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The 1978 season’s official transaction log: 435 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 21, 1978 | Signed | Mario Diaz | — | Seattle Mariners | Amateur free agent signing |
| Dec 15, 1978 | Trade | Unnamed | Milwaukee Brewers | Texas Rangers | $ |
| Dec 15, 1978 | Trade | Reggie Cleveland | Texas Rangers | Milwaukee Brewers | Trade |
| Dec 15, 1978 | Trade | Ed Farmer | Milwaukee Brewers | Texas Rangers | Trade |
| Dec 15, 1978 | Trade | Gary Holle | Milwaukee Brewers | Texas Rangers | Trade |
| Dec 14, 1978 | Trade | Sam Mejias | Montreal Expos | Chicago Cubs | Trade |
| Dec 14, 1978 | Trade | Rodney Scott | Chicago Cubs | Montreal Expos | Trade |
| Dec 14, 1978 | Trade | Jerry White | Chicago Cubs | Montreal Expos | Trade |
| Dec 13, 1978 | Released | Mickey Stanley | Detroit Tigers | — | Release |
| Dec 13, 1978 | Trade | Mike Bacsik | Texas Rangers | Minnesota Twins | Trade |
| Dec 13, 1978 | Trade | Mac Scarce | Minnesota Twins | Texas Rangers | Trade |
| Dec 12, 1978 | Released | Mark Souza | Minnesota Twins | — | Release |
| Dec 9, 1978 | Signed | Carmelo Martinez | — | Chicago Cubs | Amateur free agent signing |
| Dec 9, 1978 | Signed | Randy St. Claire | — | Montreal Expos | Amateur free agent signing |
| Dec 8, 1978 | Trade | Greg Field | Minnesota Twins | New York Mets | Trade |
| Dec 8, 1978 | Trade | Jerry Koosman | New York Mets | Minnesota Twins | Trade |
| Dec 8, 1978 | Trade | Craig Reynolds | Seattle Mariners | Houston Astros | Trade |
| Dec 8, 1978 | Trade | Floyd Bannister | Houston Astros | Seattle Mariners | Trade |
| Dec 8, 1978 | Trade | Jim Mason | Texas Rangers | Montreal Expos | Trade |
| Dec 8, 1978 | Trade | Mike Hart | Montreal Expos | Texas Rangers | Trade |
| Dec 8, 1978 | Trade | Toby Harrah | Texas Rangers | Cleveland Indians | Trade |
| Dec 8, 1978 | Trade | Buddy Bell | Cleveland Indians | Texas Rangers | Trade |
| Dec 7, 1978 | Trade | Bill Lee | Boston Red Sox | Montreal Expos | Trade |
| Dec 7, 1978 | Trade | Stan Papi | Montreal Expos | Boston Red Sox | Trade |
| Dec 6, 1978 | Trade | Joe Charboneau | Philadelphia Phillies | Cleveland Indians | Trade |
| Dec 6, 1978 | Trade | Cardell Camper | Cleveland Indians | Philadelphia Phillies | Trade |
| Dec 5, 1978 | Signed as free agent | Darrell Evans | — | San Francisco Giants | Free agent signing |
| Dec 5, 1978 | Signed as free agent | Pete Rose | — | Philadelphia Phillies | Free agent signing |
| Dec 5, 1978 | Trade | Tom Grieve | New York Mets | St. Louis Cardinals | Trade |
| Dec 5, 1978 | Trade | Kim Seaman | New York Mets | St. Louis Cardinals | Trade |
| Dec 5, 1978 | Trade | Pete Falcone | St. Louis Cardinals | New York Mets | Trade |
| Dec 5, 1978 | Trade | Enrique Romo | Seattle Mariners | Pittsburgh Pirates | Trade |
| Dec 5, 1978 | Trade | Rick Jones | Seattle Mariners | Pittsburgh Pirates | Trade |
| Dec 5, 1978 | Trade | Tom McMillan | Seattle Mariners | Pittsburgh Pirates | Trade |
| Dec 5, 1978 | Trade | Odell Jones | Pittsburgh Pirates | Seattle Mariners | Trade |
| Dec 5, 1978 | Trade | Rafael Vasquez | Pittsburgh Pirates | Seattle Mariners | Trade |
| Dec 5, 1978 | Trade | Mario Mendoza | Pittsburgh Pirates | Seattle Mariners | Trade |
| Dec 5, 1978 | Trade | Victor Cruz | Toronto Blue Jays | Cleveland Indians | Trade |
| Dec 5, 1978 | Trade | Alfredo Griffin | Cleveland Indians | Toronto Blue Jays | Trade |
| Dec 5, 1978 | Trade | Phil Lansford | Cleveland Indians | Toronto Blue Jays | Trade |
| Dec 4, 1978 | Released | Chuck Scrivener | Detroit Tigers | — | Release |
| Dec 4, 1978 | Trade | Gary Woods | Toronto Blue Jays | Houston Astros | Trade |
| Dec 4, 1978 | Trade | Don Pisker | Houston Astros | Toronto Blue Jays | Trade |
| Dec 4, 1978 | Trade | Bob Sykes | Detroit Tigers | St. Louis Cardinals | Trade |
| Dec 4, 1978 | Trade | John Murphy | Detroit Tigers | St. Louis Cardinals | Trade |
| Dec 4, 1978 | Trade | Jerry Morales | St. Louis Cardinals | Detroit Tigers | Trade |
| Dec 4, 1978 | Trade | Aurelio Lopez | St. Louis Cardinals | Detroit Tigers | Trade |
| Dec 4, 1978 | Trade | Dan Ford | Minnesota Twins | California Angels | Trade |
| Dec 4, 1978 | Trade | Ron Jackson | California Angels | Minnesota Twins | Trade |
| Dec 4, 1978 | Trade | Danny Goodwin | California Angels | Minnesota Twins | Trade |
| Dec 3, 1978 | Signed as free agent | Jim Barr | — | California Angels | Free agent signing |
| Dec 3, 1978 | Signed | Willie Lozado | — | Milwaukee Brewers | Amateur free agent signing |
| Dec 2, 1978 | Released | Bill Singer | Toronto Blue Jays | — | Release |
| Nov 29, 1978 | Signed as free agent | Steve Stone | — | Baltimore Orioles | Free agent signing |
| Nov 28, 1978 | Signed as free agent | Duffy Dyer | — | Montreal Expos | Free agent signing |
| Nov 28, 1978 | Signed as free agent | Jim Slaton | — | Milwaukee Brewers | Free agent signing |
| Nov 27, 1978 | Signed | Jose Escobar | — | Toronto Blue Jays | Amateur free agent signing |
| Nov 27, 1978 | Trade | Alan Ashby | Toronto Blue Jays | Houston Astros | Trade |
| Nov 27, 1978 | Trade | Joe Cannon | Houston Astros | Toronto Blue Jays | Trade |
| Nov 27, 1978 | Trade | Pete Hernandez | Houston Astros | Toronto Blue Jays | Trade |
| Nov 27, 1978 | Trade | Mark Lemongello | Houston Astros | Toronto Blue Jays | Trade |
| Nov 24, 1978 | Signed | Toby Hernandez | — | Toronto Blue Jays | Amateur free agent signing |
| Nov 24, 1978 | Signed | Fred Manrique | — | Toronto Blue Jays | Amateur free agent signing |
| Nov 23, 1978 | Signed | Manny Hernandez | — | Houston Astros | Amateur free agent signing |
| Nov 21, 1978 | Signed as free agent | Tommy John | — | New York Yankees | Free agent signing |
| Nov 14, 1978 | Signed as free agent | Derrel Thomas | — | Los Angeles Dodgers | Free agent signing |
| Nov 13, 1978 | Signed as free agent | Larry Gura | — | Kansas City Royals | Free agent signing |
| Nov 13, 1978 | Signed as free agent | Luis Tiant | — | New York Yankees | Free agent signing |
| Nov 10, 1978 | Trade | Unnamed | New York Yankees | Texas Rangers | $ |
| Nov 10, 1978 | Trade | Dave Righetti | Texas Rangers | New York Yankees | Trade |
| Nov 10, 1978 | Trade | Juan Beniquez | Texas Rangers | New York Yankees | Trade |
| Nov 10, 1978 | Trade | Mike Griffin | Texas Rangers | New York Yankees | Trade |
| Nov 10, 1978 | Trade | Paul Mirabella | Texas Rangers | New York Yankees | Trade |
| Nov 10, 1978 | Trade | Greg Jemison | Texas Rangers | New York Yankees | Trade |
| Nov 10, 1978 | Trade | Domingo Ramos | New York Yankees | Texas Rangers | Trade |
| Nov 10, 1978 | Trade | Mike Heath | New York Yankees | Texas Rangers | Trade |
| Nov 10, 1978 | Trade | Sparky Lyle | New York Yankees | Texas Rangers | Trade |
| Nov 10, 1978 | Trade | Larry McCall | New York Yankees | Texas Rangers | Trade |
| Nov 10, 1978 | Trade | Dave Rajsich | New York Yankees | Texas Rangers | Trade |
| Nov 6, 1978 | Released | Dave May | Pittsburgh Pirates | — | Release |
| Nov 6, 1978 | Released | Andy Messersmith | New York Yankees | — | Release |
| Nov 3, 1978 | Trade | Dave Freisleben | Cleveland Indians | Toronto Blue Jays | Trade |
| Nov 2, 1978 | Released | Tom Griffin | California Angels | — | Release |
| Nov 2, 1978 | Released | Larry Haney | Milwaukee Brewers | — | Release |
| Oct 30, 1978 | Signed | Alvaro Espinoza | — | Houston Astros | Amateur free agent signing |
| Oct 27, 1978 | Released | Steve Luebber | Chicago White Sox | — | Release |
| Oct 27, 1978 | Trade | Mike Potter | St. Louis Cardinals | Seattle Mariners | Trade |
| Oct 26, 1978 | Released | Rudy Meoli | Chicago Cubs | — | Release |
| Oct 25, 1978 | Trade | Unnamed | San Diego Padres | Texas Rangers | $300000 |
| Oct 25, 1978 | Trade | Mike Hargrove | Texas Rangers | San Diego Padres | Trade |
| Oct 25, 1978 | Trade | Kurt Bevacqua | Texas Rangers | San Diego Padres | Trade |
| Oct 25, 1978 | Trade | Bill Fahey | Texas Rangers | San Diego Padres | Trade |
| Oct 25, 1978 | Trade | Oscar Gamble | San Diego Padres | Texas Rangers | Trade |
| Oct 25, 1978 | Trade | Dave Roberts | San Diego Padres | Texas Rangers | Trade |
| Oct 24, 1978 | Released | Sandy Alomar | Texas Rangers | — | Release |
| Oct 23, 1978 | Released | Will McEnaney | Pittsburgh Pirates | — | Release |
| Oct 23, 1978 | Trade | Jim Willoughby | Chicago White Sox | St. Louis Cardinals | Trade |
| Oct 23, 1978 | Trade | John Scott | St. Louis Cardinals | Chicago White Sox | Trade |
| Oct 20, 1978 | Released | Mike Anderson | Baltimore Orioles | — | Release |
| Oct 17, 1978 | Released | Clay Carroll | Pittsburgh Pirates | — | Release |
| Oct 17, 1978 | Released | Davey Johnson | Chicago Cubs | — | Release |
| Oct 17, 1978 | Released | Cookie Rojas | Chicago Cubs | — | Release |
| Oct 3, 1978 | Released | Dave Johnson | Minnesota Twins | — | Release |
| Oct 3, 1978 | Trade | Bobby Cuellar | Texas Rangers | Cleveland Indians | Trade |
| Oct 3, 1978 | Trade | Dave Rivera | Texas Rangers | Cleveland Indians | Trade |
| Oct 3, 1978 | Trade | Bobby Bonds | Texas Rangers | Cleveland Indians | Trade |
| Oct 3, 1978 | Trade | Len Barker | Texas Rangers | Cleveland Indians | Trade |
| Oct 3, 1978 | Trade | Jim Kern | Cleveland Indians | Texas Rangers | Trade |
| Oct 3, 1978 | Trade | Larvell Blanks | Cleveland Indians | Texas Rangers | Trade |
| Oct 2, 1978 | Released | Ed Herrmann | Montreal Expos | — | Release |
| Oct 2, 1978 | Trade | Paul Siebert | New York Mets | St. Louis Cardinals | Trade |
| Oct 2, 1978 | Trade | Bob Coluccio | St. Louis Cardinals | New York Mets | Trade |
| Sep 29, 1978 | Trade | Gary Lance | Kansas City Royals | Seattle Mariners | Trade |
| Sep 25, 1978 | Signed as free agent | Gene Pentz | — | Pittsburgh Pirates | Free agent signing |
| Sep 25, 1978 | Released | Charlie Spikes | Detroit Tigers | — | Release |
| Sep 24, 1978 | Signed | David Green | — | Milwaukee Brewers | Amateur free agent signing |
| Sep 21, 1978 | Released | Juan Agosto | Boston Red Sox | — | Release |
| Sep 12, 1978 | Trade | Andrew Dyes | Toronto Blue Jays | San Diego Padres | Trade |
| Sep 12, 1978 | Trade | Mark Wiley | San Diego Padres | Toronto Blue Jays | Trade |
| Sep 11, 1978 | Trade | Jeffrey Leonard | Los Angeles Dodgers | Houston Astros | Trade |
| Sep 10, 1978 | Signed | Alejandro Peña | — | Los Angeles Dodgers | Amateur free agent signing |
| Sep 5, 1978 | Released | Steve Foucault | Kansas City Royals | — | Release |
| Sep 5, 1978 | Released | Gene Pentz | Houston Astros | — | Release |
| Sep 4, 1978 | Signed as free agent | Ron Kittle | — | Chicago White Sox | Free agent signing |
| Sep 3, 1978 | Signed | Marvell Wynne | — | Kansas City Royals | Amateur free agent signing |
| Sep 2, 1978 | Trade | Dan Warthen | Philadelphia Phillies | Houston Astros | Trade |
| Sep 2, 1978 | Trade | Dan Larson | Houston Astros | Philadelphia Phillies | Trade |
| Sep 1, 1978 | Signed as free agent | Matt Alexander | — | Pittsburgh Pirates | Free agent signing |
| Sep 1, 1978 | Signed as free agent | Larry Haney | — | Milwaukee Brewers | Free agent signing |
| Sep 1, 1978 | Signed as free agent | Cookie Rojas | — | Chicago Cubs | Free agent signing |
| Aug 31, 1978 | Trade | Johnny Grubb | Cleveland Indians | Texas Rangers | Trade |
| Aug 27, 1978 | Signed | Brad Wellman | — | Kansas City Royals | Amateur free agent signing |
| Aug 26, 1978 | Signed | Howard Bailey | — | Detroit Tigers | Amateur free agent signing |
| Aug 25, 1978 | Signed | Don Carman | — | Philadelphia Phillies | Amateur free agent signing |
| Aug 25, 1978 | Released | Enzo Hernandez | Los Angeles Dodgers | — | Release |
| Aug 15, 1978 | Trade | Rico Carty | Toronto Blue Jays | Oakland Athletics | Trade |
| Aug 15, 1978 | Trade | Willie Horton | Oakland Athletics | Toronto Blue Jays | Trade |
| Aug 15, 1978 | Trade | Phil Huffman | Oakland Athletics | Toronto Blue Jays | Trade |
| Aug 6, 1978 | Trade | Larry Anderson | Chicago Cubs | Philadelphia Phillies | Trade |
| Aug 6, 1978 | Trade | Davey Johnson | Philadelphia Phillies | Chicago Cubs | Trade |
| Aug 3, 1978 | Trade | Unnamed | Kansas City Royals | Milwaukee Brewers | $ |
| Aug 3, 1978 | Trade | Jamie Quirk | Milwaukee Brewers | Kansas City Royals | Trade |
| Aug 3, 1978 | Trade | Gerald Ako | Kansas City Royals | Milwaukee Brewers | Trade |
| Jul 29, 1978 | Trade | Pepe Mangual | New York Mets | California Angels | Trade |
| Jul 28, 1978 | Trade | Gil Flores | California Angels | New York Mets | Trade |
| Jul 26, 1978 | Released | Tito Fuentes | Oakland Athletics | — | Release |
| Jul 24, 1978 | Trade | Rob Dressler | San Francisco Giants | St. Louis Cardinals | Trade |
| Jul 21, 1978 | Signed | Al Pedrique | — | New York Mets | Amateur free agent signing |
| Jul 18, 1978 | Signed as free agent | Al Fitzmorris | — | California Angels | Free agent signing |
| Jul 18, 1978 | Trade | John Tamargo | St. Louis Cardinals | San Francisco Giants | Trade |
| Jul 17, 1978 | Signed | Guy Hoffman | — | Chicago White Sox | Amateur free agent signing |
| Jul 13, 1978 | Released | Al Fitzmorris | Cleveland Indians | — | Release |
| Jul 13, 1978 | Signed as free agent | Willie Horton | — | Oakland Athletics | Free agent signing |
| Jul 7, 1978 | Released | Ron Kittle | Los Angeles Dodgers | — | Release |
| Jul 7, 1978 | Trade | Rafael Landestoy | Los Angeles Dodgers | Houston Astros | Trade |
| Jul 3, 1978 | Released | Willie Horton | Cleveland Indians | — | Release |
| Jul 2, 1978 | Signed as free agent | Kim Allen | — | Baltimore Orioles | Free agent signing |
| Jul 1, 1978 | Released | Gibson Alba | Pittsburgh Pirates | — | Release |
| Jul 1, 1978 | Trade | Unnamed | Houston Astros | Los Angeles Dodgers | $ |
| Jul 1, 1978 | Trade | Joe Ferguson | Houston Astros | Los Angeles Dodgers | Trade |
| Jun 30, 1978 | Released | Kim Allen | Pittsburgh Pirates | — | Release |
| Jun 30, 1978 | Signed | Carmelo Castillo | — | Philadelphia Phillies | Amateur free agent signing |
| Jun 28, 1978 | Signed | Tom Filer | — | New York Yankees | Amateur free agent signing |
| Jun 26, 1978 | Trade | Dennis DeBarr | Cleveland Indians | Chicago Cubs | Trade |
| Jun 26, 1978 | Trade | Paul Reuschel | Chicago Cubs | Cleveland Indians | Trade |
| Jun 26, 1978 | Trade | Jose Baez | Seattle Mariners | St. Louis Cardinals | Trade |
| Jun 23, 1978 | Released | Mike Anderson | Philadelphia Phillies | — | Release |
| Jun 23, 1978 | Signed as free agent | Mike Anderson | — | Baltimore Orioles | Free agent signing |
| Jun 23, 1978 | Trade | Jerry White | Montreal Expos | Chicago Cubs | Trade |
| Jun 22, 1978 | Trade | Bill Laxton | Cleveland Indians | San Diego Padres | Trade |
| Jun 22, 1978 | Trade | Dave Freisleben | San Diego Padres | Cleveland Indians | Trade |
| Jun 20, 1978 | Signed as free agent | Tito Fuentes | — | Oakland Athletics | Free agent signing |
| Jun 19, 1978 | Signed | Bill Earley | — | Chicago Cubs | Amateur free agent signing |
| Jun 19, 1978 | Signed as free agent | Marty Perez | — | New York Mets | Free agent signing |
| Jun 16, 1978 | Signed | Dave Sax | — | Los Angeles Dodgers | Amateur free agent signing |
| Jun 15, 1978 | Trade | Jim Dwyer | St. Louis Cardinals | San Francisco Giants | Trade |
| Jun 15, 1978 | Trade | Dick Ruthven | Atlanta Braves | Philadelphia Phillies | Trade |
| Jun 15, 1978 | Trade | Gene Garber | Philadelphia Phillies | Atlanta Braves | Trade |
| Jun 15, 1978 | Trade | Lynn McGlothen | San Francisco Giants | Chicago Cubs | Trade |
| Jun 15, 1978 | Trade | Hector Cruz | Chicago Cubs | San Francisco Giants | Trade |
| Jun 15, 1978 | Trade | Mike Vail | Cleveland Indians | Chicago Cubs | Trade |
| Jun 15, 1978 | Trade | Joe Wallis | Chicago Cubs | Cleveland Indians | Trade |
| Jun 15, 1978 | Trade | Gary Alexander | Oakland Athletics | Cleveland Indians | Trade |
| Jun 15, 1978 | Trade | Joe Wallis | Cleveland Indians | Oakland Athletics | Trade |
| Jun 15, 1978 | Trade | Unnamed | New York Yankees | Oakland Athletics | $50000 |
| Jun 15, 1978 | Trade | Gary Thomasson | Oakland Athletics | New York Yankees | Trade |
| Jun 15, 1978 | Trade | Dell Alston | New York Yankees | Oakland Athletics | Trade |
| Jun 15, 1978 | Trade | Mickey Klutts | New York Yankees | Oakland Athletics | Trade |
| Jun 14, 1978 | Trade | Rawly Eastwick | New York Yankees | Philadelphia Phillies | Trade |
| Jun 14, 1978 | Trade | Jay Johnstone | Philadelphia Phillies | New York Yankees | Trade |
| Jun 14, 1978 | Trade | Bobby Brown | Philadelphia Phillies | New York Yankees | Trade |
| Jun 14, 1978 | Trade | Dennis Kinney | Cleveland Indians | San Diego Padres | Trade |
| Jun 14, 1978 | Trade | Dan Spillner | San Diego Padres | Cleveland Indians | Trade |
| Jun 12, 1978 | Trade | Ron Davis | Chicago Cubs | New York Yankees | Trade |
| Jun 10, 1978 | Released | Alan Wiggins | California Angels | — | Release |
| Jun 10, 1978 | Trade | Ken Holtzman | New York Yankees | Chicago Cubs | Trade |
| Jun 9, 1978 | Signed | Steve Brown | — | California Angels | Amateur free agent signing |
| Jun 9, 1978 | Signed as free agent | Bob Detherage | — | Kansas City Royals | Free agent signing |
| Jun 9, 1978 | Trade | Woodie Fryman | Chicago Cubs | Montreal Expos | Trade |
| Jun 8, 1978 | Trade | Bob Coluccio | Houston Astros | St. Louis Cardinals | Trade |
| Jun 8, 1978 | Trade | Frank Riccelli | St. Louis Cardinals | Houston Astros | Trade |
| Jun 7, 1978 | Signed | Jaime Cocanower | — | Milwaukee Brewers | Amateur free agent signing |
| Jun 6, 1978 | Signed | Candy Maldonado | — | Los Angeles Dodgers | Amateur free agent signing |
| Jun 5, 1978 | Trade | Steve Hamrick | Seattle Mariners | Kansas City Royals | Trade |
| Jun 2, 1978 | Released | Joe Lahoud | Kansas City Royals | — | Release |
| Jun 1, 1978 | Released | Jim Fregosi | Pittsburgh Pirates | — | Release |
| Jun 1, 1978 | Trade | Steve Braun | Seattle Mariners | Kansas City Royals | Trade |
| Jun 1, 1978 | Trade | Jim Colborn | Kansas City Royals | Seattle Mariners | Trade |
| May 31, 1978 | Signed as free agent | Tom Paciorek | — | Seattle Mariners | Free agent signing |
| May 27, 1978 | Signed as free agent | Gerry Pirtle | — | Montreal Expos | Free agent signing |
| May 26, 1978 | Released | Gary Sutherland | St. Louis Cardinals | — | Release |
| May 26, 1978 | Trade | George Hendrick | San Diego Padres | St. Louis Cardinals | Trade |
| May 26, 1978 | Trade | Eric Rasmussen | St. Louis Cardinals | San Diego Padres | Trade |
| May 23, 1978 | Released | Tom Paciorek | Atlanta Braves | — | Release |
| May 20, 1978 | Signed as free agent | Ed Goodson | — | Cleveland Indians | Free agent signing |
| May 20, 1978 | Signed | Bob Ojeda | — | Boston Red Sox | Amateur free agent signing |
| May 20, 1978 | Trade | Larry Landreth | Montreal Expos | Los Angeles Dodgers | Trade |
| May 20, 1978 | Trade | Gerry Hannahs | Montreal Expos | Los Angeles Dodgers | Trade |
| May 20, 1978 | Trade | Mike Garman | Los Angeles Dodgers | Montreal Expos | Trade |
| May 19, 1978 | Trade | Ken Henderson | New York Mets | Cincinnati Reds | Trade |
| May 19, 1978 | Trade | Dale Murray | Cincinnati Reds | New York Mets | Trade |
| May 18, 1978 | Signed as free agent | Larry Lintz | — | Cleveland Indians | Free agent signing |
| May 18, 1978 | Released | Gerry Pirtle | Chicago Cubs | — | Release |
| May 17, 1978 | Signed | Ben Hayes | — | Cincinnati Reds | Amateur free agent signing |
| May 17, 1978 | Released | Marty Perez | Oakland Athletics | — | Release |
| May 17, 1978 | Released | Earl Williams | Oakland Athletics | — | Release |
| May 17, 1978 | Trade | Bill North | Oakland Athletics | Los Angeles Dodgers | Trade |
| May 17, 1978 | Trade | Glenn Burke | Los Angeles Dodgers | Oakland Athletics | Trade |
| May 16, 1978 | Signed as free agent | Jim Bouton | — | Atlanta Braves | Free agent signing |
| May 16, 1978 | Trade | Claudell Washington | Texas Rangers | Chicago White Sox | Trade |
| May 16, 1978 | Trade | Rusty Torres | Texas Rangers | Chicago White Sox | Trade |
| May 16, 1978 | Trade | Bobby Bonds | Chicago White Sox | Texas Rangers | Trade |
| May 15, 1978 | Signed as free agent | Mike Marshall | — | Minnesota Twins | Free agent signing |
| May 13, 1978 | Signed as free agent | Tom Buskey | — | Toronto Blue Jays | Free agent signing |
| May 10, 1978 | Released | Fran Healy | New York Yankees | — | Release |
| May 6, 1978 | Signed | Steve Crawford | — | Boston Red Sox | Amateur free agent signing |
| Apr 28, 1978 | Signed as free agent | Roric Harrison | — | Minnesota Twins | Free agent signing |
| Apr 28, 1978 | Trade | Tim Nordbrook | Toronto Blue Jays | Milwaukee Brewers | Trade |
| Apr 28, 1978 | Trade | Tim Johnson | Milwaukee Brewers | Toronto Blue Jays | Trade |
| Apr 23, 1978 | Signed | Julio Franco | — | Philadelphia Phillies | Amateur free agent signing |
| Apr 19, 1978 | Signed as free agent | Mark DeJohn | — | Detroit Tigers | Free agent signing |
| Apr 14, 1978 | Signed as free agent | Mike Anderson | — | Philadelphia Phillies | Free agent signing |
| Apr 14, 1978 | Released | Pat Dobson | Cleveland Indians | — | Release |
| Apr 13, 1978 | Signed as free agent | Cliff Speck | — | Philadelphia Phillies | Free agent signing |
| Apr 13, 1978 | Released | Reggie Walton | Seattle Mariners | — | Release |
| Apr 11, 1978 | Signed as free agent | Randy Elliott | — | Cleveland Indians | Free agent signing |
| Apr 10, 1978 | Released | Mark DeJohn | Toronto Blue Jays | — | Release |
| Apr 10, 1978 | Signed | Alejandro Sanchez | — | Philadelphia Phillies | Amateur free agent signing |
| Apr 9, 1978 | Signed as free agent | Vic Correll | — | Cincinnati Reds | Free agent signing |
| Apr 9, 1978 | Released | Roric Harrison | Pittsburgh Pirates | — | Release |
| Apr 7, 1978 | Signed | Paul Boris | — | New York Yankees | Amateur free agent signing |
| Apr 7, 1978 | Signed | Steve Hammond | — | Atlanta Braves | Amateur free agent signing |
| Apr 7, 1978 | Signed as free agent | Tom Paciorek | — | Atlanta Braves | Free agent signing |
| Apr 7, 1978 | Trade | Mario Guerrero | San Francisco Giants | Oakland Athletics | Trade |
| Apr 7, 1978 | Trade | Mike Edwards | Pittsburgh Pirates | Oakland Athletics | Trade |
| Apr 6, 1978 | Signed as free agent | Bob Coluccio | — | Houston Astros | Free agent signing |
| Apr 6, 1978 | Released | Terry Harmon | Philadelphia Phillies | — | Release |
| Apr 6, 1978 | Signed as free agent | Ubaldo Heredia | — | Los Angeles Dodgers | Free agent signing |
| Apr 6, 1978 | Signed as free agent | Bill Plummer | — | Seattle Mariners | Free agent signing |
| Apr 5, 1978 | Trade | Joe Gates | Kansas City Royals | Chicago White Sox | Trade |
| Apr 5, 1978 | Trade | Mike Ondina | Chicago White Sox | Kansas City Royals | Trade |
| Apr 4, 1978 | Signed as free agent | Steve Brye | — | Pittsburgh Pirates | Free agent signing |
| Apr 4, 1978 | Signed as free agent | Tony Muser | — | Milwaukee Brewers | Free agent signing |
| Apr 4, 1978 | Trade | Manny Sanguillen | Oakland Athletics | Pittsburgh Pirates | Trade |
| Apr 4, 1978 | Trade | Miguel Dilone | Pittsburgh Pirates | Oakland Athletics | Trade |
| Apr 4, 1978 | Trade | Elias Sosa | Pittsburgh Pirates | Oakland Athletics | Trade |
| Apr 2, 1978 | Signed as free agent | Jim Hughes | — | Texas Rangers | Free agent signing |
| Apr 1, 1978 | Released | Tom Buskey | Texas Rangers | — | Release |
| Apr 1, 1978 | Released | Bob Coluccio | Chicago White Sox | — | Release |
| Apr 1, 1978 | Signed as free agent | Ed Farmer | — | Milwaukee Brewers | Free agent signing |
| Apr 1, 1978 | Signed as free agent | Bob Galasso | — | Milwaukee Brewers | Free agent signing |
| Apr 1, 1978 | Released | Bart Johnson | Chicago White Sox | — | Release |
| Apr 1, 1978 | Released | Dave Nelson | Kansas City Royals | — | Release |
| Apr 1, 1978 | Released | Cliff Speck | New York Mets | — | Release |
| Apr 1, 1978 | Released | Royle Stillman | Chicago White Sox | — | Release |
| Apr 1978 | Signed as free agent | Clay Carroll | — | Pittsburgh Pirates | Free agent signing |
| Apr 1978 | Signed as free agent | Enzo Hernandez | — | Los Angeles Dodgers | Free agent signing (date approximate, per the source) |
| Mar 31, 1978 | Released | Matt Alexander | Oakland Athletics | — | Release |
| Mar 31, 1978 | Released | Rick Sawyer | Montreal Expos | — | Release |
| Mar 31, 1978 | Signed as free agent | Dave Wallace | — | Toronto Blue Jays | Free agent signing |
| Mar 30, 1978 | Released | Steve Brye | Milwaukee Brewers | — | Release |
| Mar 30, 1978 | Released | Buzz Capra | Atlanta Braves | — | Release |
| Mar 30, 1978 | Released | Clay Carroll | Chicago White Sox | — | Release |
| Mar 30, 1978 | Released | Vic Correll | Atlanta Braves | — | Release |
| Mar 30, 1978 | Released | Willie Crawford | Los Angeles Dodgers | — | Release |
| Mar 30, 1978 | Released | Larry Haney | Milwaukee Brewers | — | Release |
| Mar 30, 1978 | Signed as free agent | Roric Harrison | — | Pittsburgh Pirates | Free agent signing |
| Mar 30, 1978 | Released | Von Joshua | Milwaukee Brewers | — | Release |
| Mar 30, 1978 | Released | Larry Lintz | Oakland Athletics | — | Release |
| Mar 30, 1978 | Released | Tom Paciorek | Atlanta Braves | — | Release |
| Mar 30, 1978 | Released | Bill Plummer | Cincinnati Reds | — | Release |
| Mar 30, 1978 | Released | Craig Robinson | Atlanta Braves | — | Release |
| Mar 30, 1978 | Released | Stan Thomas | Chicago White Sox | — | Release |
| Mar 30, 1978 | Trade | Dave Augustine | Pittsburgh Pirates | Houston Astros | Trade |
| Mar 30, 1978 | Trade | Jim Fuller | Houston Astros | Pittsburgh Pirates | Trade |
| Mar 30, 1978 | Trade | Dennis Eckersley | Cleveland Indians | Boston Red Sox | Trade |
| Mar 30, 1978 | Trade | Fred Kendall | Cleveland Indians | Boston Red Sox | Trade |
| Mar 30, 1978 | Trade | Rick Wise | Boston Red Sox | Cleveland Indians | Trade |
| Mar 30, 1978 | Trade | Mike Paxton | Boston Red Sox | Cleveland Indians | Trade |
| Mar 30, 1978 | Trade | Ted Cox | Boston Red Sox | Cleveland Indians | Trade |
| Mar 30, 1978 | Trade | Bo Diaz | Boston Red Sox | Cleveland Indians | Trade |
| Mar 30, 1978 | Trade | Pablo Torrealba | Oakland Athletics | Chicago White Sox | Trade |
| Mar 30, 1978 | Trade | Steve Renko | Chicago White Sox | Oakland Athletics | Trade |
| Mar 30, 1978 | Trade | Jim Essian | Chicago White Sox | Oakland Athletics | Trade |
| Mar 29, 1978 | Released | Joe Henderson | Toronto Blue Jays | — | Release |
| Mar 29, 1978 | Released | Jim Hughes | Chicago White Sox | — | Release |
| Mar 29, 1978 | Trade | Unnamed | Oakland Athletics | Chicago Cubs | $ |
| Mar 29, 1978 | Trade | Rodney Scott | Oakland Athletics | Chicago Cubs | Trade |
| Mar 29, 1978 | Trade | Pete Broberg | Chicago Cubs | Oakland Athletics | Trade |
| Mar 29, 1978 | Trade | Will McEnaney | Montreal Expos | Pittsburgh Pirates | Trade |
| Mar 29, 1978 | Trade | Timothy Jones | Pittsburgh Pirates | Montreal Expos | Trade |
| Mar 29, 1978 | Trade | Jim Burton | Boston Red Sox | New York Mets | Trade |
| Mar 29, 1978 | Trade | Leo Foster | New York Mets | Boston Red Sox | Trade |
| Mar 28, 1978 | Released | Dick Allen | Oakland Athletics | — | Release |
| Mar 28, 1978 | Released | Mike Anderson | St. Louis Cardinals | — | Release |
| Mar 28, 1978 | Released | Larry Dierker | St. Louis Cardinals | — | Release |
| Mar 28, 1978 | Released | Denny Doyle | Boston Red Sox | — | Release |
| Mar 28, 1978 | Released | Ed Farmer | Baltimore Orioles | — | Release |
| Mar 28, 1978 | Signed as free agent | Mark Mercer | — | Texas Rangers | Free agent signing |
| Mar 28, 1978 | Signed as free agent | Vern Ruhle | — | Houston Astros | Free agent signing |
| Mar 28, 1978 | Released | Brent Strom | San Diego Padres | — | Release |
| Mar 28, 1978 | Released | Mark Williams | Oakland Athletics | — | Release |
| Mar 27, 1978 | Released | Randy Elliott | San Francisco Giants | — | Release |
| Mar 27, 1978 | Released | Bob Galasso | Seattle Mariners | — | Release |
| Mar 27, 1978 | Released | Skip Jutze | Seattle Mariners | — | Release |
| Mar 27, 1978 | Released | Mike Kekich | Seattle Mariners | — | Release |
| Mar 27, 1978 | Released | Vern Ruhle | Detroit Tigers | — | Release |
| Mar 27, 1978 | Released | Hector Torres | Toronto Blue Jays | — | Release |
| Mar 27, 1978 | Released | Danny Walton | Houston Astros | — | Release |
| Mar 27, 1978 | Trade | Jackson Todd | New York Mets | Philadelphia Phillies | Trade |
| Mar 27, 1978 | Trade | Ed Cuervo | Philadelphia Phillies | New York Mets | Trade |
| Mar 25, 1978 | Released | Tommy Helms | Boston Red Sox | — | Release |
| Mar 25, 1978 | Signed as free agent | Merv Rettenmund | — | California Angels | Free agent signing |
| Mar 25, 1978 | Trade | Steve Staggs | Toronto Blue Jays | Oakland Athletics | Trade |
| Mar 25, 1978 | Trade | Sheldon Mallory | Oakland Athletics | Toronto Blue Jays | Trade |
| Mar 24, 1978 | Trade | Unnamed | Philadelphia Phillies | New York Mets | $ |
| Mar 24, 1978 | Trade | Bud Harrelson | New York Mets | Philadelphia Phillies | Trade |
| Mar 24, 1978 | Trade | Fred Andrews | Philadelphia Phillies | New York Mets | Trade |
| Mar 24, 1978 | Trade | Frank Duffy | Cleveland Indians | Boston Red Sox | Trade |
| Mar 24, 1978 | Trade | Rick Kreuger | Boston Red Sox | Cleveland Indians | Trade |
| Mar 23, 1978 | Released | Don Carrithers | Minnesota Twins | — | Release |
| Mar 23, 1978 | Released | Rich Folkers | Detroit Tigers | — | Release |
| Mar 23, 1978 | Released | Roric Harrison | Detroit Tigers | — | Release |
| Mar 23, 1978 | Trade | Mike Cosgrove | Toronto Blue Jays | California Angels | Trade |
| Mar 23, 1978 | Trade | Mickey Scott | California Angels | Toronto Blue Jays | Trade |
| Mar 22, 1978 | Released | Tito Fuentes | Montreal Expos | — | Release |
| Mar 22, 1978 | Released | Jerry Johnson | Toronto Blue Jays | — | Release |
| Mar 22, 1978 | Released | Tommy Moore | Baltimore Orioles | — | Release |
| Mar 21, 1978 | Signed | Alan Hargesheimer | — | San Francisco Giants | Amateur free agent signing |
| Mar 21, 1978 | Released | Ed Kirkpatrick | Milwaukee Brewers | — | Release |
| Mar 20, 1978 | Released | Fred Kuhaulua | California Angels | — | Release |
| Mar 18, 1978 | Released | Carl Morton | Pittsburgh Pirates | — | Release |
| Mar 18, 1978 | Signed as free agent | Stan Perzanowski | — | Minnesota Twins | Free agent signing |
| Mar 18, 1978 | Released | Doug Rader | Toronto Blue Jays | — | Release |
| Mar 17, 1978 | Released | Ed Goodson | Los Angeles Dodgers | — | Release |
| Mar 16, 1978 | Signed | Victor Mata | — | New York Yankees | Amateur free agent signing |
| Mar 15, 1978 | Signed as free agent | Jim Bibby | — | Pittsburgh Pirates | Free agent signing |
| Mar 15, 1978 | Trade | Ken Henderson | Texas Rangers | New York Mets | Trade |
| Mar 15, 1978 | Trade | Dennis DeBarr | Toronto Blue Jays | Cleveland Indians | Trade |
| Mar 15, 1978 | Trade | Rico Carty | Cleveland Indians | Toronto Blue Jays | Trade |
| Mar 15, 1978 | Trade | Unnamed | Toronto Blue Jays | St. Louis Cardinals | $ |
| Mar 15, 1978 | Trade | Tom Bruno | Toronto Blue Jays | St. Louis Cardinals | Trade |
| Mar 15, 1978 | Trade | Rick Bosetti | St. Louis Cardinals | Toronto Blue Jays | Trade |
| Mar 15, 1978 | Trade | Unnamed | San Francisco Giants | Oakland Athletics | $300000 |
| Mar 15, 1978 | Trade | Vida Blue | Oakland Athletics | San Francisco Giants | Trade |
| Mar 15, 1978 | Trade | Gary Alexander | San Francisco Giants | Oakland Athletics | Trade |
| Mar 15, 1978 | Trade | Gary Thomasson | San Francisco Giants | Oakland Athletics | Trade |
| Mar 15, 1978 | Trade | Dave Heaverlo | San Francisco Giants | Oakland Athletics | Trade |
| Mar 15, 1978 | Trade | Alan Wirth | San Francisco Giants | Oakland Athletics | Trade |
| Mar 15, 1978 | Trade | John Henry Johnson | San Francisco Giants | Oakland Athletics | Trade |
| Mar 15, 1978 | Trade | Phil Huffman | San Francisco Giants | Oakland Athletics | Trade |
| Mar 14, 1978 | Released | Bob Detherage | Los Angeles Dodgers | — | Release |
| Mar 14, 1978 | Released | Enzo Hernandez | San Diego Padres | — | Release |
| Mar 14, 1978 | Signed | Charlie Puleo | — | Toronto Blue Jays | Amateur free agent signing |
| Mar 7, 1978 | Signed | George Bell | — | Philadelphia Phillies | Amateur free agent signing |
| Mar 6, 1978 | Trade | George Cappuzzello | Detroit Tigers | Cincinnati Reds | Trade |
| Mar 6, 1978 | Trade | John Valle | Detroit Tigers | Cincinnati Reds | Trade |
| Mar 6, 1978 | Trade | Jack Billingham | Cincinnati Reds | Detroit Tigers | Trade |
| Mar 2, 1978 | Signed as free agent | Wayne Simpson | — | Los Angeles Dodgers | Free agent signing |
| Mar 1, 1978 | Signed as free agent | Dan Briggs | — | Cleveland Indians | Free agent signing |
| Mar 1, 1978 | Signed as free agent | Jackie Brown | — | Texas Rangers | Free agent signing |
| Mar 1, 1978 | Released | Gary Nolan | Milwaukee Brewers | — | Release |
| Mar 1, 1978 | Signed as free agent | Rusty Torres | — | Texas Rangers | Free agent signing |
| Feb 28, 1978 | Trade | Mike Ivie | San Diego Padres | San Francisco Giants | Trade |
| Feb 28, 1978 | Trade | Derrel Thomas | San Francisco Giants | San Diego Padres | Trade |
| Feb 28, 1978 | Trade | Willie Horton | Texas Rangers | Cleveland Indians | Trade |
| Feb 28, 1978 | Trade | David Clyde | Texas Rangers | Cleveland Indians | Trade |
| Feb 28, 1978 | Trade | Tom Buskey | Cleveland Indians | Texas Rangers | Trade |
| Feb 28, 1978 | Trade | John Lowenstein | Cleveland Indians | Texas Rangers | Trade |
| Feb 27, 1978 | Signed as free agent | George Mitterwald | — | Seattle Mariners | Free agent signing |
| Feb 25, 1978 | Trade | Unnamed | Cincinnati Reds | Oakland Athletics | $ |
| Feb 25, 1978 | Trade | Doug Bair | Oakland Athletics | Cincinnati Reds | Trade |
| Feb 25, 1978 | Trade | Dave Revering | Cincinnati Reds | Oakland Athletics | Trade |
| Feb 23, 1978 | Signed as free agent | Frank Duffy | — | Cleveland Indians | Free agent signing |
| Feb 22, 1978 | Trade | Lynn McKinney | Kansas City Royals | Milwaukee Brewers | Trade |
| Feb 22, 1978 | Trade | Art Kusnyer | Milwaukee Brewers | Kansas City Royals | Trade |
| Feb 21, 1978 | Released | Tony Muser | Baltimore Orioles | — | Release |
| Feb 17, 1978 | Signed as free agent | Tom Burgmeier | — | Boston Red Sox | Free agent signing |
| Feb 15, 1978 | Signed as free agent | Luis Melendez | — | Toronto Blue Jays | Free agent signing |
| Feb 14, 1978 | Signed as free agent | Tom Spencer | — | Chicago White Sox | Free agent signing |
| Feb 11, 1978 | Signed as free agent | Orlando Gonzalez | — | Philadelphia Phillies | Free agent signing |
| Feb 10, 1978 | Signed as free agent | Tim Blackwell | — | Chicago Cubs | Free agent signing |
| Feb 10, 1978 | Signed as free agent | Gary Nolan | — | Milwaukee Brewers | Free agent signing |
| Feb 7, 1978 | Signed as free agent | Craig Skok | — | Atlanta Braves | Free agent signing |
| Feb 3, 1978 | Signed as free agent | Willie Crawford | — | Los Angeles Dodgers | Free agent signing |
| Feb 2, 1978 | Signed as free agent | Mickey Lolich | — | San Diego Padres | Free agent signing |
| Feb 2, 1978 | Signed as free agent | Ken Rudolph | — | St. Louis Cardinals | Free agent signing |
| Jan 30, 1978 | Signed as free agent | Rob Ellis | — | Cleveland Indians | Free agent signing |
| Jan 30, 1978 | Trade | Unnamed | Detroit Tigers | Boston Red Sox | $ |
| Jan 30, 1978 | Trade | Mike Burns | Detroit Tigers | Boston Red Sox | Trade |
| Jan 30, 1978 | Trade | Frank Harris | Detroit Tigers | Boston Red Sox | Trade |
| Jan 30, 1978 | Trade | Steve Dillard | Boston Red Sox | Detroit Tigers | Trade |
| Jan 27, 1978 | Released | Jackie Brown | Montreal Expos | — | Release |
| Jan 27, 1978 | Signed as free agent | Tom Griffin | — | California Angels | Free agent signing |
| Jan 25, 1978 | Trade | Unnamed | San Diego Padres | Texas Rangers | $125000 |
| Jan 25, 1978 | Trade | Gaylord Perry | Texas Rangers | San Diego Padres | Trade |
| Jan 25, 1978 | Trade | Dave Tomlin | San Diego Padres | Texas Rangers | Trade |
| Jan 24, 1978 | Signed as free agent | Steve Luebber | — | Chicago White Sox | Free agent signing |
| Jan 24, 1978 | Signed as free agent | Mike Pazik | — | Chicago White Sox | Free agent signing |
| Jan 21, 1978 | Signed as free agent | Mike Jorgensen | — | Texas Rangers | Free agent signing |
| Jan 18, 1978 | Signed | Leo Hernandez | — | Los Angeles Dodgers | Amateur free agent signing |
| Jan 16, 1978 | Signed as free agent | Mark DeJohn | — | Toronto Blue Jays | Free agent signing |
| Jan 16, 1978 | Released | Bob Heise | Kansas City Royals | — | Release |
| Jan 16, 1978 | Signed as free agent | Randy Stein | — | Milwaukee Brewers | Free agent signing |
| Jan 15, 1978 | Released | Gary Nolan | California Angels | — | Release |
| Jan 14, 1978 | Released | Tim Blackwell | Montreal Expos | — | Release |
| Jan 14, 1978 | Signed | Jackie Gutierrez | — | Boston Red Sox | Amateur free agent signing |
| Jan 13, 1978 | Released | Dave Wallace | Philadelphia Phillies | — | Release |
| Jan 6, 1978 | Signed | Juan Bonilla | — | Cleveland Indians | Amateur free agent signing |
| Jan 6, 1978 | Signed | Orlando Mercado | — | Seattle Mariners | Amateur free agent signing |
| Jan 6, 1978 | Released | Ken Rudolph | Baltimore Orioles | — | Release |
| Jan 3, 1978 | Signed as free agent | Gary Sutherland | — | St. Louis Cardinals | Free agent signing |
| before the 1978 season | Released | Rob Ellis | Milwaukee Brewers | — | Release |
| before the 1978 season | Signed as free agent | Carl Morton | — | Pittsburgh Pirates | Free agent signing |
| before the 1978 season | Released | Wayne Simpson | California Angels | — | 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.