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The 1991 season’s official transaction log: 686 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 31, 1991 | Signed as free agent | Bob Walk | — | Pittsburgh Pirates | Free agent signing |
| Dec 28, 1991 | Signed as free agent | Kirk McCaskill | — | Chicago White Sox | Free agent signing |
| Dec 27, 1991 | Signed as free agent | Mike Kingery | — | Oakland Athletics | Free agent signing |
| Dec 26, 1991 | Signed as free agent | Tracy Woodson | — | St. Louis Cardinals | Free agent signing |
| Dec 23, 1991 | Signed as free agent | Shannon Penn | — | Detroit Tigers | Free agent signing |
| Dec 23, 1991 | Signed as free agent | Chico Walker | — | Chicago Cubs | Free agent signing |
| Dec 20, 1991 | Signed as free agent | Jose Bautista | — | Kansas City Royals | Free agent signing |
| Dec 20, 1991 | Signed as free agent | Todd Burns | — | Texas Rangers | Free agent signing |
| Dec 20, 1991 | Released | Dave Clark | Kansas City Royals | — | Release |
| Dec 20, 1991 | Signed as free agent | Jim Gantner | — | Milwaukee Brewers | Free agent signing |
| Dec 20, 1991 | Signed as free agent | Dan Gladden | — | Detroit Tigers | Free agent signing |
| Dec 20, 1991 | Signed as free agent | Blaise Ilsley | — | St. Louis Cardinals | Free agent signing |
| Dec 20, 1991 | Signed as free agent | Jeff McKnight | — | New York Mets | Free agent signing |
| Dec 20, 1991 | Signed as free agent | Willie Randolph | — | New York Mets | Free agent signing |
| Dec 19, 1991 | Signed as free agent | Tom Filer | — | New York Mets | Free agent signing |
| Dec 19, 1991 | Signed as free agent | Brian Harper | — | Minnesota Twins | Free agent signing |
| Dec 19, 1991 | Signed as free agent | Joe Hesketh | — | Boston Red Sox | Free agent signing |
| Dec 19, 1991 | Signed as free agent | Chris Jones | — | Houston Astros | Free agent signing |
| Dec 19, 1991 | Signed as free agent | Luis Lopez | — | Cleveland Indians | Free agent signing |
| Dec 19, 1991 | Signed as free agent | Steve Springer | — | New York Mets | Free agent signing |
| Dec 19, 1991 | Signed as free agent | Rick Sutcliffe | — | Baltimore Orioles | Free agent signing |
| Dec 19, 1991 | Signed as free agent | Mike Walker | — | Detroit Tigers | Free agent signing |
| Dec 19, 1991 | Signed as free agent | Dave Winfield | — | Toronto Blue Jays | Free agent signing |
| Dec 19, 1991 | Signed as free agent | Mike York | — | San Diego Padres | Free agent signing |
| Dec 18, 1991 | Signed as free agent | Mike Cook | — | St. Louis Cardinals | Free agent signing |
| Dec 18, 1991 | Signed as free agent | Jack Morris | — | Toronto Blue Jays | Free agent signing |
| Dec 18, 1991 | Signed as free agent | Mickey Weston | — | Philadelphia Phillies | Free agent signing |
| Dec 18, 1991 | Signed as free agent | Mitch Williams | — | Philadelphia Phillies | Free agent signing |
| Dec 17, 1991 | Signed as free agent | Bob Kipper | — | Minnesota Twins | Free agent signing |
| Dec 16, 1991 | Signed as free agent | Mike Campbell | — | Texas Rangers | Free agent signing |
| Dec 16, 1991 | Signed as free agent | Mario Diaz | — | Milwaukee Brewers | Free agent signing |
| Dec 16, 1991 | Signed as free agent | John Morris | — | California Angels | Free agent signing |
| Dec 16, 1991 | Signed as free agent | Junior Ortiz | — | Cleveland Indians | Free agent signing |
| Dec 16, 1991 | Signed as free agent | Ray Stephens | — | Philadelphia Phillies | Free agent signing |
| Dec 16, 1991 | Signed as free agent | Dickie Thon | — | Texas Rangers | Free agent signing |
| Dec 14, 1991 | Signed as free agent | Scott May | — | Chicago Cubs | Free agent signing |
| Dec 13, 1991 | Released | Chris Jones | Cincinnati Reds | — | Release |
| Dec 13, 1991 | Signed as free agent | Ron Jones | — | Cleveland Indians | Free agent signing |
| Dec 13, 1991 | Signed as free agent | Rodney McCray | — | New York Mets | Free agent signing |
| Dec 13, 1991 | Signed as free agent | Clay Parker | — | Seattle Mariners | Free agent signing |
| Dec 13, 1991 | Released | Kelvin Torve | New York Mets | — | Release |
| Dec 13, 1991 | Trade | Clyde Keller | St. Louis Cardinals | New York Mets | Trade |
| Dec 13, 1991 | Trade | Chuck Carr | New York Mets | St. Louis Cardinals | Trade |
| Dec 12, 1991 | Signed as free agent | Steve Buechele | — | Pittsburgh Pirates | Free agent signing |
| Dec 12, 1991 | Signed as free agent | Wayne Kirby | — | Cleveland Indians | Free agent signing |
| Dec 12, 1991 | Signed as free agent | Otis Nixon | — | Atlanta Braves | Free agent signing |
| Dec 12, 1991 | Signed as free agent | Eric Plunk | — | Toronto Blue Jays | Free agent signing |
| Dec 12, 1991 | Signed as free agent | Gus Polidor | — | Oakland Athletics | Free agent signing |
| Dec 11, 1991 | Signed as free agent | William Brennan | — | Detroit Tigers | Free agent signing |
| Dec 11, 1991 | Signed as free agent | Butch Davis | — | Toronto Blue Jays | Free agent signing |
| Dec 11, 1991 | Signed as free agent | Carlton Fisk | — | Chicago White Sox | Free agent signing |
| Dec 11, 1991 | Released | Yorkis Perez | Chicago Cubs | — | Release |
| Dec 11, 1991 | Trade | Todd Benzinger | Kansas City Royals | Los Angeles Dodgers | Trade |
| Dec 11, 1991 | Trade | Chris Gwynn | Los Angeles Dodgers | Kansas City Royals | Trade |
| Dec 11, 1991 | Trade | Domingo Mota | Los Angeles Dodgers | Kansas City Royals | Trade |
| Dec 11, 1991 | Trade | Bill Swift | Seattle Mariners | San Francisco Giants | Trade |
| Dec 11, 1991 | Trade | Michael Jackson | Seattle Mariners | San Francisco Giants | Trade |
| Dec 11, 1991 | Trade | Dave Burba | Seattle Mariners | San Francisco Giants | Trade |
| Dec 11, 1991 | Trade | Kevin Mitchell | San Francisco Giants | Seattle Mariners | Trade |
| Dec 11, 1991 | Trade | Mike Remlinger | San Francisco Giants | Seattle Mariners | Trade |
| Dec 11, 1991 | Trade | Kevin McReynolds | New York Mets | Kansas City Royals | Trade |
| Dec 11, 1991 | Trade | Gregg Jefferies | New York Mets | Kansas City Royals | Trade |
| Dec 11, 1991 | Trade | Keith Miller | New York Mets | Kansas City Royals | Trade |
| Dec 11, 1991 | Trade | Bret Saberhagen | Kansas City Royals | New York Mets | Trade |
| Dec 11, 1991 | Trade | Bill Pecota | Kansas City Royals | New York Mets | Trade |
| Dec 11, 1991 | Trade | Steve Rosenberg | San Diego Padres | New York Mets | Trade |
| Dec 11, 1991 | Trade | Jeff Gardner | New York Mets | San Diego Padres | Trade |
| Dec 11, 1991 | Trade | Storm Davis | Kansas City Royals | Baltimore Orioles | Trade |
| Dec 11, 1991 | Trade | Bob Melvin | Baltimore Orioles | Kansas City Royals | Trade |
| Dec 11, 1991 | Trade | Dale Sveum | Milwaukee Brewers | Philadelphia Phillies | Trade |
| Dec 11, 1991 | Trade | Bruce Ruffin | Philadelphia Phillies | Milwaukee Brewers | Trade |
| Dec 11, 1991 | Trade | Dave Martinez | Montreal Expos | Cincinnati Reds | Trade |
| Dec 11, 1991 | Trade | Scott Ruskin | Montreal Expos | Cincinnati Reds | Trade |
| Dec 11, 1991 | Trade | Willie Greene | Montreal Expos | Cincinnati Reds | Trade |
| Dec 11, 1991 | Trade | John Wetteland | Cincinnati Reds | Montreal Expos | Trade |
| Dec 11, 1991 | Trade | Bill Risley | Cincinnati Reds | Montreal Expos | Trade |
| Dec 10, 1991 | Signed as free agent | Dave Bergman | — | Detroit Tigers | Free agent signing |
| Dec 10, 1991 | Signed as free agent | Mariano Duncan | — | Philadelphia Phillies | Free agent signing |
| Dec 10, 1991 | Signed as free agent | Sergio Valdez | — | Montreal Expos | Free agent signing |
| Dec 10, 1991 | Signed as free agent | Don Wakamatsu | — | Los Angeles Dodgers | Free agent signing |
| Dec 10, 1991 | Signed as free agent | Dean Wilkins | — | Montreal Expos | Free agent signing |
| Dec 10, 1991 | Trade | Mike Fetters | California Angels | Milwaukee Brewers | Trade |
| Dec 10, 1991 | Trade | Glenn Carter | California Angels | Milwaukee Brewers | Trade |
| Dec 10, 1991 | Trade | Chuck Crim | Milwaukee Brewers | California Angels | Trade |
| Dec 10, 1991 | Trade | Rudy Seanez | Cleveland Indians | Los Angeles Dodgers | Trade |
| Dec 10, 1991 | Trade | Dennis Cook | Los Angeles Dodgers | Cleveland Indians | Trade |
| Dec 10, 1991 | Trade | Mike Christopher | Los Angeles Dodgers | Cleveland Indians | Trade |
| Dec 10, 1991 | Trade | Ben VanRyn | Montreal Expos | Los Angeles Dodgers | Trade |
| Dec 10, 1991 | Trade | Marc Griffin | Los Angeles Dodgers | Montreal Expos | Trade |
| Dec 10, 1991 | Trade | Kenny Lofton | Houston Astros | Cleveland Indians | Trade |
| Dec 10, 1991 | Trade | Dave Rohde | Houston Astros | Cleveland Indians | Trade |
| Dec 10, 1991 | Trade | Willie Blair | Cleveland Indians | Houston Astros | Trade |
| Dec 10, 1991 | Trade | Ed Taubensee | Cleveland Indians | Houston Astros | Trade |
| Dec 10, 1991 | Trade | Dave Gallagher | California Angels | New York Mets | Trade |
| Dec 10, 1991 | Trade | Hubie Brooks | New York Mets | California Angels | Trade |
| Dec 10, 1991 | Trade | Rico Rossy | Atlanta Braves | Kansas City Royals | Trade |
| Dec 10, 1991 | Trade | Bobby Moore | Kansas City Royals | Atlanta Braves | Trade |
| Dec 9, 1991 | Signed as free agent | Danny Cox | — | Philadelphia Phillies | Free agent signing |
| Dec 9, 1991 | Signed as free agent | Brian Fisher | — | Pittsburgh Pirates | Free agent signing |
| Dec 9, 1991 | Signed as free agent | Wally Joyner | — | Kansas City Royals | Free agent signing |
| Dec 9, 1991 | Signed as free agent | Carney Lansford | — | Oakland Athletics | Free agent signing |
| Dec 9, 1991 | Signed as free agent | Dave Leiper | — | Milwaukee Brewers | Free agent signing |
| Dec 9, 1991 | Signed as free agent | Eric Nolte | — | Milwaukee Brewers | Free agent signing |
| Dec 9, 1991 | Released | Rick Parker | San Francisco Giants | — | Release |
| Dec 9, 1991 | Released | Jeff Parrett | Atlanta Braves | — | Release |
| Dec 9, 1991 | Released | Nelson Santovenia | Montreal Expos | — | Release |
| Dec 9, 1991 | Trade | Craig Pueschner | San Diego Padres | Cincinnati Reds | Trade |
| Dec 9, 1991 | Trade | Unnamed | Philadelphia Phillies | Montreal Expos | $ |
| Dec 9, 1991 | Trade | Barry Jones | Montreal Expos | Philadelphia Phillies | Trade |
| Dec 9, 1991 | Trade | Darrin Fletcher | Philadelphia Phillies | Montreal Expos | Trade |
| Dec 9, 1991 | Trade | Jeff Barry | Montreal Expos | New York Mets | Trade |
| Dec 9, 1991 | Trade | Blaine Beatty | New York Mets | Montreal Expos | Trade |
| Dec 8, 1991 | Signed as free agent | Don August | — | San Francisco Giants | Free agent signing |
| Dec 8, 1991 | Trade | Kyle Abbott | California Angels | Philadelphia Phillies | Trade |
| Dec 8, 1991 | Trade | Ruben Amaro | California Angels | Philadelphia Phillies | Trade |
| Dec 8, 1991 | Trade | Von Hayes | Philadelphia Phillies | California Angels | Trade |
| Dec 8, 1991 | Trade | Bip Roberts | San Diego Padres | Cincinnati Reds | Trade |
| Dec 8, 1991 | Trade | Randy Myers | Cincinnati Reds | San Diego Padres | Trade |
| Dec 7, 1991 | Signed as free agent | Brian Downing | — | Texas Rangers | Free agent signing |
| Dec 7, 1991 | Signed as free agent | Dwight Evans | — | Baltimore Orioles | Free agent signing |
| Dec 7, 1991 | Signed as free agent | Geno Petralli | — | Texas Rangers | Free agent signing |
| Dec 6, 1991 | Signed as free agent | Chris Cron | — | Chicago White Sox | Free agent signing |
| Dec 6, 1991 | Signed as free agent | Brad Komminsk | — | Chicago White Sox | Free agent signing |
| Dec 6, 1991 | Signed as free agent | Ever Magallanes | — | Chicago White Sox | Free agent signing |
| Dec 6, 1991 | Signed as free agent | Mitch Webster | — | Los Angeles Dodgers | Free agent signing |
| Dec 5, 1991 | Signed as free agent | Tom Drees | — | Texas Rangers | Free agent signing |
| Dec 4, 1991 | Signed as free agent | Dan Pasqua | — | Chicago White Sox | Free agent signing |
| Dec 3, 1991 | Signed as free agent | Tom Candiotti | — | Los Angeles Dodgers | Free agent signing |
| Dec 3, 1991 | Signed as free agent | Orel Hershiser | — | Los Angeles Dodgers | Free agent signing |
| Dec 3, 1991 | Signed as free agent | Chuck Jackson | — | Texas Rangers | Free agent signing |
| Dec 3, 1991 | Signed as free agent | Mike Morgan | — | Chicago Cubs | Free agent signing |
| Dec 2, 1991 | Signed as free agent | Bobby Bonilla | — | New York Mets | Free agent signing |
| Dec 2, 1991 | Signed as free agent | Russ McGinnis | — | Texas Rangers | Free agent signing |
| Dec 2, 1991 | Signed as free agent | Erik Pappas | — | Kansas City Royals | Free agent signing |
| Nov 28, 1991 | Signed as free agent | Efrain Valdez | — | Milwaukee Brewers | Free agent signing |
| Nov 27, 1991 | Released | Jeff Manto | Cleveland Indians | — | Release |
| Nov 27, 1991 | Signed as free agent | Eddie Murray | — | New York Mets | Free agent signing |
| Nov 27, 1991 | Released | Mike Walker | Cleveland Indians | — | Release |
| Nov 27, 1991 | Trade | Tim Belcher | Los Angeles Dodgers | Cincinnati Reds | Trade |
| Nov 27, 1991 | Trade | John Wetteland | Los Angeles Dodgers | Cincinnati Reds | Trade |
| Nov 27, 1991 | Trade | Eric Davis | Cincinnati Reds | Los Angeles Dodgers | Trade |
| Nov 27, 1991 | Trade | Kip Gross | Cincinnati Reds | Los Angeles Dodgers | Trade |
| Nov 25, 1991 | Trade | Ken Hill | St. Louis Cardinals | Montreal Expos | Trade |
| Nov 25, 1991 | Trade | Andres Galarraga | Montreal Expos | St. Louis Cardinals | Trade |
| Nov 22, 1991 | Signed as free agent | Jose Mota | — | Kansas City Royals | Free agent signing |
| Nov 21, 1991 | Signed | Rene Arocha | — | St. Louis Cardinals | Amateur free agent signing |
| Nov 20, 1991 | Released | Jose Gonzalez | Cleveland Indians | — | Release |
| Nov 20, 1991 | Released | Dave Johnson | Baltimore Orioles | — | Release |
| Nov 20, 1991 | Released | Terry Lee | Cincinnati Reds | — | Release |
| Nov 20, 1991 | Signed as free agent | Tony Menendez | — | Cincinnati Reds | Free agent signing |
| Nov 20, 1991 | Released | Eric Plunk | New York Yankees | — | Release |
| Nov 20, 1991 | Released | Luis Quinones | Cincinnati Reds | — | Release |
| Nov 20, 1991 | Released | Randy St. Claire | Atlanta Braves | — | Release |
| Nov 19, 1991 | Released | John Costello | San Diego Padres | — | Release |
| Nov 18, 1991 | Released | Jim Corsi | Houston Astros | — | Release |
| Nov 18, 1991 | Released | Javier Ortiz | Houston Astros | — | Release |
| Nov 18, 1991 | Released | Jose Tolentino | Houston Astros | — | Release |
| Nov 18, 1991 | Released | Ken Williams | Montreal Expos | — | Release |
| Nov 15, 1991 | Signed as free agent | Troy Afenir | — | Cincinnati Reds | Free agent signing |
| Nov 15, 1991 | Trade | Earl Sanders | Atlanta Braves | Houston Astros | Trade |
| Nov 15, 1991 | Trade | Jack Armstrong | Cincinnati Reds | Cleveland Indians | Trade |
| Nov 15, 1991 | Trade | Scott Scudder | Cincinnati Reds | Cleveland Indians | Trade |
| Nov 15, 1991 | Trade | Joe Turek | Cincinnati Reds | Cleveland Indians | Trade |
| Nov 15, 1991 | Trade | Greg Swindell | Cleveland Indians | Cincinnati Reds | Trade |
| Nov 13, 1991 | Released | Chris Cron | California Angels | — | Release |
| Nov 13, 1991 | Signed | Ramiro Mendoza | — | New York Yankees | Amateur free agent signing |
| Nov 13, 1991 | Signed as free agent | Todd Pratt | — | Baltimore Orioles | Free agent signing |
| Nov 13, 1991 | Released | Jeff Robinson | Baltimore Orioles | — | Release |
| Nov 13, 1991 | Signed as free agent | Greg Tubbs | — | Pittsburgh Pirates | Free agent signing |
| Nov 13, 1991 | Signed as free agent | Eddie Zambrano | — | Pittsburgh Pirates | Free agent signing |
| Nov 13, 1991 | Trade | Mickey Pina | Boston Red Sox | Atlanta Braves | Trade |
| Nov 12, 1991 | Signed as free agent | Jacob Brumfield | — | Cincinnati Reds | Free agent signing |
| Nov 12, 1991 | Signed as free agent | Nick Capra | — | Cincinnati Reds | Free agent signing |
| Nov 12, 1991 | Signed as free agent | Darnell Coles | — | Cincinnati Reds | Free agent signing |
| Nov 12, 1991 | Signed as free agent | Glenn Davis | — | Baltimore Orioles | Free agent signing |
| Nov 12, 1991 | Signed as free agent | Gary Green | — | Cincinnati Reds | Free agent signing |
| Nov 12, 1991 | Signed as free agent | Russ Morman | — | Cincinnati Reds | Free agent signing |
| Nov 12, 1991 | Signed as free agent | Jeff Schulz | — | Cincinnati Reds | Free agent signing |
| Nov 12, 1991 | Released | Ray Stephens | St. Louis Cardinals | — | Release |
| Nov 12, 1991 | Signed as free agent | Rick Wrona | — | Cincinnati Reds | Free agent signing |
| Nov 11, 1991 | Signed as free agent | Al Martin | — | Pittsburgh Pirates | Free agent signing |
| Nov 7, 1991 | Signed as free agent | John Cangelosi | — | Texas Rangers | Free agent signing |
| Nov 5, 1991 | Released | Erik Pappas | Chicago Cubs | — | Release |
| Nov 1, 1991 | Released | Donnie Hill | California Angels | — | Release |
| Nov 1, 1991 | Released | Larry Sheets | California Angels | — | Release |
| Oct 31, 1991 | Signed as free agent | Geronimo Berroa | — | Cincinnati Reds | Free agent signing |
| Oct 30, 1991 | Signed as free agent | Mark Huismann | — | Kansas City Royals | Free agent signing |
| Oct 28, 1991 | Released | Chuck Cary | New York Yankees | — | Release |
| Oct 28, 1991 | Signed as free agent | Steve Fireovid | — | Texas Rangers | Free agent signing |
| Oct 28, 1991 | Released | Cory Snyder | Toronto Blue Jays | — | Release |
| Oct 25, 1991 | Released | Greg Mathews | Milwaukee Brewers | — | Release |
| Oct 24, 1991 | Released | Barry Lyons | California Angels | — | Release |
| Oct 21, 1991 | Signed | Manny Aybar | — | St. Louis Cardinals | Amateur free agent signing |
| Oct 21, 1991 | Signed | Geremi Gonzalez | — | Chicago Cubs | Amateur free agent signing |
| Oct 21, 1991 | Signed | Jose Jimenez | — | St. Louis Cardinals | Amateur free agent signing |
| Oct 16, 1991 | Released | Paul Kilgus | Baltimore Orioles | — | Release |
| Oct 15, 1991 | Released | Pat Sheridan | New York Yankees | — | Release |
| Oct 15, 1991 | Trade | Alex Diaz | Montreal Expos | Milwaukee Brewers | Trade |
| Oct 15, 1991 | Trade | George Canale | Milwaukee Brewers | Montreal Expos | Trade |
| Oct 14, 1991 | Signed as free agent | Mark Bailey | — | San Francisco Giants | Free agent signing |
| Oct 14, 1991 | Released | Jamie Moyer | St. Louis Cardinals | — | Release |
| Oct 14, 1991 | Signed as free agent | Larry Sheets | — | California Angels | Free agent signing |
| Oct 11, 1991 | Released | Vance Law | Oakland Athletics | — | Release |
| Oct 9, 1991 | Released | Rick Dempsey | Milwaukee Brewers | — | Release |
| Oct 9, 1991 | Released | Dave Schmidt | Texas Rangers | — | Release |
| Oct 8, 1991 | Signed | Wilton Guerrero | — | Los Angeles Dodgers | Amateur free agent signing |
| Oct 7, 1991 | Released | Mike York | Cleveland Indians | — | Release |
| Oct 6, 1991 | Released | Tom Herr | San Francisco Giants | — | Release |
| Oct 6, 1991 | Released | Mike Kingery | San Francisco Giants | — | Release |
| Sep 29, 1991 | Trade | Turk Wendell | Atlanta Braves | Chicago Cubs | Trade |
| Sep 29, 1991 | Trade | Yorkis Perez | Atlanta Braves | Chicago Cubs | Trade |
| Sep 29, 1991 | Trade | Mike Bielecki | Chicago Cubs | Atlanta Braves | Trade |
| Sep 29, 1991 | Trade | Damon Berryhill | Chicago Cubs | Atlanta Braves | Trade |
| Sep 28, 1991 | Signed | Alejandro Freire | — | Houston Astros | Amateur free agent signing |
| Sep 25, 1991 | Released | Mike Birkbeck | Cleveland Indians | — | Release |
| Sep 20, 1991 | Released | Rich Renteria | Montreal Expos | — | Release |
| Sep 14, 1991 | Signed as free agent | Dave Parker | — | Toronto Blue Jays | Free agent signing |
| Sep 10, 1991 | Released | Fernando Valenzuela | California Angels | — | Release |
| Sep 9, 1991 | Signed | Calvin Maduro | — | Baltimore Orioles | Amateur free agent signing |
| Sep 7, 1991 | Released | Dave Parker | California Angels | — | Release |
| Sep 6, 1991 | Trade | Hector Fajardo | Pittsburgh Pirates | Texas Rangers | Trade |
| Sep 6, 1991 | Trade | Steve Wilson | Chicago Cubs | Los Angeles Dodgers | Trade |
| Sep 6, 1991 | Trade | Jeff Hartsock | Los Angeles Dodgers | Chicago Cubs | Trade |
| Sep 5, 1991 | Released | Scott May | Chicago Cubs | — | Release |
| Sep 5, 1991 | Released | Dave Pavlas | Chicago Cubs | — | Release |
| Sep 5, 1991 | Trade | Tony Beasley | Baltimore Orioles | Pittsburgh Pirates | Trade |
| Sep 4, 1991 | Trade | Steve Wapnick | Toronto Blue Jays | Chicago White Sox | Trade |
| Sep 1, 1991 | Trade | Travis Buckley | Texas Rangers | Montreal Expos | Trade |
| Aug 30, 1991 | Signed as free agent | Kevin Hickey | — | San Francisco Giants | Free agent signing |
| Aug 30, 1991 | Trade | Kurt Miller | Pittsburgh Pirates | Texas Rangers | Trade |
| Aug 30, 1991 | Trade | Steve Buechele | Texas Rangers | Pittsburgh Pirates | Trade |
| Aug 29, 1991 | Released | Floyd Bannister | California Angels | — | Release |
| Aug 29, 1991 | Trade | Joe Roa | Atlanta Braves | New York Mets | Trade |
| Aug 28, 1991 | Trade | Tony Castillo | Atlanta Braves | New York Mets | Trade |
| Aug 28, 1991 | Trade | Alejandro Peña | New York Mets | Atlanta Braves | Trade |
| Aug 25, 1991 | Released | John Moses | Detroit Tigers | — | Release |
| Aug 24, 1991 | Trade | Richie Lewis | Montreal Expos | Baltimore Orioles | Trade |
| Aug 24, 1991 | Trade | Chris Myers | Baltimore Orioles | Montreal Expos | Trade |
| Aug 20, 1991 | Released | Andy Hawkins | Oakland Athletics | — | Release |
| Aug 16, 1991 | Trade | Dan Petry | Atlanta Braves | Boston Red Sox | Trade |
| Aug 15, 1991 | Signed as free agent | Tom Herr | — | San Francisco Giants | Free agent signing |
| Aug 15, 1991 | Released | Ron Kittle | Chicago White Sox | — | Release |
| Aug 14, 1991 | Signed as free agent | Rich Renteria | — | Montreal Expos | Free agent signing |
| Aug 14, 1991 | Trade | William Suero | Toronto Blue Jays | Milwaukee Brewers | Trade |
| Aug 14, 1991 | Released | Mike Davis | Montreal Expos | — | Release |
| Aug 13, 1991 | Released | John Shelby | Detroit Tigers | — | Release |
| Aug 12, 1991 | Signed as free agent | Greg Brock | — | Chicago White Sox | Free agent signing |
| Aug 9, 1991 | Released | Kevin Romine | Boston Red Sox | — | Release |
| Aug 9, 1991 | Trade | Bob Wishnevski | Toronto Blue Jays | Milwaukee Brewers | Trade |
| Aug 9, 1991 | Trade | Candy Maldonado | Milwaukee Brewers | Toronto Blue Jays | Trade |
| Aug 8, 1991 | Released | Wes Gardner | Kansas City Royals | — | Release |
| Aug 8, 1991 | Signed | Marty Janzen | — | New York Yankees | Amateur free agent signing |
| Aug 8, 1991 | Released | Rick Mahler | Atlanta Braves | — | Release |
| Aug 8, 1991 | Signed as free agent | Dave Schmidt | — | Texas Rangers | Free agent signing |
| Aug 8, 1991 | Signed as free agent | Jeff Tabaka | — | Milwaukee Brewers | Free agent signing |
| Aug 7, 1991 | Released | Mike Marshall | California Angels | — | Release |
| Aug 5, 1991 | Signed | Mark Acre | — | Oakland Athletics | Amateur free agent signing |
| Aug 5, 1991 | Released | Tom Herr | New York Mets | — | Release |
| Aug 5, 1991 | Released | John Moses | Pittsburgh Pirates | — | Release |
| Aug 5, 1991 | Signed as free agent | John Moses | — | Detroit Tigers | Free agent signing |
| Aug 4, 1991 | Signed as free agent | Andy McGaffigan | — | Milwaukee Brewers | Free agent signing |
| Aug 2, 1991 | Signed as free agent | Don Carman | — | Kansas City Royals | Free agent signing |
| Aug 2, 1991 | Released | Rich Renteria | Detroit Tigers | — | Release |
| Aug 2, 1991 | Released | Dave Schmidt | Montreal Expos | — | Release |
| Aug 2, 1991 | Trade | Lynn Carlson | Pittsburgh Pirates | San Diego Padres | Trade |
| Aug 2, 1991 | Trade | Brian Dorsett | San Diego Padres | Pittsburgh Pirates | Trade |
| Aug 1, 1991 | Signed as free agent | John Moses | — | Pittsburgh Pirates | Free agent signing |
| Jul 31, 1991 | Trade | Matt Turner | Atlanta Braves | Houston Astros | Trade |
| Jul 31, 1991 | Trade | Jim Clancy | Houston Astros | Atlanta Braves | Trade |
| Jul 31, 1991 | Trade | Matt Grott | Oakland Athletics | Montreal Expos | Trade |
| Jul 31, 1991 | Trade | Russ Cormier | Oakland Athletics | Montreal Expos | Trade |
| Jul 31, 1991 | Trade | Ron Darling | Montreal Expos | Oakland Athletics | Trade |
| Jul 31, 1991 | Trade | Mike Hartley | Los Angeles Dodgers | Philadelphia Phillies | Trade |
| Jul 31, 1991 | Trade | Braulio Castillo | Los Angeles Dodgers | Philadelphia Phillies | Trade |
| Jul 31, 1991 | Trade | Roger McDowell | Philadelphia Phillies | Los Angeles Dodgers | Trade |
| Jul 30, 1991 | Released | Rod Booker | Philadelphia Phillies | — | Release |
| Jul 30, 1991 | Trade | Jack Howell | California Angels | San Diego Padres | Trade |
| Jul 30, 1991 | Trade | Shawn Abner | San Diego Padres | California Angels | Trade |
| Jul 29, 1991 | Released | Jose Escobar | Cleveland Indians | — | Release |
| Jul 28, 1991 | Released | Oddibe McDowell | Baltimore Orioles | — | Release |
| Jul 27, 1991 | Signed as free agent | Mike Marshall | — | California Angels | Free agent signing |
| Jul 27, 1991 | Released | Ken Oberkfell | Houston Astros | — | Release |
| Jul 26, 1991 | Released | Jeff Tabaka | Philadelphia Phillies | — | Release |
| Jul 26, 1991 | Trade | Lee Tinsley | Oakland Athletics | Cleveland Indians | Trade |
| Jul 26, 1991 | Trade | Apolinar Garcia | Oakland Athletics | Cleveland Indians | Trade |
| Jul 26, 1991 | Trade | Brook Jacoby | Cleveland Indians | Oakland Athletics | Trade |
| Jul 22, 1991 | Signed | Eric Weaver | — | Los Angeles Dodgers | Amateur free agent signing |
| Jul 21, 1991 | Signed | Ricky Bottalico | — | Philadelphia Phillies | Amateur free agent signing |
| Jul 21, 1991 | Released | Mike Marshall | Boston Red Sox | — | Release |
| Jul 21, 1991 | Trade | Jonathan Hurst | Texas Rangers | Montreal Expos | Trade |
| Jul 21, 1991 | Trade | Joey Eischen | Texas Rangers | Montreal Expos | Trade |
| Jul 21, 1991 | Trade | Oil Can Boyd | Montreal Expos | Texas Rangers | Trade |
| Jul 19, 1991 | Signed as free agent | Doug Davis | — | Kansas City Royals | Free agent signing |
| Jul 19, 1991 | Released | John Moses | Cleveland Indians | — | Release |
| Jul 18, 1991 | Released | Don Carman | Cincinnati Reds | — | Release |
| Jul 18, 1991 | Signed as free agent | Stan Jefferson | — | Cincinnati Reds | Free agent signing |
| Jul 18, 1991 | Signed as free agent | Jim Presley | — | Texas Rangers | Free agent signing |
| Jul 16, 1991 | Released | Andy McGaffigan | Kansas City Royals | — | Release |
| Jul 15, 1991 | Released | Doug Davis | California Angels | — | Release |
| Jul 15, 1991 | Released | Dave Leiper | California Angels | — | Release |
| Jul 15, 1991 | Signed as free agent | Steve Searcy | — | Philadelphia Phillies | Free agent signing |
| Jul 15, 1991 | Trade | Tim Burke | Montreal Expos | New York Mets | Trade |
| Jul 15, 1991 | Trade | Ron Darling | New York Mets | Montreal Expos | Trade |
| Jul 15, 1991 | Trade | Mike Thomas | New York Mets | Montreal Expos | Trade |
| Jul 14, 1991 | Trade | Shawn Jeter | Toronto Blue Jays | Chicago White Sox | Trade |
| Jul 14, 1991 | Trade | Cory Snyder | Chicago White Sox | Toronto Blue Jays | Trade |
| Jul 11, 1991 | Released | Kevin Hickey | Baltimore Orioles | — | Release |
| Jul 11, 1991 | Signed | Tomas Perez | — | Montreal Expos | Amateur free agent signing |
| Jul 11, 1991 | Trade | Carmelo Martinez | Kansas City Royals | Cincinnati Reds | Trade |
| Jul 11, 1991 | Trade | Todd Benzinger | Cincinnati Reds | Kansas City Royals | Trade |
| Jul 10, 1991 | Signed as free agent | Fernando Valenzuela | — | California Angels | Free agent signing |
| Jul 10, 1991 | Released | Ed Vosberg | Seattle Mariners | — | Release |
| Jul 8, 1991 | Trade | Eric Stone | Detroit Tigers | Cleveland Indians | Trade |
| Jul 5, 1991 | Released | Stan Jefferson | Cleveland Indians | — | Release |
| Jul 5, 1991 | Signed as free agent | Mark McLemore | — | Baltimore Orioles | Free agent signing |
| Jul 5, 1991 | Released | Fernando Valenzuela | California Angels | — | Release |
| Jul 5, 1991 | Released | Ernie Whitt | Baltimore Orioles | — | Release |
| Jul 4, 1991 | Released | Mike Cook | Seattle Mariners | — | Release |
| Jul 4, 1991 | Signed as free agent | James Hurst | — | Texas Rangers | Free agent signing |
| Jul 4, 1991 | Released | Shannon Penn | Texas Rangers | — | Release |
| Jul 3, 1991 | Released | Greg Brock | Milwaukee Brewers | — | Release |
| Jul 3, 1991 | Released | Mike LaCoss | San Francisco Giants | — | Release |
| Jul 3, 1991 | Trade | Jose Gonzalez | Los Angeles Dodgers | Pittsburgh Pirates | Trade |
| Jul 3, 1991 | Trade | Mitch Webster | Pittsburgh Pirates | Los Angeles Dodgers | Trade |
| Jul 2, 1991 | Signed | Richard Hidalgo | — | Houston Astros | Amateur free agent signing |
| Jul 1, 1991 | Signed | Alex Ramirez | — | Cleveland Indians | Amateur free agent signing |
| Jun 29, 1991 | Signed | Jason Christiansen | — | Pittsburgh Pirates | Amateur free agent signing |
| Jun 28, 1991 | Signed as free agent | Dave LaPoint | — | Chicago Cubs | Free agent signing |
| Jun 27, 1991 | Trade | Unnamed | Toronto Blue Jays | Cleveland Indians | $ |
| Jun 27, 1991 | Trade | Denis Boucher | Toronto Blue Jays | Cleveland Indians | Trade |
| Jun 27, 1991 | Trade | Glenallen Hill | Toronto Blue Jays | Cleveland Indians | Trade |
| Jun 27, 1991 | Trade | Mark Whiten | Toronto Blue Jays | Cleveland Indians | Trade |
| Jun 27, 1991 | Trade | Tom Candiotti | Cleveland Indians | Toronto Blue Jays | Trade |
| Jun 27, 1991 | Trade | Turner Ward | Cleveland Indians | Toronto Blue Jays | Trade |
| Jun 26, 1991 | Signed as free agent | Wes Gardner | — | Kansas City Royals | Free agent signing |
| Jun 26, 1991 | Trade | Robert Person | Cleveland Indians | Chicago White Sox | Trade |
| Jun 26, 1991 | Trade | Grady Hall | Chicago White Sox | Cleveland Indians | Trade |
| Jun 26, 1991 | Trade | David Rosario | Chicago Cubs | New York Yankees | Trade |
| Jun 26, 1991 | Trade | Steve Adkins | New York Yankees | Chicago Cubs | Trade |
| Jun 25, 1991 | Released | Mark McLemore | Houston Astros | — | Release |
| Jun 25, 1991 | Trade | Victor Rosario | Atlanta Braves | Detroit Tigers | Trade |
| Jun 25, 1991 | Trade | Dan Petry | Detroit Tigers | Atlanta Braves | Trade |
| Jun 24, 1991 | Signed as free agent | Bob McClure | — | St. Louis Cardinals | Free agent signing |
| Jun 23, 1991 | Released | Dave LaPoint | Milwaukee Brewers | — | Release |
| Jun 22, 1991 | Signed as free agent | Randy Kramer | — | Seattle Mariners | Free agent signing |
| Jun 22, 1991 | Released | Denny Walling | Texas Rangers | — | Release |
| Jun 22, 1991 | Trade | Jim Blueberg | Seattle Mariners | New York Yankees | Trade |
| Jun 21, 1991 | Signed as free agent | William Brennan | — | Montreal Expos | Free agent signing |
| Jun 21, 1991 | Signed | Carlos Reyes | — | Atlanta Braves | Amateur free agent signing |
| Jun 20, 1991 | Signed as free agent | Mark Huismann | — | Kansas City Royals | Free agent signing |
| Jun 19, 1991 | Signed as free agent | Ron Kittle | — | Chicago White Sox | Free agent signing |
| Jun 19, 1991 | Released | Randy Kramer | Atlanta Braves | — | Release |
| Jun 19, 1991 | Signed as free agent | Barry Lyons | — | California Angels | Free agent signing |
| Jun 19, 1991 | Released | Rick Reuschel | San Francisco Giants | — | Release |
| Jun 19, 1991 | Signed as free agent | Randy Veres | — | San Francisco Giants | Free agent signing |
| Jun 18, 1991 | Signed | Juan Castro | — | Los Angeles Dodgers | Amateur free agent signing |
| Jun 18, 1991 | Released | Rick Wrona | Texas Rangers | — | Release |
| Jun 17, 1991 | Released | Danny Heep | Atlanta Braves | — | Release |
| Jun 17, 1991 | Signed | Chuck Smith | — | Houston Astros | Amateur free agent signing |
| Jun 17, 1991 | Signed | Terrell Wade | — | Atlanta Braves | Amateur free agent signing |
| Jun 16, 1991 | Released | Bob McClure | California Angels | — | Release |
| Jun 16, 1991 | Released | Dan Schatzeder | New York Mets | — | Release |
| Jun 14, 1991 | Released | Marty Barrett | San Diego Padres | — | Release |
| Jun 14, 1991 | Signed as free agent | Rick Mahler | — | Atlanta Braves | Free agent signing |
| Jun 14, 1991 | Signed | Ismael Valdez | — | Los Angeles Dodgers | Amateur free agent signing |
| Jun 14, 1991 | Trade | Tim Costo | Cleveland Indians | Cincinnati Reds | Trade |
| Jun 14, 1991 | Trade | Reggie Jefferson | Cincinnati Reds | Cleveland Indians | Trade |
| Jun 12, 1991 | Signed | Antonio Osuna | — | Los Angeles Dodgers | Amateur free agent signing |
| Jun 12, 1991 | Released | Randy Veres | Atlanta Braves | — | Release |
| Jun 11, 1991 | Signed | Jose Alberro | — | Texas Rangers | Amateur free agent signing |
| Jun 11, 1991 | Released | Mark Huismann | Pittsburgh Pirates | — | Release |
| Jun 11, 1991 | Signed as free agent | Jeff Kaiser | — | Detroit Tigers | Free agent signing |
| Jun 10, 1991 | Signed | Heath Haynes | — | Montreal Expos | Amateur free agent signing |
| Jun 10, 1991 | Released | Rick Mahler | Montreal Expos | — | Release |
| Jun 10, 1991 | Signed | Jeff Pierce | — | Chicago White Sox | Amateur free agent signing |
| Jun 10, 1991 | Signed | Brad Woodall | — | Atlanta Braves | Amateur free agent signing |
| Jun 10, 1991 | Trade | Gus Polidor | Milwaukee Brewers | Oakland Athletics | Trade |
| Jun 10, 1991 | Trade | Trent Weaver | Oakland Athletics | Milwaukee Brewers | Trade |
| Jun 9, 1991 | Released | Terry Puhl | Kansas City Royals | — | Release |
| Jun 8, 1991 | Released | Jim Presley | San Diego Padres | — | Release |
| Jun 7, 1991 | Released | Glenn Wilson | Atlanta Braves | — | Release |
| Jun 6, 1991 | Signed as free agent | Dan Schatzeder | — | New York Mets | Free agent signing |
| Jun 3, 1991 | Trade | Keith Morrison | Atlanta Braves | Montreal Expos | Trade |
| Jun 2, 1991 | Signed as free agent | Steve Balboni | — | Texas Rangers | Free agent signing |
| Jun 2, 1991 | Released | Fred Manrique | Oakland Athletics | — | Release |
| May 31, 1991 | Released | Wes Gardner | San Diego Padres | — | Release |
| May 31, 1991 | Trade | Tim Teufel | New York Mets | San Diego Padres | Trade |
| May 31, 1991 | Trade | Garry Templeton | San Diego Padres | New York Mets | Trade |
| May 29, 1991 | Signed | Ramon Morel | — | Pittsburgh Pirates | Amateur free agent signing |
| May 29, 1991 | Released | Dan Schatzeder | Kansas City Royals | — | Release |
| May 27, 1991 | Signed as free agent | Dwayne Hosey | — | Milwaukee Brewers | Free agent signing |
| May 25, 1991 | Signed as free agent | Carmelo Castillo | — | Milwaukee Brewers | Free agent signing |
| May 23, 1991 | Signed | Bubba Carpenter | — | New York Yankees | Amateur free agent signing |
| May 23, 1991 | Signed as free agent | Eric Nolte | — | Texas Rangers | Free agent signing |
| May 23, 1991 | Signed | Amaury Telemaco | — | Chicago Cubs | Amateur free agent signing |
| May 23, 1991 | Trade | Esteban Beltre | Milwaukee Brewers | Chicago White Sox | Trade |
| May 23, 1991 | Trade | John Cangelosi | Chicago White Sox | Milwaukee Brewers | Trade |
| May 22, 1991 | Signed as free agent | Mike Dunne | — | Chicago White Sox | Free agent signing |
| May 21, 1991 | Trade | Steve Cummings | Cleveland Indians | Detroit Tigers | Trade |
| May 20, 1991 | Signed | Oscar Henriquez | — | Houston Astros | Amateur free agent signing |
| May 20, 1991 | Released | Dwayne Hosey | Oakland Athletics | — | Release |
| May 20, 1991 | Released | Eric Nolte | San Diego Padres | — | Release |
| May 20, 1991 | Signed as free agent | Fernando Valenzuela | — | California Angels | Free agent signing |
| May 20, 1991 | Signed as free agent | Ed Vosberg | — | Seattle Mariners | Free agent signing |
| May 19, 1991 | Signed as free agent | Greg Mathews | — | Milwaukee Brewers | Free agent signing |
| May 18, 1991 | Signed as free agent | Andy Hawkins | — | Oakland Athletics | Free agent signing |
| May 18, 1991 | Signed | Magglio Ordonez | — | Chicago White Sox | Amateur free agent signing |
| May 17, 1991 | Signed as free agent | Mike Aldrete | — | Cleveland Indians | Free agent signing |
| May 17, 1991 | Trade | Unnamed | Seattle Mariners | New York Yankees | $ |
| May 17, 1991 | Trade | Mike Blowers | New York Yankees | Seattle Mariners | Trade |
| May 16, 1991 | Signed | Freddy Garcia | — | Toronto Blue Jays | Amateur free agent signing |
| May 16, 1991 | Signed | Julio Mosquera | — | Toronto Blue Jays | Amateur free agent signing |
| May 16, 1991 | Trade | Mike York | Pittsburgh Pirates | Cleveland Indians | Trade |
| May 16, 1991 | Trade | Mitch Webster | Cleveland Indians | Pittsburgh Pirates | Trade |
| May 15, 1991 | Signed as free agent | Jay Baller | — | Philadelphia Phillies | Free agent signing |
| May 14, 1991 | Signed as free agent | Mark Ettles | — | San Diego Padres | Free agent signing |
| May 13, 1991 | Signed as free agent | Tony Menendez | — | Texas Rangers | Free agent signing |
| May 13, 1991 | Signed as free agent | Rick Wrona | — | Texas Rangers | Free agent signing |
| May 11, 1991 | Released | Ed Vosberg | California Angels | — | Release |
| May 10, 1991 | Released | Mike Aldrete | San Diego Padres | — | Release |
| May 10, 1991 | Released | Carmelo Castillo | Minnesota Twins | — | Release |
| May 9, 1991 | Released | Mark Ettles | Detroit Tigers | — | Release |
| May 9, 1991 | Released | Andy Hawkins | New York Yankees | — | Release |
| May 9, 1991 | Released | Jeff Kaiser | Milwaukee Brewers | — | Release |
| May 9, 1991 | Signed as free agent | Dave LaPoint | — | Milwaukee Brewers | Free agent signing |
| May 8, 1991 | Signed as free agent | Tom Filer | — | Chicago Cubs | Free agent signing |
| May 7, 1991 | Released | Tony Bernazard | Detroit Tigers | — | Release |
| May 6, 1991 | Trade | Kevin Castleberry | Atlanta Braves | Chicago White Sox | Trade |
| May 6, 1991 | Trade | Danny Heep | Chicago White Sox | Atlanta Braves | Trade |
| May 5, 1991 | Signed | Alex Cabrera | — | Chicago Cubs | Amateur free agent signing |
| May 5, 1991 | Released | Danny Leon | Detroit Tigers | — | Release |
| May 3, 1991 | Signed as free agent | Randy Veres | — | Atlanta Braves | Free agent signing |
| May 3, 1991 | Trade | Victor Cole | Kansas City Royals | Pittsburgh Pirates | Trade |
| May 3, 1991 | Trade | Carmelo Martinez | Pittsburgh Pirates | Kansas City Royals | Trade |
| May 1, 1991 | Signed as free agent | Mike Campbell | — | Texas Rangers | Free agent signing |
| May 1, 1991 | Signed as free agent | Nelson Liriano | — | Kansas City Royals | Free agent signing |
| May 1, 1991 | Signed as free agent | John Moses | — | Cleveland Indians | Free agent signing |
| May 1, 1991 | Signed as free agent | Gus Polidor | — | Milwaukee Brewers | Free agent signing |
| Apr 29, 1991 | Signed as free agent | Dave Clark | — | Kansas City Royals | Free agent signing |
| Apr 29, 1991 | Signed as free agent | Craig McMurtry | — | San Francisco Giants | Free agent signing |
| Apr 25, 1991 | Signed as free agent | Terry Puhl | — | Kansas City Royals | Free agent signing |
| Apr 24, 1991 | Trade | Dean Wilkins | Chicago Cubs | Houston Astros | Trade |
| Apr 24, 1991 | Trade | Jeff Baldwin | Houston Astros | Chicago Cubs | Trade |
| Apr 23, 1991 | Released | Dave LaPoint | Philadelphia Phillies | — | Release |
| Apr 19, 1991 | Signed as free agent | Mike Cook | — | Seattle Mariners | Free agent signing |
| Apr 19, 1991 | Signed as free agent | Fred Manrique | — | Oakland Athletics | Free agent signing |
| Apr 18, 1991 | Released | Randy Kutcher | Boston Red Sox | — | Release |
| Apr 18, 1991 | Signed as free agent | Steve Lyons | — | Boston Red Sox | Free agent signing |
| Apr 17, 1991 | Signed as free agent | Oddibe McDowell | — | Baltimore Orioles | Free agent signing |
| Apr 17, 1991 | Signed as free agent | Calvin Schiraldi | — | Houston Astros | Free agent signing |
| Apr 16, 1991 | Signed as free agent | Greg McMichael | — | Atlanta Braves | Free agent signing |
| Apr 15, 1991 | Signed as free agent | Clay Parker | — | Oakland Athletics | Free agent signing |
| Apr 13, 1991 | Signed as free agent | Brian Downing | — | Texas Rangers | Free agent signing |
| Apr 13, 1991 | Released | Steve Lyons | Chicago White Sox | — | Release |
| Apr 12, 1991 | Signed as free agent | Danny Heep | — | Chicago White Sox | Free agent signing |
| Apr 11, 1991 | Signed as free agent | Danny Leon | — | Detroit Tigers | Free agent signing |
| Apr 10, 1991 | Signed as free agent | Mitch Lyden | — | Detroit Tigers | Free agent signing |
| Apr 10, 1991 | Signed as free agent | Rick Schu | — | Philadelphia Phillies | Free agent signing |
| Apr 8, 1991 | Signed as free agent | Mike Birkbeck | — | Cleveland Indians | Free agent signing |
| Apr 8, 1991 | Signed as free agent | Dave Cochrane | — | Seattle Mariners | Free agent signing |
| Apr 8, 1991 | Signed as free agent | Jose Guzman | — | Texas Rangers | Free agent signing |
| Apr 8, 1991 | Signed as free agent | Kevin Hickey | — | Baltimore Orioles | Free agent signing |
| Apr 7, 1991 | Signed as free agent | John Cangelosi | — | Chicago White Sox | Free agent signing |
| Apr 7, 1991 | Signed as free agent | Don Carman | — | Cincinnati Reds | Free agent signing |
| Apr 7, 1991 | Signed as free agent | Todd Haney | — | Montreal Expos | Free agent signing |
| Apr 7, 1991 | Signed as free agent | Brad Holman | — | Seattle Mariners | Free agent signing |
| Apr 7, 1991 | Signed as free agent | Pete Incaviglia | — | Detroit Tigers | Free agent signing |
| Apr 7, 1991 | Signed as free agent | Dave LaPoint | — | Philadelphia Phillies | Free agent signing |
| Apr 7, 1991 | Signed as free agent | Dave Schmidt | — | Montreal Expos | Free agent signing |
| Apr 7, 1991 | Signed as free agent | Denny Walling | — | Texas Rangers | Free agent signing |
| Apr 7, 1991 | Signed as free agent | Ernie Whitt | — | Baltimore Orioles | Free agent signing |
| Apr 7, 1991 | Trade | Chuck McElroy | Philadelphia Phillies | Chicago Cubs | Trade |
| Apr 7, 1991 | Trade | Bob Scanlan | Philadelphia Phillies | Chicago Cubs | Trade |
| Apr 7, 1991 | Trade | Mitch Williams | Chicago Cubs | Philadelphia Phillies | Trade |
| Apr 6, 1991 | Released | Jay Baller | Houston Astros | — | Release |
| Apr 6, 1991 | Signed as free agent | Doug Davis | — | California Angels | Free agent signing |
| Apr 6, 1991 | Signed as free agent | Dave Leiper | — | California Angels | Free agent signing |
| Apr 6, 1991 | Signed as free agent | Dennis Powell | — | Seattle Mariners | Free agent signing |
| Apr 5, 1991 | Signed as free agent | Mike Aldrete | — | San Diego Padres | Free agent signing |
| Apr 5, 1991 | Released | William Brennan | Atlanta Braves | — | Release |
| Apr 5, 1991 | Released | Mike Cook | Minnesota Twins | — | Release |
| Apr 5, 1991 | Signed as free agent | Warren Cromartie | — | Kansas City Royals | Free agent signing |
| Apr 5, 1991 | Signed as free agent | Mike Felder | — | San Francisco Giants | Free agent signing |
| Apr 5, 1991 | Released | Tony Menendez | Montreal Expos | — | Release |
| Apr 5, 1991 | Released | Randy Veres | Milwaukee Brewers | — | Release |
| Apr 5, 1991 | Trade | Greg Sims | Pittsburgh Pirates | Minnesota Twins | Trade |
| Apr 5, 1991 | Trade | Joey Meyer | Minnesota Twins | Pittsburgh Pirates | Trade |
| Apr 4, 1991 | Released | Todd Haney | Detroit Tigers | — | Release |
| Apr 4, 1991 | Released | Greg McMichael | Cleveland Indians | — | Release |
| Apr 4, 1991 | Released | Craig McMurtry | Texas Rangers | — | Release |
| Apr 3, 1991 | Signed as free agent | Brian Fisher | — | Milwaukee Brewers | Free agent signing |
| Apr 3, 1991 | Released | Cecilio Guante | Boston Red Sox | — | Release |
| Apr 3, 1991 | Signed as free agent | Bo Jackson | — | Chicago White Sox | Free agent signing |
| Apr 3, 1991 | Signed as free agent | Sergio Valdez | — | Cleveland Indians | Free agent signing |
| Apr 3, 1991 | Trade | Joe Hall | St. Louis Cardinals | Chicago White Sox | Trade |
| Apr 3, 1991 | Trade | Willie Magallanes | Chicago White Sox | St. Louis Cardinals | Trade |
| Apr 2, 1991 | Released | Don Carman | Houston Astros | — | Release |
| Apr 2, 1991 | Signed as free agent | Rick Dempsey | — | Milwaukee Brewers | Free agent signing |
| Apr 2, 1991 | Released | Mike Felder | Milwaukee Brewers | — | Release |
| Apr 2, 1991 | Signed as free agent | Mike Flanagan | — | Baltimore Orioles | Free agent signing |
| Apr 2, 1991 | Released | Jose Guzman | Texas Rangers | — | Release |
| Apr 2, 1991 | Released | Kevin Hickey | Baltimore Orioles | — | Release |
| Apr 2, 1991 | Released | Nelson Liriano | Minnesota Twins | — | Release |
| Apr 2, 1991 | Released | Mitch Lyden | Cleveland Indians | — | Release |
| Apr 2, 1991 | Signed as free agent | Candy Maldonado | — | Milwaukee Brewers | Free agent signing |
| Apr 2, 1991 | Signed as free agent | Carlos Martinez | — | Cleveland Indians | Free agent signing |
| Apr 2, 1991 | Released | Dennis Powell | Baltimore Orioles | — | Release |
| Apr 2, 1991 | Signed as free agent | Willie Randolph | — | Milwaukee Brewers | Free agent signing |
| Apr 2, 1991 | Trade | Terrel Hansen | Montreal Expos | New York Mets | Trade |
| Apr 2, 1991 | Trade | Dave Sommer | Montreal Expos | New York Mets | Trade |
| Apr 2, 1991 | Trade | Darren Reed | New York Mets | Montreal Expos | Trade |
| Apr 2, 1991 | Trade | Alex Diaz | New York Mets | Montreal Expos | Trade |
| Apr 1, 1991 | Released | Steve Balboni | New York Yankees | — | Release |
| Apr 1, 1991 | Released | Mike Campbell | Milwaukee Brewers | — | Release |
| Apr 1, 1991 | Released | Dave Clark | Chicago Cubs | — | Release |
| Apr 1, 1991 | Released | Ron Kittle | Cleveland Indians | — | Release |
| Apr 1, 1991 | Released | Fred Manrique | California Angels | — | Release |
| Apr 1, 1991 | Released | Gus Polidor | Cincinnati Reds | — | Release |
| Apr 1, 1991 | Released | Terry Puhl | New York Mets | — | Release |
| Apr 1, 1991 | Released | Rick Schu | California Angels | — | Release |
| Apr 1, 1991 | Released | Andres Thomas | Atlanta Braves | — | Release |
| Apr 1, 1991 | Released | Rick Wrona | Milwaukee Brewers | — | Release |
| Apr 1, 1991 | Trade | Jimmy Kremers | Atlanta Braves | Montreal Expos | Trade |
| Apr 1, 1991 | Trade | Otis Nixon | Montreal Expos | Atlanta Braves | Trade |
| Apr 1, 1991 | Trade | Boi Rodriguez | Montreal Expos | Atlanta Braves | Trade |
| Apr 1, 1991 | Trade | Mike Gardiner | Seattle Mariners | Boston Red Sox | Trade |
| Apr 1, 1991 | Trade | Rob Murphy | Boston Red Sox | Seattle Mariners | Trade |
| Mar 31, 1991 | Released | John Moses | Boston Red Sox | — | Release |
| Mar 31, 1991 | Trade | Joey Cora | San Diego Padres | Chicago White Sox | Trade |
| Mar 31, 1991 | Trade | Kevin Garner | San Diego Padres | Chicago White Sox | Trade |
| Mar 31, 1991 | Trade | Warren Newson | San Diego Padres | Chicago White Sox | Trade |
| Mar 31, 1991 | Trade | Adam Peterson | Chicago White Sox | San Diego Padres | Trade |
| Mar 31, 1991 | Trade | Steve Rosenberg | Chicago White Sox | San Diego Padres | Trade |
| Mar 31, 1991 | Trade | Pete Rose | Baltimore Orioles | Chicago White Sox | Trade |
| Mar 31, 1991 | Trade | Joe Borowski | Chicago White Sox | Baltimore Orioles | Trade |
| Mar 30, 1991 | Released | Mike Aldrete | Montreal Expos | — | Release |
| Mar 30, 1991 | Signed as free agent | Darnell Coles | — | San Francisco Giants | Free agent signing |
| Mar 30, 1991 | Signed as free agent | Mike Maddux | — | San Diego Padres | Free agent signing |
| Mar 30, 1991 | Signed | Melvin Mora | — | Houston Astros | Amateur free agent signing |
| Mar 30, 1991 | Released | Calvin Schiraldi | San Diego Padres | — | Release |
| Mar 30, 1991 | Trade | Andy Allanson | Kansas City Royals | Detroit Tigers | Trade |
| Mar 30, 1991 | Trade | Jim Baxter | Detroit Tigers | Kansas City Royals | Trade |
| Mar 29, 1991 | Signed as free agent | Dwayne Henry | — | Houston Astros | Free agent signing |
| Mar 29, 1991 | Released | Brad Holman | Kansas City Royals | — | Release |
| Mar 29, 1991 | Released | Pete Incaviglia | Texas Rangers | — | Release |
| Mar 29, 1991 | Trade | Gary Varsho | Chicago Cubs | Pittsburgh Pirates | Trade |
| Mar 29, 1991 | Trade | Steve Carter | Pittsburgh Pirates | Chicago Cubs | Trade |
| Mar 28, 1991 | Released | Oddibe McDowell | Atlanta Braves | — | Release |
| Mar 28, 1991 | Released | Fernando Valenzuela | Los Angeles Dodgers | — | Release |
| Mar 27, 1991 | Released | Danny Leon | Montreal Expos | — | Release |
| Mar 26, 1991 | Signed as free agent | Gary Carter | — | Los Angeles Dodgers | Free agent signing |
| Mar 26, 1991 | Released | James Hurst | Cleveland Indians | — | Release |
| Mar 26, 1991 | Released | Greg Mathews | Kansas City Royals | — | Release |
| Mar 25, 1991 | Signed as free agent | John Candelaria | — | Los Angeles Dodgers | Free agent signing |
| Mar 25, 1991 | Released | Mike Dunne | San Diego Padres | — | Release |
| Mar 25, 1991 | Released | Sergio Valdez | Cleveland Indians | — | Release |
| Mar 22, 1991 | Released | Drew Hall | Montreal Expos | — | Release |
| Mar 21, 1991 | Signed | Esteban Loaiza | — | Pittsburgh Pirates | Amateur free agent signing |
| Mar 21, 1991 | Trade | Tommy Shields | Pittsburgh Pirates | Baltimore Orioles | Trade |
| Mar 19, 1991 | Signed as free agent | Jim Corsi | — | Houston Astros | Free agent signing |
| Mar 19, 1991 | Signed as free agent | Jimmy Jones | — | Houston Astros | Free agent signing |
| Mar 19, 1991 | Trade | Mark Leiter | New York Yankees | Detroit Tigers | Trade |
| Mar 19, 1991 | Trade | Torey Lovullo | Detroit Tigers | New York Yankees | Trade |
| Mar 18, 1991 | Signed as free agent | Ron Coomer | — | Chicago White Sox | Free agent signing |
| Mar 18, 1991 | Released | Bo Jackson | Kansas City Royals | — | Release |
| Mar 16, 1991 | Signed as free agent | Esteban Beltre | — | Milwaukee Brewers | Free agent signing |
| Mar 15, 1991 | Released | Clay Parker | Detroit Tigers | — | Release |
| Mar 15, 1991 | Signed as free agent | Rich Renteria | — | Detroit Tigers | Free agent signing |
| Mar 15, 1991 | Signed | Rafael Roque | — | New York Mets | Amateur free agent signing |
| Mar 14, 1991 | Trade | Dave Parker | Milwaukee Brewers | California Angels | Trade |
| Mar 14, 1991 | Trade | Dante Bichette | California Angels | Milwaukee Brewers | Trade |
| Mar 12, 1991 | Signed as free agent | Matt Maysey | — | Montreal Expos | Free agent signing |
| Mar 12, 1991 | Signed as free agent | Keith Shepherd | — | Chicago White Sox | Free agent signing |
| Mar 9, 1991 | Signed as free agent | Randy St. Claire | — | Atlanta Braves | Free agent signing |
| Mar 6, 1991 | Signed as free agent | Mark McLemore | — | Houston Astros | Free agent signing |
| Mar 6, 1991 | Signed as free agent | Jose Tolentino | — | Houston Astros | Free agent signing |
| Mar 4, 1991 | Signed as free agent | Freddie Toliver | — | California Angels | Free agent signing |
| Mar 3, 1991 | Signed | Roger Cedeno | — | Los Angeles Dodgers | Amateur free agent signing |
| Mar 2, 1991 | Signed as free agent | Mike Davis | — | Montreal Expos | Free agent signing |
| Feb 27, 1991 | Signed as free agent | Geronimo Berroa | — | Seattle Mariners | Free agent signing |
| Feb 27, 1991 | Signed as free agent | Rick Mahler | — | Montreal Expos | Free agent signing |
| Feb 21, 1991 | Signed as free agent | Steve Howe | — | New York Yankees | Free agent signing |
| Feb 20, 1991 | Signed as free agent | Shawn Barton | — | Seattle Mariners | Free agent signing |
| Feb 19, 1991 | Signed | Edgardo Alfonzo | — | New York Mets | Amateur free agent signing |
| Feb 19, 1991 | Signed as free agent | Dennis Powell | — | Baltimore Orioles | Free agent signing |
| Feb 17, 1991 | Released | Dave LaPoint | New York Yankees | — | Release |
| Feb 15, 1991 | Signed as free agent | Rich Gedman | — | St. Louis Cardinals | Free agent signing |
| Feb 15, 1991 | Signed as free agent | Ron Hassey | — | Montreal Expos | Free agent signing |
| Feb 15, 1991 | Trade | Mario Brito | Montreal Expos | Chicago White Sox | Trade |
| Feb 14, 1991 | Released | Matt Maysey | San Diego Padres | — | Release |
| Feb 13, 1991 | Signed as free agent | Glenn Wilson | — | Atlanta Braves | Free agent signing |
| Feb 11, 1991 | Signed as free agent | Cecil Espy | — | Pittsburgh Pirates | Free agent signing |
| Feb 9, 1991 | Signed as free agent | Pat Clements | — | San Diego Padres | Free agent signing |
| Feb 8, 1991 | Signed | Tony Batista | — | Oakland Athletics | Amateur free agent signing |
| Feb 8, 1991 | Signed as free agent | Jim Presley | — | San Diego Padres | Free agent signing |
| Feb 8, 1991 | Signed as free agent | Tracy Woodson | — | Atlanta Braves | Free agent signing |
| Feb 7, 1991 | Signed as free agent | Tommy Barrett | — | Boston Red Sox | Free agent signing |
| Feb 7, 1991 | Signed as free agent | Benny Distefano | — | Baltimore Orioles | Free agent signing |
| Feb 7, 1991 | Trade | Mike Humphreys | San Diego Padres | New York Yankees | Trade |
| Feb 6, 1991 | Signed as free agent | Don Carman | — | Houston Astros | Free agent signing |
| Feb 5, 1991 | Signed as free agent | Jack Morris | — | Minnesota Twins | Free agent signing |
| Feb 4, 1991 | Signed as free agent | Mark Huismann | — | Pittsburgh Pirates | Free agent signing |
| Feb 4, 1991 | Signed as free agent | Mike Stanley | — | Texas Rangers | Free agent signing |
| Feb 1, 1991 | Released | Geronimo Berroa | Atlanta Braves | — | Release |
| Feb 1, 1991 | Signed as free agent | John Moses | — | Boston Red Sox | Free agent signing |
| Feb 1, 1991 | Signed as free agent | Yorkis Perez | — | Atlanta Braves | Free agent signing |
| Feb 1, 1991 | Signed as free agent | John Russell | — | Texas Rangers | Free agent signing |
| Jan 31, 1991 | Signed as free agent | Bill Long | — | Montreal Expos | Free agent signing |
| Jan 30, 1991 | Signed as free agent | Deion Sanders | — | Atlanta Braves | Free agent signing |
| Jan 29, 1991 | Signed as free agent | Juan Berenguer | — | Atlanta Braves | Free agent signing |
| Jan 29, 1991 | Signed as free agent | Chili Davis | — | Minnesota Twins | Free agent signing |
| Jan 28, 1991 | Signed as free agent | Greg Tubbs | — | Pittsburgh Pirates | Free agent signing |
| Jan 28, 1991 | Signed as free agent | Kevin Ward | — | San Diego Padres | Free agent signing |
| Jan 27, 1991 | Signed as free agent | Chris Howard | — | Chicago White Sox | Free agent signing |
| Jan 25, 1991 | Signed as free agent | Rich Gossage | — | Texas Rangers | Free agent signing |
| Jan 25, 1991 | Signed as free agent | Brad Komminsk | — | Oakland Athletics | Free agent signing |
| Jan 25, 1991 | Signed as free agent | Mike Pagliarulo | — | Minnesota Twins | Free agent signing |
| Jan 25, 1991 | Signed as free agent | Jeff Schulz | — | Pittsburgh Pirates | Free agent signing |
| Jan 25, 1991 | Signed as free agent | Doug Sisk | — | Atlanta Braves | Free agent signing |
| Jan 24, 1991 | Signed as free agent | Pat Sheridan | — | New York Yankees | Free agent signing |
| Jan 23, 1991 | Signed as free agent | Mike Brumley | — | Boston Red Sox | Free agent signing |
| Jan 23, 1991 | Signed as free agent | Tony Fossas | — | Boston Red Sox | Free agent signing |
| Jan 23, 1991 | Signed as free agent | Gary Gaetti | — | California Angels | Free agent signing |
| Jan 22, 1991 | Signed as free agent | Jay Baller | — | Houston Astros | Free agent signing |
| Jan 22, 1991 | Signed as free agent | Mike Heath | — | Atlanta Braves | Free agent signing |
| Jan 22, 1991 | Signed as free agent | Randy Kramer | — | Atlanta Braves | Free agent signing |
| Jan 22, 1991 | Signed as free agent | Rich Sauveur | — | New York Mets | Free agent signing |
| Jan 21, 1991 | Signed as free agent | Skeeter Barnes | — | Detroit Tigers | Free agent signing |
| Jan 21, 1991 | Signed as free agent | Rick Cerone | — | New York Mets | Free agent signing |
| Jan 21, 1991 | Signed as free agent | Greg Mathews | — | Kansas City Royals | Free agent signing |
| Jan 21, 1991 | Signed as free agent | Scott May | — | Chicago Cubs | Free agent signing |
| Jan 21, 1991 | Signed as free agent | Paul Zuvella | — | Kansas City Royals | Free agent signing |
| Jan 21, 1991 | Trade | Dave Richards | Detroit Tigers | Seattle Mariners | Trade |
| Jan 21, 1991 | Trade | Todd Haney | Seattle Mariners | Detroit Tigers | Trade |
| Jan 20, 1991 | Signed as free agent | Ron Kittle | — | Cleveland Indians | Free agent signing |
| Jan 20, 1991 | Signed | Melvin Rosario | — | San Diego Padres | Amateur free agent signing |
| Jan 19, 1991 | Signed as free agent | Jerry Willard | — | Atlanta Braves | Free agent signing |
| Jan 18, 1991 | Signed as free agent | Andy Allanson | — | Kansas City Royals | Free agent signing |
| Jan 17, 1991 | Signed as free agent | Jeff Robinson | — | California Angels | Free agent signing |
| Jan 16, 1991 | Signed as free agent | Dave Otto | — | Cleveland Indians | Free agent signing |
| Jan 16, 1991 | Trade | Troy Neel | Cleveland Indians | Oakland Athletics | Trade |
| Jan 16, 1991 | Trade | Larry Arndt | Oakland Athletics | Cleveland Indians | Trade |
| Jan 15, 1991 | Signed as free agent | Chris Beasley | — | California Angels | Free agent signing |
| Jan 15, 1991 | Signed as free agent | Dann Bilardello | — | San Diego Padres | Free agent signing |
| Jan 15, 1991 | Signed as free agent | Brian Dorsett | — | San Diego Padres | Free agent signing |
| Jan 15, 1991 | Trade | Rob Blumberg | Toronto Blue Jays | Baltimore Orioles | Trade |
| Jan 15, 1991 | Trade | Rene Gonzales | Baltimore Orioles | Toronto Blue Jays | Trade |
| Jan 15, 1991 | Trade | Kevin Campbell | Los Angeles Dodgers | Oakland Athletics | Trade |
| Jan 15, 1991 | Trade | Dave Veres | Oakland Athletics | Los Angeles Dodgers | Trade |
| Jan 14, 1991 | Signed as free agent | John Cerutti | — | Detroit Tigers | Free agent signing |
| Jan 14, 1991 | Signed as free agent | Tom Edens | — | Minnesota Twins | Free agent signing |
| Jan 14, 1991 | Signed as free agent | Webster Garrison | — | Oakland Athletics | Free agent signing |
| Jan 13, 1991 | Signed as free agent | William Brennan | — | Atlanta Braves | Free agent signing |
| Jan 13, 1991 | Released | Rick Cerone | New York Yankees | — | Release |
| Jan 13, 1991 | Signed as free agent | Kevin Koslofski | — | Kansas City Royals | Free agent signing |
| Jan 11, 1991 | Signed as free agent | Jim Lindeman | — | Philadelphia Phillies | Free agent signing |
| Jan 11, 1991 | Signed as free agent | Luis Lopez | — | Cleveland Indians | Free agent signing |
| Jan 11, 1991 | Signed as free agent | Mitch Lyden | — | Cleveland Indians | Free agent signing |
| Jan 11, 1991 | Trade | Jeff Robinson | Detroit Tigers | Baltimore Orioles | Trade |
| Jan 11, 1991 | Trade | Mickey Tettleton | Baltimore Orioles | Detroit Tigers | Trade |
| Jan 10, 1991 | Signed as free agent | Wally Backman | — | Philadelphia Phillies | Free agent signing |
| Jan 10, 1991 | Signed | Carlos Mendez | — | Kansas City Royals | Amateur free agent signing |
| Jan 10, 1991 | Signed as free agent | John Morris | — | Philadelphia Phillies | Free agent signing |
| Jan 10, 1991 | Signed as free agent | Gus Polidor | — | Cincinnati Reds | Free agent signing |
| Jan 10, 1991 | Signed as free agent | Kelvin Torve | — | New York Mets | Free agent signing |
| Jan 10, 1991 | Signed as free agent | Eddie Zambrano | — | Pittsburgh Pirates | Free agent signing |
| Jan 10, 1991 | Trade | Pete Harnisch | Baltimore Orioles | Houston Astros | Trade |
| Jan 10, 1991 | Trade | Curt Schilling | Baltimore Orioles | Houston Astros | Trade |
| Jan 10, 1991 | Trade | Steve Finley | Baltimore Orioles | Houston Astros | Trade |
| Jan 10, 1991 | Trade | Glenn Davis | Houston Astros | Baltimore Orioles | Trade |
| Jan 9, 1991 | Signed as free agent | Jamie Moyer | — | St. Louis Cardinals | Free agent signing |
| Jan 9, 1991 | Signed as free agent | Dennis Rasmussen | — | San Diego Padres | Free agent signing |
| Jan 9, 1991 | Signed as free agent | Curt Wilkerson | — | Pittsburgh Pirates | Free agent signing |
| Jan 8, 1991 | Signed as free agent | Marty Barrett | — | San Diego Padres | Free agent signing |
| Jan 8, 1991 | Signed as free agent | Craig McMurtry | — | Texas Rangers | Free agent signing |
| Jan 8, 1991 | Signed as free agent | Rob Nelson | — | Chicago White Sox | Free agent signing |
| Jan 7, 1991 | Signed as free agent | Keith Hughes | — | New York Yankees | Free agent signing |
| Jan 7, 1991 | Signed as free agent | Vance Law | — | Oakland Athletics | Free agent signing |
| Jan 7, 1991 | Signed as free agent | Tony Menendez | — | Montreal Expos | Free agent signing |
| Jan 5, 1991 | Signed as free agent | Mike Capel | — | Houston Astros | Free agent signing |
| Jan 3, 1991 | Signed as free agent | Jeff Fassero | — | Montreal Expos | Free agent signing |
| Jan 2, 1991 | Signed as free agent | Alex Trevino | — | St. Louis Cardinals | Free agent signing |
| Jan 2, 1991 | Signed as free agent | Mike Witt | — | New York Yankees | Free agent signing |
| Jan 1, 1991 | Signed as free agent | Jeff Kaiser | — | Milwaukee Brewers | Free agent signing |
| Jan 1, 1991 | Signed as free agent | Roy Smith | — | Baltimore Orioles | Free agent signing |
| before the 1991 season | Signed as free agent | Joey Meyer | — | Minnesota Twins | 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.