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The 1977 season’s official transaction log: 492 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 31, 1977 | Signed as free agent | Ray Fosse | — | Milwaukee Brewers | Free agent signing |
| Dec 27, 1977 | Signed as free agent | Dick Drago | — | Boston Red Sox | Free agent signing |
| Dec 21, 1977 | Signed as free agent | Ross Grimsley | — | Montreal Expos | Free agent signing |
| Dec 21, 1977 | Signed as free agent | Rick Miller | — | California Angels | Free agent signing |
| Dec 20, 1977 | Signed as free agent | Bruce Bochte | — | Seattle Mariners | Free agent signing |
| Dec 20, 1977 | Signed | German Rivera | — | Los Angeles Dodgers | Amateur free agent signing |
| Dec 19, 1977 | Signed as free agent | Jesus Alou | — | Houston Astros | Free agent signing |
| Dec 16, 1977 | Trade | John Scott | Toronto Blue Jays | St. Louis Cardinals | Trade |
| Dec 15, 1977 | Signed as free agent | Mario Guerrero | — | San Francisco Giants | Free agent signing |
| Dec 15, 1977 | Trade | Rex Hudson | Los Angeles Dodgers | Minnesota Twins | Trade |
| Dec 15, 1977 | Trade | Bill Butler | Minnesota Twins | Los Angeles Dodgers | Trade |
| Dec 14, 1977 | Released | Ken McMullen | Milwaukee Brewers | — | Release |
| Dec 14, 1977 | Trade | Unnamed | Texas Rangers | Boston Red Sox | $ |
| Dec 14, 1977 | Trade | John Poloni | Texas Rangers | Boston Red Sox | Trade |
| Dec 14, 1977 | Trade | Fergie Jenkins | Boston Red Sox | Texas Rangers | Trade |
| Dec 13, 1977 | Released | Steve Hargan | Atlanta Braves | — | Release |
| Dec 12, 1977 | Released | Mark DeJohn | New York Mets | — | Release |
| Dec 12, 1977 | Signed as free agent | Mike Eden | — | Chicago White Sox | Free agent signing |
| Dec 12, 1977 | Trade | Unnamed | New York Yankees | Chicago White Sox | $ |
| Dec 12, 1977 | Trade | Stan Thomas | New York Yankees | Chicago White Sox | Trade |
| Dec 12, 1977 | Trade | Ed Ricks | New York Yankees | Chicago White Sox | Trade |
| Dec 12, 1977 | Trade | Jim Spencer | Chicago White Sox | New York Yankees | Trade |
| Dec 12, 1977 | Trade | Tommy Cruz | Chicago White Sox | New York Yankees | Trade |
| Dec 12, 1977 | Trade | Bob Polinsky | Chicago White Sox | New York Yankees | Trade |
| Dec 11, 1977 | Signed as free agent | Reggie Walton | — | Seattle Mariners | Free agent signing |
| Dec 10, 1977 | Released | Gary Sutherland | San Diego Padres | — | Release |
| Dec 9, 1977 | Signed as free agent | Rawly Eastwick | — | New York Yankees | Free agent signing |
| Dec 9, 1977 | Trade | Dave Collins | Seattle Mariners | Cincinnati Reds | Trade |
| Dec 9, 1977 | Trade | Shane Rawley | Cincinnati Reds | Seattle Mariners | Trade |
| Dec 9, 1977 | Trade | Ron Selak | Houston Astros | St. Louis Cardinals | Trade |
| Dec 9, 1977 | Trade | Randy Wiles | St. Louis Cardinals | Houston Astros | Trade |
| Dec 9, 1977 | Trade | Sergio Ferrer | New York Yankees | New York Mets | Trade |
| Dec 9, 1977 | Trade | Roy Staiger | New York Mets | New York Yankees | Trade |
| Dec 9, 1977 | Trade | Garry Hancock | Cleveland Indians | Boston Red Sox | Trade |
| Dec 9, 1977 | Trade | Jack Baker | Boston Red Sox | Cleveland Indians | Trade |
| Dec 9, 1977 | Trade | Tom Veryzer | Detroit Tigers | Cleveland Indians | Trade |
| Dec 9, 1977 | Trade | Charlie Spikes | Cleveland Indians | Detroit Tigers | Trade |
| Dec 9, 1977 | Trade | Jim Slaton | Milwaukee Brewers | Detroit Tigers | Trade |
| Dec 9, 1977 | Trade | Rich Folkers | Milwaukee Brewers | Detroit Tigers | Trade |
| Dec 9, 1977 | Trade | Ben Oglivie | Detroit Tigers | Milwaukee Brewers | Trade |
| Dec 8, 1977 | Trade | Unnamed | Chicago Cubs | St. Louis Cardinals | $ |
| Dec 8, 1977 | Trade | Dave Rader | St. Louis Cardinals | Chicago Cubs | Trade |
| Dec 8, 1977 | Trade | Hector Cruz | St. Louis Cardinals | Chicago Cubs | Trade |
| Dec 8, 1977 | Trade | Jerry Morales | Chicago Cubs | St. Louis Cardinals | Trade |
| Dec 8, 1977 | Trade | Steve Swisher | Chicago Cubs | St. Louis Cardinals | Trade |
| Dec 8, 1977 | Trade | Adrian Devine | Texas Rangers | Atlanta Braves | Trade |
| Dec 8, 1977 | Trade | Tommy Boggs | Texas Rangers | Atlanta Braves | Trade |
| Dec 8, 1977 | Trade | Eddie Miller | Texas Rangers | Atlanta Braves | Trade |
| Dec 8, 1977 | Trade | Willie Montanez | Atlanta Braves | New York Mets | Trade |
| Dec 8, 1977 | Trade | Tom Grieve | Texas Rangers | New York Mets | Trade |
| Dec 8, 1977 | Trade | Jon Matlack | New York Mets | Texas Rangers | Trade |
| Dec 8, 1977 | Trade | John Milner | New York Mets | Pittsburgh Pirates | Trade |
| Dec 8, 1977 | Trade | Bert Blyleven | Texas Rangers | Pittsburgh Pirates | Trade |
| Dec 8, 1977 | Trade | Al Oliver | Pittsburgh Pirates | Texas Rangers | Trade |
| Dec 8, 1977 | Trade | Nelson Norman | Pittsburgh Pirates | Texas Rangers | Trade |
| Dec 8, 1977 | Trade | Al Hrabosky | St. Louis Cardinals | Kansas City Royals | Trade |
| Dec 8, 1977 | Trade | Mark Littell | Kansas City Royals | St. Louis Cardinals | Trade |
| Dec 8, 1977 | Trade | Buck Martinez | Kansas City Royals | St. Louis Cardinals | Trade |
| Dec 8, 1977 | Trade | George Frazier | Milwaukee Brewers | St. Louis Cardinals | Trade |
| Dec 8, 1977 | Trade | Buck Martinez | St. Louis Cardinals | Milwaukee Brewers | Trade |
| Dec 8, 1977 | Trade | Unnamed | Boston Red Sox | California Angels | $ |
| Dec 8, 1977 | Trade | Jerry Remy | California Angels | Boston Red Sox | Trade |
| Dec 8, 1977 | Trade | Don Aase | Boston Red Sox | California Angels | Trade |
| Dec 8, 1977 | Trade | Ron Fairly | Toronto Blue Jays | California Angels | Trade |
| Dec 8, 1977 | Trade | Pat Kelly | California Angels | Toronto Blue Jays | Trade |
| Dec 8, 1977 | Trade | Butch Alberts | California Angels | Toronto Blue Jays | Trade |
| Dec 7, 1977 | Signed as free agent | Horace Speed | — | Cleveland Indians | Free agent signing |
| Dec 7, 1977 | Trade | Rudy May | Baltimore Orioles | Montreal Expos | Trade |
| Dec 7, 1977 | Trade | Randy Miller | Baltimore Orioles | Montreal Expos | Trade |
| Dec 7, 1977 | Trade | Bryn Smith | Baltimore Orioles | Montreal Expos | Trade |
| Dec 7, 1977 | Trade | Don Stanhouse | Montreal Expos | Baltimore Orioles | Trade |
| Dec 7, 1977 | Trade | Joe Kerrigan | Montreal Expos | Baltimore Orioles | Trade |
| Dec 7, 1977 | Trade | Gary Roenicke | Montreal Expos | Baltimore Orioles | Trade |
| Dec 7, 1977 | Trade | Carlos Lopez | Seattle Mariners | Baltimore Orioles | Trade |
| Dec 7, 1977 | Trade | Tommy Moore | Seattle Mariners | Baltimore Orioles | Trade |
| Dec 7, 1977 | Trade | Mike Parrott | Baltimore Orioles | Seattle Mariners | Trade |
| Dec 6, 1977 | Trade | Pete Vuckovich | Toronto Blue Jays | St. Louis Cardinals | Trade |
| Dec 6, 1977 | Trade | Tom Underwood | St. Louis Cardinals | Toronto Blue Jays | Trade |
| Dec 6, 1977 | Trade | Victor Cruz | St. Louis Cardinals | Toronto Blue Jays | Trade |
| Dec 5, 1977 | Trade | Norm Churchill | Cleveland Indians | Chicago Cubs | Trade |
| Dec 5, 1977 | Trade | Bruce Compton | Cleveland Indians | Chicago Cubs | Trade |
| Dec 5, 1977 | Trade | Dave Rosello | Chicago Cubs | Cleveland Indians | Trade |
| Dec 5, 1977 | Trade | Jimmy Sexton | Seattle Mariners | Houston Astros | Trade |
| Dec 5, 1977 | Trade | Leon Roberts | Houston Astros | Seattle Mariners | Trade |
| Dec 5, 1977 | Trade | Jim Otten | Chicago White Sox | St. Louis Cardinals | Trade |
| Dec 5, 1977 | Trade | Stan Butkus | St. Louis Cardinals | Chicago White Sox | Trade |
| Dec 5, 1977 | Trade | Brian Downing | Chicago White Sox | California Angels | Trade |
| Dec 5, 1977 | Trade | Chris Knapp | Chicago White Sox | California Angels | Trade |
| Dec 5, 1977 | Trade | Dave Frost | Chicago White Sox | California Angels | Trade |
| Dec 5, 1977 | Trade | Bobby Bonds | California Angels | Chicago White Sox | Trade |
| Dec 5, 1977 | Trade | Thad Bosley | California Angels | Chicago White Sox | Trade |
| Dec 5, 1977 | Trade | Richard Dotson | California Angels | Chicago White Sox | Trade |
| Dec 3, 1977 | Signed as free agent | Ron Schueler | — | Chicago White Sox | Free agent signing |
| Nov 30, 1977 | Signed as free agent | Jack Brohamer | — | Boston Red Sox | Free agent signing |
| Nov 30, 1977 | Signed as free agent | Dave Kingman | — | Chicago Cubs | Free agent signing |
| Nov 30, 1977 | Signed as free agent | Elliott Maddox | — | New York Mets | Free agent signing |
| Nov 29, 1977 | Signed as free agent | Oscar Gamble | — | San Diego Padres | Free agent signing |
| Nov 29, 1977 | Signed as free agent | Jerry Terrell | — | Kansas City Royals | Free agent signing |
| Nov 28, 1977 | Signed as free agent | Eddie Bane | — | Chicago White Sox | Free agent signing |
| Nov 28, 1977 | Signed as free agent | Rich Hinton | — | Chicago White Sox | Free agent signing |
| Nov 28, 1977 | Signed as free agent | Junior Moore | — | Chicago White Sox | Free agent signing |
| Nov 28, 1977 | Signed as free agent | Greg Pryor | — | Chicago White Sox | Free agent signing |
| Nov 28, 1977 | Trade | Dave Hamilton | Chicago White Sox | St. Louis Cardinals | Trade |
| Nov 28, 1977 | Trade | Silvio Martinez | Chicago White Sox | St. Louis Cardinals | Trade |
| Nov 24, 1977 | Signed as free agent | Larry Johnson | — | Chicago White Sox | Free agent signing |
| Nov 23, 1977 | Signed as free agent | Elrod Hendricks | — | Baltimore Orioles | Free agent signing |
| Nov 23, 1977 | Signed as free agent | Mike Torrez | — | Boston Red Sox | Free agent signing |
| Nov 23, 1977 | Trade | Dave Bergman | New York Yankees | Houston Astros | Trade |
| Nov 22, 1977 | Signed as free agent | Terry Forster | — | Los Angeles Dodgers | Free agent signing |
| Nov 22, 1977 | Signed as free agent | Rich Gossage | — | New York Yankees | Free agent signing |
| Nov 22, 1977 | Signed as free agent | Mike Proly | — | Chicago White Sox | Free agent signing |
| Nov 22, 1977 | Signed as free agent | Mac Scarce | — | Minnesota Twins | Free agent signing |
| Nov 21, 1977 | Signed as free agent | Lyman Bostock | — | California Angels | Free agent signing |
| Nov 21, 1977 | Signed | Luis DeLeon | — | St. Louis Cardinals | Amateur free agent signing |
| Nov 21, 1977 | Signed as free agent | Tom Hausman | — | New York Mets | Free agent signing |
| Nov 18, 1977 | Signed as free agent | Oscar Zamora | — | Houston Astros | Free agent signing |
| Nov 17, 1977 | Signed as free agent | Ron Blomberg | — | Chicago White Sox | Free agent signing |
| Nov 17, 1977 | Signed as free agent | Larry Hisle | — | Milwaukee Brewers | Free agent signing |
| Nov 14, 1977 | Signed as free agent | Jim Hughes | — | Chicago White Sox | Free agent signing |
| Nov 11, 1977 | Released | Dave Giusti | Chicago Cubs | — | Release |
| Nov 11, 1977 | Signed as free agent | Luis Gomez | — | Toronto Blue Jays | Free agent signing |
| Nov 11, 1977 | Signed as free agent | Doc Medich | — | Texas Rangers | Free agent signing |
| Nov 11, 1977 | Signed as free agent | Bob Robertson | — | Seattle Mariners | Free agent signing |
| Nov 9, 1977 | Signed as free agent | Richie Zisk | — | Texas Rangers | Free agent signing |
| Nov 6, 1977 | Signed as free agent | Randy Scarbery | — | Chicago White Sox | Free agent signing |
| Oct 31, 1977 | Trade | Bill Bonham | Chicago Cubs | Cincinnati Reds | Trade |
| Oct 31, 1977 | Trade | Woodie Fryman | Cincinnati Reds | Chicago Cubs | Trade |
| Oct 31, 1977 | Trade | Bill Caudill | Cincinnati Reds | Chicago Cubs | Trade |
| Oct 28, 1977 | Released | Jim Wynn | Milwaukee Brewers | — | Release |
| Oct 27, 1977 | Signed as free agent | Willie Royster | — | Baltimore Orioles | Free agent signing |
| Oct 26, 1977 | Released | Jim Shellenback | Minnesota Twins | — | Release |
| Oct 25, 1977 | Signed | Wil Culmer | — | Philadelphia Phillies | Amateur free agent signing |
| Oct 25, 1977 | Released | Phil Roof | Toronto Blue Jays | — | Release |
| Oct 25, 1977 | Trade | Jim Todd | Chicago Cubs | Seattle Mariners | Trade |
| Oct 25, 1977 | Trade | Gorman Thomas | Milwaukee Brewers | Texas Rangers | Trade |
| Oct 25, 1977 | Trade | Jose Cardenal | Chicago Cubs | Philadelphia Phillies | Trade |
| Oct 25, 1977 | Trade | Manny Seoane | Philadelphia Phillies | Chicago Cubs | Trade |
| Oct 25, 1977 | Trade | Larry Cox | Seattle Mariners | Chicago Cubs | Trade |
| Oct 25, 1977 | Trade | Steve Hamrick | Chicago Cubs | Seattle Mariners | Trade |
| Oct 25, 1977 | Trade | Frank Riccelli | San Francisco Giants | St. Louis Cardinals | Trade |
| Oct 24, 1977 | Trade | Daniel Smith | Los Angeles Dodgers | New York Mets | Trade |
| Oct 24, 1977 | Trade | Randy Rogers | Los Angeles Dodgers | New York Mets | Trade |
| Oct 14, 1977 | Released | Ron Clark | Philadelphia Phillies | — | Release |
| Oct 13, 1977 | Trade | Al Javier | Houston Astros | Chicago Cubs | Trade |
| Oct 13, 1977 | Trade | Keith Drumright | Chicago Cubs | Houston Astros | Trade |
| Oct 12, 1977 | Released | Randy Hundley | Chicago Cubs | — | Release |
| Oct 10, 1977 | Released | Cookie Rojas | Kansas City Royals | — | Release |
| Oct 3, 1977 | Released | Joe Hoerner | Cincinnati Reds | — | Release |
| Oct 3, 1977 | Released | Jim Hughes | Minnesota Twins | — | Release |
| Oct 3, 1977 | Released | Steve Luebber | Minnesota Twins | — | Release |
| Sep 29, 1977 | Released | Tony LaRussa | St. Louis Cardinals | — | Release |
| Sep 19, 1977 | Trade | Unnamed | Boston Red Sox | Cincinnati Reds | $ |
| Sep 19, 1977 | Trade | Breen Newcomer | Boston Red Sox | Cincinnati Reds | Trade |
| Sep 19, 1977 | Trade | Bob Bailey | Cincinnati Reds | Boston Red Sox | Trade |
| Sep 16, 1977 | Trade | Bob Detherage | Houston Astros | Los Angeles Dodgers | Trade |
| Sep 15, 1977 | Trade | Unnamed | New York Yankees | California Angels | $ |
| Sep 15, 1977 | Trade | Randy Stein | New York Yankees | California Angels | Trade |
| Sep 15, 1977 | Trade | Dave Kingman | California Angels | New York Yankees | Trade |
| Sep 14, 1977 | Released | Carl Morton | Philadelphia Phillies | — | Release |
| Sep 13, 1977 | Signed as free agent | Jim Dwyer | — | St. Louis Cardinals | Free agent signing |
| Sep 12, 1977 | Signed as free agent | Keith MacWhorter | — | Boston Red Sox | Free agent signing |
| Sep 9, 1977 | Trade | Unnamed | Seattle Mariners | Cleveland Indians | $ |
| Sep 9, 1977 | Trade | Bill Laxton | Seattle Mariners | Cleveland Indians | Trade |
| Sep 9, 1977 | Trade | Ray Fosse | Cleveland Indians | Seattle Mariners | Trade |
| Sep 7, 1977 | Released | Jim Dwyer | Chicago Cubs | — | Release |
| Sep 6, 1977 | Trade | Dennis Blair | Montreal Expos | Baltimore Orioles | Trade |
| Sep 5, 1977 | Trade | Danny Walton | Los Angeles Dodgers | Houston Astros | Trade |
| Sep 5, 1977 | Trade | Alex Taveras | Houston Astros | Los Angeles Dodgers | Trade |
| Sep 2, 1977 | Trade | Nyls Nyman | Chicago White Sox | St. Louis Cardinals | Trade |
| Aug 31, 1977 | Released | Boog Powell | Los Angeles Dodgers | — | Release |
| Aug 31, 1977 | Trade | Clay Carroll | St. Louis Cardinals | Chicago White Sox | Trade |
| Aug 31, 1977 | Trade | Jerry Grote | New York Mets | Los Angeles Dodgers | Trade |
| Aug 25, 1977 | Released | Bruce Dal Canton | Chicago White Sox | — | Release |
| Aug 23, 1977 | Released | Bobby Darwin | Chicago Cubs | — | Release |
| Aug 22, 1977 | Trade | Rick Honeycutt | Pittsburgh Pirates | Seattle Mariners | Trade |
| Aug 20, 1977 | Released | Ramon Hernandez | Boston Red Sox | — | Release |
| Aug 20, 1977 | Trade | Steve Staniland | Chicago White Sox | St. Louis Cardinals | Trade |
| Aug 20, 1977 | Trade | Don Kessinger | St. Louis Cardinals | Chicago White Sox | Trade |
| Aug 20, 1977 | Trade | Ed Kirkpatrick | Texas Rangers | Milwaukee Brewers | Trade |
| Aug 18, 1977 | Signed | Doug Frobel | — | Pittsburgh Pirates | Amateur free agent signing |
| Aug 18, 1977 | Signed | Kevin Hickey | — | Chicago White Sox | Amateur free agent signing |
| Aug 18, 1977 | Trade | Unnamed | Chicago White Sox | Chicago Cubs | $ |
| Aug 18, 1977 | Trade | Larry Anderson | Chicago White Sox | Chicago Cubs | Trade |
| Aug 18, 1977 | Trade | Steve Renko | Chicago Cubs | Chicago White Sox | Trade |
| Aug 16, 1977 | Released | Stan Perzanowski | California Angels | — | Release |
| Aug 12, 1977 | Trade | Randy Scarbery | Oakland Athletics | St. Louis Cardinals | Trade |
| Aug 12, 1977 | Trade | Steve Dunning | St. Louis Cardinals | Oakland Athletics | Trade |
| Aug 11, 1977 | Signed | Gorman Heimueller | — | San Francisco Giants | Amateur free agent signing |
| Aug 5, 1977 | Signed | Bob Dernier | — | Philadelphia Phillies | Amateur free agent signing |
| Aug 5, 1977 | Signed | Rich Gedman | — | Boston Red Sox | Amateur free agent signing |
| Aug 1977 | Signed as free agent | Jim Shellenback | — | Minnesota Twins | Free agent signing |
| Jul 27, 1977 | Trade | Dave Pagan | Seattle Mariners | Pittsburgh Pirates | Trade |
| Jul 26, 1977 | Released | Steve Kline | Atlanta Braves | — | Release |
| Jul 26, 1977 | Signed as free agent | Jim Wynn | — | Milwaukee Brewers | Free agent signing |
| Jul 21, 1977 | Released | Al Downing | Los Angeles Dodgers | — | Release |
| Jul 15, 1977 | Released | Mike Hegan | Milwaukee Brewers | — | Release |
| Jul 14, 1977 | Released | Jim Wynn | New York Yankees | — | Release |
| Jul 14, 1977 | Trade | Fred Holdsworth | Baltimore Orioles | Montreal Expos | Trade |
| Jul 11, 1977 | Signed | Frank DiPino | — | Milwaukee Brewers | Amateur free agent signing |
| Jul 5, 1977 | Signed as free agent | Pedro Garcia | — | San Diego Padres | Free agent signing |
| Jul 5, 1977 | Signed | Ron Kittle | — | Los Angeles Dodgers | Amateur free agent signing |
| Jul 5, 1977 | Released | Jose Uribe | New York Yankees | — | Release |
| Jul 4, 1977 | Released | Joe Decker | Chicago Cubs | — | Release |
| Jun 27, 1977 | Released | Pedro Garcia | Toronto Blue Jays | — | Release |
| Jun 25, 1977 | Signed | Chris Nyman | — | Chicago White Sox | Amateur free agent signing |
| Jun 22, 1977 | Released | Luis Alvarado | Detroit Tigers | — | Release |
| Jun 22, 1977 | Signed | Jim Lewis | — | Seattle Mariners | Amateur free agent signing |
| Jun 22, 1977 | Signed | Joe Pettini | — | Montreal Expos | Amateur free agent signing |
| Jun 21, 1977 | Released | Doug Griffin | Boston Red Sox | — | Release |
| Jun 21, 1977 | Signed as free agent | Tommy Helms | — | Boston Red Sox | Free agent signing |
| Jun 20, 1977 | Signed | Steve Lubratich | — | California Angels | Amateur free agent signing |
| Jun 18, 1977 | Released | Joe Torre | New York Mets | — | Release |
| Jun 17, 1977 | Signed as free agent | Greg Wells | — | Toronto Blue Jays | Free agent signing |
| Jun 16, 1977 | Signed | Tom Runnells | — | San Francisco Giants | Amateur free agent signing |
| Jun 15, 1977 | Trade | Tom Seaver | New York Mets | Cincinnati Reds | Trade |
| Jun 15, 1977 | Trade | Pat Zachry | Cincinnati Reds | New York Mets | Trade |
| Jun 15, 1977 | Trade | Doug Flynn | Cincinnati Reds | New York Mets | Trade |
| Jun 15, 1977 | Trade | Steve Henderson | Cincinnati Reds | New York Mets | Trade |
| Jun 15, 1977 | Trade | Dan Norman | Cincinnati Reds | New York Mets | Trade |
| Jun 15, 1977 | Trade | Craig Hendrickson | California Angels | Cincinnati Reds | Trade |
| Jun 15, 1977 | Trade | Gary Nolan | Cincinnati Reds | California Angels | Trade |
| Jun 15, 1977 | Trade | Doug Capilla | St. Louis Cardinals | Cincinnati Reds | Trade |
| Jun 15, 1977 | Trade | Rawly Eastwick | Cincinnati Reds | St. Louis Cardinals | Trade |
| Jun 15, 1977 | Trade | Rick O'Keeffe | Milwaukee Brewers | Cincinnati Reds | Trade |
| Jun 15, 1977 | Trade | Garry Pyka | Milwaukee Brewers | Cincinnati Reds | Trade |
| Jun 15, 1977 | Trade | Mike Caldwell | Cincinnati Reds | Milwaukee Brewers | Trade |
| Jun 15, 1977 | Trade | Bake McBride | St. Louis Cardinals | Philadelphia Phillies | Trade |
| Jun 15, 1977 | Trade | Steve Waterbury | St. Louis Cardinals | Philadelphia Phillies | Trade |
| Jun 15, 1977 | Trade | Tom Underwood | Philadelphia Phillies | St. Louis Cardinals | Trade |
| Jun 15, 1977 | Trade | Dane Iorg | Philadelphia Phillies | St. Louis Cardinals | Trade |
| Jun 15, 1977 | Trade | Rick Bosetti | Philadelphia Phillies | St. Louis Cardinals | Trade |
| Jun 15, 1977 | Trade | Barry Foote | Montreal Expos | Philadelphia Phillies | Trade |
| Jun 15, 1977 | Trade | Dan Warthen | Montreal Expos | Philadelphia Phillies | Trade |
| Jun 15, 1977 | Trade | Wayne Twitchell | Philadelphia Phillies | Montreal Expos | Trade |
| Jun 15, 1977 | Trade | Tim Blackwell | Philadelphia Phillies | Montreal Expos | Trade |
| Jun 15, 1977 | Trade | Jim Fregosi | Texas Rangers | Pittsburgh Pirates | Trade |
| Jun 15, 1977 | Trade | Ed Kirkpatrick | Pittsburgh Pirates | Texas Rangers | Trade |
| Jun 15, 1977 | Trade | Mike Phillips | New York Mets | St. Louis Cardinals | Trade |
| Jun 15, 1977 | Trade | Joel Youngblood | St. Louis Cardinals | New York Mets | Trade |
| Jun 15, 1977 | Trade | Bobby Valentine | San Diego Padres | New York Mets | Trade |
| Jun 15, 1977 | Trade | Paul Siebert | San Diego Padres | New York Mets | Trade |
| Jun 15, 1977 | Trade | Dave Kingman | New York Mets | San Diego Padres | Trade |
| Jun 15, 1977 | Trade | Randy Niemann | New York Yankees | Houston Astros | Trade |
| Jun 15, 1977 | Trade | Mike Fischlin | New York Yankees | Houston Astros | Trade |
| Jun 15, 1977 | Trade | Cliff Johnson | Houston Astros | New York Yankees | Trade |
| Jun 15, 1977 | Trade | Unnamed | Oakland Athletics | Houston Astros | $ |
| Jun 15, 1977 | Trade | Denny Walling | Oakland Athletics | Houston Astros | Trade |
| Jun 15, 1977 | Trade | Willie Crawford | Houston Astros | Oakland Athletics | Trade |
| Jun 15, 1977 | Trade | Ken Brett | Chicago White Sox | California Angels | Trade |
| Jun 15, 1977 | Trade | Don Kirkwood | California Angels | Chicago White Sox | Trade |
| Jun 15, 1977 | Trade | John Verhoeven | California Angels | Chicago White Sox | Trade |
| Jun 15, 1977 | Trade | John Flannery | California Angels | Chicago White Sox | Trade |
| Jun 14, 1977 | Released | Tom Hall | Kansas City Royals | — | Release |
| Jun 14, 1977 | Signed as free agent | Tom Hall | — | Minnesota Twins | Free agent signing |
| Jun 14, 1977 | Released | Tommy Helms | Pittsburgh Pirates | — | Release |
| Jun 14, 1977 | Signed | Jeff Reardon | — | New York Mets | Amateur free agent signing |
| Jun 13, 1977 | Trade | Dick Drago | California Angels | Baltimore Orioles | Trade |
| Jun 13, 1977 | Trade | Dyar Miller | Baltimore Orioles | California Angels | Trade |
| Jun 10, 1977 | Signed as free agent | Bobby Tolan | — | Pittsburgh Pirates | Free agent signing |
| Jun 7, 1977 | Released | Bob Johnson | Atlanta Braves | — | Release |
| Jun 1, 1977 | Released | Jim Bouton | Chicago White Sox | — | Release |
| Jun 1977 | Signed as free agent | Steve Kline | — | Atlanta Braves | Free agent signing (date approximate, per the source) |
| May 28, 1977 | Signed as free agent | Terry Leach | — | Atlanta Braves | Free agent signing with first major-league team |
| May 28, 1977 | Trade | Bobby Darwin | Boston Red Sox | Chicago Cubs | Trade |
| May 28, 1977 | Trade | Ramon Hernandez | Chicago Cubs | Boston Red Sox | Trade |
| May 27, 1977 | Signed as free agent | Tim Ireland | — | Kansas City Royals | Free agent signing |
| May 27, 1977 | Trade | Shane Rawley | Montreal Expos | Cincinnati Reds | Trade |
| May 27, 1977 | Trade | Angel Torres | Montreal Expos | Cincinnati Reds | Trade |
| May 25, 1977 | Released | Tim Ireland | Chicago Cubs | — | Release |
| May 25, 1977 | Released | Bobby Tolan | Philadelphia Phillies | — | Release |
| May 24, 1977 | Trade | Eddie Solomon | St. Louis Cardinals | Atlanta Braves | Trade |
| May 24, 1977 | Trade | Mike Beard | Atlanta Braves | St. Louis Cardinals | Trade |
| May 23, 1977 | Signed | Carlos Lezcano | — | Chicago Cubs | Amateur free agent signing |
| May 22, 1977 | Signed | Dave Huppert | — | Baltimore Orioles | Amateur free agent signing |
| May 22, 1977 | Trade | Stan Bahnsen | Oakland Athletics | Montreal Expos | Trade |
| May 22, 1977 | Trade | Mike Jorgensen | Montreal Expos | Oakland Athletics | Trade |
| May 21, 1977 | Trade | Santo Alcala | Cincinnati Reds | Montreal Expos | Trade |
| May 20, 1977 | Signed | Rod Craig | — | Seattle Mariners | Amateur free agent signing |
| May 20, 1977 | Trade | Rick Auerbach | New York Mets | Texas Rangers | Trade |
| May 19, 1977 | Signed | DeWayne Buice | — | San Francisco Giants | Amateur free agent signing |
| May 17, 1977 | Trade | Butch Metzger | San Diego Padres | St. Louis Cardinals | Trade |
| May 17, 1977 | Trade | John D'Acquisto | St. Louis Cardinals | San Diego Padres | Trade |
| May 17, 1977 | Trade | Pat Scanlon | St. Louis Cardinals | San Diego Padres | Trade |
| May 16, 1977 | Released | Mike Cuellar | California Angels | — | Release |
| May 16, 1977 | Signed | Jay Loviglio | — | Philadelphia Phillies | Amateur free agent signing |
| May 15, 1977 | Signed as free agent | Tom Brown | — | Seattle Mariners | Free agent signing |
| May 11, 1977 | Released | Jerry DaVanon | St. Louis Cardinals | — | Release |
| May 11, 1977 | Trade | Unnamed | California Angels | Cleveland Indians | $250000 |
| May 11, 1977 | Trade | Dave LaRoche | Cleveland Indians | California Angels | Trade |
| May 11, 1977 | Trade | Dave Schuler | Cleveland Indians | California Angels | Trade |
| May 11, 1977 | Trade | Bruce Bochte | California Angels | Cleveland Indians | Trade |
| May 11, 1977 | Trade | Sid Monge | California Angels | Cleveland Indians | Trade |
| May 9, 1977 | Trade | Unnamed | Toronto Blue Jays | Texas Rangers | $200000 |
| May 9, 1977 | Trade | Steve Hargan | Toronto Blue Jays | Texas Rangers | Trade |
| May 9, 1977 | Trade | Jim Mason | Toronto Blue Jays | Texas Rangers | Trade |
| May 9, 1977 | Trade | Roy Howell | Texas Rangers | Toronto Blue Jays | Trade |
| May 7, 1977 | Signed as free agent | Mark Bomback | — | Milwaukee Brewers | Free agent signing |
| May 2, 1977 | Signed | Bert Peña | — | Houston Astros | Amateur free agent signing |
| May 2, 1977 | Released | Ellie Rodriguez | Los Angeles Dodgers | — | Release |
| May 2, 1977 | Released | Ray Sadecki | New York Mets | — | Release |
| May 1977 | Signed as free agent | Carl Morton | — | Philadelphia Phillies | Free agent signing (date approximate, per the source) |
| Apr 27, 1977 | Signed as free agent | Joe Hoerner | — | Cincinnati Reds | Free agent signing |
| Apr 27, 1977 | Trade | Tim Foli | Montreal Expos | San Francisco Giants | Trade |
| Apr 27, 1977 | Trade | Chris Speier | San Francisco Giants | Montreal Expos | Trade |
| Apr 27, 1977 | Trade | Mike Torrez | Oakland Athletics | New York Yankees | Trade |
| Apr 27, 1977 | Trade | Dock Ellis | New York Yankees | Oakland Athletics | Trade |
| Apr 27, 1977 | Trade | Marty Perez | New York Yankees | Oakland Athletics | Trade |
| Apr 27, 1977 | Trade | Larry Murray | New York Yankees | Oakland Athletics | Trade |
| Apr 26, 1977 | Trade | Unnamed | New York Mets | Texas Rangers | $ |
| Apr 26, 1977 | Trade | Lenny Randle | Texas Rangers | New York Mets | Trade |
| Apr 20, 1977 | Trade | Pete Broberg | Seattle Mariners | Chicago Cubs | Trade |
| Apr 14, 1977 | Signed | Paul Hodgson | — | Toronto Blue Jays | Amateur free agent signing |
| Apr 12, 1977 | Signed as free agent | Terry Crowley | — | Baltimore Orioles | Free agent signing |
| Apr 12, 1977 | Signed as free agent | Mark Wiley | — | San Diego Padres | Free agent signing |
| Apr 12, 1977 | Trade | Steve Foucault | Texas Rangers | Detroit Tigers | Trade |
| Apr 12, 1977 | Trade | Willie Horton | Detroit Tigers | Texas Rangers | Trade |
| Apr 10, 1977 | Signed as free agent | Tom Walker | — | Montreal Expos | Free agent signing |
| Apr 9, 1977 | Released | Jim Obradovich | Minnesota Twins | — | Release |
| Apr 9, 1977 | Signed as free agent | Jim Obradovich | — | Houston Astros | Free agent signing |
| Apr 8, 1977 | Signed as free agent | Kurt Bevacqua | — | Texas Rangers | Free agent signing |
| Apr 8, 1977 | Signed as free agent | Tim Stoddard | — | Baltimore Orioles | Free agent signing |
| Apr 7, 1977 | Released | Mark Bomback | Boston Red Sox | — | Release |
| Apr 7, 1977 | Signed as free agent | Jim Bouton | — | Chicago White Sox | Free agent signing |
| Apr 6, 1977 | Released | Reggie Walton | San Francisco Giants | — | Release |
| Apr 5, 1977 | Released | Darryl Cias | Boston Red Sox | — | Release |
| Apr 5, 1977 | Signed as free agent | Roric Harrison | — | Detroit Tigers | Free agent signing |
| Apr 5, 1977 | Released | Keith MacWhorter | Los Angeles Dodgers | — | Release |
| Apr 5, 1977 | Signed as free agent | Boog Powell | — | Los Angeles Dodgers | Free agent signing |
| Apr 5, 1977 | Trade | Unnamed | New York Yankees | Chicago White Sox | $200000 |
| Apr 5, 1977 | Trade | Oscar Gamble | New York Yankees | Chicago White Sox | Trade |
| Apr 5, 1977 | Trade | LaMarr Hoyt | New York Yankees | Chicago White Sox | Trade |
| Apr 5, 1977 | Trade | Bob Polinsky | New York Yankees | Chicago White Sox | Trade |
| Apr 5, 1977 | Trade | Bucky Dent | Chicago White Sox | New York Yankees | Trade |
| Apr 4, 1977 | Signed as free agent | Bruce Dal Canton | — | Chicago White Sox | Free agent signing |
| Apr 4, 1977 | Trade | Mike Easler | California Angels | Pittsburgh Pirates | Trade |
| Apr 4, 1977 | Trade | Randy Sealy | Pittsburgh Pirates | California Angels | Trade |
| Apr 3, 1977 | Signed as free agent | Earl Williams | — | Oakland Athletics | Free agent signing |
| Apr 1, 1977 | Released | Steve Kline | Atlanta Braves | — | Release |
| Apr 1, 1977 | Released | Carl Morton | Texas Rangers | — | Release |
| Apr 1, 1977 | Released | Willie Royster | Pittsburgh Pirates | — | Release |
| Apr 1, 1977 | Signed as free agent | Gary Sutherland | — | San Diego Padres | Free agent signing |
| Mar 31, 1977 | Released | Ken Reynolds | Toronto Blue Jays | — | Release |
| Mar 31, 1977 | Released | Bob Robertson | Pittsburgh Pirates | — | Release |
| Mar 31, 1977 | Signed as free agent | Ray Sadecki | — | New York Mets | Free agent signing |
| Mar 30, 1977 | Released | Bruce Dal Canton | Atlanta Braves | — | Release |
| Mar 30, 1977 | Released | Dave Duncan | Chicago White Sox | — | Release |
| Mar 30, 1977 | Released | Bill Greif | Montreal Expos | — | Release |
| Mar 30, 1977 | Released | Boog Powell | Cleveland Indians | — | Release |
| Mar 30, 1977 | Released | Mark Wiley | Minnesota Twins | — | Release |
| Mar 30, 1977 | Trade | Benny Ayala | New York Mets | St. Louis Cardinals | Trade |
| Mar 30, 1977 | Trade | Doug Clarey | St. Louis Cardinals | New York Mets | Trade |
| Mar 30, 1977 | Trade | Roy Thomas | Seattle Mariners | Houston Astros | Trade |
| Mar 30, 1977 | Trade | Larry Milbourne | Houston Astros | Seattle Mariners | Trade |
| Mar 29, 1977 | Released | Lloyd Allen | Toronto Blue Jays | — | Release |
| Mar 29, 1977 | Released | Dick Bosman | Oakland Athletics | — | Release |
| Mar 29, 1977 | Released | Alan Foster | San Diego Padres | — | Release |
| Mar 29, 1977 | Released | Wayne Granger | Atlanta Braves | — | Release |
| Mar 29, 1977 | Released | Roric Harrison | St. Louis Cardinals | — | Release |
| Mar 29, 1977 | Released | Leon Hooten | Toronto Blue Jays | — | Release |
| Mar 29, 1977 | Released | Doug Howard | Toronto Blue Jays | — | Release |
| Mar 29, 1977 | Trade | Mike Caldwell | St. Louis Cardinals | Cincinnati Reds | Trade |
| Mar 29, 1977 | Trade | Pat Darcy | Cincinnati Reds | St. Louis Cardinals | Trade |
| Mar 29, 1977 | Trade | John Lowenstein | Toronto Blue Jays | Cleveland Indians | Trade |
| Mar 29, 1977 | Trade | Hector Torres | Cleveland Indians | Toronto Blue Jays | Trade |
| Mar 28, 1977 | Released | Ed Crosby | Oakland Athletics | — | Release |
| Mar 28, 1977 | Signed as free agent | Bob Johnson | — | Atlanta Braves | Free agent signing |
| Mar 28, 1977 | Released | Marv Lane | Detroit Tigers | — | Release |
| Mar 28, 1977 | Released | Tim Stoddard | Chicago White Sox | — | Release |
| Mar 28, 1977 | Released | Earl Williams | Montreal Expos | — | Release |
| Mar 28, 1977 | Released | Jim York | Chicago White Sox | — | Release |
| Mar 28, 1977 | Trade | Stan Perzanowski | Cleveland Indians | California Angels | Trade |
| Mar 28, 1977 | Trade | Bill Caudill | St. Louis Cardinals | Cincinnati Reds | Trade |
| Mar 28, 1977 | Trade | Joel Youngblood | Cincinnati Reds | St. Louis Cardinals | Trade |
| Mar 26, 1977 | Released | Kurt Bevacqua | Seattle Mariners | — | Release |
| Mar 26, 1977 | Signed | Chris Bourjos | — | San Francisco Giants | Amateur free agent signing |
| Mar 26, 1977 | Released | Terry Crowley | Baltimore Orioles | — | Release |
| Mar 26, 1977 | Released | Jim Minshall | Seattle Mariners | — | Release |
| Mar 26, 1977 | Released | Rico Petrocelli | Boston Red Sox | — | Release |
| Mar 26, 1977 | Trade | Kerry Dineen | New York Yankees | Philadelphia Phillies | Trade |
| Mar 26, 1977 | Trade | Sergio Ferrer | Philadelphia Phillies | New York Yankees | Trade |
| Mar 26, 1977 | Trade | Unnamed | Texas Rangers | Oakland Athletics | $ |
| Mar 26, 1977 | Trade | Jim Umbarger | Texas Rangers | Oakland Athletics | Trade |
| Mar 26, 1977 | Trade | Rodney Scott | Texas Rangers | Oakland Athletics | Trade |
| Mar 26, 1977 | Trade | Claudell Washington | Oakland Athletics | Texas Rangers | Trade |
| Mar 26, 1977 | Trade | Unnamed | Houston Astros | San Francisco Giants | $ |
| Mar 26, 1977 | Trade | Rob Andrews | Houston Astros | San Francisco Giants | Trade |
| Mar 26, 1977 | Trade | Willie Crawford | San Francisco Giants | Houston Astros | Trade |
| Mar 26, 1977 | Trade | Rob Sperring | San Francisco Giants | Houston Astros | Trade |
| Mar 24, 1977 | Released | Tom Walker | St. Louis Cardinals | — | Release |
| Mar 24, 1977 | Released | Greg Wells | Cleveland Indians | — | Release |
| Mar 23, 1977 | Trade | Clay Carroll | Chicago White Sox | St. Louis Cardinals | Trade |
| Mar 23, 1977 | Trade | Lerrin LaGrow | St. Louis Cardinals | Chicago White Sox | Trade |
| Mar 22, 1977 | Signed as free agent | Joe Lahoud | — | Kansas City Royals | Free agent signing |
| Mar 20, 1977 | Signed as free agent | Joe Decker | — | Chicago Cubs | Free agent signing |
| Mar 18, 1977 | Signed as free agent | Geoff Zahn | — | Minnesota Twins | Free agent signing |
| Mar 17, 1977 | Signed | Rick Engle | — | Montreal Expos | Amateur free agent signing |
| Mar 16, 1977 | Signed as free agent | Dick Allen | — | Oakland Athletics | Free agent signing |
| Mar 15, 1977 | Trade | Bob McClure | Kansas City Royals | Milwaukee Brewers | Trade |
| Mar 15, 1977 | Trade | Jeff Terpko | Texas Rangers | Montreal Expos | Trade |
| Mar 15, 1977 | Trade | Rodney Scott | Montreal Expos | Texas Rangers | Trade |
| Mar 15, 1977 | Trade | Jim Todd | Oakland Athletics | Chicago Cubs | Trade |
| Mar 15, 1977 | Trade | Joe Coleman | Chicago Cubs | Oakland Athletics | Trade |
| Mar 15, 1977 | Trade | Gaylen Pitts | Oakland Athletics | Chicago Cubs | Trade |
| Mar 15, 1977 | Trade | Jim Tyrone | Chicago Cubs | Oakland Athletics | Trade |
| Mar 15, 1977 | Trade | Phil Garner | Oakland Athletics | Pittsburgh Pirates | Trade |
| Mar 15, 1977 | Trade | Tommy Helms | Oakland Athletics | Pittsburgh Pirates | Trade |
| Mar 15, 1977 | Trade | Chris Batton | Oakland Athletics | Pittsburgh Pirates | Trade |
| Mar 15, 1977 | Trade | Dave Giusti | Pittsburgh Pirates | Oakland Athletics | Trade |
| Mar 15, 1977 | Trade | Doc Medich | Pittsburgh Pirates | Oakland Athletics | Trade |
| Mar 15, 1977 | Trade | Doug Bair | Pittsburgh Pirates | Oakland Athletics | Trade |
| Mar 15, 1977 | Trade | Rick Langford | Pittsburgh Pirates | Oakland Athletics | Trade |
| Mar 15, 1977 | Trade | Tony Armas | Pittsburgh Pirates | Oakland Athletics | Trade |
| Mar 15, 1977 | Trade | Mitchell Page | Pittsburgh Pirates | Oakland Athletics | Trade |
| Mar 14, 1977 | Trade | Terry Whitfield | New York Yankees | San Francisco Giants | Trade |
| Mar 14, 1977 | Trade | Marty Perez | San Francisco Giants | New York Yankees | Trade |
| Mar 7, 1977 | Released | Joe Lahoud | Texas Rangers | — | Release |
| Mar 2, 1977 | Signed as free agent | Ed Farmer | — | Baltimore Orioles | Free agent signing |
| Feb 28, 1977 | Trade | Mark Covert | St. Louis Cardinals | Chicago Cubs | Trade |
| Feb 28, 1977 | Trade | Buddy Schultz | Chicago Cubs | St. Louis Cardinals | Trade |
| Feb 27, 1977 | Signed as free agent | Jim Nettles | — | Pittsburgh Pirates | Free agent signing |
| Feb 24, 1977 | Signed as free agent | Wayne Granger | — | Atlanta Braves | Free agent signing |
| Feb 24, 1977 | Trade | Unnamed | Toronto Blue Jays | Oakland Athletics | $ |
| Feb 24, 1977 | Trade | Mike Weathers | Toronto Blue Jays | Oakland Athletics | Trade |
| Feb 24, 1977 | Trade | Ron Fairly | Oakland Athletics | Toronto Blue Jays | Trade |
| Feb 23, 1977 | Signed as free agent | Tito Fuentes | — | Detroit Tigers | Free agent signing |
| Feb 18, 1977 | Released | Chris Arnold | San Francisco Giants | — | Release |
| Feb 18, 1977 | Signed | Jose Uribe | — | New York Yankees | Amateur free agent signing |
| Feb 17, 1977 | Released | Gary Sutherland | Milwaukee Brewers | — | Release |
| Feb 17, 1977 | Trade | Unnamed | Texas Rangers | New York Yankees | $ |
| Feb 17, 1977 | Trade | Greg Pryor | Texas Rangers | New York Yankees | Trade |
| Feb 17, 1977 | Trade | Brian Doyle | Texas Rangers | New York Yankees | Trade |
| Feb 17, 1977 | Trade | Sandy Alomar | New York Yankees | Texas Rangers | Trade |
| Feb 16, 1977 | Trade | Champ Summers | Chicago Cubs | Cincinnati Reds | Trade |
| Feb 16, 1977 | Trade | Dave Schneck | Cincinnati Reds | Chicago Cubs | Trade |
| Feb 16, 1977 | Trade | Dave Roberts | Toronto Blue Jays | San Diego Padres | Trade |
| Feb 16, 1977 | Trade | Jerry Johnson | San Diego Padres | Toronto Blue Jays | Trade |
| Feb 15, 1977 | Signed as free agent | Fritz Peterson | — | Chicago White Sox | Free agent signing |
| Feb 15, 1977 | Trade | Gene Clines | Texas Rangers | Chicago Cubs | Trade |
| Feb 14, 1977 | Signed as free agent | Greg Wells | — | Cleveland Indians | Free agent signing |
| Feb 13, 1977 | Signed | Steve Christmas | — | Cincinnati Reds | Amateur free agent signing |
| Feb 11, 1977 | Signed | Vic Rodriguez | — | Baltimore Orioles | Amateur free agent signing |
| Feb 11, 1977 | Trade | Bobby Murcer | San Francisco Giants | Chicago Cubs | Trade |
| Feb 11, 1977 | Trade | Steve Ontiveros | San Francisco Giants | Chicago Cubs | Trade |
| Feb 11, 1977 | Trade | Andrew Muhlstock | San Francisco Giants | Chicago Cubs | Trade |
| Feb 11, 1977 | Trade | Bill Madlock | Chicago Cubs | San Francisco Giants | Trade |
| Feb 11, 1977 | Trade | Rob Sperring | Chicago Cubs | San Francisco Giants | Trade |
| Feb 10, 1977 | Signed as free agent | Paul Dade | — | Cleveland Indians | Free agent signing |
| Feb 10, 1977 | Signed | Les Straker | — | Cincinnati Reds | Amateur free agent signing |
| Feb 9, 1977 | Released | Wayne Granger | Montreal Expos | — | Release |
| Feb 8, 1977 | Signed as free agent | Billy Smith | — | Baltimore Orioles | Free agent signing |
| Feb 7, 1977 | Trade | Hank Webb | New York Mets | Los Angeles Dodgers | Trade |
| Feb 7, 1977 | Trade | Richard Sander | New York Mets | Los Angeles Dodgers | Trade |
| Feb 7, 1977 | Trade | Rick Auerbach | Los Angeles Dodgers | New York Mets | Trade |
| Feb 5, 1977 | Trade | Unnamed | Texas Rangers | Chicago Cubs | $ |
| Feb 5, 1977 | Trade | Darold Knowles | Chicago Cubs | Texas Rangers | Trade |
| Feb 3, 1977 | Signed as free agent | Davey Johnson | — | Philadelphia Phillies | Free agent signing |
| Feb 2, 1977 | Released | Fritz Peterson | Texas Rangers | — | Release |
| Jan 31, 1977 | Signed as free agent | Ed Crosby | — | Oakland Athletics | Free agent signing |
| Jan 26, 1977 | Released | Blue Moon Odom | Chicago White Sox | — | Release |
| Jan 25, 1977 | Signed as free agent | Mike Cuellar | — | California Angels | Free agent signing |
| Jan 25, 1977 | Trade | Mike Allen | San Diego Padres | Houston Astros | Trade |
| Jan 25, 1977 | Trade | Paul Siebert | Houston Astros | San Diego Padres | Trade |
| Jan 24, 1977 | Signed | Ray Smith | — | Minnesota Twins | Amateur free agent signing |
| Jan 22, 1977 | Released | Willie Davis | San Diego Padres | — | Release |
| Jan 20, 1977 | Trade | Elliott Maddox | New York Yankees | Baltimore Orioles | Trade |
| Jan 20, 1977 | Trade | Rick Bladt | New York Yankees | Baltimore Orioles | Trade |
| Jan 20, 1977 | Trade | Paul Blair | Baltimore Orioles | New York Yankees | Trade |
| Jan 18, 1977 | Signed | Junior Ortiz | — | Pittsburgh Pirates | Amateur free agent signing |
| Jan 17, 1977 | Released | Tommy Davis | Kansas City Royals | — | Release |
| Jan 17, 1977 | Signed | Eddie Vargas | — | Pittsburgh Pirates | Amateur free agent signing |
| Jan 17, 1977 | Released | Geoff Zahn | Chicago Cubs | — | Release |
| Jan 12, 1977 | Trade | Unnamed | Seattle Mariners | Houston Astros | $ |
| Jan 12, 1977 | Trade | Alan Griffin | Seattle Mariners | Houston Astros | Trade |
| Jan 12, 1977 | Trade | Skip Jutze | Houston Astros | Seattle Mariners | Trade |
| Jan 11, 1977 | Trade | Bill Buckner | Los Angeles Dodgers | Chicago Cubs | Trade |
| Jan 11, 1977 | Trade | Ivan de Jesus | Los Angeles Dodgers | Chicago Cubs | Trade |
| Jan 11, 1977 | Trade | Jeff Albert | Los Angeles Dodgers | Chicago Cubs | Trade |
| Jan 11, 1977 | Trade | Rick Monday | Chicago Cubs | Los Angeles Dodgers | Trade |
| Jan 11, 1977 | Trade | Mike Garman | Chicago Cubs | Los Angeles Dodgers | Trade |
| Jan 9, 1977 | Signed as free agent | Craig Minetto | — | Oakland Athletics | Free agent signing |
| Jan 8, 1977 | Signed as free agent | Byron McLaughlin | — | Seattle Mariners | Free agent signing |
| Jan 6, 1977 | Signed as free agent | Willie McCovey | — | San Francisco Giants | Free agent signing |
| Jan 5, 1977 | Trade | Larry Anderson | Toronto Blue Jays | Chicago White Sox | Trade |
| Jan 4, 1977 | Signed as free agent | Ken Sanders | — | Milwaukee Brewers | Free agent signing |
| Jan 4, 1977 | Trade | Quency Hill | Philadelphia Phillies | Los Angeles Dodgers | Trade |
| Jan 4, 1977 | Trade | Dave Machemer | Boston Red Sox | California Angels | Trade |
| Jan 4, 1977 | Trade | John Doherty | California Angels | Boston Red Sox | Trade |
| Jan 3, 1977 | Signed as free agent | Pedro Garcia | — | Toronto Blue Jays | Free agent signing |
| Jan 3, 1977 | Released | Lindy McDaniel | Kansas City Royals | — | Release |
| before the 1977 season | Signed as free agent | Lloyd Allen | — | Toronto Blue Jays | Free agent signing |
| before the 1977 season | Released | Joe Hoerner | Texas Rangers | — | Release |
| before the 1977 season | Released | Jim Shellenback | San Diego Padres | — | 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.