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The 2003 season’s official transaction log: 1,418 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 31, 2003 | Signed as free agent | Jake Robbins | — | Cleveland Indians | Free agent signing |
| Dec 30, 2003 | Signed as free agent | Todd Dunwoody | — | Chicago Cubs | Free agent signing |
| Dec 30, 2003 | Signed as free agent | Jason Johnson | — | Detroit Tigers | Free agent signing |
| Dec 30, 2003 | Signed as free agent | Mark Quinn | — | St. Louis Cardinals | Free agent signing |
| Dec 29, 2003 | Signed as free agent | Damion Easley | — | Florida Marlins | Free agent signing |
| Dec 29, 2003 | Signed as free agent | Chad Mottola | — | Baltimore Orioles | Free agent signing |
| Dec 29, 2003 | Signed as free agent | Bob Smith | — | Chicago White Sox | Free agent signing |
| Dec 29, 2003 | Signed as free agent | Jamey Wright | — | Chicago Cubs | Free agent signing |
| Dec 28, 2003 | Signed as free agent | Jeff Farnsworth | — | Montreal Expos | Free agent signing |
| Dec 28, 2003 | Signed as free agent | Mark Johnson | — | Los Angeles Dodgers | Free agent signing |
| Dec 27, 2003 | Signed as free agent | Valerio De Los Santos | — | Toronto Blue Jays | Free agent signing |
| Dec 27, 2003 | Signed as free agent | Jose Nunez | — | Seattle Mariners | Free agent signing |
| Dec 27, 2003 | Signed as free agent | Bill Selby | — | Chicago Cubs | Free agent signing |
| Dec 26, 2003 | Signed as free agent | Andy Abad | — | Pittsburgh Pirates | Free agent signing |
| Dec 26, 2003 | Signed as free agent | Ronnie Belliard | — | Cleveland Indians | Free agent signing |
| Dec 26, 2003 | Signed as free agent | Jeremy Fikac | — | Montreal Expos | Free agent signing |
| Dec 26, 2003 | Signed as free agent | Frank Menechino | — | Oakland Athletics | Free agent signing |
| Dec 25, 2003 | Signed as free agent | Matt Duff | — | St. Louis Cardinals | Free agent signing |
| Dec 24, 2003 | Signed as free agent | Luis Ortiz | — | St. Louis Cardinals | Free agent signing |
| Dec 24, 2003 | Signed as free agent | Jason Tyner | — | Texas Rangers | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Antonio Alfonseca | — | Atlanta Braves | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Mike Bacsik | — | Texas Rangers | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Napoleon Calzado | — | Baltimore Orioles | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Mike Cameron | — | New York Mets | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Buddy Carlyle | — | New York Yankees | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Jermaine Clark | — | Cincinnati Reds | Free agent signing |
| Dec 23, 2003 | Signed as free agent | David Dellucci | — | Texas Rangers | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Eddy Garabito | — | Baltimore Orioles | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Ben Grieve | — | Milwaukee Brewers | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Miguel Ojeda | — | San Diego Padres | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Pokey Reese | — | Boston Red Sox | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Arthur Rhodes | — | Oakland Athletics | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Todd Sears | — | San Diego Padres | Free agent signing |
| Dec 23, 2003 | Signed as free agent | Shawn Wooten | — | Philadelphia Phillies | Free agent signing |
| Dec 23, 2003 | Trade | Bill Murphy | Oakland Athletics | Florida Marlins | Trade |
| Dec 22, 2003 | Signed as free agent | Armando Almanza | — | Atlanta Braves | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Edwin Almonte | — | Boston Red Sox | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Gary Bennett | — | Milwaukee Brewers | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Matt Erickson | — | Milwaukee Brewers | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Lee Gardner | — | San Francisco Giants | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Todd Greene | — | Colorado Rockies | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Michael Jackson | — | Chicago White Sox | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Gabe Kapler | — | Boston Red Sox | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Augie Ojeda | — | Minnesota Twins | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Jose Santiago | — | Chicago White Sox | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Jason Shiell | — | Boston Red Sox | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Scott Strickland | — | New York Mets | Free agent signing |
| Dec 22, 2003 | Signed as free agent | Jeff Tam | — | Colorado Rockies | Free agent signing |
| Dec 21, 2003 | Signed as free agent | Michael Barrett | — | Chicago Cubs | Free agent signing |
| Dec 21, 2003 | Signed as free agent | Pedro Feliciano | — | New York Mets | Free agent signing |
| Dec 21, 2003 | Signed as free agent | Julius Matos | — | Montreal Expos | Free agent signing |
| Dec 21, 2003 | Signed as free agent | Mark Redman | — | Oakland Athletics | Free agent signing |
| Dec 20, 2003 | Signed as free agent | Homer Bush | — | New York Yankees | Free agent signing |
| Dec 20, 2003 | Signed as free agent | McKay Christensen | — | Cincinnati Reds | Free agent signing |
| Dec 20, 2003 | Signed as free agent | Joe Depastino | — | Atlanta Braves | Free agent signing |
| Dec 20, 2003 | Signed as free agent | Seth Etherton | — | Cincinnati Reds | Free agent signing |
| Dec 20, 2003 | Signed as free agent | Jose Guillen | — | Anaheim Angels | Free agent signing |
| Dec 20, 2003 | Signed as free agent | Mike Judd | — | Montreal Expos | Free agent signing |
| Dec 20, 2003 | Signed as free agent | Mike Moriarty | — | Colorado Rockies | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Miguel Cairo | — | New York Yankees | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Carl Everett | — | Montreal Expos | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Sterling Hitchcock | — | San Diego Padres | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Javier Martinez | — | Baltimore Orioles | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Kent Mercker | — | Chicago Cubs | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Eddie Perez | — | Atlanta Braves | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Matt Perisho | — | Florida Marlins | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Adam Piatt | — | Cleveland Indians | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Rey Sanchez | — | Tampa Bay Devil Rays | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Reggie Sanders | — | St. Louis Cardinals | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Gary Sheffield | — | New York Yankees | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Scott Spiezio | — | Seattle Mariners | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Kelly Stinnett | — | Kansas City Royals | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Tanyon Sturtze | — | Los Angeles Dodgers | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Brian Tollberg | — | Colorado Rockies | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Fernando Vina | — | Detroit Tigers | Free agent signing |
| Dec 19, 2003 | Signed as free agent | Rondell White | — | Detroit Tigers | Free agent signing |
| Dec 19, 2003 | Trade | Brett Price | Oakland Athletics | Montreal Expos | Trade |
| Dec 19, 2003 | Trade | Jose Macias | Montreal Expos | Chicago Cubs | Trade |
| Dec 19, 2003 | Trade | Wilton Chavez | Chicago Cubs | Montreal Expos | Trade |
| Dec 18, 2003 | Signed as free agent | Wilson Alvarez | — | Los Angeles Dodgers | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Miguel Batista | — | Toronto Blue Jays | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Henry Blanco | — | Minnesota Twins | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Mike Difelice | — | Detroit Tigers | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Tony Fiore | — | Houston Astros | Free agent signing |
| Dec 18, 2003 | Signed as free agent | John Franco | — | New York Mets | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Brad Fullmer | — | Texas Rangers | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Wilton Guerrero | — | Kansas City Royals | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Roberto Hernandez | — | Philadelphia Phillies | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Todd Hollandsworth | — | Chicago Cubs | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Delvin James | — | Florida Marlins | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Brett Jodie | — | Boston Red Sox | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Jalal Leach | — | Chicago Cubs | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Al Levine | — | Detroit Tigers | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Rich Loiselle | — | Tampa Bay Devil Rays | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Brent Mayne | — | Arizona Diamondbacks | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Jeff Suppan | — | St. Louis Cardinals | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Miguel Tejada | — | Baltimore Orioles | Free agent signing |
| Dec 18, 2003 | Signed as free agent | Ismael Valdez | — | San Diego Padres | Free agent signing |
| Dec 18, 2003 | Trade | Unnamed | New York Yankees | Oakland Athletics | $ |
| Dec 18, 2003 | Trade | Chris Hammond | New York Yankees | Oakland Athletics | Trade |
| Dec 18, 2003 | Trade | Eduardo Sierra | Oakland Athletics | New York Yankees | Trade |
| Dec 18, 2003 | Trade | J.T. Stotts | Oakland Athletics | New York Yankees | Trade |
| Dec 17, 2003 | Signed as free agent | Jose Cruz | — | Tampa Bay Devil Rays | Free agent signing |
| Dec 17, 2003 | Signed as free agent | Agustin Montero | — | Los Angeles Dodgers | Free agent signing |
| Dec 17, 2003 | Signed as free agent | Mike Porzio | — | Cleveland Indians | Free agent signing |
| Dec 17, 2003 | Signed as free agent | Paul Quantrill | — | New York Yankees | Free agent signing |
| Dec 17, 2003 | Signed as free agent | Ricardo Rincon | — | Oakland Athletics | Free agent signing |
| Dec 17, 2003 | Trade | Bobby Korecky | Philadelphia Phillies | Minnesota Twins | Trade |
| Dec 17, 2003 | Trade | J.T. Thomas | San Francisco Giants | Minnesota Twins | Trade |
| Dec 16, 2003 | Signed as free agent | Tom Gordon | — | New York Yankees | Free agent signing |
| Dec 16, 2003 | Signed as free agent | Tony Graffanino | — | Kansas City Royals | Free agent signing |
| Dec 16, 2003 | Signed as free agent | Eddie Guardado | — | Seattle Mariners | Free agent signing |
| Dec 16, 2003 | Signed as free agent | Dave McCarty | — | Boston Red Sox | Free agent signing |
| Dec 16, 2003 | Signed as free agent | Andy Pettitte | — | Houston Astros | Free agent signing |
| Dec 16, 2003 | Signed as free agent | Rob Stanifer | — | Tampa Bay Devil Rays | Free agent signing |
| Dec 16, 2003 | Trade | John-Paul Davis | Tampa Bay Devil Rays | St. Louis Cardinals | Trade |
| Dec 16, 2003 | Trade | Javier Vazquez | Montreal Expos | New York Yankees | Trade |
| Dec 16, 2003 | Trade | Nick Johnson | New York Yankees | Montreal Expos | Trade |
| Dec 16, 2003 | Trade | Juan Rivera | New York Yankees | Montreal Expos | Trade |
| Dec 16, 2003 | Trade | Randy Choate | New York Yankees | Montreal Expos | Trade |
| Dec 16, 2003 | Trade | Mark Redman | Florida Marlins | Oakland Athletics | Trade |
| Dec 16, 2003 | Trade | Michael Neu | Oakland Athletics | Florida Marlins | Trade |
| Dec 15, 2003 | Signed as free agent | Pat Borders | — | Seattle Mariners | Free agent signing |
| Dec 15, 2003 | Signed as free agent | Ryan Christenson | — | Florida Marlins | Free agent signing |
| Dec 15, 2003 | Signed as free agent | John Flaherty | — | New York Yankees | Free agent signing |
| Dec 15, 2003 | Signed as free agent | Phil Hiatt | — | Houston Astros | Free agent signing |
| Dec 15, 2003 | Signed as free agent | Rick Short | — | Kansas City Royals | Free agent signing |
| Dec 15, 2003 | Trade | Dave Gassner | Toronto Blue Jays | Minnesota Twins | Trade |
| Dec 15, 2003 | Trade | Noochie Varner | Milwaukee Brewers | Arizona Diamondbacks | Trade |
| Dec 15, 2003 | Trade | Sandy Nin | Toronto Blue Jays | Colorado Rockies | Trade |
| Dec 15, 2003 | Trade | Chris Buglovsky | Colorado Rockies | Seattle Mariners | Trade |
| Dec 15, 2003 | Trade | Allan Simpson | Seattle Mariners | Colorado Rockies | Trade |
| Dec 15, 2003 | Trade | Unnamed | Seattle Mariners | Arizona Diamondbacks | $ |
| Dec 15, 2003 | Trade | Greg Colbrunn | Seattle Mariners | Arizona Diamondbacks | Trade |
| Dec 15, 2003 | Trade | Quinton McCracken | Arizona Diamondbacks | Seattle Mariners | Trade |
| Dec 15, 2003 | Trade | Unnamed | Kansas City Royals | San Diego Padres | $ |
| Dec 15, 2003 | Trade | Jason Szuminski | Kansas City Royals | San Diego Padres | Trade |
| Dec 15, 2003 | Trade | Rich Thompson | San Diego Padres | Kansas City Royals | Trade |
| Dec 15, 2003 | Trade | Dustan Mohr | Minnesota Twins | San Francisco Giants | Trade |
| Dec 15, 2003 | Trade | Michael Barrett | Montreal Expos | Oakland Athletics | Trade |
| Dec 15, 2003 | Trade | Unnamed | Chicago Cubs | Oakland Athletics | $ |
| Dec 15, 2003 | Trade | Damian Miller | Chicago Cubs | Oakland Athletics | Trade |
| Dec 15, 2003 | Trade | Michael Barrett | Oakland Athletics | Chicago Cubs | Trade |
| Dec 14, 2003 | Released | Luke Allen | Colorado Rockies | — | Release |
| Dec 14, 2003 | Signed as free agent | Pedro Borbon | — | San Diego Padres | Free agent signing |
| Dec 14, 2003 | Released | Pablo Ozuna | Colorado Rockies | — | Release |
| Dec 14, 2003 | Trade | Joe Kennedy | Tampa Bay Devil Rays | Colorado Rockies | Trade |
| Dec 14, 2003 | Trade | Justin Speier | Colorado Rockies | Toronto Blue Jays | Trade |
| Dec 14, 2003 | Trade | Mark Hendrickson | Toronto Blue Jays | Tampa Bay Devil Rays | Trade |
| Dec 14, 2003 | Trade | Geoff Blum | Houston Astros | Tampa Bay Devil Rays | Trade |
| Dec 14, 2003 | Trade | Brandon Backe | Tampa Bay Devil Rays | Houston Astros | Trade |
| Dec 13, 2003 | Signed as free agent | Rigo Beltran | — | Cincinnati Reds | Free agent signing |
| Dec 13, 2003 | Signed as free agent | Keith McDonald | — | Pittsburgh Pirates | Free agent signing |
| Dec 13, 2003 | Trade | Juan Encarnacion | Florida Marlins | Los Angeles Dodgers | Trade |
| Dec 13, 2003 | Trade | Travis Ezi | Los Angeles Dodgers | Florida Marlins | Trade |
| Dec 13, 2003 | Trade | Unnamed | New York Yankees | Los Angeles Dodgers | $ |
| Dec 13, 2003 | Trade | Jeff Weaver | New York Yankees | Los Angeles Dodgers | Trade |
| Dec 13, 2003 | Trade | Brandon Weeden | New York Yankees | Los Angeles Dodgers | Trade |
| Dec 13, 2003 | Trade | Yhency Brazoban | New York Yankees | Los Angeles Dodgers | Trade |
| Dec 13, 2003 | Trade | Kevin Brown | Los Angeles Dodgers | New York Yankees | Trade |
| Dec 13, 2003 | Trade | J. D. Drew | St. Louis Cardinals | Atlanta Braves | Trade |
| Dec 13, 2003 | Trade | Eli Marrero | St. Louis Cardinals | Atlanta Braves | Trade |
| Dec 13, 2003 | Trade | Jason Marquis | Atlanta Braves | St. Louis Cardinals | Trade |
| Dec 13, 2003 | Trade | Ray King | Atlanta Braves | St. Louis Cardinals | Trade |
| Dec 13, 2003 | Trade | Adam Wainwright | Atlanta Braves | St. Louis Cardinals | Trade |
| Dec 12, 2003 | Signed as free agent | Brian Bowles | — | Milwaukee Brewers | Free agent signing |
| Dec 11, 2003 | Signed as free agent | Vinny Castilla | — | Colorado Rockies | Free agent signing |
| Dec 11, 2003 | Signed as free agent | David Cortes | — | Detroit Tigers | Free agent signing |
| Dec 11, 2003 | Released | Donaldo Mendez | San Diego Padres | — | Release |
| Dec 11, 2003 | Signed as free agent | Doug Nickle | — | Los Angeles Dodgers | Free agent signing |
| Dec 11, 2003 | Signed as free agent | Eduardo Perez | — | Tampa Bay Devil Rays | Free agent signing |
| Dec 11, 2003 | Signed as free agent | Benito Santiago | — | Kansas City Royals | Free agent signing |
| Dec 10, 2003 | Signed as free agent | Bartolo Colon | — | Anaheim Angels | Free agent signing |
| Dec 10, 2003 | Released | Brian Daubach | Chicago White Sox | — | Release |
| Dec 10, 2003 | Signed as free agent | Gary Glover | — | Chicago Cubs | Free agent signing |
| Dec 10, 2003 | Signed as free agent | Joey Hamilton | — | San Diego Padres | Free agent signing |
| Dec 10, 2003 | Signed as free agent | Kazuo Matsui | — | New York Mets | Free agent signing with first major-league team |
| Dec 10, 2003 | Signed as free agent | Jon Nunnally | — | Milwaukee Brewers | Free agent signing |
| Dec 10, 2003 | Signed as free agent | John Thomson | — | Atlanta Braves | Free agent signing |
| Dec 10, 2003 | Signed as free agent | Tim Worrell | — | Philadelphia Phillies | Free agent signing |
| Dec 9, 2003 | Signed as free agent | Brent Butler | — | St. Louis Cardinals | Free agent signing |
| Dec 9, 2003 | Signed as free agent | Kerry Ligtenberg | — | Toronto Blue Jays | Free agent signing |
| Dec 9, 2003 | Signed | Jhonny Nunez | — | Los Angeles Dodgers | Amateur free agent signing |
| Dec 9, 2003 | Signed as free agent | Akinori Otsuka | — | San Diego Padres | Free agent signing with first major-league team |
| Dec 9, 2003 | Signed as free agent | Jason Smith | — | Detroit Tigers | Free agent signing |
| Dec 9, 2003 | Signed as free agent | Matt Stairs | — | Kansas City Royals | Free agent signing |
| Dec 9, 2003 | Signed as free agent | Scott Sullivan | — | Kansas City Royals | Free agent signing |
| Dec 8, 2003 | Signed as free agent | Travis Dawkins | — | Kansas City Royals | Free agent signing |
| Dec 8, 2003 | Signed as free agent | Francisco Santos | — | San Francisco Giants | Free agent signing |
| Dec 8, 2003 | Signed as free agent | Todd Van Poppel | — | Cincinnati Reds | Free agent signing |
| Dec 8, 2003 | Signed as free agent | Todd Williams | — | Texas Rangers | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Carlos Baerga | — | Arizona Diamondbacks | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Dave Burba | — | Milwaukee Brewers | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Luis Castillo | — | Florida Marlins | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Cal Eldred | — | St. Louis Cardinals | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Chad Fox | — | Florida Marlins | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Tom Goodwin | — | Chicago Cubs | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Jason Grimsley | — | Kansas City Royals | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Mark Grudzielanek | — | Chicago Cubs | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Shigetoshi Hasegawa | — | Seattle Mariners | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Steve Kline | — | St. Louis Cardinals | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Kevin Millwood | — | Philadelphia Phillies | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Todd Pratt | — | Philadelphia Phillies | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Steve Reed | — | Colorado Rockies | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Ruben Sierra | — | New York Yankees | Free agent signing |
| Dec 7, 2003 | Signed as free agent | J. T. Snow | — | San Francisco Giants | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Shannon Stewart | — | Minnesota Twins | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Marcus Thames | — | Detroit Tigers | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Michael Tucker | — | San Francisco Giants | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Robin Ventura | — | Los Angeles Dodgers | Free agent signing |
| Dec 7, 2003 | Signed as free agent | Gabe White | — | New York Yankees | Free agent signing |
| Dec 6, 2003 | Signed as free agent | Rod Beck | — | San Diego Padres | Free agent signing |
| Dec 6, 2003 | Signed as free agent | Gerald Williams | — | Florida Marlins | Free agent signing |
| Dec 5, 2003 | Signed as free agent | Juan Acevedo | — | Pittsburgh Pirates | Free agent signing |
| Dec 5, 2003 | Released | Mike Kinkade | Los Angeles Dodgers | — | Release |
| Dec 5, 2003 | Signed as free agent | Mike Mordecai | — | Florida Marlins | Free agent signing |
| Dec 4, 2003 | Signed as free agent | Robinson Cancel | — | Tampa Bay Devil Rays | Free agent signing |
| Dec 4, 2003 | Released | Raul Gonzalez | New York Mets | — | Release |
| Dec 4, 2003 | Signed as free agent | Mike Gulan | — | Chicago White Sox | Free agent signing |
| Dec 4, 2003 | Signed as free agent | Felix Heredia | — | New York Yankees | Free agent signing |
| Dec 4, 2003 | Signed as free agent | Felix Jose | — | Arizona Diamondbacks | Free agent signing |
| Dec 4, 2003 | Signed as free agent | Marc Kroon | — | Colorado Rockies | Free agent signing |
| Dec 4, 2003 | Signed as free agent | Matt Treanor | — | Florida Marlins | Free agent signing |
| Dec 4, 2003 | Signed as free agent | Chris Widger | — | St. Louis Cardinals | Free agent signing |
| Dec 3, 2003 | Signed as free agent | Jason Conti | — | Texas Rangers | Free agent signing |
| Dec 3, 2003 | Signed as free agent | Chris Gissell | — | San Francisco Giants | Free agent signing |
| Dec 3, 2003 | Signed as free agent | Wayne Gomes | — | Oakland Athletics | Free agent signing |
| Dec 3, 2003 | Signed as free agent | Jeffrey Hammonds | — | San Francisco Giants | Free agent signing |
| Dec 3, 2003 | Signed as free agent | Bill Haselman | — | Baltimore Orioles | Free agent signing |
| Dec 3, 2003 | Signed as free agent | LaTroy Hawkins | — | Chicago Cubs | Free agent signing |
| Dec 3, 2003 | Signed as free agent | Mark Johnson | — | Milwaukee Brewers | Free agent signing |
| Dec 3, 2003 | Trade | Eric Milton | Minnesota Twins | Philadelphia Phillies | Trade |
| Dec 3, 2003 | Trade | Carlos Silva | Philadelphia Phillies | Minnesota Twins | Trade |
| Dec 3, 2003 | Trade | Nick Punto | Philadelphia Phillies | Minnesota Twins | Trade |
| Dec 2, 2003 | Signed as free agent | Chris Carpenter | — | St. Louis Cardinals | Free agent signing |
| Dec 2, 2003 | Signed as free agent | Dustin Hermanson | — | San Francisco Giants | Free agent signing |
| Dec 2, 2003 | Signed as free agent | Scott McClain | — | Chicago Cubs | Free agent signing |
| Dec 2, 2003 | Signed as free agent | Dennys Reyes | — | Kansas City Royals | Free agent signing |
| Dec 2, 2003 | Signed as free agent | Joe Roa | — | Minnesota Twins | Free agent signing |
| Dec 2, 2003 | Signed as free agent | Scott Sanders | — | Florida Marlins | Free agent signing |
| Dec 2, 2003 | Signed as free agent | Victor Santos | — | Milwaukee Brewers | Free agent signing |
| Dec 2, 2003 | Signed as free agent | Mark Smith | — | Philadelphia Phillies | Free agent signing |
| Dec 2, 2003 | Trade | Juan Uribe | Colorado Rockies | Chicago White Sox | Trade |
| Dec 2, 2003 | Trade | Aaron Miles | Chicago White Sox | Colorado Rockies | Trade |
| Dec 1, 2003 | Signed as free agent | Brian Anderson | — | Kansas City Royals | Free agent signing |
| Dec 1, 2003 | Signed as free agent | Chris Fussell | — | Pittsburgh Pirates | Free agent signing |
| Dec 1, 2003 | Signed as free agent | Curt Leskanic | — | Kansas City Royals | Free agent signing |
| Dec 1, 2003 | Signed as free agent | Joe Randa | — | Kansas City Royals | Free agent signing |
| Dec 1, 2003 | Signed as free agent | Ernie Young | — | Cleveland Indians | Free agent signing |
| Dec 1, 2003 | Trade | Junior Spivey | Arizona Diamondbacks | Milwaukee Brewers | Trade |
| Dec 1, 2003 | Trade | Craig Counsell | Arizona Diamondbacks | Milwaukee Brewers | Trade |
| Dec 1, 2003 | Trade | Lyle Overbay | Arizona Diamondbacks | Milwaukee Brewers | Trade |
| Dec 1, 2003 | Trade | Chad Moeller | Arizona Diamondbacks | Milwaukee Brewers | Trade |
| Dec 1, 2003 | Trade | Chris Capuano | Arizona Diamondbacks | Milwaukee Brewers | Trade |
| Dec 1, 2003 | Trade | Jorge De La Rosa | Arizona Diamondbacks | Milwaukee Brewers | Trade |
| Dec 1, 2003 | Trade | Richie Sexson | Milwaukee Brewers | Arizona Diamondbacks | Trade |
| Dec 1, 2003 | Trade | Shane Nance | Milwaukee Brewers | Arizona Diamondbacks | Trade |
| Nov 30, 2003 | Signed as free agent | Alex Delgado | — | Milwaukee Brewers | Free agent signing |
| Nov 29, 2003 | Signed as free agent | Jesse Orosco | — | Arizona Diamondbacks | Free agent signing |
| Nov 28, 2003 | Trade | Casey Fossum | Boston Red Sox | Arizona Diamondbacks | Trade |
| Nov 28, 2003 | Trade | Brandon Lyon | Boston Red Sox | Arizona Diamondbacks | Trade |
| Nov 28, 2003 | Trade | Jorge De La Rosa | Boston Red Sox | Arizona Diamondbacks | Trade |
| Nov 28, 2003 | Trade | Mike Goss | Boston Red Sox | Arizona Diamondbacks | Trade |
| Nov 28, 2003 | Trade | Curt Schilling | Arizona Diamondbacks | Boston Red Sox | Trade |
| Nov 26, 2003 | Signed as free agent | Chad Allen | — | Texas Rangers | Free agent signing |
| Nov 26, 2003 | Signed as free agent | Sandy Alomar | — | Chicago White Sox | Free agent signing |
| Nov 26, 2003 | Signed as free agent | Andy Barkett | — | Detroit Tigers | Free agent signing |
| Nov 26, 2003 | Signed as free agent | Bruce Chen | — | Toronto Blue Jays | Free agent signing |
| Nov 26, 2003 | Signed as free agent | Tomas de la Rosa | — | Pittsburgh Pirates | Free agent signing |
| Nov 26, 2003 | Signed as free agent | Aaron Holbert | — | Cincinnati Reds | Free agent signing |
| Nov 26, 2003 | Signed as free agent | Ryan Kohlmeier | — | Chicago White Sox | Free agent signing |
| Nov 26, 2003 | Signed as free agent | Fernando Lunar | — | Chicago Cubs | Free agent signing |
| Nov 26, 2003 | Signed as free agent | Chris Magruder | — | Milwaukee Brewers | Free agent signing |
| Nov 26, 2003 | Signed as free agent | Peter Munro | — | Minnesota Twins | Free agent signing |
| Nov 26, 2003 | Signed as free agent | Kevin Pickford | — | San Francisco Giants | Free agent signing |
| Nov 26, 2003 | Signed as free agent | Corey Thurman | — | Cincinnati Reds | Free agent signing |
| Nov 26, 2003 | Trade | Terrence Long | Oakland Athletics | San Diego Padres | Trade |
| Nov 26, 2003 | Trade | Ramon Hernandez | Oakland Athletics | San Diego Padres | Trade |
| Nov 26, 2003 | Trade | Mark Kotsay | San Diego Padres | Oakland Athletics | Trade |
| Nov 25, 2003 | Signed as free agent | Brandon Berger | — | Kansas City Royals | Free agent signing |
| Nov 25, 2003 | Signed | Carlos Carrasco | — | Philadelphia Phillies | Amateur free agent signing |
| Nov 25, 2003 | Signed as free agent | Raul Casanova | — | Baltimore Orioles | Free agent signing |
| Nov 25, 2003 | Signed as free agent | Bryce Florie | — | Florida Marlins | Free agent signing |
| Nov 25, 2003 | Signed as free agent | Alex Hernandez | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 25, 2003 | Signed as free agent | Brian Hunter | — | San Diego Padres | Free agent signing |
| Nov 25, 2003 | Signed as free agent | Travis Smith | — | Atlanta Braves | Free agent signing |
| Nov 25, 2003 | Signed as free agent | Tyler Walker | — | San Francisco Giants | Free agent signing |
| Nov 25, 2003 | Trade | Derrek Lee | Florida Marlins | Chicago Cubs | Trade |
| Nov 25, 2003 | Trade | Hee-Seop Choi | Chicago Cubs | Florida Marlins | Trade |
| Nov 25, 2003 | Trade | Mike Nannini | Chicago Cubs | Florida Marlins | Trade |
| Nov 24, 2003 | Signed as free agent | Dave Borkowski | — | Baltimore Orioles | Free agent signing |
| Nov 24, 2003 | Signed as free agent | Cedrick Bowers | — | Florida Marlins | Free agent signing |
| Nov 24, 2003 | Signed as free agent | Giovanni Carrara | — | Cleveland Indians | Free agent signing |
| Nov 24, 2003 | Signed as free agent | Kelvim Escobar | — | Anaheim Angels | Free agent signing |
| Nov 24, 2003 | Signed as free agent | Andy Fox | — | Texas Rangers | Free agent signing |
| Nov 24, 2003 | Signed as free agent | Nathan Haynes | — | San Francisco Giants | Free agent signing |
| Nov 24, 2003 | Signed as free agent | Chad Paronto | — | St. Louis Cardinals | Free agent signing |
| Nov 24, 2003 | Signed as free agent | Ariel Prieto | — | Detroit Tigers | Free agent signing |
| Nov 24, 2003 | Signed as free agent | Scott Wiggins | — | Milwaukee Brewers | Free agent signing |
| Nov 21, 2003 | Signed as free agent | Kevin Appier | — | Kansas City Royals | Free agent signing |
| Nov 21, 2003 | Signed as free agent | Brian Cooper | — | San Francisco Giants | Free agent signing |
| Nov 21, 2003 | Signed | Greg Halman | — | Minnesota Twins | Amateur free agent signing |
| Nov 21, 2003 | Signed as free agent | Chris Heintz | — | Minnesota Twins | Free agent signing |
| Nov 21, 2003 | Signed as free agent | Mike Venafro | — | Kansas City Royals | Free agent signing |
| Nov 21, 2003 | Trade | Tino Martinez | St. Louis Cardinals | Tampa Bay Devil Rays | Trade |
| Nov 21, 2003 | Trade | Evan Rust | Tampa Bay Devil Rays | St. Louis Cardinals | Trade |
| Nov 20, 2003 | Released | Ronnie Belliard | Colorado Rockies | — | Release |
| Nov 20, 2003 | Signed as free agent | Chris Clapinski | — | Cleveland Indians | Free agent signing |
| Nov 20, 2003 | Signed as free agent | Travis Driskill | — | Colorado Rockies | Free agent signing |
| Nov 20, 2003 | Signed as free agent | Jesus Feliciano | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 20, 2003 | Signed | Pedro Figueroa | — | Oakland Athletics | Amateur free agent signing |
| Nov 20, 2003 | Signed as free agent | Randy Flores | — | St. Louis Cardinals | Free agent signing |
| Nov 20, 2003 | Released | Chad Hermansen | Los Angeles Dodgers | — | Release |
| Nov 20, 2003 | Signed as free agent | John Lindsey | — | Seattle Mariners | Free agent signing |
| Nov 20, 2003 | Signed as free agent | Dave Maurer | — | Toronto Blue Jays | Free agent signing |
| Nov 20, 2003 | Released | Rodney Myers | Los Angeles Dodgers | — | Release |
| Nov 20, 2003 | Released | Adam Piatt | Tampa Bay Devil Rays | — | Release |
| Nov 20, 2003 | Signed as free agent | Donnie Sadler | — | Arizona Diamondbacks | Free agent signing |
| Nov 20, 2003 | Signed as free agent | Brian Schmack | — | Detroit Tigers | Free agent signing |
| Nov 19, 2003 | Signed as free agent | Brad Ausmus | — | Houston Astros | Free agent signing |
| Nov 19, 2003 | Signed as free agent | Edwards Guzman | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 19, 2003 | Signed as free agent | Tim Hamulack | — | Boston Red Sox | Free agent signing |
| Nov 19, 2003 | Signed as free agent | Ken Huckaby | — | Texas Rangers | Free agent signing |
| Nov 19, 2003 | Signed as free agent | Raul Ibanez | — | Seattle Mariners | Free agent signing |
| Nov 19, 2003 | Released | Brandon Puffer | Houston Astros | — | Release |
| Nov 19, 2003 | Released | Rodrigo Rosario | Houston Astros | — | Release |
| Nov 19, 2003 | Signed as free agent | Kevin Witt | — | St. Louis Cardinals | Free agent signing |
| Nov 19, 2003 | Signed as free agent | Jason Wood | — | Florida Marlins | Free agent signing |
| Nov 18, 2003 | Released | Tim Bogar | Colorado Rockies | — | Release |
| Nov 18, 2003 | Released | Jeremy Giambi | Boston Red Sox | — | Release |
| Nov 18, 2003 | Signed as free agent | Dicky Gonzalez | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 18, 2003 | Signed as free agent | Pat Hentgen | — | Toronto Blue Jays | Free agent signing |
| Nov 18, 2003 | Signed as free agent | Eric Knott | — | Los Angeles Dodgers | Free agent signing |
| Nov 18, 2003 | Released | Agustin Montero | Los Angeles Dodgers | — | Release |
| Nov 18, 2003 | Signed as free agent | C. J. Nitkowski | — | Atlanta Braves | Free agent signing |
| Nov 18, 2003 | Released | Kevin Tolar | Boston Red Sox | — | Release |
| Nov 18, 2003 | Signed as free agent | Jose Vizcaino | — | Houston Astros | Free agent signing |
| Nov 18, 2003 | Trade | Ted Lilly | Oakland Athletics | Toronto Blue Jays | Trade |
| Nov 18, 2003 | Trade | Bobby Kielty | Toronto Blue Jays | Oakland Athletics | Trade |
| Nov 17, 2003 | Released | Andy Abad | Boston Red Sox | — | Release |
| Nov 17, 2003 | Signed as free agent | Ramon Castro | — | Oakland Athletics | Free agent signing |
| Nov 17, 2003 | Signed as free agent | Mike Fyhrie | — | Florida Marlins | Free agent signing |
| Nov 17, 2003 | Signed as free agent | Carlos Maldonado | — | Chicago White Sox | Free agent signing |
| Nov 17, 2003 | Signed as free agent | Christian Parker | — | Montreal Expos | Free agent signing |
| Nov 17, 2003 | Signed as free agent | Ryan Rupe | — | Los Angeles Dodgers | Free agent signing |
| Nov 17, 2003 | Signed as free agent | Mike Timlin | — | Boston Red Sox | Free agent signing |
| Nov 16, 2003 | Signed as free agent | Trent Durrington | — | Milwaukee Brewers | Free agent signing |
| Nov 16, 2003 | Signed as free agent | Adam Pettyjohn | — | San Francisco Giants | Free agent signing |
| Nov 15, 2003 | Signed as free agent | Guillermo Rodriguez | — | Detroit Tigers | Free agent signing |
| Nov 14, 2003 | Signed as free agent | Paul Abbott | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 14, 2003 | Signed as free agent | John Halama | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 14, 2003 | Signed as free agent | Bart Miadich | — | San Diego Padres | Free agent signing |
| Nov 14, 2003 | Signed as free agent | Warren Morris | — | Detroit Tigers | Free agent signing |
| Nov 14, 2003 | Signed as free agent | Danny Sandoval | — | Philadelphia Phillies | Free agent signing |
| Nov 14, 2003 | Signed as free agent | Jorge Velandia | — | Atlanta Braves | Free agent signing |
| Nov 14, 2003 | Trade | Unnamed | Minnesota Twins | San Francisco Giants | $ |
| Nov 14, 2003 | Trade | A. J. Pierzynski | Minnesota Twins | San Francisco Giants | Trade |
| Nov 14, 2003 | Trade | Joe Nathan | San Francisco Giants | Minnesota Twins | Trade |
| Nov 14, 2003 | Trade | Francisco Liriano | San Francisco Giants | Minnesota Twins | Trade |
| Nov 14, 2003 | Trade | Boof Bonser | San Francisco Giants | Minnesota Twins | Trade |
| Nov 13, 2003 | Signed as free agent | Jason Bere | — | Cleveland Indians | Free agent signing |
| Nov 13, 2003 | Signed as free agent | Chris Coste | — | Milwaukee Brewers | Free agent signing |
| Nov 13, 2003 | Released | Russ Johnson | New York Mets | — | Release |
| Nov 13, 2003 | Signed as free agent | Mickey Lopez | — | Seattle Mariners | Free agent signing |
| Nov 13, 2003 | Signed as free agent | Tom Martin | — | Los Angeles Dodgers | Free agent signing |
| Nov 13, 2003 | Signed as free agent | Jim Rushford | — | Philadelphia Phillies | Free agent signing |
| Nov 12, 2003 | Signed as free agent | Mike Bell | — | Chicago White Sox | Free agent signing |
| Nov 12, 2003 | Signed as free agent | Bryan Corey | — | Chicago Cubs | Free agent signing |
| Nov 12, 2003 | Signed as free agent | Ryan Jackson | — | Atlanta Braves | Free agent signing |
| Nov 12, 2003 | Signed as free agent | Bobby Jones | — | Boston Red Sox | Free agent signing |
| Nov 12, 2003 | Signed as free agent | Dan Miceli | — | Houston Astros | Free agent signing |
| Nov 12, 2003 | Signed as free agent | Scott Sobkowiak | — | Cincinnati Reds | Free agent signing |
| Nov 11, 2003 | Signed as free agent | Felipe Crespo | — | Florida Marlins | Free agent signing |
| Nov 11, 2003 | Signed as free agent | Tim Harikkala | — | Colorado Rockies | Free agent signing |
| Nov 11, 2003 | Signed as free agent | Calvin Pickering | — | Kansas City Royals | Free agent signing |
| Nov 10, 2003 | Signed as free agent | Jason Alfaro | — | Houston Astros | Free agent signing |
| Nov 10, 2003 | Signed as free agent | John Barnes | — | Los Angeles Dodgers | Free agent signing |
| Nov 10, 2003 | Signed as free agent | Trace Coquillette | — | Boston Red Sox | Free agent signing |
| Nov 10, 2003 | Signed as free agent | Brian Falkenborg | — | Los Angeles Dodgers | Free agent signing |
| Nov 10, 2003 | Signed as free agent | Adam Hyzdu | — | Boston Red Sox | Free agent signing |
| Nov 10, 2003 | Signed as free agent | Bucky Jacobsen | — | Seattle Mariners | Free agent signing |
| Nov 10, 2003 | Signed as free agent | David Newhan | — | Texas Rangers | Free agent signing |
| Nov 10, 2003 | Signed as free agent | Lino Urdaneta | — | Cleveland Indians | Free agent signing |
| Nov 9, 2003 | Signed as free agent | Gene Kingsale | — | San Diego Padres | Free agent signing |
| Nov 7, 2003 | Released | Brent Abernathy | Kansas City Royals | — | Release |
| Nov 7, 2003 | Signed as free agent | Jeff Bailey | — | Boston Red Sox | Free agent signing |
| Nov 7, 2003 | Signed as free agent | Mike Coolbaugh | — | Houston Astros | Free agent signing |
| Nov 7, 2003 | Signed as free agent | Seth Greisinger | — | Minnesota Twins | Free agent signing |
| Nov 7, 2003 | Signed as free agent | Danny Klassen | — | Detroit Tigers | Free agent signing |
| Nov 7, 2003 | Signed as free agent | Mike Mahoney | — | St. Louis Cardinals | Free agent signing |
| Nov 7, 2003 | Signed as free agent | Alan Zinter | — | Arizona Diamondbacks | Free agent signing |
| Nov 6, 2003 | Signed as free agent | Alberto Castillo | — | San Francisco Giants | Free agent signing |
| Nov 6, 2003 | Signed as free agent | Jason Gilfillan | — | Colorado Rockies | Free agent signing |
| Nov 6, 2003 | Signed as free agent | Joe Horgan | — | St. Louis Cardinals | Free agent signing |
| Nov 6, 2003 | Signed as free agent | David Lee | — | Cleveland Indians | Free agent signing |
| Nov 6, 2003 | Trade | Chris White | Cleveland Indians | Kansas City Royals | Trade |
| Nov 5, 2003 | Signed as free agent | Brian Dallimore | — | San Francisco Giants | Free agent signing |
| Nov 5, 2003 | Released | Robert Fick | Atlanta Braves | — | Release |
| Nov 5, 2003 | Signed as free agent | Brian Gordon | — | Anaheim Angels | Free agent signing |
| Nov 5, 2003 | Signed as free agent | Cody McKay | — | St. Louis Cardinals | Free agent signing |
| Nov 5, 2003 | Released | Scott Randall | Cincinnati Reds | — | Release |
| Nov 5, 2003 | Signed as free agent | Dusty Wathan | — | Cleveland Indians | Free agent signing |
| Nov 4, 2003 | Signed as free agent | Mark Budzinski | — | Philadelphia Phillies | Free agent signing |
| Nov 4, 2003 | Released | Ryan Dempster | Cincinnati Reds | — | Release |
| Nov 3, 2003 | Signed as free agent | Allen Levrault | — | St. Louis Cardinals | Free agent signing |
| Nov 3, 2003 | Signed as free agent | Jason Maxwell | — | Tampa Bay Devil Rays | Free agent signing |
| Nov 3, 2003 | Signed as free agent | Tim Young | — | Cleveland Indians | Free agent signing |
| Nov 3, 2003 | Trade | Billy Wagner | Houston Astros | Philadelphia Phillies | Trade |
| Nov 3, 2003 | Trade | Brandon Duckworth | Philadelphia Phillies | Houston Astros | Trade |
| Nov 3, 2003 | Trade | Taylor Buchholz | Philadelphia Phillies | Houston Astros | Trade |
| Nov 3, 2003 | Trade | Ezequiel Astacio | Philadelphia Phillies | Houston Astros | Trade |
| Nov 1, 2003 | Signed as free agent | Tim Christman | — | Detroit Tigers | Free agent signing |
| Oct 31, 2003 | Signed as free agent | Eric Cammack | — | Oakland Athletics | Free agent signing |
| Oct 31, 2003 | Signed | Waldis Joaquin | — | San Francisco Giants | Amateur free agent signing |
| Oct 31, 2003 | Signed as free agent | Willie Morales | — | Colorado Rockies | Free agent signing |
| Oct 31, 2003 | Released | Josh Paul | Chicago Cubs | — | Release |
| Oct 31, 2003 | Signed as free agent | Erik Sabel | — | Texas Rangers | Free agent signing |
| Oct 31, 2003 | Signed as free agent | Mark Wohlers | — | Cleveland Indians | Free agent signing |
| Oct 30, 2003 | Signed as free agent | Carlos Almanzar | — | Texas Rangers | Free agent signing |
| Oct 30, 2003 | Released | Stubby Clapp | Atlanta Braves | — | Release |
| Oct 30, 2003 | Released | Will Ohman | Chicago Cubs | — | Release |
| Oct 29, 2003 | Signed as free agent | Shawn Camp | — | Kansas City Royals | Free agent signing |
| Oct 29, 2003 | Signed as free agent | Joey Dawley | — | Kansas City Royals | Free agent signing |
| Oct 29, 2003 | Signed as free agent | Kelly Dransfeldt | — | Chicago White Sox | Free agent signing |
| Oct 29, 2003 | Signed as free agent | Jason Roach | — | New York Mets | Free agent signing |
| Oct 28, 2003 | Signed as free agent | Yamid Haad | — | San Diego Padres | Free agent signing |
| Oct 28, 2003 | Signed as free agent | Travis Phelps | — | Milwaukee Brewers | Free agent signing |
| Oct 28, 2003 | Released | Shane Reynolds | Atlanta Braves | — | Release |
| Oct 27, 2003 | Signed as free agent | Ken Cloude | — | Tampa Bay Devil Rays | Free agent signing |
| Oct 27, 2003 | Signed as free agent | Adam Riggs | — | Anaheim Angels | Free agent signing |
| Oct 27, 2003 | Released | Terry Shumpert | Tampa Bay Devil Rays | — | Release |
| Oct 27, 2003 | Released | Luis Sojo | New York Yankees | — | Release |
| Oct 26, 2003 | Signed as free agent | Bobby Chouinard | — | Houston Astros | Free agent signing |
| Oct 26, 2003 | Released | Horacio Estrada | Minnesota Twins | — | Release |
| Oct 25, 2003 | Signed as free agent | Dewayne Wise | — | Atlanta Braves | Free agent signing |
| Oct 24, 2003 | Released | Bob Howry | Boston Red Sox | — | Release |
| Oct 24, 2003 | Signed as free agent | Masao Kida | — | Los Angeles Dodgers | Free agent signing |
| Oct 22, 2003 | Signed as free agent | John Wasdin | — | Texas Rangers | Free agent signing |
| Oct 21, 2003 | Signed as free agent | Kirk Bullinger | — | Houston Astros | Free agent signing |
| Oct 21, 2003 | Released | Chris Singleton | Oakland Athletics | — | Release |
| Oct 17, 2003 | Signed as free agent | Pedro Swann | — | Baltimore Orioles | Free agent signing |
| Oct 15, 2003 | Released | Sean Bergman | Florida Marlins | — | Release |
| Oct 15, 2003 | Released | Brad Fullmer | Anaheim Angels | — | Release |
| Oct 15, 2003 | Signed as free agent | David Manning | — | Florida Marlins | Free agent signing |
| Oct 15, 2003 | Released | Rudy Seanez | Chicago Cubs | — | Release |
| Oct 15, 2003 | Released | Ed Yarnall | Oakland Athletics | — | Release |
| Oct 13, 2003 | Released | Micah Bowie | Oakland Athletics | — | Release |
| Oct 13, 2003 | Signed | Anthony Ortega | — | Anaheim Angels | Amateur free agent signing |
| Oct 9, 2003 | Released | Robert Ellis | Texas Rangers | — | Release |
| Oct 8, 2003 | Released | Doug Creek | Toronto Blue Jays | — | Release |
| Oct 8, 2003 | Released | Tony Mounce | Texas Rangers | — | Release |
| Oct 7, 2003 | Released | Bubba Trammell | New York Yankees | — | Release |
| Oct 6, 2003 | Released | Dave Elder | Cleveland Indians | — | Release |
| Oct 6, 2003 | Released | Matt Wise | Anaheim Angels | — | Release |
| Oct 2, 2003 | Released | Jeff D'Amico | Pittsburgh Pirates | — | Release |
| Oct 2, 2003 | Trade | Cory Stewart | San Diego Padres | Pittsburgh Pirates | Trade |
| Oct 1, 2003 | Released | Jose Hernandez | Pittsburgh Pirates | — | Release |
| Sep 30, 2003 | Signed | Rhiner Cruz | — | Detroit Tigers | Amateur free agent signing |
| Sep 29, 2003 | Released | Keith Lockhart | San Diego Padres | — | Release |
| Sep 29, 2003 | Released | C. J. Nitkowski | Texas Rangers | — | Release |
| Sep 21, 2003 | Signed | Luis Durango | — | San Diego Padres | Amateur free agent signing |
| Sep 12, 2003 | Released | Jim Parque | Tampa Bay Devil Rays | — | Release |
| Sep 10, 2003 | Released | Jose Paniagua | Chicago White Sox | — | Release |
| Sep 10, 2003 | Signed as free agent | Tom Shearn | — | Cincinnati Reds | Free agent signing |
| Sep 10, 2003 | Trade | Mike Crudale | St. Louis Cardinals | Milwaukee Brewers | Trade |
| Sep 10, 2003 | Trade | John Novinsky | St. Louis Cardinals | Milwaukee Brewers | Trade |
| Sep 9, 2003 | Released | Pedro Borbon | St. Louis Cardinals | — | Release |
| Sep 9, 2003 | Trade | Todd Sears | Minnesota Twins | San Diego Padres | Trade |
| Sep 9, 2003 | Trade | Alex Garcia | San Diego Padres | Minnesota Twins | Trade |
| Sep 7, 2003 | Released | Tyler Houston | Philadelphia Phillies | — | Release |
| Sep 6, 2003 | Trade | David Lee | Los Angeles Dodgers | Cleveland Indians | Trade |
| Sep 6, 2003 | Trade | Alex Requena | Cleveland Indians | Los Angeles Dodgers | Trade |
| Sep 5, 2003 | Released | Jeff Tam | Toronto Blue Jays | — | Release |
| Sep 4, 2003 | Released | Sean Lowe | Kansas City Royals | — | Release |
| Sep 4, 2003 | Released | Doug Nickle | Chicago White Sox | — | Release |
| Sep 2, 2003 | Released | Frank Castillo | Atlanta Braves | — | Release |
| Sep 2, 2003 | Signed as free agent | Jose Mercedes | — | Montreal Expos | Free agent signing |
| Sep 2, 2003 | Trade | Juan Padilla | Minnesota Twins | New York Yankees | Trade |
| Aug 31, 2003 | Signed as free agent | Steve Sparks | — | Oakland Athletics | Free agent signing |
| Aug 31, 2003 | Trade | Jeff Conine | Baltimore Orioles | Florida Marlins | Trade |
| Aug 31, 2003 | Trade | Denny Bautista | Florida Marlins | Baltimore Orioles | Trade |
| Aug 31, 2003 | Trade | Don Levinski | Florida Marlins | Baltimore Orioles | Trade |
| Aug 31, 2003 | Trade | Jesse Orosco | New York Yankees | Minnesota Twins | Trade |
| Aug 31, 2003 | Trade | Kelly Stinnett | Cincinnati Reds | Philadelphia Phillies | Trade |
| Aug 31, 2003 | Trade | Eric Valent | Philadelphia Phillies | Cincinnati Reds | Trade |
| Aug 29, 2003 | Released | Mike Venafro | Houston Astros | — | Release |
| Aug 28, 2003 | Trade | Lou Merloni | San Diego Padres | Boston Red Sox | Trade |
| Aug 28, 2003 | Trade | Rene Miniel | Boston Red Sox | San Diego Padres | Trade |
| Aug 27, 2003 | Released | Steve Sparks | Detroit Tigers | — | Release |
| Aug 27, 2003 | Trade | Mike DeJean | Milwaukee Brewers | St. Louis Cardinals | Trade |
| Aug 26, 2003 | Signed as free agent | Gregg Zaun | — | Colorado Rockies | Free agent signing |
| Aug 26, 2003 | Trade | Jason Bay | San Diego Padres | Pittsburgh Pirates | Trade |
| Aug 26, 2003 | Trade | Oliver Perez | San Diego Padres | Pittsburgh Pirates | Trade |
| Aug 26, 2003 | Trade | Brian Giles | Pittsburgh Pirates | San Diego Padres | Trade |
| Aug 26, 2003 | Trade | Rondell White | San Diego Padres | Kansas City Royals | Trade |
| Aug 26, 2003 | Trade | Chris Tierney | Kansas City Royals | San Diego Padres | Trade |
| Aug 26, 2003 | Trade | Brian Sanches | Kansas City Royals | San Diego Padres | Trade |
| Aug 25, 2003 | Trade | Phil Norton | Chicago Cubs | Cincinnati Reds | Trade |
| Aug 25, 2003 | Trade | John Koronka | Cincinnati Reds | Chicago Cubs | Trade |
| Aug 25, 2003 | Trade | Unnamed | Kansas City Royals | Cleveland Indians | $ |
| Aug 25, 2003 | Trade | Trey Dyson | Kansas City Royals | Cleveland Indians | Trade |
| Aug 25, 2003 | Trade | Kieran Mattison | Kansas City Royals | Cleveland Indians | Trade |
| Aug 25, 2003 | Trade | Brian Anderson | Cleveland Indians | Kansas City Royals | Trade |
| Aug 24, 2003 | Signed as free agent | Benji Gil | — | Cleveland Indians | Free agent signing |
| Aug 24, 2003 | Signed as free agent | Scott Service | — | Cincinnati Reds | Free agent signing |
| Aug 23, 2003 | Released | Esteban Yan | St. Louis Cardinals | — | Release |
| Aug 22, 2003 | Signed as free agent | Rick Helling | — | Florida Marlins | Free agent signing |
| Aug 22, 2003 | Released | Ken Vining | Houston Astros | — | Release |
| Aug 22, 2003 | Trade | Sterling Hitchcock | New York Yankees | St. Louis Cardinals | Trade |
| Aug 22, 2003 | Trade | Justin Pope | St. Louis Cardinals | New York Yankees | Trade |
| Aug 22, 2003 | Trade | Ben Julianel | St. Louis Cardinals | New York Yankees | Trade |
| Aug 21, 2003 | Released | Jimmy Anderson | San Francisco Giants | — | Release |
| Aug 21, 2003 | Released | Gregg Zaun | Houston Astros | — | Release |
| Aug 21, 2003 | Trade | Unnamed | Chicago White Sox | Cincinnati Reds | $ |
| Aug 21, 2003 | Trade | Tim Hummel | Chicago White Sox | Cincinnati Reds | Trade |
| Aug 21, 2003 | Trade | Scott Sullivan | Cincinnati Reds | Chicago White Sox | Trade |
| Aug 20, 2003 | Signed | Jamie Hoffmann | — | Los Angeles Dodgers | Amateur free agent signing |
| Aug 20, 2003 | Signed as free agent | Todd Zeile | — | Montreal Expos | Free agent signing |
| Aug 19, 2003 | Released | Matt Blank | Atlanta Braves | — | Release |
| Aug 19, 2003 | Released | Kory DeHaan | San Diego Padres | — | Release |
| Aug 19, 2003 | Signed as free agent | Mike Fyhrie | — | Florida Marlins | Free agent signing |
| Aug 19, 2003 | Released | David Manning | Milwaukee Brewers | — | Release |
| Aug 19, 2003 | Trade | Tony Womack | Colorado Rockies | Chicago Cubs | Trade |
| Aug 19, 2003 | Trade | Emmanuel Ramirez | Chicago Cubs | Colorado Rockies | Trade |
| Aug 19, 2003 | Trade | Eric Young | Milwaukee Brewers | San Francisco Giants | Trade |
| Aug 19, 2003 | Trade | Greg Bruso | San Francisco Giants | Milwaukee Brewers | Trade |
| Aug 18, 2003 | Released | Benji Gil | Anaheim Angels | — | Release |
| Aug 18, 2003 | Released | Rick Helling | Baltimore Orioles | — | Release |
| Aug 18, 2003 | Released | Mario Valdez | San Diego Padres | — | Release |
| Aug 18, 2003 | Released | Chris Wakeland | Cleveland Indians | — | Release |
| Aug 18, 2003 | Released | Todd Zeile | New York Yankees | — | Release |
| Aug 17, 2003 | Released | Mike Fyhrie | Kansas City Royals | — | Release |
| Aug 17, 2003 | Trade | Tyler Pelland | Boston Red Sox | Cincinnati Reds | Trade |
| Aug 17, 2003 | Trade | Randall Simon | Pittsburgh Pirates | Chicago Cubs | Trade |
| Aug 17, 2003 | Trade | Ray Sadler | Chicago Cubs | Pittsburgh Pirates | Trade |
| Aug 16, 2003 | Signed as free agent | Frank Castillo | — | Atlanta Braves | Free agent signing |
| Aug 16, 2003 | Released | Fernando Lunar | Kansas City Royals | — | Release |
| Aug 15, 2003 | Trade | Bobby Hill | Chicago Cubs | Pittsburgh Pirates | Trade |
| Aug 14, 2003 | Released | Kane Davis | Chicago Cubs | — | Release |
| Aug 14, 2003 | Released | Calvin Murray | Los Angeles Dodgers | — | Release |
| Aug 14, 2003 | Signed as free agent | Rick White | — | Houston Astros | Free agent signing |
| Aug 14, 2003 | Trade | Matt Belisle | Atlanta Braves | Cincinnati Reds | Trade |
| Aug 12, 2003 | Signed | Jeremy Accardo | — | San Francisco Giants | Amateur free agent signing |
| Aug 12, 2003 | Trade | Kent Mercker | Cincinnati Reds | Atlanta Braves | Trade |
| Aug 11, 2003 | Signed as free agent | Lenny Harris | — | Florida Marlins | Free agent signing |
| Aug 11, 2003 | Signed | Shane Lindsay | — | Colorado Rockies | Amateur free agent signing |
| Aug 11, 2003 | Released | Rick White | Chicago White Sox | — | Release |
| Aug 10, 2003 | Signed as free agent | Mitch Meluskey | — | Houston Astros | Free agent signing |
| Aug 10, 2003 | Released | Scott Service | Toronto Blue Jays | — | Release |
| Aug 9, 2003 | Released | Juan Acevedo | Toronto Blue Jays | — | Release |
| Aug 8, 2003 | Signed as free agent | Chad Fox | — | Florida Marlins | Free agent signing |
| Aug 8, 2003 | Released | Jose Silva | Chicago Cubs | — | Release |
| Aug 8, 2003 | Trade | Paul Abbott | Arizona Diamondbacks | Kansas City Royals | Trade |
| Aug 8, 2003 | Trade | Aric LeClair | Kansas City Royals | Arizona Diamondbacks | Trade |
| Aug 7, 2003 | Signed as free agent | Mickey Callaway | — | Texas Rangers | Free agent signing |
| Aug 7, 2003 | Signed as free agent | Anthony Sanders | — | Toronto Blue Jays | Free agent signing |
| Aug 6, 2003 | Signed as free agent | Kevin Appier | — | Kansas City Royals | Free agent signing |
| Aug 6, 2003 | Signed as free agent | Raul Casanova | — | Baltimore Orioles | Free agent signing |
| Aug 6, 2003 | Released | Tony McKnight | Los Angeles Dodgers | — | Release |
| Aug 6, 2003 | Trade | Armando Benitez | New York Yankees | Seattle Mariners | Trade |
| Aug 6, 2003 | Trade | Jeff Nelson | Seattle Mariners | New York Yankees | Trade |
| Aug 4, 2003 | Released | Mike Duvall | Minnesota Twins | — | Release |
| Aug 4, 2003 | Signed as free agent | Derrin Ebert | — | Milwaukee Brewers | Free agent signing |
| Aug 3, 2003 | Signed as free agent | Matt Blank | — | Atlanta Braves | Free agent signing |
| Aug 2, 2003 | Released | Lenny Harris | Chicago Cubs | — | Release |
| Aug 2, 2003 | Signed as free agent | Pascual Matos | — | Colorado Rockies | Free agent signing |
| Aug 2, 2003 | Signed as free agent | Rudy Seanez | — | Chicago Cubs | Free agent signing |
| Aug 1, 2003 | Released | Kurt Abbott | St. Louis Cardinals | — | Release |
| Aug 1, 2003 | Released | Clayton Andrews | Cincinnati Reds | — | Release |
| Aug 1, 2003 | Released | Kevin Brown | St. Louis Cardinals | — | Release |
| Jul 31, 2003 | Released | Ryan Minor | Los Angeles Dodgers | — | Release |
| Jul 31, 2003 | Trade | Kurt Ainsworth | San Francisco Giants | Baltimore Orioles | Trade |
| Jul 31, 2003 | Trade | Damian Moss | San Francisco Giants | Baltimore Orioles | Trade |
| Jul 31, 2003 | Trade | Ryan Hannaman | San Francisco Giants | Baltimore Orioles | Trade |
| Jul 31, 2003 | Trade | Sidney Ponson | Baltimore Orioles | San Francisco Giants | Trade |
| Jul 31, 2003 | Trade | Unnamed | New York Yankees | Cincinnati Reds | $ |
| Jul 31, 2003 | Trade | Brandon Claussen | New York Yankees | Cincinnati Reds | Trade |
| Jul 31, 2003 | Trade | Charlie Manning | New York Yankees | Cincinnati Reds | Trade |
| Jul 31, 2003 | Trade | Aaron Boone | Cincinnati Reds | New York Yankees | Trade |
| Jul 31, 2003 | Trade | Robin Ventura | New York Yankees | Los Angeles Dodgers | Trade |
| Jul 31, 2003 | Trade | Bubba Crosby | Los Angeles Dodgers | New York Yankees | Trade |
| Jul 31, 2003 | Trade | Scott Proctor | Los Angeles Dodgers | New York Yankees | Trade |
| Jul 31, 2003 | Trade | Unnamed | Boston Red Sox | Pittsburgh Pirates | $ |
| Jul 31, 2003 | Trade | Mike Gonzalez | Boston Red Sox | Pittsburgh Pirates | Trade |
| Jul 31, 2003 | Trade | Freddy Sanchez | Boston Red Sox | Pittsburgh Pirates | Trade |
| Jul 31, 2003 | Trade | Brandon Lyon | Pittsburgh Pirates | Boston Red Sox | Trade |
| Jul 31, 2003 | Trade | Jeff Suppan | Pittsburgh Pirates | Boston Red Sox | Trade |
| Jul 31, 2003 | Trade | Anastacio Martinez | Pittsburgh Pirates | Boston Red Sox | Trade |
| Jul 30, 2003 | Released | Kevin Appier | Anaheim Angels | — | Release |
| Jul 30, 2003 | Released | Chad Fox | Boston Red Sox | — | Release |
| Jul 30, 2003 | Signed | Luis Perez | — | Toronto Blue Jays | Amateur free agent signing |
| Jul 30, 2003 | Trade | Unnamed | Chicago Cubs | Texas Rangers | $ |
| Jul 30, 2003 | Trade | Jason Fransz | Chicago Cubs | Texas Rangers | Trade |
| Jul 30, 2003 | Trade | Doug Glanville | Texas Rangers | Chicago Cubs | Trade |
| Jul 30, 2003 | Trade | Scott Schoeneweis | Anaheim Angels | Chicago White Sox | Trade |
| Jul 30, 2003 | Trade | Doug Nickle | Anaheim Angels | Chicago White Sox | Trade |
| Jul 30, 2003 | Trade | Gary Glover | Chicago White Sox | Anaheim Angels | Trade |
| Jul 30, 2003 | Trade | Scott Dunn | Chicago White Sox | Anaheim Angels | Trade |
| Jul 30, 2003 | Trade | Tim Bittner | Chicago White Sox | Anaheim Angels | Trade |
| Jul 30, 2003 | Trade | Jose Guillen | Cincinnati Reds | Oakland Athletics | Trade |
| Jul 30, 2003 | Trade | Aaron Harang | Oakland Athletics | Cincinnati Reds | Trade |
| Jul 30, 2003 | Trade | Joe Valentine | Oakland Athletics | Cincinnati Reds | Trade |
| Jul 30, 2003 | Trade | Jeff Bruksch | Oakland Athletics | Cincinnati Reds | Trade |
| Jul 30, 2003 | Trade | Scott Williamson | Cincinnati Reds | Boston Red Sox | Trade |
| Jul 30, 2003 | Trade | Phil Dumatrait | Boston Red Sox | Cincinnati Reds | Trade |
| Jul 29, 2003 | Signed as free agent | Manny Acosta | — | Atlanta Braves | Free agent signing |
| Jul 29, 2003 | Released | Mickey Callaway | Anaheim Angels | — | Release |
| Jul 29, 2003 | Signed as free agent | Matt Perisho | — | Colorado Rockies | Free agent signing |
| Jul 29, 2003 | Released | Rudy Seanez | Boston Red Sox | — | Release |
| Jul 29, 2003 | Trade | Unnamed | New York Mets | Seattle Mariners | $ |
| Jul 29, 2003 | Trade | Rey Sanchez | New York Mets | Seattle Mariners | Trade |
| Jul 29, 2003 | Trade | Kenny Kelly | Seattle Mariners | New York Mets | Trade |
| Jul 29, 2003 | Trade | Unnamed | New York Yankees | Arizona Diamondbacks | $ |
| Jul 29, 2003 | Trade | Raul Mondesi | New York Yankees | Arizona Diamondbacks | Trade |
| Jul 29, 2003 | Trade | David Dellucci | Arizona Diamondbacks | New York Yankees | Trade |
| Jul 29, 2003 | Trade | Bret Prinz | Arizona Diamondbacks | New York Yankees | Trade |
| Jul 29, 2003 | Trade | Jon-Mark Sprowl | Arizona Diamondbacks | New York Yankees | Trade |
| Jul 28, 2003 | Signed as free agent | Pedro Borbon | — | St. Louis Cardinals | Free agent signing |
| Jul 28, 2003 | Released | Raul Casanova | Tampa Bay Devil Rays | — | Release |
| Jul 28, 2003 | Signed as free agent | Vic Darensbourg | — | Montreal Expos | Free agent signing |
| Jul 28, 2003 | Released | Brian Hunter | Houston Astros | — | Release |
| Jul 28, 2003 | Trade | Jeremy Hill | Kansas City Royals | New York Mets | Trade |
| Jul 28, 2003 | Trade | Graeme Lloyd | New York Mets | Kansas City Royals | Trade |
| Jul 27, 2003 | Released | Matt Perisho | Arizona Diamondbacks | — | Release |
| Jul 25, 2003 | Signed as free agent | Brian Esposito | — | Anaheim Angels | Free agent signing |
| Jul 25, 2003 | Released | Alberto Reyes | New York Yankees | — | Release |
| Jul 25, 2003 | Signed as free agent | Sean Spencer | — | Baltimore Orioles | Free agent signing |
| Jul 25, 2003 | Trade | Frank Francisco | Chicago White Sox | Texas Rangers | Trade |
| Jul 25, 2003 | Trade | Josh Rupe | Chicago White Sox | Texas Rangers | Trade |
| Jul 25, 2003 | Trade | Anthony Webster | Chicago White Sox | Texas Rangers | Trade |
| Jul 24, 2003 | Released | Manny Acosta | New York Yankees | — | Release |
| Jul 24, 2003 | Released | Mark Quinn | San Diego Padres | — | Release |
| Jul 24, 2003 | Signed as free agent | Jose Silva | — | Chicago Cubs | Free agent signing |
| Jul 23, 2003 | Trade | Unnamed | Pittsburgh Pirates | Chicago Cubs | $ |
| Jul 23, 2003 | Trade | Aramis Ramirez | Pittsburgh Pirates | Chicago Cubs | Trade |
| Jul 23, 2003 | Trade | Kenny Lofton | Pittsburgh Pirates | Chicago Cubs | Trade |
| Jul 23, 2003 | Trade | Jose Hernandez | Chicago Cubs | Pittsburgh Pirates | Trade |
| Jul 23, 2003 | Trade | Matt Bruback | Chicago Cubs | Pittsburgh Pirates | Trade |
| Jul 22, 2003 | Signed | Argenis Diaz | — | Boston Red Sox | Amateur free agent signing |
| Jul 22, 2003 | Trade | Mike Gonzalez | Pittsburgh Pirates | Boston Red Sox | Trade |
| Jul 22, 2003 | Trade | Scott Sauerbeck | Pittsburgh Pirates | Boston Red Sox | Trade |
| Jul 22, 2003 | Trade | Brandon Lyon | Boston Red Sox | Pittsburgh Pirates | Trade |
| Jul 22, 2003 | Trade | Anastacio Martinez | Boston Red Sox | Pittsburgh Pirates | Trade |
| Jul 21, 2003 | Released | Ryan McGuire | New York Yankees | — | Release |
| Jul 21, 2003 | Signed as free agent | Ryan McGuire | — | Minnesota Twins | Free agent signing |
| Jul 21, 2003 | Signed as free agent | Tom Prince | — | Kansas City Royals | Free agent signing |
| Jul 21, 2003 | Released | Jose Silva | San Diego Padres | — | Release |
| Jul 21, 2003 | Trade | Unnamed | Pittsburgh Pirates | Philadelphia Phillies | $ |
| Jul 21, 2003 | Trade | Mike Williams | Pittsburgh Pirates | Philadelphia Phillies | Trade |
| Jul 21, 2003 | Trade | Frank Brooks | Philadelphia Phillies | Pittsburgh Pirates | Trade |
| Jul 19, 2003 | Released | Matt Blank | San Francisco Giants | — | Release |
| Jul 18, 2003 | Signed as free agent | Rontrez Johnson | — | Atlanta Braves | Free agent signing |
| Jul 18, 2003 | Released | Bo Porter | Atlanta Braves | — | Release |
| Jul 18, 2003 | Signed | Henry Rodriguez | — | Oakland Athletics | Amateur free agent signing |
| Jul 18, 2003 | Trade | Tony Womack | Arizona Diamondbacks | Colorado Rockies | Trade |
| Jul 18, 2003 | Trade | Mike Watson | Colorado Rockies | Arizona Diamondbacks | Trade |
| Jul 18, 2003 | Trade | Ryan Ludwick | Texas Rangers | Cleveland Indians | Trade |
| Jul 18, 2003 | Trade | Ricardo Rodriguez | Cleveland Indians | Texas Rangers | Trade |
| Jul 18, 2003 | Trade | Shane Spencer | Cleveland Indians | Texas Rangers | Trade |
| Jul 17, 2003 | Signed as free agent | Randy Keisler | — | Houston Astros | Free agent signing |
| Jul 17, 2003 | Signed as free agent | Allen Levrault | — | Florida Marlins | Free agent signing |
| Jul 17, 2003 | Signed as free agent | Wendell Magee | — | Colorado Rockies | Free agent signing |
| Jul 17, 2003 | Released | Anthony Sanders | Chicago White Sox | — | Release |
| Jul 16, 2003 | Released | Matt Beech | New York Yankees | — | Release |
| Jul 16, 2003 | Released | Tom Prince | Minnesota Twins | — | Release |
| Jul 16, 2003 | Signed | Ehren Wassermann | — | Chicago White Sox | Amateur free agent signing |
| Jul 16, 2003 | Trade | Bobby Kielty | Minnesota Twins | Toronto Blue Jays | Trade |
| Jul 16, 2003 | Trade | Shannon Stewart | Toronto Blue Jays | Minnesota Twins | Trade |
| Jul 16, 2003 | Trade | Jason Anderson | New York Yankees | New York Mets | Trade |
| Jul 16, 2003 | Trade | Ryan Bicondoa | New York Yankees | New York Mets | Trade |
| Jul 16, 2003 | Trade | Anderson Garcia | New York Yankees | New York Mets | Trade |
| Jul 16, 2003 | Trade | Armando Benitez | New York Mets | New York Yankees | Trade |
| Jul 14, 2003 | Signed as free agent | Doug Davis | — | Milwaukee Brewers | Free agent signing |
| Jul 14, 2003 | Released | Derrin Ebert | Arizona Diamondbacks | — | Release |
| Jul 14, 2003 | Signed as free agent | Rickey Henderson | — | Los Angeles Dodgers | Free agent signing |
| Jul 14, 2003 | Released | Rontrez Johnson | Texas Rangers | — | Release |
| Jul 14, 2003 | Released | Randy Keisler | Texas Rangers | — | Release |
| Jul 14, 2003 | Signed as free agent | Matt Perisho | — | Arizona Diamondbacks | Free agent signing |
| Jul 14, 2003 | Trade | Unnamed | New York Mets | Los Angeles Dodgers | $ |
| Jul 14, 2003 | Trade | Jeromy Burnitz | New York Mets | Los Angeles Dodgers | Trade |
| Jul 14, 2003 | Trade | Victor Diaz | Los Angeles Dodgers | New York Mets | Trade |
| Jul 14, 2003 | Trade | Jose Diaz | Los Angeles Dodgers | New York Mets | Trade |
| Jul 14, 2003 | Trade | Kole Strayhorn | Los Angeles Dodgers | New York Mets | Trade |
| Jul 13, 2003 | Signed as free agent | Chris Wakeland | — | Cleveland Indians | Free agent signing |
| Jul 13, 2003 | Trade | Adam Bernero | Detroit Tigers | Colorado Rockies | Trade |
| Jul 13, 2003 | Trade | Ben Petrick | Colorado Rockies | Detroit Tigers | Trade |
| Jul 13, 2003 | Trade | Unnamed | San Francisco Giants | San Diego Padres | $ |
| Jul 13, 2003 | Trade | Clay Hensley | San Francisco Giants | San Diego Padres | Trade |
| Jul 13, 2003 | Trade | Matt Herges | San Diego Padres | San Francisco Giants | Trade |
| Jul 11, 2003 | Signed as free agent | Dustin Hermanson | — | San Francisco Giants | Free agent signing |
| Jul 11, 2003 | Released | Wendell Magee | Detroit Tigers | — | Release |
| Jul 11, 2003 | Trade | Ugueth Urbina | Texas Rangers | Florida Marlins | Trade |
| Jul 11, 2003 | Trade | Adrian Gonzalez | Florida Marlins | Texas Rangers | Trade |
| Jul 11, 2003 | Trade | Will Smith | Florida Marlins | Texas Rangers | Trade |
| Jul 11, 2003 | Trade | Ryan Snare | Florida Marlins | Texas Rangers | Trade |
| Jul 10, 2003 | Signed as free agent | Hector Almonte | — | Montreal Expos | Free agent signing |
| Jul 10, 2003 | Released | Vic Darensbourg | Colorado Rockies | — | Release |
| Jul 10, 2003 | Signed | Esmil Rogers | — | Colorado Rockies | Amateur free agent signing |
| Jul 10, 2003 | Signed as free agent | Brian Simmons | — | Philadelphia Phillies | Free agent signing |
| Jul 10, 2003 | Signed as free agent | Mike Venafro | — | Houston Astros | Free agent signing |
| Jul 10, 2003 | Trade | Curt Leskanic | Milwaukee Brewers | Kansas City Royals | Trade |
| Jul 10, 2003 | Trade | Wes Obermueller | Kansas City Royals | Milwaukee Brewers | Trade |
| Jul 10, 2003 | Trade | Alejandro Machado | Kansas City Royals | Milwaukee Brewers | Trade |
| Jul 9, 2003 | Signed | Juan Abreu | — | Kansas City Royals | Amateur free agent signing |
| Jul 9, 2003 | Signed as free agent | Jimmy Anderson | — | San Francisco Giants | Free agent signing |
| Jul 9, 2003 | Released | Lorenzo Barcelo | San Francisco Giants | — | Release |
| Jul 9, 2003 | Signed as free agent | Mike Coolbaugh | — | Houston Astros | Free agent signing |
| Jul 9, 2003 | Signed | Alcides Escobar | — | Milwaukee Brewers | Amateur free agent signing |
| Jul 9, 2003 | Signed as free agent | Bobby Jones | — | Kansas City Royals | Free agent signing |
| Jul 9, 2003 | Released | Joe Winkelsas | Atlanta Braves | — | Release |
| Jul 9, 2003 | Trade | Aaron Myette | Cleveland Indians | Philadelphia Phillies | Trade |
| Jul 9, 2003 | Trade | Lyle Mouton | Philadelphia Phillies | Cleveland Indians | Trade |
| Jul 8, 2003 | Signed as free agent | Willie Banks | — | Chicago Cubs | Free agent signing |
| Jul 8, 2003 | Signed as free agent | Horacio Estrada | — | Minnesota Twins | Free agent signing |
| Jul 8, 2003 | Released | Mike Johnson | San Francisco Giants | — | Release |
| Jul 8, 2003 | Signed as free agent | Chris Piersoll | — | Baltimore Orioles | Free agent signing |
| Jul 8, 2003 | Trade | John Wasdin | Pittsburgh Pirates | Toronto Blue Jays | Trade |
| Jul 8, 2003 | Trade | Rich Thompson | Toronto Blue Jays | Pittsburgh Pirates | Trade |
| Jul 7, 2003 | Signed as free agent | Justin Kaye | — | Chicago Cubs | Free agent signing |
| Jul 6, 2003 | Trade | Travis Dawkins | Los Angeles Dodgers | Kansas City Royals | Trade |
| Jul 6, 2003 | Trade | Scott Mullen | Kansas City Royals | Los Angeles Dodgers | Trade |
| Jul 6, 2003 | Trade | Victor Rodriguez | Kansas City Royals | Los Angeles Dodgers | Trade |
| Jul 6, 2003 | Trade | D'Angelo Jimenez | Chicago White Sox | Cincinnati Reds | Trade |
| Jul 6, 2003 | Trade | Scott Dunn | Cincinnati Reds | Chicago White Sox | Trade |
| Jul 4, 2003 | Signed | Al Alburquerque | — | Chicago Cubs | Amateur free agent signing |
| Jul 4, 2003 | Signed as free agent | Josh Paul | — | Chicago Cubs | Free agent signing |
| Jul 4, 2003 | Signed as free agent | Joe Roa | — | Colorado Rockies | Free agent signing |
| Jul 3, 2003 | Released | Bobby Jones | Atlanta Braves | — | Release |
| Jul 3, 2003 | Signed as free agent | Ruben Rivera | — | Baltimore Orioles | Free agent signing |
| Jul 2, 2003 | Signed as free agent | Todd Jones | — | Boston Red Sox | Free agent signing |
| Jul 2, 2003 | Released | Justin Kaye | Boston Red Sox | — | Release |
| Jul 2, 2003 | Signed | Melky Mesa | — | New York Yankees | Amateur free agent signing |
| Jul 2, 2003 | Signed as free agent | Mike Moriarty | — | Houston Astros | Free agent signing |
| Jul 2, 2003 | Released | Chris Wakeland | Florida Marlins | — | Release |
| Jul 2, 2003 | Released | Ron Wright | Detroit Tigers | — | Release |
| Jul 1, 2003 | Signed as free agent | Todd Belitz | — | Tampa Bay Devil Rays | Free agent signing |
| Jul 1, 2003 | Signed as free agent | Will Cunnane | — | Atlanta Braves | Free agent signing |
| Jul 1, 2003 | Released | Jalal Leach | Seattle Mariners | — | Release |
| Jul 1, 2003 | Released | Matt Perisho | Tampa Bay Devil Rays | — | Release |
| Jul 1, 2003 | Trade | Unnamed | New York Mets | Chicago White Sox | $ |
| Jul 1, 2003 | Trade | Roberto Alomar | New York Mets | Chicago White Sox | Trade |
| Jul 1, 2003 | Trade | Edwin Almonte | Chicago White Sox | New York Mets | Trade |
| Jul 1, 2003 | Trade | Royce Ring | Chicago White Sox | New York Mets | Trade |
| Jul 1, 2003 | Trade | Andrew Salvo | Chicago White Sox | New York Mets | Trade |
| Jul 1, 2003 | Trade | Carl Everett | Texas Rangers | Chicago White Sox | Trade |
| Jun 30, 2003 | Released | Brian Esposito | Boston Red Sox | — | Release |
| Jun 30, 2003 | Released | Ryan Glynn | Atlanta Braves | — | Release |
| Jun 30, 2003 | Released | Todd Jones | Colorado Rockies | — | Release |
| Jun 30, 2003 | Released | Mike Venafro | Tampa Bay Devil Rays | — | Release |
| Jun 29, 2003 | Released | Matt Williams | Arizona Diamondbacks | — | Release |
| Jun 29, 2003 | Released | Kevin Young | Pittsburgh Pirates | — | Release |
| Jun 28, 2003 | Released | Willie Banks | New York Yankees | — | Release |
| Jun 28, 2003 | Signed as free agent | Jeffrey Hammonds | — | San Francisco Giants | Free agent signing |
| Jun 28, 2003 | Released | Jason Phillips | Cleveland Indians | — | Release |
| Jun 27, 2003 | Released | John Rocker | Tampa Bay Devil Rays | — | Release |
| Jun 26, 2003 | Released | Dustin Hermanson | St. Louis Cardinals | — | Release |
| Jun 26, 2003 | Trade | Kevin Joseph | St. Louis Cardinals | Montreal Expos | Trade |
| Jun 26, 2003 | Trade | Pat Collins | Montreal Expos | St. Louis Cardinals | Trade |
| Jun 25, 2003 | Signed as free agent | Cory Doyne | — | San Diego Padres | Free agent signing |
| Jun 24, 2003 | Released | Kevin Barker | Florida Marlins | — | Release |
| Jun 24, 2003 | Released | Jorge Fabregas | Tampa Bay Devil Rays | — | Release |
| Jun 24, 2003 | Signed as free agent | Craig House | — | Florida Marlins | Free agent signing |
| Jun 24, 2003 | Signed as free agent | Lyle Mouton | — | Philadelphia Phillies | Free agent signing |
| Jun 23, 2003 | Signed as free agent | Kelly Dransfeldt | — | Boston Red Sox | Free agent signing |
| Jun 23, 2003 | Trade | Jason Perry | Toronto Blue Jays | Oakland Athletics | Trade |
| Jun 22, 2003 | Released | Todd Belitz | Florida Marlins | — | Release |
| Jun 22, 2003 | Signed as free agent | Rob Ryan | — | San Francisco Giants | Free agent signing |
| Jun 22, 2003 | Trade | Angel Santos | Boston Red Sox | Cleveland Indians | Trade |
| Jun 22, 2003 | Trade | Jamie Brown | Cleveland Indians | Boston Red Sox | Trade |
| Jun 21, 2003 | Signed as free agent | Tim Young | — | Colorado Rockies | Free agent signing |
| Jun 20, 2003 | Released | Mike Moriarty | Toronto Blue Jays | — | Release |
| Jun 20, 2003 | Released | Lyle Mouton | New York Mets | — | Release |
| Jun 20, 2003 | Signed as free agent | Jamey Wright | — | Kansas City Royals | Free agent signing |
| Jun 20, 2003 | Trade | Mark Bellhorn | Chicago Cubs | Colorado Rockies | Trade |
| Jun 20, 2003 | Trade | Jose Hernandez | Colorado Rockies | Chicago Cubs | Trade |
| Jun 19, 2003 | Released | Albie Lopez | Kansas City Royals | — | Release |
| Jun 19, 2003 | Released | Jerrod Riggan | New York Mets | — | Release |
| Jun 19, 2003 | Released | Rob Ryan | Toronto Blue Jays | — | Release |
| Jun 18, 2003 | Released | Kelly Dransfeldt | Cincinnati Reds | — | Release |
| Jun 18, 2003 | Released | Troy Mattes | Montreal Expos | — | Release |
| Jun 18, 2003 | Released | Steve Parris | Tampa Bay Devil Rays | — | Release |
| Jun 17, 2003 | Signed as free agent | Juan Acevedo | — | Toronto Blue Jays | Free agent signing |
| Jun 17, 2003 | Released | Cliff Brumbaugh | Chicago White Sox | — | Release |
| Jun 17, 2003 | Released | Cory Doyne | Houston Astros | — | Release |
| Jun 17, 2003 | Signed as free agent | Willie Morales | — | Arizona Diamondbacks | Free agent signing |
| Jun 17, 2003 | Signed as free agent | Jose Rodriguez | — | Montreal Expos | Free agent signing |
| Jun 16, 2003 | Signed as free agent | Carlos Castillo | — | Chicago White Sox | Free agent signing |
| Jun 16, 2003 | Signed as free agent | Randy Keisler | — | Texas Rangers | Free agent signing |
| Jun 15, 2003 | Released | Jamey Wright | Texas Rangers | — | Release |
| Jun 13, 2003 | Signed | Jose Constanza | — | Cleveland Indians | Amateur free agent signing |
| Jun 12, 2003 | Signed as free agent | Chad Mottola | — | Boston Red Sox | Free agent signing |
| Jun 12, 2003 | Released | Brian Simmons | San Diego Padres | — | Release |
| Jun 12, 2003 | Signed as free agent | Todd Van Poppel | — | Cincinnati Reds | Free agent signing |
| Jun 12, 2003 | Released | Tim Young | Toronto Blue Jays | — | Release |
| Jun 11, 2003 | Released | Tom Davey | Boston Red Sox | — | Release |
| Jun 11, 2003 | Released | Sean DePaula | Cincinnati Reds | — | Release |
| Jun 11, 2003 | Signed as free agent | Dennys Reyes | — | Arizona Diamondbacks | Free agent signing |
| Jun 10, 2003 | Released | Juan Acevedo | New York Yankees | — | Release |
| Jun 10, 2003 | Signed as free agent | James Baldwin | — | Minnesota Twins | Free agent signing |
| Jun 10, 2003 | Signed as free agent | Pat Lennon | Long Island | Detroit Tigers | Free agent signing |
| Jun 10, 2003 | Released | Willie Morales | St. Louis Cardinals | — | Release |
| Jun 9, 2003 | Released | Frank Castillo | Oakland Athletics | — | Release |
| Jun 9, 2003 | Signed as free agent | Jesus Feliciano | — | Tampa Bay Devil Rays | Free agent signing |
| Jun 9, 2003 | Released | Craig House | Seattle Mariners | — | Release |
| Jun 8, 2003 | Released | Sandy Martinez | Kansas City Royals | — | Release |
| Jun 8, 2003 | Released | Chad Mottola | Tampa Bay Devil Rays | — | Release |
| Jun 8, 2003 | Released | Marc Wilkins | Florida Marlins | — | Release |
| Jun 7, 2003 | Released | Jay Canizaro | Tampa Bay Devil Rays | — | Release |
| Jun 7, 2003 | Released | Charlie Greene | Tampa Bay Devil Rays | — | Release |
| Jun 7, 2003 | Released | Chris Piersoll | Cincinnati Reds | — | Release |
| Jun 7, 2003 | Released | Julio Zuleta | Boston Red Sox | — | Release |
| Jun 6, 2003 | Released | Pete Harnisch | Cincinnati Reds | — | Release |
| Jun 6, 2003 | Released | Charles Nagy | San Diego Padres | — | Release |
| Jun 6, 2003 | Signed as free agent | Mark Quinn | — | San Diego Padres | Free agent signing |
| Jun 6, 2003 | Trade | Ruben Sierra | Texas Rangers | New York Yankees | Trade |
| Jun 6, 2003 | Trade | Marcus Thames | New York Yankees | Texas Rangers | Trade |
| Jun 6, 2003 | Trade | Matt White | Boston Red Sox | Seattle Mariners | Trade |
| Jun 6, 2003 | Trade | Sheldon Fulse | Seattle Mariners | Boston Red Sox | Trade |
| Jun 5, 2003 | Released | Joe Lawrence | Milwaukee Brewers | — | Release |
| Jun 5, 2003 | Trade | Alan Benes | Texas Rangers | Chicago Cubs | Trade |
| Jun 5, 2003 | Trade | Steve O'Sullivan | Chicago Cubs | Texas Rangers | Trade |
| Jun 4, 2003 | Released | Damion Easley | Tampa Bay Devil Rays | — | Release |
| Jun 4, 2003 | Released | Ron Gant | Oakland Athletics | — | Release |
| Jun 4, 2003 | Released | Jeffrey Hammonds | Milwaukee Brewers | — | Release |
| Jun 4, 2003 | Released | Julio Santana | Philadelphia Phillies | — | Release |
| Jun 4, 2003 | Released | Todd Van Poppel | Texas Rangers | — | Release |
| Jun 3, 2003 | Signed | Randor Bierd | — | Detroit Tigers | Amateur free agent signing |
| Jun 3, 2003 | Signed as free agent | Mark Little | — | Cleveland Indians | Free agent signing |
| Jun 3, 2003 | Released | Ruben Rivera | San Francisco Giants | — | Release |
| Jun 2, 2003 | Signed as free agent | Rod Beck | — | San Diego Padres | Free agent signing |
| Jun 2, 2003 | Signed as free agent | Eric Cammack | — | Houston Astros | Free agent signing |
| Jun 2, 2003 | Signed as free agent | Jerrod Riggan | — | New York Mets | Free agent signing |
| Jun 2, 2003 | Signed as free agent | Blake Stein | — | Montreal Expos | Free agent signing |
| Jun 1, 2003 | Released | James Baldwin | Kansas City Royals | — | Release |
| Jun 1, 2003 | Signed as free agent | J. R. Phillips | — | Seattle Mariners | Free agent signing |
| May 31, 2003 | Released | Rod Beck | Chicago Cubs | — | Release |
| May 31, 2003 | Signed as free agent | Oscar Salazar | — | Kansas City Royals | Free agent signing |
| May 30, 2003 | Signed as free agent | Kevin Barker | — | Florida Marlins | Free agent signing |
| May 30, 2003 | Released | Eric Cammack | New York Mets | — | Release |
| May 30, 2003 | Released | Mark Little | Arizona Diamondbacks | — | Release |
| May 30, 2003 | Released | Nerio Rodriguez | St. Louis Cardinals | — | Release |
| May 29, 2003 | Released | Tom Evans | Detroit Tigers | — | Release |
| May 29, 2003 | Released | Jesus Feliciano | Los Angeles Dodgers | — | Release |
| May 29, 2003 | Trade | Shea Hillenbrand | Boston Red Sox | Arizona Diamondbacks | Trade |
| May 29, 2003 | Trade | Byung-Hyun Kim | Arizona Diamondbacks | Boston Red Sox | Trade |
| May 29, 2003 | Trade | Derrin Ebert | Chicago Cubs | Arizona Diamondbacks | Trade |
| May 29, 2003 | Trade | Chris Donnels | Arizona Diamondbacks | Chicago Cubs | Trade |
| May 27, 2003 | Released | Mark Quinn | Tampa Bay Devil Rays | — | Release |
| May 27, 2003 | Signed as free agent | Scott Seabol | — | St. Louis Cardinals | Free agent signing |
| May 27, 2003 | Released | Everett Stull | Minnesota Twins | — | Release |
| May 27, 2003 | Released | Greg Swindell | Arizona Diamondbacks | — | Release |
| May 27, 2003 | Trade | Esteban Yan | Texas Rangers | St. Louis Cardinals | Trade |
| May 27, 2003 | Trade | Rick Asadoorian | St. Louis Cardinals | Texas Rangers | Trade |
| May 27, 2003 | Trade | Alex Sanchez | Milwaukee Brewers | Detroit Tigers | Trade |
| May 27, 2003 | Trade | Chad Petty | Detroit Tigers | Milwaukee Brewers | Trade |
| May 27, 2003 | Trade | Noochie Varner | Detroit Tigers | Milwaukee Brewers | Trade |
| May 26, 2003 | Signed as free agent | Kris Keller | — | Cincinnati Reds | Free agent signing |
| May 26, 2003 | Released | Brian Lesher | St. Louis Cardinals | — | Release |
| May 25, 2003 | Signed as free agent | Jeff Abbott | — | Seattle Mariners | Free agent signing |
| May 25, 2003 | Signed | Steve Schmoll | — | Los Angeles Dodgers | Amateur free agent signing |
| May 25, 2003 | Trade | Mike Fyhrie | Cleveland Indians | Kansas City Royals | Trade |
| May 25, 2003 | Trade | Luis Cotto | Kansas City Royals | Cleveland Indians | Trade |
| May 24, 2003 | Released | Oscar Salazar | Anaheim Angels | — | Release |
| May 23, 2003 | Signed as free agent | Rob Sasser | — | Baltimore Orioles | Free agent signing |
| May 22, 2003 | Signed as free agent | Todd Belitz | — | Florida Marlins | Free agent signing |
| May 22, 2003 | Signed | Jair Jurrjens | — | Detroit Tigers | Amateur free agent signing |
| May 22, 2003 | Signed as free agent | Jose Nieves | — | New York Yankees | Free agent signing |
| May 21, 2003 | Signed as free agent | Luis Pineda | — | Los Angeles Dodgers | Free agent signing |
| May 21, 2003 | Signed as free agent | Jose Silva | — | San Diego Padres | Free agent signing |
| May 20, 2003 | Released | Kris Keller | San Diego Padres | — | Release |
| May 20, 2003 | Released | Blake Stein | Cleveland Indians | — | Release |
| May 19, 2003 | Signed as free agent | Ben Ford | — | Milwaukee Brewers | Free agent signing |
| May 19, 2003 | Signed as free agent | Ron Villone | — | Houston Astros | Free agent signing |
| May 19, 2003 | Trade | Damon Minor | San Francisco Giants | Philadelphia Phillies | Trade |
| May 19, 2003 | Trade | Tack Wilson | Philadelphia Phillies | San Francisco Giants | Trade |
| May 18, 2003 | Signed as free agent | Juan Diaz | — | Baltimore Orioles | Free agent signing |
| May 17, 2003 | Released | Calvin Maduro | Los Angeles Dodgers | — | Release |
| May 17, 2003 | Released | Brian O'Connor | Tampa Bay Devil Rays | — | Release |
| May 15, 2003 | Signed | Matt DeSalvo | — | New York Yankees | Amateur free agent signing |
| May 15, 2003 | Signed as free agent | Julio Lugo | — | Tampa Bay Devil Rays | Free agent signing |
| May 15, 2003 | Signed as free agent | Dan Miceli | — | Cleveland Indians | Free agent signing |
| May 15, 2003 | Signed as free agent | Jim Rushford | — | Milwaukee Brewers | Free agent signing |
| May 15, 2003 | Released | Scott Seabol | Milwaukee Brewers | — | Release |
| May 15, 2003 | Released | Ron Villone | Arizona Diamondbacks | — | Release |
| May 14, 2003 | Signed | Elian Herrera | — | Los Angeles Dodgers | Amateur free agent signing |
| May 13, 2003 | Released | Kevin McGlinchy | Tampa Bay Devil Rays | — | Release |
| May 13, 2003 | Released | Dan Miceli | Colorado Rockies | — | Release |
| May 13, 2003 | Released | Jose Silva | Oakland Athletics | — | Release |
| May 12, 2003 | Released | Will Cunnane | Chicago Cubs | — | Release |
| May 12, 2003 | Signed | Freddy Dolsi | — | Detroit Tigers | Amateur free agent signing |
| May 12, 2003 | Signed as free agent | Ramon Ramirez | — | Cincinnati Reds | Free agent signing |
| May 12, 2003 | Signed as free agent | Scott Sanders | — | Florida Marlins | Free agent signing |
| May 11, 2003 | Released | Jim Rushford | Texas Rangers | — | Release |
| May 10, 2003 | Released | Mario Encarnacion | St. Louis Cardinals | — | Release |
| May 10, 2003 | Signed as free agent | Brian Lesher | — | St. Louis Cardinals | Free agent signing |
| May 10, 2003 | Signed as free agent | Travis Miller | — | Milwaukee Brewers | Free agent signing |
| May 10, 2003 | Released | Jose Nieves | St. Louis Cardinals | — | Release |
| May 9, 2003 | Signed as free agent | Derrin Ebert | — | Chicago Cubs | Free agent signing |
| May 9, 2003 | Released | Julio Lugo | Houston Astros | — | Release |
| May 9, 2003 | Signed as free agent | Rob Stanifer | — | Houston Astros | Free agent signing |
| May 9, 2003 | Trade | Alan Benes | Chicago Cubs | Texas Rangers | Trade |
| May 9, 2003 | Trade | Unnamed | Texas Rangers | Chicago Cubs | a player to be named |
| May 8, 2003 | Signed as free agent | John Bale | — | Cincinnati Reds | Free agent signing |
| May 8, 2003 | Signed as free agent | Hansel Izquierdo | — | Montreal Expos | Free agent signing |
| May 8, 2003 | Released | Travis Miller | Cincinnati Reds | — | Release |
| May 8, 2003 | Signed as free agent | David Newhan | — | Colorado Rockies | Free agent signing |
| May 8, 2003 | Signed as free agent | Santiago Perez | — | Cincinnati Reds | Free agent signing |
| May 8, 2003 | Signed | Pablo Sandoval | — | San Francisco Giants | Amateur free agent signing |
| May 7, 2003 | Signed as free agent | Rolando Arrojo | — | New York Yankees | Free agent signing |
| May 7, 2003 | Signed as free agent | Wendell Magee | — | Detroit Tigers | Free agent signing |
| May 7, 2003 | Signed as free agent | Jamey Wright | — | Texas Rangers | Free agent signing |
| May 6, 2003 | Signed as free agent | Dave Burba | — | Milwaukee Brewers | Free agent signing |
| May 6, 2003 | Signed as free agent | Jed Hansen | — | Kansas City Royals | Free agent signing |
| May 6, 2003 | Signed as free agent | Mark Quinn | — | Tampa Bay Devil Rays | Free agent signing |
| May 6, 2003 | Signed as free agent | Rudy Seanez | — | Boston Red Sox | Free agent signing |
| May 5, 2003 | Released | Damon Buford | Montreal Expos | — | Release |
| May 5, 2003 | Released | Hansel Izquierdo | Boston Red Sox | — | Release |
| May 5, 2003 | Released | Rob Sasser | Kansas City Royals | — | Release |
| May 3, 2003 | Released | Brady Anderson | San Diego Padres | — | Release |
| May 3, 2003 | Released | John Bale | New York Mets | — | Release |
| May 3, 2003 | Released | Dave Burba | Cleveland Indians | — | Release |
| May 3, 2003 | Released | Santiago Perez | Baltimore Orioles | — | Release |
| May 3, 2003 | Released | Rudy Seanez | Texas Rangers | — | Release |
| May 3, 2003 | Trade | Joe Vitiello | San Francisco Giants | Montreal Expos | Trade |
| May 3, 2003 | Trade | Ben Washburn | Montreal Expos | San Francisco Giants | Trade |
| May 2, 2003 | Signed as free agent | Dave Borkowski | — | Baltimore Orioles | Free agent signing |
| May 2, 2003 | Released | Jed Hansen | St. Louis Cardinals | — | Release |
| Apr 30, 2003 | Released | Wendell Magee | Philadelphia Phillies | — | Release |
| Apr 30, 2003 | Released | Mark Quinn | San Diego Padres | — | Release |
| Apr 30, 2003 | Signed as free agent | Aaron Small | — | Florida Marlins | Free agent signing |
| Apr 30, 2003 | Released | Bryan Ward | Colorado Rockies | — | Release |
| Apr 30, 2003 | Trade | Matt Blank | Montreal Expos | San Francisco Giants | Trade |
| Apr 29, 2003 | Signed as free agent | Luke Carlin | — | San Diego Padres | Free agent signing |
| Apr 29, 2003 | Released | Scott MacRae | Cincinnati Reds | — | Release |
| Apr 29, 2003 | Signed as free agent | Marty McLeary | — | Florida Marlins | Free agent signing |
| Apr 29, 2003 | Released | Craig Paquette | Detroit Tigers | — | Release |
| Apr 28, 2003 | Released | Chad Kreuter | Texas Rangers | — | Release |
| Apr 28, 2003 | Released | Jamey Wright | Milwaukee Brewers | — | Release |
| Apr 27, 2003 | Released | Dave Borkowski | Detroit Tigers | — | Release |
| Apr 26, 2003 | Signed as free agent | Ken Ray | — | Milwaukee Brewers | Free agent signing |
| Apr 26, 2003 | Released | Rob Stanifer | Chicago Cubs | — | Release |
| Apr 25, 2003 | Signed as free agent | Andy Tracy | — | Colorado Rockies | Free agent signing |
| Apr 24, 2003 | Released | Chris Latham | New York Yankees | — | Release |
| Apr 24, 2003 | Released | Mitch Meluskey | Oakland Athletics | — | Release |
| Apr 23, 2003 | Signed | Luis Perdomo | — | Cleveland Indians | Amateur free agent signing |
| Apr 23, 2003 | Released | Jose Rodriguez | Minnesota Twins | — | Release |
| Apr 23, 2003 | Signed as free agent | Chuck Smith | — | Atlanta Braves | Free agent signing |
| Apr 22, 2003 | Released | Brent Billingsley | Philadelphia Phillies | — | Release |
| Apr 22, 2003 | Signed as free agent | Bob Scanlan | — | Houston Astros | Free agent signing |
| Apr 21, 2003 | Released | Javier Cardona | Chicago Cubs | — | Release |
| Apr 21, 2003 | Released | Dan Serafini | St. Louis Cardinals | — | Release |
| Apr 21, 2003 | Signed as free agent | Craig Wilson | — | New York Yankees | Free agent signing |
| Apr 19, 2003 | Released | Ivanon Coffie | St. Louis Cardinals | — | Release |
| Apr 19, 2003 | Signed as free agent | Jed Hansen | — | St. Louis Cardinals | Free agent signing |
| Apr 18, 2003 | Signed | Bobby Cramer | — | Tampa Bay Devil Rays | Amateur free agent signing |
| Apr 18, 2003 | Signed as free agent | Jeff Reboulet | — | Pittsburgh Pirates | Free agent signing |
| Apr 18, 2003 | Signed as free agent | Blake Stein | — | Cleveland Indians | Free agent signing |
| Apr 18, 2003 | Signed as free agent | Greg Swindell | — | Arizona Diamondbacks | Free agent signing |
| Apr 17, 2003 | Signed as free agent | Trace Coquillette | — | Boston Red Sox | Free agent signing |
| Apr 17, 2003 | Released | Ryan Thompson | Tampa Bay Devil Rays | — | Release |
| Apr 16, 2003 | Signed as free agent | Nate Teut | — | Chicago Cubs | Free agent signing |
| Apr 15, 2003 | Released | Marty McLeary | Boston Red Sox | — | Release |
| Apr 15, 2003 | Released | Nate Teut | Florida Marlins | — | Release |
| Apr 14, 2003 | Released | Todd Belitz | Colorado Rockies | — | Release |
| Apr 12, 2003 | Signed as free agent | Chris Widger | — | St. Louis Cardinals | Free agent signing |
| Apr 11, 2003 | Signed as free agent | Joey Hamilton | — | Cincinnati Reds | Free agent signing |
| Apr 11, 2003 | Signed as free agent | Bill Haselman | — | Boston Red Sox | Free agent signing |
| Apr 11, 2003 | Released | Brian Mallette | Los Angeles Dodgers | — | Release |
| Apr 11, 2003 | Signed as free agent | Erik Sabel | — | Arizona Diamondbacks | Free agent signing |
| Apr 10, 2003 | Released | Jed Hansen | Milwaukee Brewers | — | Release |
| Apr 10, 2003 | Signed as free agent | Mickey Lopez | — | Seattle Mariners | Free agent signing |
| Apr 10, 2003 | Signed as free agent | Dave Pember | — | Milwaukee Brewers | Free agent signing |
| Apr 10, 2003 | Signed as free agent | Shane Reynolds | — | Atlanta Braves | Free agent signing |
| Apr 10, 2003 | Signed as free agent | John Rocker | — | Tampa Bay Devil Rays | Free agent signing |
| Apr 9, 2003 | Signed as free agent | Frank Castillo | — | Oakland Athletics | Free agent signing |
| Apr 9, 2003 | Released | Andy Tracy | New York Mets | — | Release |
| Apr 9, 2003 | Signed as free agent | Greg Vaughn | — | Colorado Rockies | Free agent signing |
| Apr 8, 2003 | Signed as free agent | Todd Erdos | — | Minnesota Twins | Free agent signing |
| Apr 8, 2003 | Signed as free agent | Sandy Martinez | — | Kansas City Royals | Free agent signing |
| Apr 8, 2003 | Signed as free agent | Tony McKnight | — | Los Angeles Dodgers | Free agent signing |
| Apr 8, 2003 | Signed as free agent | Jake Robbins | — | Cleveland Indians | Free agent signing |
| Apr 7, 2003 | Signed as free agent | Charles Gipson | — | New York Yankees | Free agent signing |
| Apr 7, 2003 | Released | Chris Widger | New York Yankees | — | Release |
| Apr 5, 2003 | Signed as free agent | Jesus Sanchez | — | Colorado Rockies | Free agent signing |
| Apr 4, 2003 | Released | Derrin Ebert | Anaheim Angels | — | Release |
| Apr 3, 2003 | Signed as free agent | Pedro Feliciano | — | New York Mets | Free agent signing |
| Apr 3, 2003 | Signed as free agent | Chris Gissell | — | Colorado Rockies | Free agent signing |
| Apr 3, 2003 | Signed as free agent | Robert Machado | — | Baltimore Orioles | Free agent signing |
| Apr 3, 2003 | Signed as free agent | Travis Phelps | — | Atlanta Braves | Free agent signing |
| Apr 3, 2003 | Released | Brian Simmons | San Francisco Giants | — | Release |
| Apr 3, 2003 | Released | Greg Swindell | Arizona Diamondbacks | — | Release |
| Apr 2, 2003 | Signed as free agent | Damion Easley | — | Tampa Bay Devil Rays | Free agent signing |
| Apr 2, 2003 | Signed as free agent | Danny Kolb | — | Milwaukee Brewers | Free agent signing |
| Apr 2, 2003 | Signed as free agent | Al Levine | — | Tampa Bay Devil Rays | Free agent signing |
| Apr 2, 2003 | Signed | Cristhian Martinez | — | Detroit Tigers | Amateur free agent signing |
| Apr 2, 2003 | Released | Jake Robbins | Milwaukee Brewers | — | Release |
| Apr 2, 2003 | Signed as free agent | Lee Stevens | — | Milwaukee Brewers | Free agent signing |
| Apr 1, 2003 | Released | Rolando Arrojo | Pittsburgh Pirates | — | Release |
| Apr 1, 2003 | Signed as free agent | Matt Herges | — | San Diego Padres | Free agent signing |
| Apr 1, 2003 | Released | Jose Offerman | Montreal Expos | — | Release |
| Mar 31, 2003 | Signed as free agent | Jesse Carlson | — | Houston Astros | Free agent signing |
| Mar 31, 2003 | Released | James Lofton | Boston Red Sox | — | Release |
| Mar 31, 2003 | Released | Larry Sutton | Boston Red Sox | — | Release |
| Mar 30, 2003 | Released | Alberto Castillo | St. Louis Cardinals | — | Release |
| Mar 30, 2003 | Released | Trent Hubbard | Chicago Cubs | — | Release |
| Mar 30, 2003 | Released | Mickey Lopez | Chicago Cubs | — | Release |
| Mar 30, 2003 | Released | Sandy Martinez | Tampa Bay Devil Rays | — | Release |
| Mar 30, 2003 | Released | Erik Sabel | Tampa Bay Devil Rays | — | Release |
| Mar 30, 2003 | Signed as free agent | Bob Smith | — | New York Yankees | Free agent signing |
| Mar 29, 2003 | Released | Eliezer Alfonzo | Chicago Cubs | — | Release |
| Mar 29, 2003 | Signed as free agent | Darren Bragg | — | Atlanta Braves | Free agent signing |
| Mar 29, 2003 | Signed as free agent | Jose Cabrera | — | Philadelphia Phillies | Free agent signing |
| Mar 29, 2003 | Released | David Cortes | Arizona Diamondbacks | — | Release |
| Mar 29, 2003 | Released | Chris Gissell | Houston Astros | — | Release |
| Mar 29, 2003 | Signed as free agent | Wayne Gomes | — | Philadelphia Phillies | Free agent signing |
| Mar 29, 2003 | Released | Michael Jackson | Arizona Diamondbacks | — | Release |
| Mar 29, 2003 | Signed as free agent | Al Martin | — | Tampa Bay Devil Rays | Free agent signing |
| Mar 29, 2003 | Released | Felix Martinez | Chicago Cubs | — | Release |
| Mar 29, 2003 | Signed as free agent | Randy Ruiz | — | Baltimore Orioles | Free agent signing |
| Mar 29, 2003 | Signed as free agent | Julio Santana | — | Philadelphia Phillies | Free agent signing |
| Mar 29, 2003 | Signed as free agent | Terry Shumpert | — | Tampa Bay Devil Rays | Free agent signing |
| Mar 29, 2003 | Released | Aaron Small | Chicago Cubs | — | Release |
| Mar 29, 2003 | Signed as free agent | Ron Villone | — | Arizona Diamondbacks | Free agent signing |
| Mar 29, 2003 | Trade | Ryan Cameron | Colorado Rockies | Boston Red Sox | Trade |
| Mar 29, 2003 | Trade | Mike Fyhrie | Philadelphia Phillies | Cleveland Indians | Trade |
| Mar 28, 2003 | Released | Adrian Brown | Tampa Bay Devil Rays | — | Release |
| Mar 28, 2003 | Signed as free agent | Adrian Brown | — | Boston Red Sox | Free agent signing |
| Mar 28, 2003 | Released | Robinson Cancel | Detroit Tigers | — | Release |
| Mar 28, 2003 | Released | Jesse Carlson | Detroit Tigers | — | Release |
| Mar 28, 2003 | Released | Luke Carlin | Detroit Tigers | — | Release |
| Mar 28, 2003 | Signed as free agent | Giovanni Carrara | — | Seattle Mariners | Free agent signing |
| Mar 28, 2003 | Released | Trace Coquillette | Montreal Expos | — | Release |
| Mar 28, 2003 | Released | Damion Easley | Detroit Tigers | — | Release |
| Mar 28, 2003 | Released | Ben Ford | Minnesota Twins | — | Release |
| Mar 28, 2003 | Released | Charles Gipson | Chicago Cubs | — | Release |
| Mar 28, 2003 | Released | Al Martin | Florida Marlins | — | Release |
| Mar 28, 2003 | Released | Jeff Reboulet | Baltimore Orioles | — | Release |
| Mar 28, 2003 | Released | Jesus Sanchez | Houston Astros | — | Release |
| Mar 28, 2003 | Released | Terry Shumpert | Los Angeles Dodgers | — | Release |
| Mar 28, 2003 | Signed as free agent | Mike Venafro | — | Tampa Bay Devil Rays | Free agent signing |
| Mar 28, 2003 | Signed as free agent | Marc Wilkins | — | Florida Marlins | Free agent signing |
| Mar 27, 2003 | Released | Jason Beverlin | Cleveland Indians | — | Release |
| Mar 27, 2003 | Released | Jose Cabrera | Minnesota Twins | — | Release |
| Mar 27, 2003 | Released | Bill Haselman | Detroit Tigers | — | Release |
| Mar 27, 2003 | Signed as free agent | Dan Reichert | — | Toronto Blue Jays | Free agent signing |
| Mar 27, 2003 | Released | Shane Reynolds | Houston Astros | — | Release |
| Mar 27, 2003 | Trade | Ross Gload | Colorado Rockies | Chicago White Sox | Trade |
| Mar 27, 2003 | Trade | Wade Parrish | Chicago White Sox | Colorado Rockies | Trade |
| Mar 27, 2003 | Trade | Fernando Lunar | Texas Rangers | Kansas City Royals | Trade |
| Mar 27, 2003 | Trade | Odannys Ayala | Kansas City Royals | Texas Rangers | Trade |
| Mar 26, 2003 | Signed as free agent | Carlos Baerga | — | Arizona Diamondbacks | Free agent signing |
| Mar 26, 2003 | Released | Glen Barker | Atlanta Braves | — | Release |
| Mar 26, 2003 | Released | Giovanni Carrara | Los Angeles Dodgers | — | Release |
| Mar 26, 2003 | Released | Frank Castillo | Boston Red Sox | — | Release |
| Mar 26, 2003 | Released | Joey Hamilton | St. Louis Cardinals | — | Release |
| Mar 26, 2003 | Released | Matt Herges | Pittsburgh Pirates | — | Release |
| Mar 26, 2003 | Released | Al Levine | St. Louis Cardinals | — | Release |
| Mar 26, 2003 | Released | Robert Machado | Milwaukee Brewers | — | Release |
| Mar 26, 2003 | Released | Travis Phelps | Tampa Bay Devil Rays | — | Release |
| Mar 26, 2003 | Released | Mike Venafro | Atlanta Braves | — | Release |
| Mar 26, 2003 | Signed as free agent | Jamey Wright | — | Milwaukee Brewers | Free agent signing |
| Mar 25, 2003 | Signed as free agent | Manny Aybar | — | San Francisco Giants | Free agent signing |
| Mar 25, 2003 | Released | Juan Diaz | Boston Red Sox | — | Release |
| Mar 25, 2003 | Released | Donovan Osborne | New York Mets | — | Release |
| Mar 25, 2003 | Released | Jose Paniagua | Tampa Bay Devil Rays | — | Release |
| Mar 25, 2003 | Released | Dave Pember | Milwaukee Brewers | — | Release |
| Mar 25, 2003 | Trade | Chris Spurling | Atlanta Braves | Detroit Tigers | Trade |
| Mar 25, 2003 | Trade | Matt Coenen | Detroit Tigers | Atlanta Braves | Trade |
| Mar 25, 2003 | Trade | Wendell Magee | Cleveland Indians | Philadelphia Phillies | Trade |
| Mar 24, 2003 | Released | Joe Dillon | Minnesota Twins | — | Release |
| Mar 24, 2003 | Signed | Mauro Gomez | — | Texas Rangers | Amateur free agent signing |
| Mar 24, 2003 | Signed as free agent | Greg Hansell | — | New York Yankees | Free agent signing |
| Mar 24, 2003 | Released | Jason Jacome | Arizona Diamondbacks | — | Release |
| Mar 24, 2003 | Released | Miguel Ojeda | San Diego Padres | — | Release |
| Mar 24, 2003 | Signed as free agent | Alberto Reyes | — | New York Yankees | Free agent signing |
| Mar 24, 2003 | Released | Randy Ruiz | Cincinnati Reds | — | Release |
| Mar 24, 2003 | Trade | Jason Conti | Tampa Bay Devil Rays | Milwaukee Brewers | Trade |
| Mar 24, 2003 | Trade | Javier Valentin | Milwaukee Brewers | Tampa Bay Devil Rays | Trade |
| Mar 24, 2003 | Trade | Unnamed | San Francisco Giants | Montreal Expos | $ |
| Mar 24, 2003 | Trade | Edwards Guzman | San Francisco Giants | Montreal Expos | Trade |
| Mar 24, 2003 | Trade | Livan Hernandez | San Francisco Giants | Montreal Expos | Trade |
| Mar 24, 2003 | Trade | Jim Brower | Montreal Expos | San Francisco Giants | Trade |
| Mar 23, 2003 | Released | Kevin Barker | Detroit Tigers | — | Release |
| Mar 23, 2003 | Released | Julio Santana | Detroit Tigers | — | Release |
| Mar 23, 2003 | Released | Jermaine Van Buren | Colorado Rockies | — | Release |
| Mar 22, 2003 | Released | Jeff Abbott | New York Mets | — | Release |
| Mar 22, 2003 | Signed as free agent | Willie Banks | — | New York Yankees | Free agent signing |
| Mar 22, 2003 | Released | Brian Lesher | Tampa Bay Devil Rays | — | Release |
| Mar 22, 2003 | Released | Scott Sobkowiak | Atlanta Braves | — | Release |
| Mar 22, 2003 | Released | Blake Stein | Tampa Bay Devil Rays | — | Release |
| Mar 22, 2003 | Signed as free agent | Mike Thurman | — | New York Yankees | Free agent signing |
| Mar 22, 2003 | Released | Greg Vaughn | Tampa Bay Devil Rays | — | Release |
| Mar 21, 2003 | Released | Winston Abreu | New York Yankees | — | Release |
| Mar 21, 2003 | Released | Manny Aybar | Arizona Diamondbacks | — | Release |
| Mar 21, 2003 | Signed as free agent | Lou Collier | — | Boston Red Sox | Free agent signing |
| Mar 21, 2003 | Released | Luis Pineda | Cincinnati Reds | — | Release |
| Mar 21, 2003 | Signed as free agent | Mark Quinn | — | San Diego Padres | Free agent signing |
| Mar 21, 2003 | Trade | Jack Cust | Colorado Rockies | Baltimore Orioles | Trade |
| Mar 21, 2003 | Trade | Chris Richard | Baltimore Orioles | Colorado Rockies | Trade |
| Mar 20, 2003 | Released | Tim Christman | Chicago Cubs | — | Release |
| Mar 20, 2003 | Released | T. J. Mathews | New York Mets | — | Release |
| Mar 20, 2003 | Released | Mike Thurman | Cleveland Indians | — | Release |
| Mar 19, 2003 | Trade | Unnamed | San Diego Padres | New York Yankees | $ |
| Mar 19, 2003 | Trade | Bubba Trammell | San Diego Padres | New York Yankees | Trade |
| Mar 19, 2003 | Trade | Mark Phillips | San Diego Padres | New York Yankees | Trade |
| Mar 19, 2003 | Trade | Rondell White | New York Yankees | San Diego Padres | Trade |
| Mar 18, 2003 | Signed as free agent | Clay Bellinger | — | San Francisco Giants | Free agent signing |
| Mar 18, 2003 | Released | Paxton Crawford | Oakland Athletics | — | Release |
| Mar 18, 2003 | Released | Calvin Pickering | Seattle Mariners | — | Release |
| Mar 18, 2003 | Released | Lee Stevens | Tampa Bay Devil Rays | — | Release |
| Mar 18, 2003 | Released | Jamey Wright | Seattle Mariners | — | Release |
| Mar 18, 2003 | Trade | Javier Lopez | Boston Red Sox | Colorado Rockies | Trade |
| Mar 17, 2003 | Signed as free agent | Rob Bell | — | Tampa Bay Devil Rays | Free agent signing |
| Mar 17, 2003 | Signed as free agent | Kenny Rogers | — | Minnesota Twins | Free agent signing |
| Mar 16, 2003 | Signed as free agent | Mark Little | — | Arizona Diamondbacks | Free agent signing |
| Mar 15, 2003 | Signed as free agent | Benny Agbayani | — | Cincinnati Reds | Free agent signing |
| Mar 15, 2003 | Signed as free agent | Jesse Garcia | — | Atlanta Braves | Free agent signing |
| Mar 14, 2003 | Signed as free agent | Alberto Castillo | — | San Francisco Giants | Free agent signing |
| Mar 14, 2003 | Signed as free agent | Bruce Chen | — | Houston Astros | Free agent signing |
| Mar 14, 2003 | Signed as free agent | Kenny Lofton | — | Pittsburgh Pirates | Free agent signing |
| Mar 13, 2003 | Released | Pedro Borbon | Los Angeles Dodgers | — | Release |
| Mar 13, 2003 | Signed as free agent | Jose Guillen | — | Cincinnati Reds | Free agent signing |
| Mar 13, 2003 | Signed as free agent | Olmedo Saenz | — | Oakland Athletics | Free agent signing |
| Mar 12, 2003 | Released | Benny Agbayani | Boston Red Sox | — | Release |
| Mar 12, 2003 | Released | Willie Banks | Boston Red Sox | — | Release |
| Mar 12, 2003 | Released | Rob Bell | Texas Rangers | — | Release |
| Mar 12, 2003 | Signed as free agent | Pasqual Coco | — | Milwaukee Brewers | Free agent signing |
| Mar 12, 2003 | Signed as free agent | Alejandro Freire | — | San Francisco Giants | Free agent signing |
| Mar 12, 2003 | Released | Jose Guillen | Cincinnati Reds | — | Release |
| Mar 12, 2003 | Released | Kevin Orie | Chicago Cubs | — | Release |
| Mar 12, 2003 | Released | Dan Reichert | Tampa Bay Devil Rays | — | Release |
| Mar 11, 2003 | Released | Pasqual Coco | Toronto Blue Jays | — | Release |
| Mar 11, 2003 | Released | Mark Quinn | Kansas City Royals | — | Release |
| Mar 10, 2003 | Released | Bruce Chen | Cincinnati Reds | — | Release |
| Mar 10, 2003 | Signed as free agent | Paxton Crawford | — | Oakland Athletics | Free agent signing |
| Mar 10, 2003 | Released | Wayne Gomes | Tampa Bay Devil Rays | — | Release |
| Mar 10, 2003 | Released | Alberto Reyes | Pittsburgh Pirates | — | Release |
| Mar 10, 2003 | Signed as free agent | Reggie Sanders | — | Pittsburgh Pirates | Free agent signing |
| Mar 8, 2003 | Signed as free agent | Derrin Ebert | — | Anaheim Angels | Free agent signing |
| Mar 8, 2003 | Signed | Kazuhito Tadano | — | Cleveland Indians | Amateur free agent signing |
| Mar 7, 2003 | Signed as free agent | Glen Barker | — | Atlanta Braves | Free agent signing |
| Mar 7, 2003 | Signed as free agent | B. J. Surhoff | — | Baltimore Orioles | Free agent signing |
| Mar 6, 2003 | Signed as free agent | Orber Moreno | — | New York Mets | Free agent signing |
| Mar 6, 2003 | Trade | Jeff Austin | Kansas City Royals | Cincinnati Reds | Trade |
| Mar 6, 2003 | Trade | Brian Shackelford | Kansas City Royals | Cincinnati Reds | Trade |
| Mar 6, 2003 | Trade | Alan Moye | Cincinnati Reds | Kansas City Royals | Trade |
| Mar 6, 2003 | Trade | Damaso Espino | Cincinnati Reds | Kansas City Royals | Trade |
| Mar 5, 2003 | Signed as free agent | Kurt Abbott | — | St. Louis Cardinals | Free agent signing |
| Mar 5, 2003 | Signed | Sam Deduno | — | Colorado Rockies | Amateur free agent signing |
| Mar 5, 2003 | Signed as free agent | Ramon Ramirez | — | New York Yankees | Free agent signing |
| Mar 4, 2003 | Signed as free agent | Trent Hubbard | — | Chicago Cubs | Free agent signing |
| Mar 4, 2003 | Released | Elvis Peña | Kansas City Royals | — | Release |
| Mar 3, 2003 | Signed | Brad Harman | — | Philadelphia Phillies | Amateur free agent signing |
| Mar 2, 2003 | Signed | Esmerling Vasquez | — | Arizona Diamondbacks | Amateur free agent signing |
| Mar 1, 2003 | Signed as free agent | Javier Cardona | — | Chicago Cubs | Free agent signing |
| Mar 1, 2003 | Signed as free agent | Hector Carrasco | — | Baltimore Orioles | Free agent signing |
| Mar 1, 2003 | Signed | Francisco Cervelli | — | New York Yankees | Amateur free agent signing |
| Mar 2003 | Released | Rich Garces | Colorado Rockies | — | Release (date approximate, per the source) |
| Feb 28, 2003 | Signed as free agent | Ronnie Belliard | — | Colorado Rockies | Free agent signing |
| Feb 28, 2003 | Signed | Pedro Ciriaco | — | Arizona Diamondbacks | Amateur free agent signing |
| Feb 27, 2003 | Signed as free agent | Paul Abbott | — | Arizona Diamondbacks | Free agent signing |
| Feb 27, 2003 | Signed as free agent | Jason Jacome | — | Arizona Diamondbacks | Free agent signing |
| Feb 27, 2003 | Signed as free agent | Jose Paniagua | — | Tampa Bay Devil Rays | Free agent signing |
| Feb 26, 2003 | Signed as free agent | Tom Martin | — | Los Angeles Dodgers | Free agent signing |
| Feb 26, 2003 | Signed as free agent | Jose Offerman | — | Montreal Expos | Free agent signing |
| Feb 26, 2003 | Signed as free agent | Santiago Perez | — | Baltimore Orioles | Free agent signing |
| Feb 25, 2003 | Signed as free agent | Dave Hollins | — | Philadelphia Phillies | Free agent signing |
| Feb 24, 2003 | Released | Homer Bush | San Diego Padres | — | Release |
| Feb 24, 2003 | Signed as free agent | Jose Nieves | — | St. Louis Cardinals | Free agent signing |
| Feb 22, 2003 | Signed as free agent | Donovan Osborne | — | New York Mets | Free agent signing |
| Feb 22, 2003 | Signed as free agent | Robert Person | — | Boston Red Sox | Free agent signing |
| Feb 21, 2003 | Signed | Alexi Casilla | — | Anaheim Angels | Amateur free agent signing |
| Feb 21, 2003 | Signed as free agent | Ron Gant | — | Oakland Athletics | Free agent signing |
| Feb 21, 2003 | Signed as free agent | Bill Simas | — | Los Angeles Dodgers | Free agent signing |
| Feb 20, 2003 | Signed as free agent | T. J. Mathews | — | New York Mets | Free agent signing |
| Feb 19, 2003 | Signed | Leyson Septimo | — | Arizona Diamondbacks | Amateur free agent signing |
| Feb 19, 2003 | Signed as free agent | Clint Sodowsky | — | Florida Marlins | Free agent signing |
| Feb 18, 2003 | Signed as free agent | Damon Buford | — | Montreal Expos | Free agent signing |
| Feb 18, 2003 | Signed as free agent | Andrew Lorraine | — | Los Angeles Dodgers | Free agent signing |
| Feb 17, 2003 | Signed as free agent | Chad Durbin | — | Cleveland Indians | Free agent signing |
| Feb 17, 2003 | Signed as free agent | Craig House | — | Seattle Mariners | Free agent signing |
| Feb 17, 2003 | Signed as free agent | Wendell Magee | — | Cleveland Indians | Free agent signing |
| Feb 17, 2003 | Signed as free agent | Jose Nunez | — | San Diego Padres | Free agent signing |
| Feb 17, 2003 | Released | Alex Ochoa | St. Louis Cardinals | — | Release |
| Feb 17, 2003 | Signed as free agent | Oscar Salazar | — | Anaheim Angels | Free agent signing |
| Feb 16, 2003 | Signed as free agent | Randy Keisler | — | San Diego Padres | Free agent signing |
| Feb 15, 2003 | Signed as free agent | Leo Estrella | — | Milwaukee Brewers | Free agent signing |
| Feb 15, 2003 | Signed | Radhames Liz | — | Baltimore Orioles | Amateur free agent signing |
| Feb 15, 2003 | Signed as free agent | Lyle Mouton | — | New York Mets | Free agent signing |
| Feb 14, 2003 | Signed as free agent | Jeff Abbott | — | New York Mets | Free agent signing |
| Feb 14, 2003 | Signed as free agent | Dave Burba | — | Cleveland Indians | Free agent signing |
| Feb 14, 2003 | Signed as free agent | Wayne Gomes | — | Tampa Bay Devil Rays | Free agent signing |
| Feb 14, 2003 | Signed as free agent | Scott Service | — | Arizona Diamondbacks | Free agent signing |
| Feb 13, 2003 | Signed as free agent | David Cone | — | New York Mets | Free agent signing |
| Feb 13, 2003 | Signed as free agent | Tim Crabtree | — | Milwaukee Brewers | Free agent signing |
| Feb 13, 2003 | Signed as free agent | Al Martin | — | Florida Marlins | Free agent signing |
| Feb 13, 2003 | Signed as free agent | Steve Torrealba | — | St. Louis Cardinals | Free agent signing |
| Feb 12, 2003 | Signed as free agent | Lorenzo Barcelo | — | San Francisco Giants | Free agent signing |
| Feb 12, 2003 | Signed as free agent | Wilfredo Rodriguez | — | Montreal Expos | Free agent signing |
| Feb 11, 2003 | Signed as free agent | Jay Bell | — | New York Mets | Free agent signing |
| Feb 11, 2003 | Signed as free agent | Mike Fetters | — | Minnesota Twins | Free agent signing |
| Feb 11, 2003 | Signed as free agent | Rick Helling | — | Baltimore Orioles | Free agent signing |
| Feb 10, 2003 | Signed as free agent | Mike Saipe | — | Los Angeles Dodgers | Free agent signing |
| Feb 10, 2003 | Signed as free agent | Rob Sasser | — | Kansas City Royals | Free agent signing |
| Feb 8, 2003 | Signed as free agent | Lee Gardner | — | Tampa Bay Devil Rays | Free agent signing |
| Feb 8, 2003 | Signed as free agent | Ron Wright | — | Cleveland Indians | Free agent signing |
| Feb 7, 2003 | Signed as free agent | Dennys Reyes | — | Pittsburgh Pirates | Free agent signing |
| Feb 6, 2003 | Signed | Jose Contreras | — | New York Yankees | Amateur free agent signing |
| Feb 6, 2003 | Signed as free agent | Mike Fyhrie | — | Philadelphia Phillies | Free agent signing |
| Feb 6, 2003 | Signed as free agent | Travis Lee | — | Tampa Bay Devil Rays | Free agent signing |
| Feb 6, 2003 | Signed as free agent | Dan Wheeler | — | New York Mets | Free agent signing |
| Feb 5, 2003 | Signed as free agent | Juan Alvarez | — | Florida Marlins | Free agent signing |
| Feb 5, 2003 | Released | Mike Coolbaugh | Philadelphia Phillies | — | Release |
| Feb 5, 2003 | Signed as free agent | Andres Galarraga | — | San Francisco Giants | Free agent signing |
| Feb 5, 2003 | Released | Randy Keisler | New York Yankees | — | Release |
| Feb 5, 2003 | Signed as free agent | Masao Kida | — | Los Angeles Dodgers | Free agent signing |
| Feb 5, 2003 | Signed | Wilkin Ramirez | — | Detroit Tigers | Amateur free agent signing |
| Feb 4, 2003 | Signed as free agent | Brent Billingsley | — | Philadelphia Phillies | Free agent signing |
| Feb 4, 2003 | Signed as free agent | Mike Glavine | — | New York Mets | Free agent signing |
| Feb 4, 2003 | Signed as free agent | Jon Lieber | — | New York Yankees | Free agent signing |
| Feb 4, 2003 | Signed as free agent | Paul Rigdon | — | Cleveland Indians | Free agent signing |
| Feb 3, 2003 | Signed as free agent | Sean Bergman | — | Florida Marlins | Free agent signing |
| Feb 3, 2003 | Signed as free agent | Keith Lockhart | — | San Diego Padres | Free agent signing |
| Feb 3, 2003 | Signed as free agent | Darren Oliver | — | Colorado Rockies | Free agent signing |
| Feb 3, 2003 | Signed as free agent | Jose Rodriguez | — | Minnesota Twins | Free agent signing |
| Feb 3, 2003 | Signed | Vinny Rottino | — | Milwaukee Brewers | Amateur free agent signing |
| Feb 3, 2003 | Signed as free agent | Ruben Sierra | — | Texas Rangers | Free agent signing |
| Feb 3, 2003 | Signed as free agent | Pedro Swann | — | Baltimore Orioles | Free agent signing |
| Feb 3, 2003 | Signed as free agent | Kevin Witt | — | Detroit Tigers | Free agent signing |
| Feb 2, 2003 | Signed as free agent | Chris Magruder | — | Cleveland Indians | Free agent signing |
| Feb 2, 2003 | Signed as free agent | Orlando Palmeiro | — | St. Louis Cardinals | Free agent signing |
| Feb 1, 2003 | Signed as free agent | Alex Ochoa | — | St. Louis Cardinals | Free agent signing |
| Jan 31, 2003 | Signed as free agent | Wilson Alvarez | — | Los Angeles Dodgers | Free agent signing |
| Jan 31, 2003 | Signed as free agent | Mario Encarnacion | — | Montreal Expos | Free agent signing |
| Jan 31, 2003 | Signed | Chin-lung Hu | — | Los Angeles Dodgers | Amateur free agent signing |
| Jan 31, 2003 | Signed as free agent | Pat Mahomes | — | Pittsburgh Pirates | Free agent signing |
| Jan 31, 2003 | Signed as free agent | Jason Pearson | — | St. Louis Cardinals | Free agent signing |
| Jan 31, 2003 | Signed as free agent | Jeff Suppan | — | Pittsburgh Pirates | Free agent signing |
| Jan 31, 2003 | Signed as free agent | John Vander Wal | — | Milwaukee Brewers | Free agent signing |
| Jan 30, 2003 | Signed as free agent | Shane Andrews | — | Minnesota Twins | Free agent signing |
| Jan 30, 2003 | Signed as free agent | Ricky Bottalico | — | Arizona Diamondbacks | Free agent signing |
| Jan 30, 2003 | Signed as free agent | Ron Coomer | — | Los Angeles Dodgers | Free agent signing |
| Jan 30, 2003 | Signed as free agent | Marc Kroon | — | Anaheim Angels | Free agent signing |
| Jan 30, 2003 | Signed as free agent | Terry Shumpert | — | Los Angeles Dodgers | Free agent signing |
| Jan 29, 2003 | Signed as free agent | Trace Coquillette | — | Montreal Expos | Free agent signing |
| Jan 29, 2003 | Signed as free agent | Mike Holtz | — | Pittsburgh Pirates | Free agent signing |
| Jan 29, 2003 | Signed as free agent | Michael Jackson | — | Arizona Diamondbacks | Free agent signing |
| Jan 29, 2003 | Signed as free agent | Jeff Reboulet | — | Baltimore Orioles | Free agent signing |
| Jan 29, 2003 | Signed as free agent | Carlos Reyes | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 29, 2003 | Signed as free agent | Mark Smith | — | Milwaukee Brewers | Free agent signing |
| Jan 29, 2003 | Signed as free agent | Scott Winchester | — | Los Angeles Dodgers | Free agent signing |
| Jan 28, 2003 | Signed as free agent | James Baldwin | — | Kansas City Royals | Free agent signing |
| Jan 28, 2003 | Signed as free agent | Stubby Clapp | — | Atlanta Braves | Free agent signing |
| Jan 28, 2003 | Signed as free agent | Jose Cruz | — | San Francisco Giants | Free agent signing |
| Jan 28, 2003 | Signed as free agent | Jeff D'Amico | — | Pittsburgh Pirates | Free agent signing |
| Jan 28, 2003 | Signed as free agent | Ivan Rodriguez | — | Florida Marlins | Free agent signing |
| Jan 28, 2003 | Signed as free agent | Julian Tavarez | — | Pittsburgh Pirates | Free agent signing |
| Jan 28, 2003 | Signed as free agent | Jamey Wright | — | Seattle Mariners | Free agent signing |
| Jan 27, 2003 | Signed as free agent | Juan Acevedo | — | New York Yankees | Free agent signing |
| Jan 27, 2003 | Signed as free agent | Brian Cooper | — | Chicago White Sox | Free agent signing |
| Jan 27, 2003 | Signed as free agent | Brian Daubach | — | Chicago White Sox | Free agent signing |
| Jan 27, 2003 | Signed as free agent | Charles Gipson | — | Chicago Cubs | Free agent signing |
| Jan 27, 2003 | Signed as free agent | Lenny Harris | — | Chicago Cubs | Free agent signing |
| Jan 27, 2003 | Signed as free agent | Mike Johnson | — | San Francisco Giants | Free agent signing |
| Jan 27, 2003 | Signed as free agent | Eddie Oropesa | — | Arizona Diamondbacks | Free agent signing |
| Jan 27, 2003 | Signed as free agent | Eddie Perez | — | Milwaukee Brewers | Free agent signing |
| Jan 27, 2003 | Signed as free agent | Jake Robbins | — | Milwaukee Brewers | Free agent signing |
| Jan 27, 2003 | Signed as free agent | Julio Santana | — | Detroit Tigers | Free agent signing |
| Jan 27, 2003 | Signed as free agent | Mike Thurman | — | Cleveland Indians | Free agent signing |
| Jan 27, 2003 | Trade | Luke Allen | Los Angeles Dodgers | Colorado Rockies | Trade |
| Jan 27, 2003 | Trade | Jason Romano | Colorado Rockies | Los Angeles Dodgers | Trade |
| Jan 27, 2003 | Trade | John-Ford Griffin | Oakland Athletics | Toronto Blue Jays | Trade |
| Jan 25, 2003 | Signed as free agent | Jose Cabrera | — | Minnesota Twins | Free agent signing |
| Jan 25, 2003 | Trade | Daryle Ward | Houston Astros | Los Angeles Dodgers | Trade |
| Jan 25, 2003 | Trade | Ruddy Lugo | Los Angeles Dodgers | Houston Astros | Trade |
| Jan 24, 2003 | Signed as free agent | Manny Aybar | — | Arizona Diamondbacks | Free agent signing |
| Jan 24, 2003 | Signed as free agent | Kevin Barker | — | Detroit Tigers | Free agent signing |
| Jan 24, 2003 | Signed as free agent | Jose Hernandez | — | Colorado Rockies | Free agent signing |
| Jan 24, 2003 | Signed as free agent | Randy Knorr | — | Montreal Expos | Free agent signing |
| Jan 24, 2003 | Signed as free agent | Graeme Lloyd | — | New York Mets | Free agent signing |
| Jan 24, 2003 | Signed as free agent | Esteban Loaiza | — | Chicago White Sox | Free agent signing |
| Jan 24, 2003 | Signed as free agent | Troy Mattes | — | Montreal Expos | Free agent signing |
| Jan 24, 2003 | Signed as free agent | Ruben Rivera | — | San Francisco Giants | Free agent signing |
| Jan 24, 2003 | Signed as free agent | Mark Sweeney | — | Colorado Rockies | Free agent signing |
| Jan 23, 2003 | Signed as free agent | Hector Almonte | — | Boston Red Sox | Free agent signing |
| Jan 23, 2003 | Signed as free agent | Steve Avery | — | Detroit Tigers | Free agent signing |
| Jan 23, 2003 | Signed as free agent | Will Cunnane | — | Chicago Cubs | Free agent signing |
| Jan 23, 2003 | Signed as free agent | Courtney Duncan | — | Pittsburgh Pirates | Free agent signing |
| Jan 23, 2003 | Signed as free agent | Tom Gordon | — | Chicago White Sox | Free agent signing |
| Jan 23, 2003 | Signed as free agent | Roberto Hernandez | — | Atlanta Braves | Free agent signing |
| Jan 23, 2003 | Released | Randy Knorr | Montreal Expos | — | Release |
| Jan 23, 2003 | Signed as free agent | Eric Knott | — | Montreal Expos | Free agent signing |
| Jan 23, 2003 | Signed as free agent | Steve Reed | — | Colorado Rockies | Free agent signing |
| Jan 23, 2003 | Signed as free agent | Adam Riggs | — | Anaheim Angels | Free agent signing |
| Jan 23, 2003 | Signed as free agent | Rich Rodriguez | — | Anaheim Angels | Free agent signing |
| Jan 23, 2003 | Signed as free agent | Rick White | — | Chicago White Sox | Free agent signing |
| Jan 22, 2003 | Signed as free agent | Ivanon Coffie | — | St. Louis Cardinals | Free agent signing |
| Jan 22, 2003 | Signed as free agent | Rich Garces | — | Colorado Rockies | Free agent signing |
| Jan 22, 2003 | Signed as free agent | Josias Manzanillo | — | Cincinnati Reds | Free agent signing |
| Jan 22, 2003 | Signed as free agent | Luis Ordaz | — | Kansas City Royals | Free agent signing |
| Jan 22, 2003 | Signed as free agent | David Ortiz | — | Boston Red Sox | Free agent signing |
| Jan 22, 2003 | Signed as free agent | Chris Piersoll | — | Cincinnati Reds | Free agent signing |
| Jan 21, 2003 | Signed as free agent | Jorge Fabregas | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 21, 2003 | Signed as free agent | Pete Harnisch | — | Cincinnati Reds | Free agent signing |
| Jan 21, 2003 | Signed as free agent | Bobby Jones | — | Atlanta Braves | Free agent signing |
| Jan 21, 2003 | Released | Lou Pote | Anaheim Angels | — | Release |
| Jan 21, 2003 | Signed as free agent | Fernando Seguignol | — | New York Yankees | Free agent signing |
| Jan 21, 2003 | Signed as free agent | Lee Stevens | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 20, 2003 | Signed as free agent | Rafael Betancourt | — | Cleveland Indians | Free agent signing |
| Jan 20, 2003 | Signed as free agent | Tony Clark | — | New York Mets | Free agent signing |
| Jan 20, 2003 | Signed as free agent | Mark Guthrie | — | Chicago Cubs | Free agent signing |
| Jan 20, 2003 | Signed as free agent | Bill Haselman | — | Detroit Tigers | Free agent signing |
| Jan 20, 2003 | Signed as free agent | Dustin Hermanson | — | St. Louis Cardinals | Free agent signing |
| Jan 20, 2003 | Signed as free agent | Marcus Jensen | — | Philadelphia Phillies | Free agent signing |
| Jan 20, 2003 | Signed as free agent | Brian Moehler | — | Houston Astros | Free agent signing |
| Jan 20, 2003 | Signed as free agent | Jim Parque | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 20, 2003 | Signed as free agent | Ismael Valdez | — | Texas Rangers | Free agent signing |
| Jan 19, 2003 | Signed as free agent | Mike Kelly | — | Kansas City Royals | Free agent signing |
| Jan 18, 2003 | Signed | Ernesto Frieri | — | San Diego Padres | Amateur free agent signing |
| Jan 18, 2003 | Signed as free agent | Gerald Williams | — | Florida Marlins | Free agent signing |
| Jan 17, 2003 | Signed as free agent | McKay Christensen | — | Philadelphia Phillies | Free agent signing |
| Jan 17, 2003 | Signed as free agent | John Halama | — | Oakland Athletics | Free agent signing |
| Jan 17, 2003 | Signed as free agent | Doug Nickle | — | Anaheim Angels | Free agent signing |
| Jan 17, 2003 | Signed as free agent | Tike Redman | — | Pittsburgh Pirates | Free agent signing |
| Jan 17, 2003 | Signed as free agent | Luis Saturria | — | Colorado Rockies | Free agent signing |
| Jan 17, 2003 | Signed as free agent | Chuck Smith | — | Milwaukee Brewers | Free agent signing |
| Jan 17, 2003 | Signed as free agent | Rob Stanifer | — | Chicago Cubs | Free agent signing |
| Jan 17, 2003 | Signed as free agent | Ryan Thompson | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 17, 2003 | Signed as free agent | Ed Yarnall | — | Oakland Athletics | Free agent signing |
| Jan 16, 2003 | Signed as free agent | Marlon Anderson | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 16, 2003 | Signed as free agent | Ryan Christenson | — | Texas Rangers | Free agent signing |
| Jan 16, 2003 | Signed as free agent | Tom Evans | — | Detroit Tigers | Free agent signing |
| Jan 16, 2003 | Signed as free agent | John Flaherty | — | New York Yankees | Free agent signing |
| Jan 16, 2003 | Signed as free agent | Tom Goodwin | — | Chicago Cubs | Free agent signing |
| Jan 16, 2003 | Signed as free agent | Kerry Ligtenberg | — | Baltimore Orioles | Free agent signing |
| Jan 16, 2003 | Signed as free agent | Sean Lowe | — | Kansas City Royals | Free agent signing |
| Jan 16, 2003 | Signed as free agent | John Mabry | — | Seattle Mariners | Free agent signing |
| Jan 16, 2003 | Signed | Guillermo Moscoso | — | Detroit Tigers | Amateur free agent signing |
| Jan 16, 2003 | Signed as free agent | Steve Parris | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 16, 2003 | Signed as free agent | Calvin Pickering | — | Seattle Mariners | Free agent signing |
| Jan 15, 2003 | Signed as free agent | Jimmy Anderson | — | Cincinnati Reds | Free agent signing |
| Jan 15, 2003 | Signed as free agent | Rolando Arrojo | — | Pittsburgh Pirates | Free agent signing |
| Jan 15, 2003 | Signed as free agent | Alberto Castillo | — | St. Louis Cardinals | Free agent signing |
| Jan 15, 2003 | Signed as free agent | Tyler Houston | — | Philadelphia Phillies | Free agent signing |
| Jan 15, 2003 | Signed as free agent | Armando Rios | — | Chicago White Sox | Free agent signing |
| Jan 15, 2003 | Signed as free agent | Jason Ryan | — | St. Louis Cardinals | Free agent signing |
| Jan 15, 2003 | Trade | Antonio Osuna | Chicago White Sox | New York Yankees | Trade |
| Jan 15, 2003 | Trade | Eddi Candelario | Chicago White Sox | New York Yankees | Trade |
| Jan 15, 2003 | Trade | Orlando Hernandez | New York Yankees | Chicago White Sox | Trade |
| Jan 15, 2003 | Trade | Unnamed | Chicago White Sox | Montreal Expos | $ |
| Jan 15, 2003 | Trade | Rocky Biddle | Chicago White Sox | Montreal Expos | Trade |
| Jan 15, 2003 | Trade | Orlando Hernandez | Chicago White Sox | Montreal Expos | Trade |
| Jan 15, 2003 | Trade | Jeff Liefer | Chicago White Sox | Montreal Expos | Trade |
| Jan 15, 2003 | Trade | Bartolo Colon | Montreal Expos | Chicago White Sox | Trade |
| Jan 15, 2003 | Trade | Jorge Nunez | Montreal Expos | Chicago White Sox | Trade |
| Jan 14, 2003 | Signed as free agent | Ryan Glynn | — | Atlanta Braves | Free agent signing |
| Jan 14, 2003 | Signed as free agent | Kent Mercker | — | Cincinnati Reds | Free agent signing |
| Jan 14, 2003 | Signed as free agent | Keith Osik | — | Milwaukee Brewers | Free agent signing |
| Jan 14, 2003 | Signed as free agent | Todd Ritchie | — | Milwaukee Brewers | Free agent signing |
| Jan 14, 2003 | Signed as free agent | Shane Spencer | — | Cleveland Indians | Free agent signing |
| Jan 14, 2003 | Signed as free agent | Joe Vitiello | — | San Francisco Giants | Free agent signing |
| Jan 13, 2003 | Signed as free agent | Pedro Borbon | — | Los Angeles Dodgers | Free agent signing |
| Jan 13, 2003 | Signed as free agent | Midre Cummings | — | Chicago Cubs | Free agent signing |
| Jan 13, 2003 | Signed as free agent | Marty Malloy | — | Los Angeles Dodgers | Free agent signing |
| Jan 13, 2003 | Released | Paul Rigdon | Milwaukee Brewers | — | Release |
| Jan 13, 2003 | Signed as free agent | Jim Rushford | — | Texas Rangers | Free agent signing |
| Jan 13, 2003 | Signed as free agent | Aaron Small | — | Chicago Cubs | Free agent signing |
| Jan 13, 2003 | Signed as free agent | Mike Venafro | — | Atlanta Braves | Free agent signing |
| Jan 12, 2003 | Signed as free agent | Carlos Maldonado | — | Chicago White Sox | Free agent signing |
| Jan 12, 2003 | Signed as free agent | Paul Wilson | — | Cincinnati Reds | Free agent signing |
| Jan 11, 2003 | Signed as free agent | Tsuyoshi Shinjo | — | New York Mets | Free agent signing |
| Jan 11, 2003 | Trade | Gary Knotts | Florida Marlins | Detroit Tigers | Trade |
| Jan 11, 2003 | Trade | Nate Robertson | Florida Marlins | Detroit Tigers | Trade |
| Jan 11, 2003 | Trade | Rob Henkel | Florida Marlins | Detroit Tigers | Trade |
| Jan 11, 2003 | Trade | Mark Redman | Detroit Tigers | Florida Marlins | Trade |
| Jan 11, 2003 | Trade | Jerrod Fuell | Detroit Tigers | Florida Marlins | Trade |
| Jan 10, 2003 | Signed as free agent | Mike Buddie | — | Milwaukee Brewers | Free agent signing |
| Jan 10, 2003 | Signed as free agent | Jacob Cruz | — | Cincinnati Reds | Free agent signing |
| Jan 10, 2003 | Signed as free agent | Wilton Guerrero | — | Cincinnati Reds | Free agent signing |
| Jan 10, 2003 | Signed as free agent | Danny Klassen | — | Detroit Tigers | Free agent signing |
| Jan 10, 2003 | Signed as free agent | Bill Mueller | — | Boston Red Sox | Free agent signing |
| Jan 10, 2003 | Signed as free agent | Desi Relaford | — | Kansas City Royals | Free agent signing |
| Jan 9, 2003 | Signed as free agent | Mike Difelice | — | Kansas City Royals | Free agent signing |
| Jan 9, 2003 | Signed as free agent | Cliff Floyd | — | New York Mets | Free agent signing |
| Jan 9, 2003 | Signed as free agent | Chris Gomez | — | Minnesota Twins | Free agent signing |
| Jan 9, 2003 | Signed as free agent | Damon Hollins | — | Atlanta Braves | Free agent signing |
| Jan 8, 2003 | Signed as free agent | Scott Elarton | — | Colorado Rockies | Free agent signing |
| Jan 8, 2003 | Signed as free agent | Julio Franco | — | Atlanta Braves | Free agent signing |
| Jan 8, 2003 | Signed as free agent | Todd Hollandsworth | — | Florida Marlins | Free agent signing |
| Jan 8, 2003 | Signed as free agent | Felix Martinez | — | Chicago Cubs | Free agent signing |
| Jan 8, 2003 | Signed as free agent | Terry Mulholland | — | Cleveland Indians | Free agent signing |
| Jan 8, 2003 | Signed as free agent | Todd Pratt | — | Philadelphia Phillies | Free agent signing |
| Jan 8, 2003 | Signed as free agent | Chris Stynes | — | Colorado Rockies | Free agent signing |
| Jan 8, 2003 | Signed as free agent | Dave Veres | — | Chicago Cubs | Free agent signing |
| Jan 7, 2003 | Signed as free agent | Robinson Cancel | — | Detroit Tigers | Free agent signing |
| Jan 7, 2003 | Signed as free agent | Felix Heredia | — | Cincinnati Reds | Free agent signing |
| Jan 7, 2003 | Signed as free agent | Chad Kreuter | — | Texas Rangers | Free agent signing |
| Jan 7, 2003 | Signed as free agent | Albie Lopez | — | Kansas City Royals | Free agent signing |
| Jan 6, 2003 | Signed as free agent | Robert Fick | — | Atlanta Braves | Free agent signing |
| Jan 6, 2003 | Signed as free agent | Nate Field | — | Kansas City Royals | Free agent signing |
| Jan 6, 2003 | Signed as free agent | Nelson Figueroa | — | Pittsburgh Pirates | Free agent signing |
| Jan 6, 2003 | Signed as free agent | Brad Fullmer | — | Anaheim Angels | Free agent signing |
| Jan 6, 2003 | Signed as free agent | Joey Hamilton | — | St. Louis Cardinals | Free agent signing |
| Jan 6, 2003 | Signed as free agent | Al Levine | — | St. Louis Cardinals | Free agent signing |
| Jan 6, 2003 | Signed as free agent | Calvin Maduro | — | Los Angeles Dodgers | Free agent signing |
| Jan 6, 2003 | Signed as free agent | Wascar Serrano | — | Cincinnati Reds | Free agent signing |
| Jan 6, 2003 | Signed as free agent | Mike Timlin | — | Boston Red Sox | Free agent signing |
| Jan 6, 2003 | Signed as free agent | Chris Truby | — | Tampa Bay Devil Rays | Free agent signing |
| Jan 3, 2003 | Signed as free agent | Andy Abad | — | Boston Red Sox | Free agent signing |
| Jan 3, 2003 | Signed as free agent | Greg Colbrunn | — | Seattle Mariners | Free agent signing |
| Jan 3, 2003 | Signed as free agent | Omar Daal | — | Baltimore Orioles | Free agent signing |
| Jan 3, 2003 | Released | Brandon Knight | New York Yankees | — | Release |
| Jan 3, 2003 | Signed as free agent | John Thomson | — | Texas Rangers | Free agent signing |
| Jan 2, 2003 | Signed as free agent | Rod Beck | — | Chicago Cubs | Free agent signing |
| Jan 2, 2003 | Signed as free agent | Mike Mahoney | — | Chicago Cubs | Free agent signing |
| Jan 2, 2003 | Signed as free agent | Ramon Martinez | — | Chicago Cubs | Free agent signing |
| Jan 2, 2003 | Signed as free agent | Ryan Minor | — | Los Angeles Dodgers | Free agent signing |
| Jan 2, 2003 | Signed as free agent | Nerio Rodriguez | — | St. Louis Cardinals | Free agent signing |
Every row is mapped onto the same trade / signing / release vocabulary the modern feed uses, with the era’s own type description kept on each row. Club names are the names of the day (the Boston Braves years, the Brooklyn Dodgers years), and each links to the franchise it is today. Some dates are only partially known or flagged approximate by the source; they are shown exactly as published, never completed to a fake precise day.