giants | San Francisco Giants signed free agent RF Ben Leslie to a minor league contract. |
| Feb 4, 2012 | Signed as free agent | Koby Clemens | — | Toronto Blue Jays | Toronto Blue Jays signed free agent 1B Koby Clemens to a minor league contract. |
| Feb 4, 2012 | Signed as free agent | Andres Aguilar | — | Baltimore Orioles | Baltimore Orioles signed free agent OF Andres Aguilar to a minor league contract. |
| Feb 4, 2012 | Signed as free agent | Brent Dlugach | — | Detroit Tigers | Detroit Tigers signed free agent SS Brent Dlugach to a minor league contract. |
| Feb 4, 2012 | Signed as free agent | Anfernee Benitez | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent LHP Anfernee Benitez to a minor league contract. |
| Feb 3, 2012 | Signed as free agent | Casey Kotchman | — | Cleveland Guardians | Cleveland Indians signed free agent 1B Casey Kotchman. |
| Feb 3, 2012 | Signed as free agent | Dan Johnson | — | Chicago White Sox | Chicago White Sox signed free agent 1B Dan Johnson to a minor league contract and invited him to spring training. |
| Feb 3, 2012 | Signed as free agent | Todd Coffey | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Todd Coffey. |
| Feb 3, 2012 | Signed as free agent | Jason Christian | — | Cincinnati Reds | Cincinnati Reds signed free agent 3B Jason Christian to a minor league contract. |
| Feb 3, 2012 | Signed as free agent | Mitch Atkins | — | Washington Nationals | Washington Nationals signed free agent RHP Mitch Atkins to a minor league contract. |
| Feb 3, 2012 | Signed as free agent | Andrew Sisco | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LHP Andrew Sisco to a minor league contract. |
| Feb 3, 2012 | Signed as free agent | Stu Pomeranz | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Stu Pomeranz to a minor league contract. |
| Feb 3, 2012 | Signed as free agent | Angel Heredia | — | Houston Astros | Houston Astros signed free agent SS Angel Heredia to a minor league contract. |
| Feb 2, 2012 | Signed as free agent | Edwin Jackson | — | Washington Nationals | Washington Nationals signed free agent RHP Edwin Jackson. |
| Feb 2, 2012 | Signed as free agent | Micah Owings | — | San Diego Padres | San Diego Padres signed free agent RHP Micah Owings. |
| Feb 2, 2012 | Signed as free agent | Steve Holm | — | Colorado Rockies | Colorado Rockies signed free agent C Steve Holm to a minor league contract. |
| Feb 2, 2012 | Signed as free agent | Mauro Gomez | — | Boston Red Sox | Boston Red Sox signed free agent Mauro Gomez. |
| Feb 2, 2012 | Signed as free agent | Mauro Gomez | — | Boston Red Sox | Boston Red Sox signed free agent 1B Mauro Gomez to a minor league contract and invited him to spring training. |
| Feb 2, 2012 | Signed as free agent | Wirfin Obispo | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Wirfin Obispo to a minor league contract. |
| Feb 2, 2012 | Signed as free agent | Chris Colabello | — | Minnesota Twins | Minnesota Twins signed free agent 1B Chris Colabello to a minor league contract. |
| Feb 2, 2012 | Signed as free agent | Jorge L. Rodriguez | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Jorge L. Rodriguez to a minor league contract. |
| Feb 2, 2012 | Signed as free agent | Fernando Romero | — | Minnesota Twins | Minnesota Twins signed free agent RHP Fernando Romero to a minor league contract. |
| Feb 1, 2012 | Signed as free agent | Francisco Cordero | — | Toronto Blue Jays | Toronto Blue Jays signed free agent Francisco Cordero. |
| Feb 1, 2012 | Signed as free agent | Juan Cruz | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Juan Cruz to a minor league contract and invited him to spring training. |
| Feb 1, 2012 | Signed as free agent | Carlos Guillén | — | Seattle Mariners | Seattle Mariners signed free agent 2B Carlos Guillen to a minor league contract and invited him to spring training. |
| Feb 1, 2012 | Released | Rick Van Den Hurk | — | Baltimore Orioles | Baltimore Orioles released RHP Rick van den Hurk. |
| Feb 1, 2012 | Signed as free agent | Chris Tremblay | — | Baltimore Orioles | Baltimore Orioles signed free agent 2B Chris Tremblay to a minor league contract. |
| Feb 1, 2012 | Signed as free agent | Roman Hernandez | — | Kansas City Royals | Kansas City Royals signed free agent OF Roman Hernandez to a minor league contract. |
| Feb 1, 2012 | Signed as free agent | Chris Pettit | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent LF Chris Pettit to a minor league contract. |
| Feb 1, 2012 | Signed as free agent | Aneury Osoria | — | Miami Marlins | Miami Marlins signed free agent RHP Aneury Osoria to a minor league contract. |
| Feb 1, 2012 | Signed as free agent | Yonqueli Perez | — | Miami Marlins | Miami Marlins signed free agent RHP Yonqueli Perez to a minor league contract. |
| Feb 1, 2012 | Signed as free agent | Estarlin Arias | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Estarlin Arias to a minor league contract. |
| Jan 31, 2012 | Trade | Russ Canzler | Tampa Bay Rays | Cleveland Guardians | Tampa Bay Rays traded 3B Russ Canzler to Cleveland Indians. |
| Jan 31, 2012 | Signed as free agent | Chad Qualls | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Chad Qualls. |
| Jan 31, 2012 | Signed as free agent | Livan Hernandez | — | Houston Astros | Houston Astros signed free agent Livan Hernandez. |
| Jan 31, 2012 | Signed as free agent | Hernan Iribarren | — | Colorado Rockies | Colorado Rockies signed free agent 2B Hernan Iribarren to a minor league contract. |
| Jan 31, 2012 | Signed as free agent | Yoshihiro Doi | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Yoshihiro Doi to a minor league contract. |
| Jan 31, 2012 | Signed as free agent | Chad Durbin | — | Washington Nationals | Washington Nationals signed free agent RHP Chad Durbin to a minor league contract and invited him to spring training. |
| Jan 30, 2012 | Signed as free agent | Trever Miller | — | Chicago Cubs | Chicago Cubs signed free agent LHP Trever Miller to a minor league contract and invited him to spring training. |
| Jan 30, 2012 | Signed as free agent | Armando Galarraga | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Armando Galarraga to a minor league contract and invited him to spring training. |
| Jan 30, 2012 | Signed as free agent | Pat Neshek | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Pat Neshek to a minor league contract and invited him to spring training. |
| Jan 30, 2012 | Signed as free agent | Ronny Paulino | — | Baltimore Orioles | Baltimore Orioles signed free agent C Ronny Paulino to a minor league contract and invited him to spring training. |
| Jan 30, 2012 | Signed as free agent | Mike Hessman | — | Houston Astros | Houston Astros signed free agent 3B Mike Hessman to a minor league contract. |
| Jan 30, 2012 | Signed as free agent | Brad Eldred | — | Detroit Tigers | Detroit Tigers signed free agent 1B Brad Eldred to a minor league contract. |
| Jan 30, 2012 | Signed as free agent | Adanniel Blanco | — | Kansas City Royals | Kansas City Royals signed free agent 3B Adanniel Blanco to a minor league contract. |
| Jan 30, 2012 | Signed as free agent | Cole Armstrong | — | Miami Marlins | Miami Marlins signed free agent C Cole Armstrong to a minor league contract. |
| Jan 30, 2012 | Signed as free agent | Corey Patterson | — | Milwaukee Brewers | Milwaukee Brewers signed free agent LF Corey Patterson. |
| Jan 30, 2012 | Signed as free agent | Carlos Vasquez | — | Houston Astros | Houston Astros signed free agent RHP Carlos Vasquez to a minor league contract. |
| Jan 30, 2012 | Signed as free agent | Yohan Padron | — | Colorado Rockies | Colorado Rockies signed free agent LHP Yohan Padron to a minor league contract. |
| Jan 29, 2012 | Signed as free agent | Jared Springer | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Jared Springer to a minor league contract. |
| Jan 29, 2012 | Signed as free agent | Gaby Hernandez | — | Washington Nationals | Washington Nationals signed free agent Gaby Hernandez. |
| Jan 29, 2012 | Signed as free agent | Enger Jimenez | — | Philadelphia Phillies | Philadelphia Phillies signed free agent OF Enger Jimenez to a minor league contract. |
| Jan 28, 2012 | Signed as free agent | Kyle Hudson | — | Texas Rangers | Texas Rangers signed free agent Kyle Hudson. |
| Jan 28, 2012 | Signed as free agent | Brian Tallet | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent LHP Brian Tallet to a minor league contract. |
| Jan 28, 2012 | Signed as free agent | Erik Morrison | — | Chicago White Sox | Chicago White Sox signed free agent 2B Erik Morrison to a minor league contract. |
| Jan 28, 2012 | Signed as free agent | Roman Colon | — | Kansas City Royals | Kansas City Royals signed free agent RHP Roman Colon to a minor league contract. |
| Jan 28, 2012 | Signed as free agent | Jorge Mateo | — | New York Yankees | New York Yankees signed free agent SS Jorge Mateo to a minor league contract. |
| Jan 27, 2012 | Signed as free agent | Juan Pierre | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LF Juan Pierre to a minor league contract and invited him to spring training. |
| Jan 27, 2012 | Signed as free agent | Zach Duke | — | Houston Astros | Houston Astros signed free agent LHP Zach Duke to a minor league contract and invited him to spring training. |
| Jan 27, 2012 | Signed as free agent | Matt Tuiasosopo | — | New York Mets | New York Mets signed free agent 2B Matt Tuiasosopo to a minor league contract. |
| Jan 27, 2012 | Signed as free agent | Jeff Keppinger | — | Tampa Bay Rays | Tampa Bay Rays signed free agent 2B Jeff Keppinger. |
| Jan 27, 2012 | Signed as free agent | Manny Delcarmen | — | New York Yankees | New York Yankees signed free agent RHP Manny Delcarmen to a minor league contract and invited him to spring training. |
| Jan 27, 2012 | Signed as free agent | Vinnie Chulk | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Vinnie Chulk to a minor league contract. |
| Jan 27, 2012 | Signed as free agent | Scott Olsen | — | Chicago White Sox | Chicago White Sox signed free agent LHP Scott Olsen to a minor league contract. |
| Jan 27, 2012 | Signed as free agent | Jair Fernandez | — | Houston Astros | Houston Astros signed free agent C Jair Fernandez to a minor league contract. |
| Jan 27, 2012 | Signed as free agent | Adrian Gutierrez | — | Los Angeles Angels | Los Angeles Angels signed free agent C Adrian Gutierrez to a minor league contract. |
| Jan 27, 2012 | Signed as free agent | Brian Sweeney | — | Seattle Mariners | Seattle Mariners signed free agent RHP Brian Sweeney to a minor league contract. |
| Jan 27, 2012 | Signed as free agent | Yairo Muñoz | — | Athletics | Oakland Athletics signed free agent SS Yairo Munoz to a minor league contract. |
| Jan 27, 2012 | Signed as free agent | Michael Santos | — | San Francisco Giants | San Francisco Giants signed free agent Michael Santos. |
| Jan 27, 2012 | Signed as free agent | Victor Cabral | — | Cleveland Guardians | Cleveland Indians signed free agent OF Victor Cabral to a minor league contract. |
| Jan 26, 2012 | Signed as free agent | Prince Fielder | — | Detroit Tigers | Detroit Tigers signed free agent Prince Fielder. |
| Jan 26, 2012 | Signed as free agent | Brad Lidge | — | Washington Nationals | Washington Nationals signed free agent RHP Brad Lidge. |
| Jan 26, 2012 | Signed as free agent | Jonny Gomes | — | Athletics | Oakland Athletics signed free agent LF Jonny Gomes. |
| Jan 26, 2012 | Signed as free agent | Cody Ross | — | Boston Red Sox | Boston Red Sox signed free agent OF Cody Ross. |
| Jan 26, 2012 | Signed as free agent | Hiroki Kuroda | — | New York Yankees | New York Yankees signed free agent RHP Hiroki Kuroda. |
| Jan 26, 2012 | Signed as free agent | Dan Wheeler | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Dan Wheeler to a minor league contract and invited him to spring training. |
| Jan 26, 2012 | Signed as free agent | Jose De La Torre | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Jose De La Torre to a minor league contract. |
| Jan 26, 2012 | Signed as free agent | Ryan Rohlinger | — | Cleveland Guardians | Cleveland Indians signed free agent 3B Ryan Rohlinger to a minor league contract. |
| Jan 26, 2012 | Signed as free agent | Kyle Phillips | — | Toronto Blue Jays | Toronto Blue Jays signed free agent C Kyle Phillips to a minor league contract. |
| Jan 26, 2012 | Signed as free agent | Josh Schmidt | — | Miami Marlins | Miami Marlins signed free agent RHP Josh Schmidt to a minor league contract. |
| Jan 26, 2012 | Signed as free agent | Gregory Valencia | — | New York Mets | New York Mets signed free agent 3B Gregory Valencia to a minor league contract. |
| Jan 26, 2012 | Signed as free agent | Nicolas Debora | — | New York Mets | New York Mets signed free agent RHP Nicolas Debora to a minor league contract. |
| Jan 26, 2012 | Signed as free agent | Rigoberto Perez | — | New York Mets | New York Mets signed free agent RHP Rigoberto Perez to a minor league contract. |
| Jan 26, 2012 | Signed as free agent | Luis Popa | — | New York Mets | New York Mets signed free agent RHP Luis Popa to a minor league contract. |
| Jan 26, 2012 | Signed as free agent | Reudis Reyes | — | Minnesota Twins | Minnesota Twins signed free agent RHP Reudis Reyes to a minor league contract. |
| Jan 25, 2012 | Trade | Jeremy Horst | Cincinnati Reds | Philadelphia Phillies | Philadelphia Phillies traded SS Wilson Valdez to Cincinnati Reds for LHP Jeremy Horst. |
| Jan 25, 2012 | Signed as free agent | Willie Harris | — | Cincinnati Reds | Cincinnati Reds signed free agent LF Willie Harris to a minor league contract and invited him to spring training. |
| Jan 25, 2012 | Signed as free agent | Andruw Jones | — | New York Yankees | New York Yankees signed free agent RF Andruw Jones. |
| Jan 25, 2012 | Signed as free agent | Austin Kearns | — | Miami Marlins | Miami Marlins signed free agent LF Austin Kearns to a minor league contract and invited him to spring training. |
| Jan 25, 2012 | Signed as free agent | Scott Thomas | — | Baltimore Orioles | Baltimore Orioles signed free agent C Scott Thomas to a minor league contract. |
| Jan 25, 2012 | Signed as free agent | Mitch Canham | — | Colorado Rockies | Colorado Rockies signed free agent 1B Mitch Canham to a minor league contract. |
| Jan 25, 2012 | Signed as free agent | Tim Kelley | — | Detroit Tigers | Detroit Tigers signed free agent RHP Tim Kelley to a minor league contract. |
| Jan 25, 2012 | Signed as free agent | Orlando Mercado | — | Miami Marlins | Miami Marlins signed free agent Orlando Mercado. |
| Jan 25, 2012 | Signed as free agent | Sean White | — | Boston Red Sox | Boston Red Sox signed free agent RHP Sean White to a minor league contract. |
| Jan 25, 2012 | Signed as free agent | Eric Junge | — | Atlanta Braves | Atlanta Braves signed free agent RHP Eric Junge to a minor league contract. |
| Jan 25, 2012 | Signed as free agent | Todd Linden | — | San Francisco Giants | San Francisco Giants signed free agent LF Todd Linden to a minor league contract. |
| Jan 25, 2012 | Signed as free agent | Sergio Ripoll | — | St. Louis Cardinals | St. Louis Cardinals signed free agent C Sergio Ripoll to a minor league contract. |
| Jan 25, 2012 | Signed as free agent | Isaac Silva | — | St. Louis Cardinals | St. Louis Cardinals signed free agent LHP Isaac Silva to a minor league contract. |
| Jan 25, 2012 | Signed as free agent | Ramon Santos | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Ramon Santos to a minor league contract. |
| Jan 25, 2012 | Signed as free agent | Esteban Vallejo | — | St. Louis Cardinals | St. Louis Cardinals signed free agent RHP Esteban Vallejo to a minor league contract. |
| Jan 24, 2012 | Signed as free agent | Omar Vizquel | — | Toronto Blue Jays | Toronto Blue Jays signed free agent SS Omar Vizquel to a minor league contract and invited him to spring training. |
| Jan 24, 2012 | Signed as free agent | Wilson Betemit | — | Baltimore Orioles | Baltimore Orioles signed free agent 3B Wilson Betemit. |
| Jan 24, 2012 | Signed as free agent | Kevin Millwood | — | Seattle Mariners | Seattle Mariners signed free agent RHP Kevin Millwood to a minor league contract and invited him to spring training. |
| Jan 24, 2012 | Signed as free agent | Bartolo Colon | — | Athletics | Oakland Athletics signed free agent RHP Bartolo Colon. |
| Jan 24, 2012 | Signed as free agent | Carlos Pena | — | Tampa Bay Rays | Tampa Bay Rays signed free agent 1B Carlos Pena. |
| Jan 24, 2012 | Signed as free agent | Bryan Augenstein | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Bryan Augenstein to a minor league contract and invited him to spring training. |
| Jan 24, 2012 | Signed as free agent | Matt Zaleski | — | Chicago White Sox | Chicago White Sox signed free agent RHP Matt Zaleski to a minor league contract. |
| Jan 24, 2012 | Signed as free agent | Connor Graham | — | Colorado Rockies | Colorado Rockies signed free agent Connor Graham. |
| Jan 24, 2012 | Signed as free agent | Chris McMurray | — | Colorado Rockies | Colorado Rockies signed free agent C Chris McMurray to a minor league contract. |
| Jan 24, 2012 | Signed as free agent | Jordan Kreke | — | Houston Astros | Houston Astros signed free agent 2B Jordan Kreke to a minor league contract. |
| Jan 24, 2012 | Signed as free agent | Yimaury Pena | — | Kansas City Royals | Kansas City Royals signed free agent RHP Yimauri Pena to a minor league contract. |
| Jan 24, 2012 | Signed as free agent | Bill Murphy | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Bill Murphy to a minor league contract. |
| Jan 24, 2012 | Signed as free agent | Adrian Almeida | — | New York Mets | New York Mets signed free agent LHP Adrian Almeida to a minor league contract. |
| Jan 24, 2012 | Signed as free agent | Unnamed | — | New York Mets | New York Mets signed free agent RHP Marcos Molina to a minor league contract. |
| Jan 24, 2012 | Signed as free agent | Janry Obispo | — | Detroit Tigers | Detroit Tigers signed free agent RHP Janry Obispo to a minor league contract. |
| Jan 24, 2012 | Signed as free agent | Sandy Rodriguez | — | Detroit Tigers | Detroit Tigers signed free agent C Sandy Rodriguez to a minor league contract. |
| Jan 23, 2012 | Signed as free agent | Delwyn Young | — | Chicago White Sox | Chicago White Sox signed free agent RF Delwyn Young to a minor league contract and invited him to spring training. |
| Jan 23, 2012 | Trade | Jose Campos | Seattle Mariners | New York Yankees | New York Yankees traded C Jesus Montero and RHP Hector Noesi to Seattle Mariners for RHP Michael Pineda and RHP Jose Campos. |
| Jan 23, 2012 | Signed as free agent | Robbie Perkins | — | Colorado Rockies | Colorado Rockies signed free agent C Robbie Perkins to a minor league contract. |
| Jan 23, 2012 | Signed as free agent | Warwick Saupold | — | Detroit Tigers | Detroit Tigers signed free agent RHP Warwick Saupold to a minor league contract. |
| Jan 23, 2012 | Signed as free agent | Bobby Bramhall | — | Miami Marlins | Miami Marlins signed free agent LHP Bobby Bramhall to a minor league contract. |
| Jan 23, 2012 | Signed as free agent | Chris Aguila | — | Miami Marlins | Miami Marlins signed free agent RF Chris Aguila to a minor league contract. |
| Jan 23, 2012 | Signed as free agent | Tim Redding | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Tim Redding to a minor league contract. |
| Jan 23, 2012 | Signed as free agent | Greg Smith | — | Los Angeles Angels | Los Angeles Angels signed free agent LHP Greg Smith to a minor league contract. |
| Jan 23, 2012 | Signed as free agent | Yeisson Fernandez | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LHP Yeisson Fernandez to a minor league contract. |
| Jan 23, 2012 | Signed as free agent | Joaquin Cleto | — | Seattle Mariners | Seattle Mariners signed free agent RHP Joaquin Cleto to a minor league contract. |
| Jan 23, 2012 | Signed as free agent | Arismendy Franco | — | Seattle Mariners | Seattle Mariners signed free agent RHP Arismendy Franco to a minor league contract. |
| Jan 23, 2012 | Signed as free agent | Andres Garcia | — | Seattle Mariners | Seattle Mariners signed free agent RHP Andres Garcia to a minor league contract. |
| Jan 22, 2012 | Signed as free agent | Jordan Brown | — | Houston Astros | Houston Astros signed free agent Jordan Brown. |
| Jan 22, 2012 | Signed as free agent | Felix Encarnacion | — | Kansas City Royals | Kansas City Royals signed free agent RHP Felix Encarnacion to a minor league contract. |
| Jan 22, 2012 | Signed as free agent | Yojensy Arias | — | Kansas City Royals | Kansas City Royals signed free agent LHP Yojensy Arias to a minor league contract. |
| Jan 22, 2012 | Signed as free agent | Oberdan Diaz | — | Philadelphia Phillies | Philadelphia Phillies signed free agent LHP Oberdan Diaz to a minor league contract. |
| Jan 22, 2012 | Signed as free agent | Jorge Zavala | — | Atlanta Braves | Atlanta Braves signed free agent RHP Jorge Zavala to a minor league contract. |
| Jan 21, 2012 | Trade | Marco Scutaro | Boston Red Sox | Colorado Rockies | Boston Red Sox traded 2B Marco Scutaro to Colorado Rockies for RHP Clayton Mortensen. |
| Jan 21, 2012 | Signed as free agent | Mitch Stetter | — | Texas Rangers | Texas Rangers signed free agent LHP Mitch Stetter to a minor league contract and invited him to spring training. |
| Jan 20, 2012 | Signed as free agent | Gary Glover | — | Miami Marlins | Miami Marlins signed free agent RHP Gary Glover to a minor league contract and invited him to spring training. |
| Jan 20, 2012 | Signed as free agent | Terry Tiffee | — | Miami Marlins | Miami Marlins signed free agent 3B Terry Tiffee to a minor league contract and invited him to spring training. |
| Jan 20, 2012 | Signed as free agent | Chris Snyder | — | Houston Astros | Houston Astros signed free agent C Chris Snyder. |
| Jan 20, 2012 | Signed as free agent | Gregorio Petit | — | Cleveland Guardians | Cleveland Indians signed free agent 2B Gregorio Petit to a minor league contract and invited him to spring training. |
| Jan 20, 2012 | Signed as free agent | Ryan Madson | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Ryan Madson. |
| Jan 20, 2012 | Trade | Kevin Slowey | Colorado Rockies | Cleveland Guardians | Cleveland Indians traded RHP Zach Putnam to Colorado Rockies for RHP Kevin Slowey. |
| Jan 20, 2012 | Signed as free agent | Ryan Spilborghs | — | Cleveland Guardians | Cleveland Indians signed free agent RF Ryan Spilborghs to a minor league contract and invited him to spring training. |
| Jan 20, 2012 | Signed as free agent | Brad Hawpe | — | Texas Rangers | Texas Rangers signed free agent 1B Brad Hawpe to a minor league contract and invited him to spring training. |
| Jan 20, 2012 | Signed as free agent | Bobby Scales | — | Chicago Cubs | Chicago Cubs signed free agent 2B Bobby Scales to a minor league contract and invited him to spring training. |
| Jan 20, 2012 | Signed as free agent | Dennys Reyes | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Dennys Reyes to a minor league contract and invited him to spring training. |
| Jan 20, 2012 | Signed as free agent | Oscar Villarreal | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Oscar Villarreal to a minor league contract and invited him to spring training. |
| Jan 20, 2012 | Signed as free agent | Robert Hinton | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Robert Hinton to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | Chris George | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Chris George to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | Cory Aldridge | — | Baltimore Orioles | Baltimore Orioles signed free agent RF Cory Aldridge to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | Wilkin De La Rosa | — | Cincinnati Reds | Cincinnati Reds signed free agent LHP Wilkin De La Rosa to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | James Ewing | — | Cincinnati Reds | Cincinnati Reds signed free agent 2B James Ewing to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | Tyler Johnson | — | Colorado Rockies | Colorado Rockies signed free agent LHP Tyler Johnson to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | Ed Lucas | — | Los Angeles Angels | Los Angeles Angels signed free agent 3B Ed Lucas to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | Paul McAnulty | — | Los Angeles Angels | Los Angeles Angels signed free agent 1B Paul McAnulty to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | Tim Corcoran | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Tim Corcoran to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | Jose Duarte | — | Miami Marlins | Miami Marlins signed free agent CF Jose Duarte to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | Henry Garcia | — | Colorado Rockies | Colorado Rockies signed free agent IF Henry Garcia to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | Freddy Zorrilla | — | Philadelphia Phillies | Philadelphia Phillies signed free agent OF Freddy Zorrilla to a minor league contract. |
| Jan 20, 2012 | Signed as free agent | Pita Rona | — | Baltimore Orioles | Baltimore Orioles signed free agent 1B Pita Rona to a minor league contract. |
| Jan 19, 2012 | Signed as free agent | Jeremy Accardo | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Jeremy Accardo to a minor league contract and invited him to spring training. |
| Jan 19, 2012 | Signed as free agent | Fred Lewis | — | Cleveland Guardians | Cleveland Indians signed free agent LF Fred Lewis to a minor league contract and invited him to spring training. |
| Jan 19, 2012 | Released | Kyle Hudson | — | Baltimore Orioles | Baltimore Orioles released LF Kyle Hudson. |
| Jan 19, 2012 | Signed as free agent | Nelson Figueroa | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Nelson Figueroa to a minor league contract and invited him to spring training. |
| Jan 19, 2012 | Signed as free agent | Chris Woodward | — | Toronto Blue Jays | Toronto Blue Jays signed free agent SS Chris Woodward to a minor league contract and invited him to spring training. |
| Jan 19, 2012 | Signed as free agent | Brent Clevlen | — | Philadelphia Phillies | Philadelphia Phillies signed free agent OF Brent Clevlen to a minor league contract. |
| Jan 19, 2012 | Signed as free agent | Josh Ford | — | Colorado Rockies | Colorado Rockies signed free agent C Josh Ford to a minor league contract. |
| Jan 19, 2012 | Signed as free agent | Tim Torres | — | Colorado Rockies | Colorado Rockies signed free agent 2B Tim Torres to a minor league contract. |
| Jan 19, 2012 | Signed as free agent | Jose Pujols | — | New York Yankees | New York Yankees signed free agent RHP Jose Pujols to a minor league contract. |
| Jan 18, 2012 | Signed as free agent | Jack Cust | — | Houston Astros | Houston Astros signed free agent RF Jack Cust. |
| Jan 18, 2012 | Signed as free agent | Yu Darvish | — | Texas Rangers | Texas Rangers signed free agent RHP Yu Darvish. |
| Jan 18, 2012 | Signed as free agent | Joel Zumaya | — | Minnesota Twins | Minnesota Twins signed free agent RHP Joel Zumaya. |
| Jan 18, 2012 | Signed as free agent | Oliver Pérez | — | Seattle Mariners | Seattle Mariners signed free agent LHP Oliver Perez to a minor league contract and invited him to spring training. |
| Jan 18, 2012 | Signed as free agent | Brian Burres | — | San Francisco Giants | San Francisco Giants signed free agent LHP Brian Burres to a minor league contract and invited him to spring training. |
| Jan 18, 2012 | Signed as free agent | Wilmin Rodriguez | — | San Francisco Giants | San Francisco Giants signed free agent LHP Wilmin Rodriguez to a minor league contract and invited him to spring training. |
| Jan 18, 2012 | Signed as free agent | Grégor Blanco | — | San Francisco Giants | San Francisco Giants signed free agent LF Gregor Blanco to a minor league contract and invited him to spring training. |
| Jan 18, 2012 | Signed as free agent | Jamie Moyer | — | Colorado Rockies | Colorado Rockies signed free agent LHP Jamie Moyer to a minor league contract and invited him to spring training. |
| Jan 18, 2012 | Signed as free agent | Seongmin Kim | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Seongmin Kim to a minor league contract. |
| Jan 18, 2012 | Signed as free agent | Steven Kent | — | Kansas City Royals | Kansas City Royals signed free agent LHP Steven Kent to a minor league contract. |
| Jan 18, 2012 | Signed as free agent | Michael Camp | — | Miami Marlins | Miami Marlins signed free agent 3B Michael Camp to a minor league contract. |
| Jan 18, 2012 | Signed as free agent | Luke French | — | Minnesota Twins | Minnesota Twins signed free agent LHP Luke French to a minor league contract. |
| Jan 18, 2012 | Signed as free agent | Wes Alsup | — | Seattle Mariners | Seattle Mariners signed free agent RHP Wes Alsup to a minor league contract. |
| Jan 18, 2012 | Signed as free agent | Ben Shorto | — | Cleveland Guardians | Cleveland Indians signed free agent OF Ben Shorto to a minor league contract. |
| Jan 17, 2012 | Signed as free agent | Joel Pineiro | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Joel Pineiro to a minor league contract and invited him to spring training. |
| Jan 17, 2012 | Signed as free agent | Dioner Navarro | — | Cincinnati Reds | Cincinnati Reds signed free agent C Dioner Navarro to a minor league contract and invited him to spring training. |
| Jan 17, 2012 | Signed as free agent | Doug Slaten | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent LHP Doug Slaten to a minor league contract and invited him to spring training. |
| Jan 17, 2012 | Released | Mark Teahen | — | Toronto Blue Jays | Toronto Blue Jays released 3B Mark Teahen. |
| Jan 17, 2012 | Signed as free agent | Norichika Aoki | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RF Norichika Aoki. |
| Jan 17, 2012 | Signed as free agent | Joe Saunders | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent LHP Joe Saunders. |
| Jan 17, 2012 | Signed as free agent | Jésus Feliciano | — | Tampa Bay Rays | Tampa Bay Rays signed free agent LF Jesus Feliciano to a minor league contract and invited him to spring training. |
| Jan 17, 2012 | Signed as free agent | Romulo Sanchez | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Romulo Sanchez to a minor league contract and invited him to spring training. |
| Jan 17, 2012 | Signed as free agent | Damaso Espino | — | Chicago White Sox | Chicago White Sox signed free agent C Damaso Espino to a minor league contract and invited him to spring training. |
| Jan 17, 2012 | Signed as free agent | Max St. Pierre | — | Boston Red Sox | Boston Red Sox signed free agent Max St. Pierre. |
| Jan 17, 2012 | Signed as free agent | P.J. Zocchi | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP P.J. Zocchi to a minor league contract. |
| Jan 17, 2012 | Signed as free agent | Carlos Hernandez | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Carlos Hernandez to a minor league contract. |
| Jan 17, 2012 | Signed as free agent | Ronniel Demorizi | — | Toronto Blue Jays | Toronto Blue Jays signed free agent 2B Ronniel Demorizi to a minor league contract. |
| Jan 16, 2012 | Trade | Seth Smith | Colorado Rockies | Athletics | Oakland Athletics traded RHP Guillermo Moscoso and LHP Josh Outman to Colorado Rockies for LF Seth Smith. |
| Jan 16, 2012 | Signed as free agent | Vicente Padilla | — | Boston Red Sox | Boston Red Sox signed free agent RHP Vicente Padilla to a minor league contract and invited him to spring training. |
| Jan 16, 2012 | Signed as free agent | Alfred Gutierrez | — | Detroit Tigers | Detroit Tigers signed free agent RHP Alfred Gutierrez to a minor league contract. |
| Jan 16, 2012 | Signed | Luis Cedeno | — | Detroit Tigers | Detroit Tigers signed RHP Luis Cedeno. |
| Jan 16, 2012 | Signed as free agent | Junior Carrion | — | New York Mets | New York Mets signed free agent OF Junior Carrion to a minor league contract. |
| Jan 16, 2012 | Signed as free agent | Andres Sotillo | — | Toronto Blue Jays | Toronto Blue Jays signed free agent C Andres Sotillo to a minor league contract. |
| Jan 14, 2012 | Signed as free agent | Kevin Kouzmanoff | — | Kansas City Royals | Kansas City Royals signed free agent 3B Kevin Kouzmanoff to a minor league contract and invited him to spring training. |
| Jan 13, 2012 | Signed as free agent | Willy Lebron | — | Cleveland Guardians | Cleveland Indians signed free agent Willy Lebron. |
| Jan 13, 2012 | Signed as free agent | Jack Wilson | — | Atlanta Braves | Atlanta Braves signed free agent SS Jack Wilson. |
| Jan 13, 2012 | Signed as free agent | Ronny Cedeno | — | New York Mets | New York Mets signed free agent SS Ronny Cedeno. |
| Jan 13, 2012 | Signed as free agent | Ron Mahay | — | Cincinnati Reds | Cincinnati Reds signed free agent LHP Ron Mahay to a minor league contract and invited him to spring training. |
| Jan 13, 2012 | Signed as free agent | Clay Zavada | — | Cincinnati Reds | Cincinnati Reds signed free agent LHP Clay Zavada to a minor league contract and invited him to spring training. |
| Jan 13, 2012 | Signed as free agent | Kerry Wood | — | Chicago Cubs | Chicago Cubs signed free agent RHP Kerry Wood. |
| Jan 13, 2012 | Signed as free agent | Will Rhymes | — | Tampa Bay Rays | Tampa Bay Rays signed free agent 2B Will Rhymes to a minor league contract and invited him to spring training. |
| Jan 13, 2012 | Signed as free agent | Alfredo Amezaga | — | Chicago Cubs | Chicago Cubs signed free agent 2B Alfredo Amezaga to a minor league contract and invited him to spring training. |
| Jan 13, 2012 | Signed as free agent | Will Startup | — | Baltimore Orioles | Baltimore Orioles signed free agent Will Startup. |
| Jan 13, 2012 | Signed as free agent | Peter Fatse | — | Baltimore Orioles | Baltimore Orioles signed free agent 2B Peter Fatse to a minor league contract. |
| Jan 13, 2012 | Signed as free agent | James Avery | — | Detroit Tigers | Detroit Tigers signed free agent RHP James Avery to a minor league contract. |
| Jan 13, 2012 | Signed as free agent | Josh Kroeger | — | Boston Red Sox | Boston Red Sox signed free agent RF Josh Kroeger to a minor league contract and invited him to spring training. |
| Jan 13, 2012 | Signed as free agent | Rayderson Chevalier | — | Houston Astros | Houston Astros signed free agent RHP Rayderson Chevalier to a minor league contract. |
| Jan 13, 2012 | Signed as free agent | Tomas Lopez | — | Houston Astros | Houston Astros signed free agent RHP Tomas Lopez to a minor league contract. |
| Jan 13, 2012 | Signed as free agent | Angel Vargas | — | Atlanta Braves | Atlanta Braves signed free agent 3B Angel Vargas to a minor league contract. |
| Jan 12, 2012 | Signed as free agent | Luke Scott | — | Tampa Bay Rays | Tampa Bay Rays signed free agent DH Luke Scott. |
| Jan 12, 2012 | Signed as free agent | Chris Ray | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Chris Ray to a minor league contract and invited him to spring training. |
| Jan 12, 2012 | Signed as free agent | Ryan Patterson | — | Miami Marlins | Miami Marlins signed free agent OF Ryan Patterson to a minor league contract. |
| Jan 12, 2012 | Signed as free agent | Edgardo Baez | — | Baltimore Orioles | Baltimore Orioles signed free agent OF Edgardo Baez to a minor league contract. |
| Jan 12, 2012 | Signed as free agent | Zach Booker | — | Baltimore Orioles | Baltimore Orioles signed free agent C Zach Booker to a minor league contract. |
| Jan 12, 2012 | Signed as free agent | Ryne Reynoso | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Ryne Reynoso to a minor league contract. |
| Jan 12, 2012 | Signed as free agent | Miguel Burgos | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Miguel Burgos to a minor league contract. |
| Jan 11, 2012 | Signed as free agent | Paul Phillips | — | Milwaukee Brewers | Milwaukee Brewers signed free agent C Paul Phillips to a minor league contract and invited him to spring training. |
| Jan 11, 2012 | Signed as free agent | Scott Hairston | — | New York Mets | New York Mets signed free agent RF Scott Hairston. |
| Jan 11, 2012 | Signed as free agent | Carlos Torres | — | Colorado Rockies | Colorado Rockies signed free agent RHP Carlos Torres to a minor league contract and invited him to spring training. |
| Jan 11, 2012 | Signed as free agent | Winston Abreu | — | Baltimore Orioles | Baltimore Orioles signed free agent Winston Abreu. |
| Jan 11, 2012 | Signed as free agent | Travis Adair | — | Baltimore Orioles | Baltimore Orioles signed free agent LF Travis Adair to a minor league contract. |
| Jan 11, 2012 | Signed as free agent | Thomas Di Benedetto | — | Baltimore Orioles | Baltimore Orioles signed free agent 3B Thomas Di Benedetto to a minor league contract. |
| Jan 11, 2012 | Signed as free agent | Aaron Cook | — | Boston Red Sox | Boston Red Sox signed free agent RHP Aaron Cook to a minor league contract and invited him to spring training. |
| Jan 11, 2012 | Signed as free agent | Henry Mabee | — | Chicago White Sox | Chicago White Sox signed free agent RHP Henry Mabee to a minor league contract. |
| Jan 11, 2012 | Signed as free agent | Chase Weems | — | Colorado Rockies | Colorado Rockies signed free agent C Chase Weems to a minor league contract. |
| Jan 11, 2012 | Signed as free agent | Juan Marcano | — | San Diego Padres | San Diego Padres signed free agent LHP Juan Marcano to a minor league contract. |
| Jan 11, 2012 | Signed as free agent | Juan Kelly | — | Toronto Blue Jays | Toronto Blue Jays signed free agent C Juan Kelly to a minor league contract. |
| Jan 10, 2012 | Signed as free agent | Paul Maholm | — | Chicago Cubs | Chicago Cubs signed free agent Paul Maholm. |
| Jan 10, 2012 | Signed as free agent | Wei-Yin Chen | — | Baltimore Orioles | Baltimore Orioles signed free agent LHP Wei-Yin Chen. |
| Jan 10, 2012 | Signed as free agent | Miguel Batista | — | New York Mets | New York Mets signed free agent Miguel Batista. |
| Jan 10, 2012 | Signed as free agent | Fernando Cabrera | — | New York Mets | New York Mets signed free agent RHP Fernando Cabrera to a minor league contract and invited him to spring training. |
| Jan 10, 2012 | Released | John Bowker | — | Philadelphia Phillies | Philadelphia Phillies released LF John Bowker. |
| Jan 10, 2012 | Signed as free agent | Sean Kazmar Jr. | — | New York Mets | New York Mets signed free agent SS Sean Kazmar to a minor league contract. |
| Jan 10, 2012 | Signed as free agent | Aaron Heilman | — | Seattle Mariners | Seattle Mariners signed free agent RHP Aaron Heilman to a minor league contract and invited him to spring training. |
| Jan 10, 2012 | Signed as free agent | Richard De Los Santos | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Richard De Los Santos to a minor league contract. |
| Jan 10, 2012 | Signed as free agent | Brad Nelson | — | Texas Rangers | Texas Rangers signed free agent 1B Brad Nelson to a minor league contract. |
| Jan 10, 2012 | Signed as free agent | Tim Gustafson | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Tim Gustafson to a minor league contract. |
| Jan 10, 2012 | Signed as free agent | Jorge Cantu | — | Los Angeles Angels | Los Angeles Angels signed free agent 1B Jorge Cantu to a minor league contract and invited him to spring training. |
| Jan 10, 2012 | Signed as free agent | Koyie Hill | — | St. Louis Cardinals | St. Louis Cardinals signed free agent C Koyie Hill to a minor league contract and invited him to spring training. |
| Jan 10, 2012 | Signed as free agent | Joel Guzman | — | Cincinnati Reds | Cincinnati Reds signed free agent 3B Joel Guzman to a minor league contract. |
| Jan 10, 2012 | Signed as free agent | Jason Repko | — | Boston Red Sox | Boston Red Sox signed free agent LF Jason Repko to a minor league contract and invited him to spring training. |
| Jan 10, 2012 | Signed as free agent | Mario Mercedes | — | Chicago Cubs | Chicago Cubs signed free agent C Mario Mercedes to a minor league contract. |
| Jan 10, 2012 | Signed as free agent | Sean Green | — | Texas Rangers | Texas Rangers signed free agent RHP Sean Green to a minor league contract and invited him to spring training. |
| Jan 10, 2012 | Signed as free agent | Niuman Romero | — | Detroit Tigers | Detroit Tigers signed free agent 2B Niuman Romero to a minor league contract. |
| Jan 10, 2012 | Signed as free agent | Seth McClung | — | Milwaukee Brewers | Milwaukee Brewers signed free agent RHP Seth McClung to a minor league contract. |
| Jan 10, 2012 | Signed as free agent | Brad Thompson | — | Minnesota Twins | Minnesota Twins signed free agent RHP Brad Thompson to a minor league contract. |
| Jan 10, 2012 | Signed as free agent | Austin Bibens-Dirkx | — | Washington Nationals | Washington Nationals signed free agent RHP Austin Bibens-Dirkx to a minor league contract and invited him to spring training. |
| Jan 9, 2012 | Signed as free agent | Darren Oliver | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Darren Oliver. |
| Jan 9, 2012 | Signed as free agent | Chris Seddon | — | Cleveland Guardians | Cleveland Indians signed free agent Chris Seddon. |
| Jan 9, 2012 | Signed as free agent | Brooks Conrad | — | Milwaukee Brewers | Milwaukee Brewers signed free agent 2B Brooks Conrad to a minor league contract and invited him to spring training. |
| Jan 9, 2012 | Signed as free agent | Preston Mattingly | — | New York Yankees | New York Yankees signed free agent Preston Mattingly. |
| Jan 9, 2012 | Signed as free agent | Chin-Lung Hu | — | Cleveland Guardians | Cleveland Indians signed free agent SS Chin-lung Hu to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Jimmy Barthmaier | — | Washington Nationals | Washington Nationals signed free agent RHP Jimmy Barthmaier to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Francis Beltran | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Francis Beltran to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Allan de San Miguel | — | Baltimore Orioles | Baltimore Orioles signed free agent C Allan de San Miguel to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Rafael Vera | — | Cincinnati Reds | Cincinnati Reds signed free agent 1B Rafael Vera to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Drew Macias | — | Los Angeles Angels | Los Angeles Angels signed free agent CF Drew Macias to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Rodrigo Lopez | — | Chicago Cubs | Chicago Cubs signed free agent RHP Rodrigo Lopez to a minor league contract and invited him to spring training. |
| Jan 9, 2012 | Signed as free agent | Justin Germano | — | Boston Red Sox | Boston Red Sox signed free agent RHP Justin Germano to a minor league contract and invited him to spring training. |
| Jan 9, 2012 | Signed as free agent | Kyler Newby | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Kyler Newby to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Miguel Acevedo | — | Washington Nationals | Washington Nationals signed free agent RHP Miguel Acevedo to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Younaifred Aguero | — | Washington Nationals | Washington Nationals signed free agent 3B Younaifred Aguero to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Jonathan Aquino | — | Washington Nationals | Washington Nationals signed free agent RHP Jonathan Aquino to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Juan Arias | — | Washington Nationals | Washington Nationals signed free agent SS Juan Arias to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Miguel Atencio | — | Washington Nationals | Washington Nationals signed free agent OF Miguel Atencio to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Rafael Bautista | — | Washington Nationals | Washington Nationals signed free agent OF Rafael Bautista to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Jorge Berrio | — | Washington Nationals | Washington Nationals signed free agent RHP Jorge Berrio to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Kevin Cerda | — | Washington Nationals | Washington Nationals signed free agent 3B Kevin Cerda to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Elisaul Gomez | — | Washington Nationals | Washington Nationals signed free agent LHP Elisaul Gomez to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Andres Martinez | — | Washington Nationals | Washington Nationals signed free agent SS Andres Martinez to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Jefry Rodriguez | — | Washington Nationals | Washington Nationals signed free agent RHP Jefry Rodriguez to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Melvi Salazar | — | Washington Nationals | Washington Nationals signed free agent RHP Melvi Salazar to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Brayan Serrata | — | Washington Nationals | Washington Nationals signed free agent C Brayan Serrata to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Wester Suarez | — | Washington Nationals | Washington Nationals signed free agent 1B Wester Suarez to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Starlyn Suriel | — | Washington Nationals | Washington Nationals signed free agent RHP Starlyn Suriel to a minor league contract. |
| Jan 9, 2012 | Signed as free agent | Anderson Pichardo | — | Texas Rangers | Texas Rangers signed free agent RHP Anderson Pichardo to a minor league contract. |
| Jan 8, 2012 | Signed as free agent | Jesus Morales | — | Philadelphia Phillies | Philadelphia Phillies signed free agent RHP Jesus Morales to a minor league contract. |
| Jan 8, 2012 | Signed as free agent | Ryan Rowland-Smith | — | Chicago Cubs | Chicago Cubs signed free agent LHP Ryan Rowland-Smith to a minor league contract. |
| Jan 7, 2012 | Signed as free agent | Pedro Arias | — | Minnesota Twins | Minnesota Twins signed free agent RHP Pedro Arias to a minor league contract. |
| Jan 6, 2012 | Trade | Kyung-Min Na | Chicago Cubs | San Diego Padres | Chicago Cubs traded RHP Andrew Cashner and LF Kyung-Min Na to San Diego Padres for 1B Anthony Rizzo and RHP Zach Cates. |
| Jan 6, 2012 | Signed as free agent | Leonard Davis | — | Colorado Rockies | Colorado Rockies signed free agent LF Leonard Davis to a minor league contract. |
| Jan 6, 2012 | Signed as free agent | Brandon Roberts | — | Colorado Rockies | Colorado Rockies signed free agent CF Brandon Roberts to a minor league contract. |
| Jan 6, 2012 | Signed as free agent | Doug Deeds | — | Los Angeles Angels | Los Angeles Angels signed free agent RF Doug Deeds to a minor league contract and invited him to spring training. |
| Jan 6, 2012 | Signed as free agent | Hideki Okajima | — | New York Yankees | New York Yankees signed free agent LHP Hideki Okajima to a minor league contract and invited him to spring training. |
| Jan 6, 2012 | Signed as free agent | Ricardo Nanita | — | Toronto Blue Jays | Toronto Blue Jays signed free agent OF Ricardo Nanita to a minor league contract and invited him to spring training. |
| Jan 6, 2012 | Signed as free agent | Devin Ivany | — | Washington Nationals | Washington Nationals signed free agent C Devin Ivany to a minor league contract. |
| Jan 6, 2012 | Signed as free agent | Tug Hulett | — | Philadelphia Phillies | Philadelphia Phillies signed free agent 3B Tug Hulett to a minor league contract. |
| Jan 6, 2012 | Signed as free agent | Jimmy Cordero | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Jimmy Cordero to a minor league contract. |
| Jan 5, 2012 | Trade | Carlos Zambrano | Chicago Cubs | Miami Marlins | Chicago Cubs traded RHP Carlos Zambrano to Miami Marlins for RHP Chris Volstad. |
| Jan 5, 2012 | Signed as free agent | Greg Dobbs | — | Miami Marlins | Miami Marlins signed free agent 1B Greg Dobbs. |
| Jan 5, 2012 | Signed as free agent | Mike MacDougal | — | Los Angeles Dodgers | Los Angeles Dodgers signed free agent RHP Mike MacDougal. |
| Jan 5, 2012 | Signed as free agent | Coco Crisp | — | Athletics | Oakland Athletics signed free agent Coco Crisp. |
| Jan 5, 2012 | Signed as free agent | Casey Blake | — | Colorado Rockies | Colorado Rockies signed free agent 3B Casey Blake. |
| Jan 5, 2012 | Trade | Greg Reynolds | Colorado Rockies | Texas Rangers | Colorado Rockies traded RHP Greg Reynolds to Texas Rangers for 1B Chad Tracy. |
| Jan 5, 2012 | Signed as free agent | Hisashi Iwakuma | — | Seattle Mariners | Seattle Mariners signed free agent RHP Hisashi Iwakuma. |
| Jan 5, 2012 | Signed as free agent | James Skelton | — | Washington Nationals | Washington Nationals signed free agent C James Skelton to a minor league contract. |
| Jan 5, 2012 | Signed as free agent | Ross Wolf | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Ross Wolf to a minor league contract. |
| Jan 5, 2012 | Signed as free agent | Vince Bongiovanni | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Vince Bongiovanni to a minor league contract. |
| Jan 5, 2012 | Signed as free agent | Juan Apodaca | — | Chicago Cubs | Chicago Cubs signed free agent C Juan Apodaca to a minor league contract. |
| Jan 5, 2012 | Signed as free agent | John Holdzkom | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP John Holdzkom to a minor league contract. |
| Jan 5, 2012 | Signed as free agent | Hector Corpas | — | Houston Astros | Houston Astros signed free agent RHP Hector Corpas to a minor league contract. |
| Jan 5, 2012 | Signed as free agent | José Manuel Fernández | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Jose Fernandez to a minor league contract. |
| Jan 5, 2012 | Signed as free agent | Jose Casilla | — | San Francisco Giants | San Francisco Giants signed free agent RHP Jose Casilla to a minor league contract. |
| Jan 4, 2012 | Signed as free agent | Logan Kensing | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent RHP Logan Kensing to a minor league contract and invited him to spring training. |
| Jan 4, 2012 | Signed as free agent | Jo-Jo Reyes | — | Pittsburgh Pirates | Pittsburgh Pirates signed free agent LHP Jo-Jo Reyes to a minor league contract and invited him to spring training. |
| Jan 4, 2012 | Signed as free agent | Andrew Brackman | — | Cincinnati Reds | Cincinnati Reds signed free agent Andrew Brackman. |
| Jan 4, 2012 | Signed as free agent | Fernando Rodney | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Fernando Rodney. |
| Jan 4, 2012 | Signed as free agent | Willie Eyre | — | Baltimore Orioles | Baltimore Orioles signed free agent RHP Willie Eyre to a minor league contract and invited him to spring training. |
| Jan 4, 2012 | Signed as free agent | Luis Jimenez | — | Seattle Mariners | Seattle Mariners signed free agent DH Luis Jimenez to a minor league contract and invited him to spring training. |
| Jan 4, 2012 | Signed as free agent | Jean Duque | — | Cincinnati Reds | Cincinnati Reds signed free agent RHP Jean Duque to a minor league contract. |
| Jan 4, 2012 | Signed as free agent | Alberto Paulino | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Alberto Paulino to a minor league contract. |
| Jan 4, 2012 | Signed as free agent | Matt Ramsey | — | Tampa Bay Rays | Tampa Bay Rays signed free agent RHP Matt Ramsey to a minor league contract. |
| Jan 3, 2012 | Signed as free agent | Omar Quintanilla | — | New York Mets | New York Mets signed free agent SS Omar Quintanilla to a minor league contract and invited him to spring training. |
| Jan 3, 2012 | Signed as free agent | Robinson Tejeda | — | Cleveland Guardians | Cleveland Indians signed free agent RHP Robinson Tejeda to a minor league contract and invited him to spring training. |
| Jan 3, 2012 | Signed as free agent | Pedro Ciriaco | — | Boston Red Sox | Boston Red Sox signed free agent SS Pedro Ciriaco to a minor league contract and invited him to spring training. |
| Jan 3, 2012 | Trade | Jai Miller | Athletics | Baltimore Orioles | Oakland Athletics traded CF Jai Miller to Baltimore Orioles. |
| Jan 3, 2012 | Trade | Brandon Snyder | Baltimore Orioles | Texas Rangers | Baltimore Orioles traded 1B Brandon Snyder to Texas Rangers. |
| Jan 3, 2012 | Signed as free agent | Carlos Silva | — | Boston Red Sox | Boston Red Sox signed free agent RHP Carlos Silva to a minor league contract and invited him to spring training. |
| Jan 3, 2012 | Signed as free agent | Chorye Spoone | — | Boston Red Sox | Boston Red Sox signed free agent RHP Chorye Spoone to a minor league contract and invited him to spring training. |
| Jan 3, 2012 | Signed as free agent | Sean Burroughs | — | Minnesota Twins | Minnesota Twins signed free agent 3B Sean Burroughs to a minor league contract and invited him to spring training. |
| Jan 3, 2012 | Signed as free agent | Casey Fien | — | Minnesota Twins | Minnesota Twins signed free agent RHP Casey Fien to a minor league contract and invited him to spring training. |
| Jan 3, 2012 | Signed as free agent | Steve Pearce | — | Minnesota Twins | Minnesota Twins signed free agent 1B Steve Pearce to a minor league contract and invited him to spring training. |
| Jan 3, 2012 | Signed as free agent | J.R. Towles | — | Minnesota Twins | Minnesota Twins signed free agent C J.R. Towles to a minor league contract and invited him to spring training. |
| Jan 3, 2012 | Signed as free agent | Reed Johnson | — | Chicago Cubs | Chicago Cubs signed free agent Reed Johnson. |
| Jan 3, 2012 | Signed as free agent | Bobby O'Neill | — | Miami Marlins | Miami Marlins signed free agent Bobby O'Neill. |
| Jan 3, 2012 | Signed as free agent | Miguel Fermin | — | Miami Marlins | Miami Marlins signed free agent RHP Miguel Fermin to a minor league contract. |
| Jan 3, 2012 | Signed as free agent | Yordany Ramirez | — | San Diego Padres | San Diego Padres signed free agent OF Yordany Ramirez to a minor league contract. |
| Jan 3, 2012 | Signed as free agent | Hector Gimenez | — | Chicago White Sox | Chicago White Sox signed free agent C Hector Gimenez to a minor league contract and invited him to spring training. |
| Jan 3, 2012 | Signed as free agent | Kevin Moscatel | — | Milwaukee Brewers | Milwaukee Brewers signed free agent C Kevin Moscatel to a minor league contract. |
| Jan 2, 2012 | Signed as free agent | Adam Heether | — | Los Angeles Angels | Los Angeles Angels signed free agent 3B Adam Heether to a minor league contract. |
| Jan 2, 2012 | Signed as free agent | Pablo Ceballos | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent C Pablo Ceballos to a minor league contract. |
| Jan 2, 2012 | Signed as free agent | Aldahir Cordoba | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent OF Aldahir Cordoba to a minor league contract. |
| Jan 2, 2012 | Signed as free agent | Pablo Morales | — | Arizona Diamondbacks | Arizona Diamondbacks signed free agent RHP Pablo Morales to a minor league contract. |
| Jan 1, 2012 | Trade | Jason Frasor | Chicago White Sox | Toronto Blue Jays | Chicago White Sox Traded RHP Jason Frasor to Toronto Blue Jays; Lansing Lugnuts Traded RHP Daniel Webb to Winston-Salem Dash and Bluefield Blue Jays Traded RHP Myles Jaye to Bristol White Sox. |
| Jan 1, 2012 | Signed as free agent | Wilmin Lara | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Wilmin Lara to a minor league contract. |
| Jan 1, 2012 | Signed as free agent | Francis Eduardo | — | Toronto Blue Jays | Toronto Blue Jays signed free agent RHP Francis Eduardo to a minor league contract. |
| Jan 1, 2012 | Signed as free agent | Oscar Cabrera | — | Toronto Blue Jays | Toronto Blue Jays signed free agent LHP Oscar Cabrera to a minor league contract. |
Every row is captured from MLB’s official StatsAPI transactions feed with MLB’s published description unedited. Signings include both major-league and minor-league contracts signed with a major-league club; injury-list moves and minor-league affiliate-only transactions are outside this archive’s scope.
Transaction data: official MLB StatsAPI. Data provided by MLB Advanced Media. Archived and published by Legends Deck.