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The 1980 season’s official transaction log: 415 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 29, 1980 | Signed as free agent | Juan Beniquez | — | California Angels | Free agent signing |
| Dec 29, 1980 | Signed as free agent | Pat Kelly | — | Cleveland Indians | Free agent signing |
| Dec 24, 1980 | Signed as free agent | Mike Sadek | — | San Francisco Giants | Free agent signing |
| Dec 23, 1980 | Signed as free agent | Jim Dwyer | — | Baltimore Orioles | Free agent signing |
| Dec 22, 1980 | Released | Bobby Bonds | St. Louis Cardinals | — | Release |
| Dec 22, 1980 | Signed as free agent | Del Unser | — | Philadelphia Phillies | Free agent signing |
| Dec 22, 1980 | Trade | Ty Waller | St. Louis Cardinals | Chicago Cubs | Trade |
| Dec 20, 1980 | Signed as free agent | Roy Howell | — | Milwaukee Brewers | Free agent signing |
| Dec 19, 1980 | Released | Bill Almon | New York Mets | — | Release |
| Dec 19, 1980 | Signed as free agent | Stan Bahnsen | — | Montreal Expos | Free agent signing |
| Dec 19, 1980 | Signed as free agent | Mike Cubbage | — | New York Mets | Free agent signing |
| Dec 19, 1980 | Released | Junior Moore | Chicago White Sox | — | Release |
| Dec 19, 1980 | Trade | Steve Stroughter | Seattle Mariners | Minnesota Twins | Trade |
| Dec 19, 1980 | Trade | Mike Bacsik | Minnesota Twins | Seattle Mariners | Trade |
| Dec 18, 1980 | Signed as free agent | Bob Jones | — | Texas Rangers | Free agent signing |
| Dec 18, 1980 | Signed as free agent | Bill Stein | — | Texas Rangers | Free agent signing |
| Dec 17, 1980 | Released | Bob Davis | Toronto Blue Jays | — | Release |
| Dec 17, 1980 | Signed | Ozzie Guillen | — | San Diego Padres | Amateur free agent signing |
| Dec 17, 1980 | Signed as free agent | Jose Morales | — | Baltimore Orioles | Free agent signing |
| Dec 16, 1980 | Signed as free agent | Rusty Staub | — | New York Mets | Free agent signing |
| Dec 15, 1980 | Released | Paul Hartzell | Baltimore Orioles | — | Release |
| Dec 15, 1980 | Released | Jay Pettibone | Texas Rangers | — | Release |
| Dec 15, 1980 | Signed as free agent | Dave Winfield | — | New York Yankees | Free agent signing |
| Dec 15, 1980 | Trade | Randy Jones | San Diego Padres | New York Mets | Trade |
| Dec 15, 1980 | Trade | John Pacella | New York Mets | San Diego Padres | Trade |
| Dec 15, 1980 | Trade | Jose Moreno | New York Mets | San Diego Padres | Trade |
| Dec 15, 1980 | Trade | Don Werner | Cincinnati Reds | Texas Rangers | Trade |
| Dec 15, 1980 | Trade | Greg Hughes | Cincinnati Reds | Texas Rangers | Trade |
| Dec 15, 1980 | Trade | Greg Mahlberg | Texas Rangers | Cincinnati Reds | Trade |
| Dec 15, 1980 | Trade | Danny Walton | Texas Rangers | Cincinnati Reds | Trade |
| Dec 12, 1980 | Released | Dave Hamilton | Oakland Athletics | — | Release |
| Dec 12, 1980 | Signed as free agent | Willie Montanez | — | Montreal Expos | Free agent signing |
| Dec 12, 1980 | Trade | Rich Wortham | Chicago White Sox | Montreal Expos | Trade |
| Dec 12, 1980 | Trade | Tony Bernazard | Montreal Expos | Chicago White Sox | Trade |
| Dec 12, 1980 | Trade | Doyle Alexander | Atlanta Braves | San Francisco Giants | Trade |
| Dec 12, 1980 | Trade | John Montefusco | San Francisco Giants | Atlanta Braves | Trade |
| Dec 12, 1980 | Trade | Craig Landis | San Francisco Giants | Atlanta Braves | Trade |
| Dec 12, 1980 | Trade | Joe Strain | San Francisco Giants | Chicago Cubs | Trade |
| Dec 12, 1980 | Trade | Phil Nastu | San Francisco Giants | Chicago Cubs | Trade |
| Dec 12, 1980 | Trade | Jerry Martin | Chicago Cubs | San Francisco Giants | Trade |
| Dec 12, 1980 | Trade | Jesus Figueroa | Chicago Cubs | San Francisco Giants | Trade |
| Dec 12, 1980 | Trade | Mike Vail | Chicago Cubs | Cincinnati Reds | Trade |
| Dec 12, 1980 | Trade | Hector Cruz | Cincinnati Reds | Chicago Cubs | Trade |
| Dec 12, 1980 | Trade | Sixto Lezcano | Milwaukee Brewers | St. Louis Cardinals | Trade |
| Dec 12, 1980 | Trade | David Green | Milwaukee Brewers | St. Louis Cardinals | Trade |
| Dec 12, 1980 | Trade | Lary Sorensen | Milwaukee Brewers | St. Louis Cardinals | Trade |
| Dec 12, 1980 | Trade | Dave LaPoint | Milwaukee Brewers | St. Louis Cardinals | Trade |
| Dec 12, 1980 | Trade | Pete Vuckovich | St. Louis Cardinals | Milwaukee Brewers | Trade |
| Dec 12, 1980 | Trade | Rollie Fingers | St. Louis Cardinals | Milwaukee Brewers | Trade |
| Dec 12, 1980 | Trade | Ted Simmons | St. Louis Cardinals | Milwaukee Brewers | Trade |
| Dec 12, 1980 | Trade | Bob Bailor | Toronto Blue Jays | New York Mets | Trade |
| Dec 12, 1980 | Trade | Roy Lee Jackson | New York Mets | Toronto Blue Jays | Trade |
| Dec 12, 1980 | Trade | Dave Stegman | Detroit Tigers | San Diego Padres | Trade |
| Dec 12, 1980 | Trade | Dennis Kinney | San Diego Padres | Detroit Tigers | Trade |
| Dec 12, 1980 | Trade | Richie Zisk | Texas Rangers | Seattle Mariners | Trade |
| Dec 12, 1980 | Trade | Rick Auerbach | Texas Rangers | Seattle Mariners | Trade |
| Dec 12, 1980 | Trade | Ken Clay | Texas Rangers | Seattle Mariners | Trade |
| Dec 12, 1980 | Trade | Jerry Don Gleaton | Texas Rangers | Seattle Mariners | Trade |
| Dec 12, 1980 | Trade | Brian Allard | Texas Rangers | Seattle Mariners | Trade |
| Dec 12, 1980 | Trade | Steve Finch | Texas Rangers | Seattle Mariners | Trade |
| Dec 12, 1980 | Trade | Rick Honeycutt | Seattle Mariners | Texas Rangers | Trade |
| Dec 12, 1980 | Trade | Mario Mendoza | Seattle Mariners | Texas Rangers | Trade |
| Dec 12, 1980 | Trade | Larry Cox | Seattle Mariners | Texas Rangers | Trade |
| Dec 12, 1980 | Trade | Leon Roberts | Seattle Mariners | Texas Rangers | Trade |
| Dec 12, 1980 | Trade | Willie Horton | Seattle Mariners | Texas Rangers | Trade |
| Dec 12, 1980 | Trade | Byron McLaughlin | Seattle Mariners | Minnesota Twins | Trade |
| Dec 12, 1980 | Trade | Willie Norwood | Minnesota Twins | Seattle Mariners | Trade |
| Dec 11, 1980 | Signed as free agent | John D'Acquisto | — | California Angels | Free agent signing |
| Dec 11, 1980 | Trade | Mike King | Oakland Athletics | Chicago Cubs | Trade |
| Dec 11, 1980 | Trade | Cliff Johnson | Chicago Cubs | Oakland Athletics | Trade |
| Dec 11, 1980 | Trade | Keith Drumright | Chicago Cubs | Oakland Athletics | Trade |
| Dec 10, 1980 | Signed as free agent | Dave Roberts | — | Houston Astros | Free agent signing |
| Dec 10, 1980 | Trade | Bob Geren | San Diego Padres | St. Louis Cardinals | Trade |
| Dec 10, 1980 | Trade | Carney Lansford | California Angels | Boston Red Sox | Trade |
| Dec 10, 1980 | Trade | Rick Miller | California Angels | Boston Red Sox | Trade |
| Dec 10, 1980 | Trade | Mark Clear | California Angels | Boston Red Sox | Trade |
| Dec 10, 1980 | Trade | Rick Burleson | Boston Red Sox | California Angels | Trade |
| Dec 10, 1980 | Trade | Butch Hobson | Boston Red Sox | California Angels | Trade |
| Dec 10, 1980 | Trade | Kevin Saucier | Texas Rangers | Detroit Tigers | Trade |
| Dec 10, 1980 | Trade | Mark Wagner | Detroit Tigers | Texas Rangers | Trade |
| Dec 9, 1980 | Signed as free agent | Lee May | — | Kansas City Royals | Free agent signing |
| Dec 9, 1980 | Trade | Leon Durham | St. Louis Cardinals | Chicago Cubs | Trade |
| Dec 9, 1980 | Trade | Ken Reitz | St. Louis Cardinals | Chicago Cubs | Trade |
| Dec 9, 1980 | Trade | Bruce Sutter | Chicago Cubs | St. Louis Cardinals | Trade |
| Dec 9, 1980 | Trade | Gary Alexander | Cleveland Indians | Pittsburgh Pirates | Trade |
| Dec 9, 1980 | Trade | Victor Cruz | Cleveland Indians | Pittsburgh Pirates | Trade |
| Dec 9, 1980 | Trade | Rafael Vasquez | Cleveland Indians | Pittsburgh Pirates | Trade |
| Dec 9, 1980 | Trade | Bob Owchinko | Cleveland Indians | Pittsburgh Pirates | Trade |
| Dec 9, 1980 | Trade | Bert Blyleven | Pittsburgh Pirates | Cleveland Indians | Trade |
| Dec 9, 1980 | Trade | Manny Sanguillen | Pittsburgh Pirates | Cleveland Indians | Trade |
| Dec 8, 1980 | Released | Paul Dade | San Diego Padres | — | Release |
| Dec 8, 1980 | Released | Joe Morgan | Houston Astros | — | Release |
| Dec 8, 1980 | Signed as free agent | Dan Spillner | — | Cleveland Indians | Free agent signing |
| Dec 8, 1980 | Trade | Enos Cabell | Houston Astros | San Francisco Giants | Trade |
| Dec 8, 1980 | Trade | Bob Knepper | San Francisco Giants | Houston Astros | Trade |
| Dec 8, 1980 | Trade | Chris Bourjos | San Francisco Giants | Houston Astros | Trade |
| Dec 8, 1980 | Trade | Rollie Fingers | San Diego Padres | St. Louis Cardinals | Trade |
| Dec 8, 1980 | Trade | Bob Shirley | San Diego Padres | St. Louis Cardinals | Trade |
| Dec 8, 1980 | Trade | Gene Tenace | San Diego Padres | St. Louis Cardinals | Trade |
| Dec 8, 1980 | Trade | Terry Kennedy | St. Louis Cardinals | San Diego Padres | Trade |
| Dec 8, 1980 | Trade | Steve Swisher | St. Louis Cardinals | San Diego Padres | Trade |
| Dec 8, 1980 | Trade | Mike Phillips | St. Louis Cardinals | San Diego Padres | Trade |
| Dec 8, 1980 | Trade | John Littlefield | St. Louis Cardinals | San Diego Padres | Trade |
| Dec 8, 1980 | Trade | John Urrea | St. Louis Cardinals | San Diego Padres | Trade |
| Dec 8, 1980 | Trade | Kim Seaman | St. Louis Cardinals | San Diego Padres | Trade |
| Dec 8, 1980 | Trade | Al Olmsted | St. Louis Cardinals | San Diego Padres | Trade |
| Dec 8, 1980 | Trade | Dave Edwards | Minnesota Twins | San Diego Padres | Trade |
| Dec 8, 1980 | Trade | Chuck Baker | San Diego Padres | Minnesota Twins | Trade |
| Dec 7, 1980 | Signed as free agent | Darrell Porter | — | St. Louis Cardinals | Free agent signing |
| Dec 6, 1980 | Signed as free agent | Tug McGraw | — | Philadelphia Phillies | Free agent signing |
| Dec 4, 1980 | Signed as free agent | Don Sutton | — | Houston Astros | Free agent signing |
| Dec 2, 1980 | Released | Kevin Bell | Chicago White Sox | — | Release |
| Dec 2, 1980 | Signed as free agent | Geoff Zahn | — | California Angels | Free agent signing |
| Nov 26, 1980 | Signed as free agent | Ron LeFlore | — | Chicago White Sox | Free agent signing |
| Nov 25, 1980 | Signed | Rick Schu | — | Philadelphia Phillies | Amateur free agent signing |
| Nov 20, 1980 | Signed as free agent | Jim Essian | — | Chicago White Sox | Free agent signing |
| Nov 19, 1980 | Trade | Kevin Saucier | Philadelphia Phillies | Texas Rangers | Trade |
| Nov 18, 1980 | Trade | Unnamed | New York Yankees | Seattle Mariners | $150000 |
| Nov 18, 1980 | Trade | Larry Milbourne | Seattle Mariners | New York Yankees | Trade |
| Nov 18, 1980 | Trade | Brad Gulden | New York Yankees | Seattle Mariners | Trade |
| Nov 16, 1980 | Signed | Kevin Mitchell | — | New York Mets | Amateur free agent signing |
| Nov 15, 1980 | Signed as free agent | Gibson Alba | — | St. Louis Cardinals | Free agent signing |
| Nov 15, 1980 | Signed as free agent | Claudell Washington | — | Atlanta Braves | Free agent signing |
| Nov 11, 1980 | Signed as free agent | Dave Chalk | — | Kansas City Royals | Free agent signing |
| Nov 4, 1980 | Released | Marshall Brant | New York Yankees | — | Release |
| Nov 4, 1980 | Signed | Dave Gumpert | — | Detroit Tigers | Amateur free agent signing |
| Nov 3, 1980 | Trade | Mike Morgan | Oakland Athletics | New York Yankees | Trade |
| Nov 3, 1980 | Trade | Fred Stanley | New York Yankees | Oakland Athletics | Trade |
| Oct 29, 1980 | Trade | Larry Andersen | Pittsburgh Pirates | Seattle Mariners | Trade |
| Oct 28, 1980 | Signed as free agent | Houston Jimenez | — | Minnesota Twins | Free agent signing with first major-league team |
| Oct 25, 1980 | Released | Don Hood | St. Louis Cardinals | — | Release |
| Oct 24, 1980 | Released | Mike Anderson | Philadelphia Phillies | — | Release |
| Oct 24, 1980 | Released | Vic Correll | Cincinnati Reds | — | Release |
| Oct 24, 1980 | Released | Don Gullett | New York Yankees | — | Release |
| Oct 24, 1980 | Released | Ed Halicki | California Angels | — | Release |
| Oct 24, 1980 | Released | Dave Lemanczyk | California Angels | — | Release |
| Oct 24, 1980 | Released | Tim McCarver | Philadelphia Phillies | — | Release |
| Oct 24, 1980 | Trade | Unnamed | Texas Rangers | New York Yankees | $ |
| Oct 24, 1980 | Trade | Tucker Ashford | Texas Rangers | New York Yankees | Trade |
| Oct 24, 1980 | Trade | Roger Holt | New York Yankees | Texas Rangers | Trade |
| Oct 23, 1980 | Released | Randy Elliott | Oakland Athletics | — | Release |
| Oct 23, 1980 | Signed | Mark Portugal | — | Minnesota Twins | Amateur free agent signing |
| Oct 21, 1980 | Released | Gene Pentz | Pittsburgh Pirates | — | Release |
| Oct 20, 1980 | Released | Bill Landrum | Chicago Cubs | — | Release |
| Oct 17, 1980 | Trade | Mike O'Berry | Chicago Cubs | Cincinnati Reds | Trade |
| Oct 17, 1980 | Trade | Jay Howell | Cincinnati Reds | Chicago Cubs | Trade |
| Oct 16, 1980 | Released | Vic Davalillo | Los Angeles Dodgers | — | Release |
| Oct 10, 1980 | Released | Jim Rooker | Pittsburgh Pirates | — | Release |
| Oct 8, 1980 | Signed | Bernardo Brito | — | Cleveland Indians | Amateur free agent signing |
| Oct 8, 1980 | Released | Bernie Carbo | Pittsburgh Pirates | — | Release |
| Oct 8, 1980 | Released | Manny Mota | Los Angeles Dodgers | — | Release |
| Oct 6, 1980 | Released | Minnie Miñoso | Chicago White Sox | — | Release |
| Oct 4, 1980 | Signed | Francisco Melendez | — | Philadelphia Phillies | Amateur free agent signing |
| Oct 3, 1980 | Signed as free agent | Minnie Miñoso | — | Chicago White Sox | Free agent signing |
| Oct 1, 1980 | Trade | Marv Thompson | New York Yankees | Texas Rangers | Trade |
| Sep 30, 1980 | Released | Alvaro Espinoza | Houston Astros | — | Release |
| Sep 21, 1980 | Signed | Roger Mason | — | Detroit Tigers | Amateur free agent signing |
| Sep 13, 1980 | Trade | Sparky Lyle | Texas Rangers | Philadelphia Phillies | Trade |
| Sep 13, 1980 | Trade | Unnamed | Los Angeles Dodgers | Texas Rangers | $ |
| Sep 13, 1980 | Trade | Dennis Lewallyn | Los Angeles Dodgers | Texas Rangers | Trade |
| Sep 13, 1980 | Trade | Pepe Frias | Texas Rangers | Los Angeles Dodgers | Trade |
| Sep 10, 1980 | Signed | Francisco Oliveras | — | Baltimore Orioles | Amateur free agent signing |
| Sep 5, 1980 | Trade | Randy Bass | Montreal Expos | San Diego Padres | Trade |
| Sep 3, 1980 | Released | Balor Moore | Toronto Blue Jays | — | Release |
| Sep 2, 1980 | Released | Dave Tomlin | Cincinnati Reds | — | Release |
| Sep 1, 1980 | Signed as free agent | Bernie Carbo | — | Pittsburgh Pirates | Free agent signing |
| Sep 1, 1980 | Signed as free agent | Tim McCarver | — | Philadelphia Phillies | Free agent signing |
| Aug 31, 1980 | Trade | Unnamed | Montreal Expos | San Diego Padres | $ |
| Aug 31, 1980 | Trade | Willie Montanez | San Diego Padres | Montreal Expos | Trade |
| Aug 31, 1980 | Trade | Tony Phillips | Montreal Expos | San Diego Padres | Trade |
| Aug 29, 1980 | Released | Steve Busby | Kansas City Royals | — | Release |
| Aug 29, 1980 | Signed as free agent | Manny Mota | — | Los Angeles Dodgers | Free agent signing |
| Aug 29, 1980 | Released | Rusty Torres | Kansas City Royals | — | Release |
| Aug 28, 1980 | Released | Dale Murray | Montreal Expos | — | Release |
| Aug 21, 1980 | Signed as free agent | Jose Cardenal | — | Kansas City Royals | Free agent signing |
| Aug 21, 1980 | Released | Rawly Eastwick | Kansas City Royals | — | Release |
| Aug 21, 1980 | Signed | Ravelo Manzanillo | — | Pittsburgh Pirates | Amateur free agent signing |
| Aug 20, 1980 | Signed | Ed Amelung | — | Los Angeles Dodgers | Amateur free agent signing |
| Aug 20, 1980 | Released | Alberto Lois | Pittsburgh Pirates | — | Release |
| Aug 18, 1980 | Signed | La Schelle Tarver | — | New York Mets | Amateur free agent signing |
| Aug 18, 1980 | Signed as free agent | Jose Uribe | — | St. Louis Cardinals | Free agent signing |
| Aug 16, 1980 | Released | Roger Metzger | San Francisco Giants | — | Release |
| Aug 14, 1980 | Signed | Tom Niedenfuer | — | Los Angeles Dodgers | Amateur free agent signing |
| Aug 14, 1980 | Trade | Gaylord Perry | Texas Rangers | New York Yankees | Trade |
| Aug 14, 1980 | Trade | Ken Clay | New York Yankees | Texas Rangers | Trade |
| Aug 13, 1980 | Released | Jose Cardenal | New York Mets | — | Release |
| Aug 12, 1980 | Signed | Jose Gonzalez | — | Los Angeles Dodgers | Amateur free agent signing |
| Aug 12, 1980 | Trade | Mark Lee | San Diego Padres | Pittsburgh Pirates | Trade |
| Aug 11, 1980 | Signed as free agent | Ken Brett | — | Kansas City Royals | Free agent signing |
| Aug 11, 1980 | Released | Von Joshua | San Diego Padres | — | Release |
| Aug 11, 1980 | Released | Fred Kendall | San Diego Padres | — | Release |
| Aug 11, 1980 | Trade | Unnamed | San Diego Padres | Montreal Expos | $ |
| Aug 11, 1980 | Trade | John D'Acquisto | San Diego Padres | Montreal Expos | Trade |
| Aug 8, 1980 | Released | Larvell Blanks | Atlanta Braves | — | Release |
| Aug 8, 1980 | Released | Tom Buskey | Toronto Blue Jays | — | Release |
| Aug 8, 1980 | Released | Bob Stinson | Seattle Mariners | — | Release |
| Aug 6, 1980 | Released | Jose Cano | New York Yankees | — | Release |
| Aug 5, 1980 | Trade | Kurt Bevacqua | San Diego Padres | Pittsburgh Pirates | Trade |
| Aug 5, 1980 | Trade | Rick Lancellotti | Pittsburgh Pirates | San Diego Padres | Trade |
| Aug 5, 1980 | Trade | Luis Salazar | Pittsburgh Pirates | San Diego Padres | Trade |
| Aug 1, 1980 | Signed | Jose Rijo | — | New York Yankees | Amateur free agent signing |
| Jul 27, 1980 | Signed as free agent | Terry Leach | — | New York Mets | Free agent signing |
| Jul 24, 1980 | Signed | Bill Lyons | — | Milwaukee Brewers | Amateur free agent signing |
| Jul 23, 1980 | Released | Terry Leach | Atlanta Braves | — | Release |
| Jul 20, 1980 | Released | Ken Henderson | Chicago Cubs | — | Release |
| Jul 19, 1980 | Signed | Dave Shipanoff | — | Toronto Blue Jays | Amateur free agent signing |
| Jul 17, 1980 | Released | Lerrin LaGrow | Philadelphia Phillies | — | Release |
| Jul 16, 1980 | Released | Bob Randall | Minnesota Twins | — | Release |
| Jul 16, 1980 | Trade | Bob Beall | Atlanta Braves | Pittsburgh Pirates | Trade |
| Jul 16, 1980 | Trade | Jerry McDonald | Pittsburgh Pirates | Atlanta Braves | Trade |
| Jul 14, 1980 | Signed | Rolando Roomes | — | Chicago Cubs | Amateur free agent signing |
| Jul 12, 1980 | Signed | Bill Krueger | — | Oakland Athletics | Amateur free agent signing |
| Jul 11, 1980 | Signed as free agent | Bill Almon | — | New York Mets | Free agent signing |
| Jul 11, 1980 | Trade | Dave Oliver | Cleveland Indians | Montreal Expos | Trade |
| Jul 11, 1980 | Trade | Ross Grimsley | Montreal Expos | Cleveland Indians | Trade |
| Jul 10, 1980 | Signed | Rafael Belliard | — | Pittsburgh Pirates | Amateur free agent signing |
| Jul 9, 1980 | Signed | Rick Grapenthin | — | Montreal Expos | Amateur free agent signing |
| Jul 8, 1980 | Signed as free agent | Vic Davalillo | — | Los Angeles Dodgers | Free agent signing |
| Jul 7, 1980 | Released | Bill Almon | Montreal Expos | — | Release |
| Jul 1, 1980 | Released | Paul Blair | New York Yankees | — | Release |
| Jul 1, 1980 | Trade | Randy Johnson | New York Mets | Atlanta Braves | Trade |
| Jul 1, 1980 | Trade | Bill Haslerig | Atlanta Braves | New York Mets | Trade |
| Jun 30, 1980 | Trade | Karl Pagel | Chicago Cubs | Cleveland Indians | Trade |
| Jun 24, 1980 | Released | Steve Ontiveros | Chicago Cubs | — | Release |
| Jun 24, 1980 | Released | Merv Rettenmund | California Angels | — | Release |
| Jun 23, 1980 | Signed | Trench Davis | — | Pittsburgh Pirates | Amateur free agent signing |
| Jun 23, 1980 | Trade | Randy McGilberry | Kansas City Royals | New York Mets | Trade |
| Jun 23, 1980 | Trade | Unnamed | Chicago Cubs | Cleveland Indians | $ |
| Jun 23, 1980 | Trade | Cliff Johnson | Cleveland Indians | Chicago Cubs | Trade |
| Jun 22, 1980 | Signed | Bill Landrum | — | Chicago Cubs | Amateur free agent signing |
| Jun 21, 1980 | Released | Jack Billingham | Boston Red Sox | — | Release |
| Jun 21, 1980 | Signed as free agent | Steve Braun | — | Toronto Blue Jays | Free agent signing |
| Jun 18, 1980 | Signed as free agent | Bob Randall | — | Minnesota Twins | Free agent signing |
| Jun 17, 1980 | Trade | Kevin Kobel | New York Mets | Kansas City Royals | Trade |
| Jun 16, 1980 | Signed | Mark Huismann | — | Kansas City Royals | Amateur free agent signing |
| Jun 15, 1980 | Signed | Ed Olwine | — | New York Yankees | Amateur free agent signing |
| Jun 14, 1980 | Signed | Paul Serna | — | Seattle Mariners | Amateur free agent signing |
| Jun 13, 1980 | Signed as free agent | Joe Nolan | — | Cincinnati Reds | Free agent signing |
| Jun 13, 1980 | Trade | Ron Pruitt | Cleveland Indians | Chicago White Sox | Trade |
| Jun 13, 1980 | Trade | Alan Bannister | Chicago White Sox | Cleveland Indians | Trade |
| Jun 12, 1980 | Signed as free agent | Rawly Eastwick | — | Kansas City Royals | Free agent signing |
| Jun 12, 1980 | Trade | Randy Scarbery | Chicago White Sox | California Angels | Trade |
| Jun 12, 1980 | Trade | Todd Cruz | California Angels | Chicago White Sox | Trade |
| Jun 10, 1980 | Signed | Doug Sisk | — | New York Mets | Amateur free agent signing |
| Jun 10, 1980 | Trade | Ken Schrom | California Angels | Toronto Blue Jays | Trade |
| Jun 10, 1980 | Trade | Dan Gonzales | Detroit Tigers | Baltimore Orioles | Trade |
| Jun 10, 1980 | Trade | Ed Putman | Detroit Tigers | Baltimore Orioles | Trade |
| Jun 10, 1980 | Trade | Larry Johnson | Baltimore Orioles | Detroit Tigers | Trade |
| Jun 10, 1980 | Trade | Larry Anderson | Baltimore Orioles | Detroit Tigers | Trade |
| Jun 10, 1980 | Trade | Billy Presley | Baltimore Orioles | Detroit Tigers | Trade |
| Jun 8, 1980 | Signed as free agent | Billy Smith | — | Philadelphia Phillies | Free agent signing |
| Jun 7, 1980 | Signed | Henry Cotto | — | Chicago Cubs | Amateur free agent signing |
| Jun 7, 1980 | Trade | Claudell Washington | Chicago White Sox | New York Mets | Trade |
| Jun 7, 1980 | Trade | Jesse Anderson | New York Mets | Chicago White Sox | Trade |
| Jun 6, 1980 | Signed | Barbaro Garbey | — | Detroit Tigers | Amateur free agent signing |
| Jun 6, 1980 | Released | Ralph Garr | California Angels | — | Release |
| Jun 6, 1980 | Released | Mike Marshall | Minnesota Twins | — | Release |
| Jun 3, 1980 | Released | Bob Randall | Minnesota Twins | — | Release |
| Jun 3, 1980 | Signed | Edwin Rodriguez | — | New York Yankees | Amateur free agent signing |
| Jun 3, 1980 | Trade | Dave Lemanczyk | Toronto Blue Jays | California Angels | Trade |
| Jun 2, 1980 | Released | Steve Braun | Kansas City Royals | — | Release |
| Jun 2, 1980 | Trade | John Martin | Detroit Tigers | St. Louis Cardinals | Trade |
| Jun 2, 1980 | Trade | Al Greene | Detroit Tigers | St. Louis Cardinals | Trade |
| Jun 2, 1980 | Trade | Jim Lentine | St. Louis Cardinals | Detroit Tigers | Trade |
| May 30, 1980 | Released | Ted Sizemore | Boston Red Sox | — | Release |
| May 28, 1980 | Signed as free agent | Paul Blair | — | New York Yankees | Free agent signing |
| May 27, 1980 | Released | Pedro Borbon | St. Louis Cardinals | — | Release |
| May 27, 1980 | Released | Bernie Carbo | St. Louis Cardinals | — | Release |
| May 27, 1980 | Trade | Jason Thompson | Detroit Tigers | California Angels | Trade |
| May 27, 1980 | Trade | Al Cowens | California Angels | Detroit Tigers | Trade |
| May 16, 1980 | Signed | Ramon Peña | — | Pittsburgh Pirates | Amateur free agent signing |
| May 16, 1980 | Signed as free agent | Chuck Porter | — | Milwaukee Brewers | Free agent signing |
| May 16, 1980 | Signed as free agent | Bob Randall | — | Minnesota Twins | Free agent signing |
| May 12, 1980 | Trade | Stan Papi | Boston Red Sox | Philadelphia Phillies | Trade |
| May 9, 1980 | Released | Darold Knowles | St. Louis Cardinals | — | Release |
| May 7, 1980 | Signed as free agent | Bud Harrelson | — | Texas Rangers | Free agent signing |
| May 5, 1980 | Signed as free agent | Rusty Torres | — | Kansas City Royals | Free agent signing |
| May 2, 1980 | Signed as free agent | Ricky Adams | — | California Angels | Free agent signing |
| Apr 30, 1980 | Signed as free agent | Pedro Borbon | — | St. Louis Cardinals | Free agent signing |
| Apr 29, 1980 | Signed as free agent | Doug Bird | — | New York Yankees | Free agent signing |
| Apr 29, 1980 | Signed | Juan Samuel | — | Philadelphia Phillies | Amateur free agent signing |
| Apr 28, 1980 | Signed as free agent | George Cappuzzello | — | Detroit Tigers | Free agent signing |
| Apr 28, 1980 | Signed | Luis Quinones | — | San Diego Padres | Amateur free agent signing |
| Apr 25, 1980 | Trade | Greg Field | Pittsburgh Pirates | Atlanta Braves | Trade |
| Apr 21, 1980 | Signed as free agent | Paul Hartzell | — | Baltimore Orioles | Free agent signing |
| Apr 14, 1980 | Signed as free agent | Manny Sarmiento | — | Seattle Mariners | Free agent signing |
| Apr 12, 1980 | Signed as free agent | Dyar Miller | — | New York Mets | Free agent signing |
| Apr 10, 1980 | Signed as free agent | Butch Edge | — | Atlanta Braves | Free agent signing (date approximate, per the source) |
| Apr 10, 1980 | Signed as free agent | Randy Elliott | — | Oakland Athletics | Free agent signing |
| Apr 10, 1980 | Signed as free agent | Mickey Mahler | — | Pittsburgh Pirates | Free agent signing |
| Apr 8, 1980 | Signed as free agent | Glenn Borgmann | — | Chicago White Sox | Free agent signing |
| Apr 8, 1980 | Released | George Cappuzzello | Cincinnati Reds | — | Release |
| Apr 7, 1980 | Signed as free agent | Roger Freed | — | Philadelphia Phillies | Free agent signing |
| Apr 7, 1980 | Signed as free agent | Jeff Little | — | St. Louis Cardinals | Free agent signing |
| Apr 6, 1980 | Signed as free agent | Kim Allen | — | Seattle Mariners | Free agent signing |
| Apr 6, 1980 | Signed as free agent | Danny Walton | — | Texas Rangers | Free agent signing |
| Apr 5, 1980 | Signed as free agent | Steve Luebber | — | Baltimore Orioles | Free agent signing |
| Apr 5, 1980 | Signed as free agent | Dale Mohorcic | — | Pittsburgh Pirates | Free agent signing |
| Apr 5, 1980 | Released | Eduardo Rodriguez | Kansas City Royals | — | Release |
| Apr 4, 1980 | Released | Ricky Adams | Houston Astros | — | Release |
| Apr 4, 1980 | Released | Doug Bird | Philadelphia Phillies | — | Release |
| Apr 4, 1980 | Released | Rawly Eastwick | Philadelphia Phillies | — | Release |
| Apr 4, 1980 | Released | Bud Harrelson | Philadelphia Phillies | — | Release |
| Apr 4, 1980 | Released | Ted Martinez | Los Angeles Dodgers | — | Release |
| Apr 4, 1980 | Signed as free agent | Dave McKay | — | Oakland Athletics | Free agent signing |
| Apr 4, 1980 | Signed as free agent | Johnny Oates | — | New York Yankees | Free agent signing |
| Apr 3, 1980 | Released | Pedro Borbon | San Francisco Giants | — | Release |
| Apr 3, 1980 | Released | Glenn Borgmann | Chicago White Sox | — | Release |
| Apr 3, 1980 | Released | Ray Fosse | Milwaukee Brewers | — | Release |
| Apr 3, 1980 | Released | Paul Hartzell | Minnesota Twins | — | Release |
| Apr 3, 1980 | Released | Rudy Meoli | San Francisco Giants | — | Release |
| Apr 3, 1980 | Released | Bob Randall | Minnesota Twins | — | Release |
| Apr 3, 1980 | Released | Billy Smith | Baltimore Orioles | — | Release |
| Apr 2, 1980 | Signed as free agent | Danny Boone | — | San Diego Padres | Free agent signing |
| Apr 2, 1980 | Released | Butch Edge | Toronto Blue Jays | — | Release |
| Apr 2, 1980 | Released | Roger Freed | St. Louis Cardinals | — | Release |
| Apr 2, 1980 | Released | Jeff Little | San Francisco Giants | — | Release |
| Apr 2, 1980 | Released | Manny Sarmiento | Cincinnati Reds | — | Release |
| Apr 1, 1980 | Released | Bruce Boisclair | New York Mets | — | Release |
| Apr 1, 1980 | Released | Dave Freisleben | California Angels | — | Release |
| Apr 1, 1980 | Released | Ike Hampton | California Angels | — | Release |
| Apr 1, 1980 | Signed as free agent | Jim Kaat | — | New York Yankees | Free agent signing |
| Apr 1, 1980 | Released | Orlando Ramirez | California Angels | — | Release |
| Apr 1, 1980 | Released | Rusty Torres | Chicago White Sox | — | Release |
| Apr 1, 1980 | Trade | Craig Eaton | Kansas City Royals | California Angels | Trade |
| Apr 1, 1980 | Trade | Unnamed | Pittsburgh Pirates | Seattle Mariners | $ |
| Apr 1, 1980 | Trade | Odell Jones | Seattle Mariners | Pittsburgh Pirates | Trade |
| Mar 31, 1980 | Released | Tom Bruno | St. Louis Cardinals | — | Release |
| Mar 31, 1980 | Released | David Clyde | Texas Rangers | — | Release |
| Mar 31, 1980 | Released | Will McEnaney | St. Louis Cardinals | — | Release |
| Mar 31, 1980 | Released | Chuck Porter | California Angels | — | Release |
| Mar 31, 1980 | Trade | LaRue Washington | Texas Rangers | Montreal Expos | Trade |
| Mar 31, 1980 | Trade | Chris Smith | Texas Rangers | Montreal Expos | Trade |
| Mar 31, 1980 | Trade | Rusty Staub | Montreal Expos | Texas Rangers | Trade |
| Mar 30, 1980 | Released | Danny Boone | California Angels | — | Release |
| Mar 30, 1980 | Trade | Unnamed | Boston Red Sox | Philadelphia Phillies | $ |
| Mar 30, 1980 | Trade | Dave Rader | Philadelphia Phillies | Boston Red Sox | Trade |
| Mar 29, 1980 | Released | Rico Carty | Toronto Blue Jays | — | Release |
| Mar 29, 1980 | Released | Steve Luebber | Toronto Blue Jays | — | Release |
| Mar 29, 1980 | Released | Mickey Mahler | Atlanta Braves | — | Release |
| Mar 29, 1980 | Released | Dan O'Brien | Seattle Mariners | — | Release |
| Mar 29, 1980 | Trade | Bud Anderson | Seattle Mariners | Cleveland Indians | Trade |
| Mar 28, 1980 | Signed as free agent | Dave Chalk | — | Kansas City Royals | Free agent signing |
| Mar 28, 1980 | Released | Roger Moret | Cleveland Indians | — | Release |
| Mar 28, 1980 | Trade | Eddie Solomon | Atlanta Braves | Pittsburgh Pirates | Trade |
| Mar 27, 1980 | Released | Ken Brett | Los Angeles Dodgers | — | Release |
| Mar 27, 1980 | Released | Johnny Oates | Los Angeles Dodgers | — | Release |
| Mar 26, 1980 | Trade | Ron Washington | Los Angeles Dodgers | Minnesota Twins | Trade |
| Mar 26, 1980 | Trade | Wayne Caughey | Minnesota Twins | Los Angeles Dodgers | Trade |
| Mar 25, 1980 | Released | Danny Walton | Seattle Mariners | — | Release |
| Mar 21, 1980 | Released | Jim Todd | Oakland Athletics | — | Release |
| Mar 21, 1980 | Released | Joe Wallis | Oakland Athletics | — | Release |
| Mar 20, 1980 | Signed as free agent | Lenny Randle | — | Seattle Mariners | Free agent signing |
| Mar 18, 1980 | Released | Jim Mason | Montreal Expos | — | Release |
| Mar 17, 1980 | Trade | Mike Barlow | California Angels | Toronto Blue Jays | Trade |
| Mar 17, 1980 | Trade | Mark Wiley | Toronto Blue Jays | California Angels | Trade |
| Mar 15, 1980 | Trade | Joe Pettini | Montreal Expos | San Francisco Giants | Trade |
| Mar 15, 1980 | Trade | Jerry Manuel | Detroit Tigers | Montreal Expos | Trade |
| Mar 15, 1980 | Trade | Duffy Dyer | Montreal Expos | Detroit Tigers | Trade |
| Mar 13, 1980 | Signed as free agent | Don Hood | — | St. Louis Cardinals | Free agent signing |
| Mar 13, 1980 | Signed as free agent | Rudy Meoli | — | San Francisco Giants | Free agent signing |
| Mar 10, 1980 | Signed | Jose Cano | — | New York Yankees | Amateur free agent signing |
| Mar 5, 1980 | Signed | Bill Johnson | — | Philadelphia Phillies | Amateur free agent signing |
| Mar 3, 1980 | Released | Dyar Miller | Montreal Expos | — | Release |
| Feb 29, 1980 | Signed as free agent | Keith Comstock | — | Oakland Athletics | Free agent signing |
| Feb 28, 1980 | Signed as free agent | Luis Aponte | — | Boston Red Sox | Free agent signing |
| Feb 27, 1980 | Signed | Jim Scranton | — | Kansas City Royals | Amateur free agent signing |
| Feb 26, 1980 | Signed as free agent | Tom Dixon | — | New York Mets | Free agent signing |
| Feb 22, 1980 | Signed as free agent | Rob Andrews | — | New York Mets | Free agent signing |
| Feb 21, 1980 | Released | Frank Riccelli | Houston Astros | — | Release |
| Feb 20, 1980 | Signed as free agent | Dave Hamilton | — | Oakland Athletics | Free agent signing |
| Feb 20, 1980 | Trade | Reggie Baldwin | Houston Astros | New York Mets | Trade |
| Feb 20, 1980 | Trade | Keith Bodie | New York Mets | Houston Astros | Trade |
| Feb 19, 1980 | Signed as free agent | Rusty Torres | — | Chicago White Sox | Free agent signing |
| Feb 15, 1980 | Released | Fernando Gonzalez | San Diego Padres | — | Release |
| Feb 15, 1980 | Trade | Gary Melson | Cleveland Indians | Atlanta Braves | Trade |
| Feb 15, 1980 | Trade | Don Collins | Atlanta Braves | Cleveland Indians | Trade |
| Feb 15, 1980 | Trade | Willie Montanez | Texas Rangers | San Diego Padres | Trade |
| Feb 15, 1980 | Trade | Gaylord Perry | San Diego Padres | Texas Rangers | Trade |
| Feb 15, 1980 | Trade | Tucker Ashford | San Diego Padres | Texas Rangers | Trade |
| Feb 15, 1980 | Trade | Joe Carroll | San Diego Padres | Texas Rangers | Trade |
| Feb 15, 1980 | Trade | Jerry Mumphrey | Cleveland Indians | San Diego Padres | Trade |
| Feb 15, 1980 | Trade | Bob Owchinko | San Diego Padres | Cleveland Indians | Trade |
| Feb 15, 1980 | Trade | Jim Wilhelm | San Diego Padres | Cleveland Indians | Trade |
| Feb 8, 1980 | Released | Tom Dixon | Houston Astros | — | Release |
| Feb 5, 1980 | Released | Derek Botelho | Chicago Cubs | — | Release |
| Feb 2, 1980 | Signed | Rafael Montalvo | — | Los Angeles Dodgers | Amateur free agent signing |
| Jan 31, 1980 | Signed as free agent | Lerrin LaGrow | — | Philadelphia Phillies | Free agent signing |
| Jan 31, 1980 | Signed as free agent | Joe Morgan | — | Houston Astros | Free agent signing |
| Jan 30, 1980 | Signed as free agent | Roger Moret | — | Cleveland Indians | Free agent signing |
| Jan 29, 1980 | Signed as free agent | Glenn Borgmann | — | Chicago White Sox | Free agent signing |
| Jan 26, 1980 | Signed as free agent | Leo Garcia | — | Chicago White Sox | Free agent signing with first major-league team |
| Jan 24, 1980 | Signed as free agent | Jim Nettles | — | New York Yankees | Free agent signing |
| Jan 20, 1980 | Signed as free agent | John Hale | — | Cincinnati Reds | Free agent signing |
| Jan 20, 1980 | Signed | Angel Salazar | — | Montreal Expos | Amateur free agent signing |
| Jan 18, 1980 | Signed as free agent | Juan Agosto | — | Chicago White Sox | Free agent signing |
| Jan 15, 1980 | Signed | Carlos Ponce | — | Milwaukee Brewers | Amateur free agent signing |
| Jan 15, 1980 | Signed | Gil Reyes | — | Los Angeles Dodgers | Amateur free agent signing |
| Jan 15, 1980 | Trade | Joe Zdeb | Kansas City Royals | Chicago White Sox | Trade |
| Jan 15, 1980 | Trade | Eddie Bane | Chicago White Sox | Kansas City Royals | Trade |
| Jan 10, 1980 | Signed as free agent | Jack Kucek | — | Toronto Blue Jays | Free agent signing |
| Jan 8, 1980 | Released | Dale Mohorcic | Toronto Blue Jays | — | Release |
| Jan 6, 1980 | Signed as free agent | Albert Williams | — | Minnesota Twins | Free agent signing |
| Jan 5, 1980 | Signed as free agent | Tom Candiotti | — | Kansas City Royals | Free agent signing with first major-league team |
| Jan 4, 1980 | Trade | Larry McCall | Texas Rangers | Cleveland Indians | Trade |
| Jan 4, 1980 | Trade | Gary Gray | Texas Rangers | Cleveland Indians | Trade |
| Jan 4, 1980 | Trade | Mike Bucci | Texas Rangers | Cleveland Indians | Trade |
| Jan 4, 1980 | Trade | David Clyde | Cleveland Indians | Texas Rangers | Trade |
| Jan 4, 1980 | Trade | Jim Norris | Cleveland Indians | Texas Rangers | Trade |
| before the 1980 season | Released | Larry Anderson | Atlanta Braves | — | Release |
| before the 1980 season | Signed as free agent | Larry Anderson | — | Baltimore Orioles | Free agent signing |
| before the 1980 season | Signed as free agent | Dave Freisleben | — | California Angels | Free agent signing |
| before the 1980 season | Released | Jim Gideon | Minnesota Twins | — | Release |
| before the 1980 season | Released | Rudy Meoli | Minnesota Twins | — | Release |
| before the 1980 season | Released | Leroy Stanton | Seattle Mariners | — | Release |
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.