All Transactions
Transactions listed are from November 1 of previous year to April 1 of the following year.
- November 2, 1977
Bruce Bochte of the Cleveland Indians granted free agency.
Lyman Bostock of the Minnesota Twins granted free agency.
Dan Briggs of the California Angels granted free agency.
Tom Burgmeier of the Minnesota Twins granted free agency.
Willie Crawford of the Oakland Athletics granted free agency.
Rawly Eastwick of the St. Louis Cardinals granted free agency.
Luis Gómez of the Minnesota Twins granted free agency.
Orlando González of the Cleveland Indians granted free agency.
Mario Guerrero of the California Angels granted free agency.
Tom Hausman of the Milwaukee Brewers granted free agency.
Larry Hisle of the Minnesota Twins granted free agency.
Larry Johnson of the Montreal Expos granted free agency.
Dave Kingman of the New York Yankees granted free agency.
Doc Medich of the New York Mets granted free agency.
Rick Miller of the Boston Red Sox granted free agency.
Mike Pazik of the Minnesota Twins granted free agency.
Mike Proly of the Minnesota Twins granted free agency.
Merv Rettenmund of the San Diego Padres granted free agency.
Ron Schueler of the Minnesota Twins granted free agency.
Horace Speed of the San Francisco Giants granted free agency.
Oscar Zamora of the Chicago Cubs granted free agency.
Richie Zisk of the Chicago White Sox granted free agency.
- November 4, 1977
Rich Hinton of the Cincinnati Reds granted free agency.
- November 5, 1977
Greg Pryor of the New York Yankees granted free agency.
Randy Stein of the California Angels granted free agency.
Jerry Terrell of the Minnesota Twins granted free agency.
- November 6, 1977
The Chicago White Sox signed Randy Scarbery as a free agent.
- November 9, 1977
The Texas Rangers signed Richie Zisk as a free agent.
Mike Marshall of the Texas Rangers granted free agency.
- November 10, 1977
The Montreal Expos purchased Darold Knowles from the Texas Rangers.
- November 11, 1977
The Toronto Blue Jays signed Luis Gómez as a free agent.
The Texas Rangers signed Doc Medich as a free agent.
The Seattle Mariners signed Bob Robertson as a free agent.
The Chicago Cubs released Dave Giusti.
- November 14, 1977
The Chicago White Sox signed Jim Hughes as a free agent.
- November 17, 1977
The Chicago White Sox signed Ron Blomberg as a free agent.
The Milwaukee Brewers signed Larry Hisle as a free agent.
- November 18, 1977
The Houston Astros signed Oscar Zamora as a free agent.
- November 21, 1977
The California Angels signed Lyman Bostock as a free agent.
The New York Mets signed Tom Hausman as a free agent.
The St. Louis Cardinals signed Luis DeLeón as an amateur free agent.
- November 22, 1977
The Los Angeles Dodgers signed Terry Forster as a free agent.
The New York Yankees signed Rich Gossage as a free agent.
The Chicago White Sox signed Mike Proly as a free agent.
The Minnesota Twins signed Mac Scarce as a free agent.
- November 23, 1977
The Baltimore Orioles signed Elrod Hendricks as a free agent.
The Boston Red Sox signed Mike Torrez as a free agent.
The Minnesota Twins purchased Dennis Lewallyn from the Los Angeles Dodgers.
The New York Yankees traded a player to be named later, Mike Fischlin and Randy Niemann to the Houston Astros for Cliff Johnson. The New York Yankees sent Dave Bergman (November 23, 1977) to the Houston Astros to complete the trade.
- November 24, 1977
The Chicago White Sox signed Larry Johnson as a free agent.
- November 28, 1977
The Chicago White Sox signed Eddie Bane as a free agent.
The Chicago White Sox signed Rich Hinton as a free agent.
The Chicago White Sox signed Junior Moore as a free agent.
The Chicago White Sox signed Greg Pryor as a free agent.
The San Francisco Giants purchased Art Gardner from the Houston Astros.
The Chicago White Sox traded players to be named later to the St. Louis Cardinals for Clay Carroll. The Chicago White Sox sent Nyls Nyman (September 2, 1977), Dave Hamilton (November 28, 1977) and Silvio Martínez (November 28, 1977) to the St. Louis Cardinals to complete the trade.
- November 29, 1977
The San Diego Padres signed Oscar Gamble as a free agent.
The Kansas City Royals signed Jerry Terrell as a free agent.
- November 30, 1977
The Boston Red Sox signed Jack Brohamer as a free agent.
The Chicago Cubs signed Dave Kingman as a free agent.
The New York Mets signed Elliott Maddox as a free agent.
- December 3, 1977
The Chicago White Sox signed Ron Schueler as a free agent.
- December 5, 1977
The Seattle Mariners drafted Rick Baldwin from the New York Mets in the 1977 rule 5 draft.
The Chicago White Sox drafted Jim Breazeale from the Atlanta Braves in the 1977 rule 5 draft.
The Oakland Athletics drafted Taylor Duncan from the St. Louis Cardinals in the 1977 rule 5 draft.
The Chicago Cubs drafted Jesús Figueroa from the New York Yankees in the 1977 rule 5 draft.
The Baltimore Orioles drafted Andy Replogle from the St. Louis Cardinals in the 1977 rule 5 draft.
The Minnesota Twins drafted John Sutton from the St. Louis Cardinals in the 1977 rule 5 draft.
The Toronto Blue Jays drafted Willie Upshaw from the New York Yankees in the 1977 rule 5 draft.
The Milwaukee Brewers drafted Ned Yost from the New York Mets in the 1977 rule 5 draft.
The California Angels traded Bobby Bonds, Thad Bosley and Richard Dotson to the Chicago White Sox for Brian Downing, Dave Frost and Chris Knapp.
The Chicago White Sox traded Jim Otten to the St. Louis Cardinals for Stan Butkus (minors).
The Houston Astros traded Leon Roberts to the Seattle Mariners for Jimmy Sexton.
The Chicago Cubs traded Dave Rosello to the Cleveland Indians for Norm Churchill (minors) and Bruce Compton (minors).
- December 6, 1977
The Cleveland Indians drafted Mike Cosgrove from the Houston Astros in the 1977 rule 5 draft.
The New York Yankees drafted Gil Rondón from the Houston Astros in the 1977 minor league draft.
The Baltimore Orioles drafted Jeff Terpko from the Montreal Expos in the 1977 minor league draft.
The Minnesota Twins drafted Jesús Vega from the Milwaukee Brewers in the 1977 minor league draft.
The New York Mets purchased Kevin Kobel from the Milwaukee Brewers.
The St. Louis Cardinals traded Víctor Cruz and Tom Underwood to the Toronto Blue Jays for a player to be named later and Pete Vuckovich. The Toronto Blue Jays sent John Scott (December 16, 1977) to the St. Louis Cardinals to complete the trade.
- December 7, 1977
The Cleveland Indians signed Horace Speed as a free agent.
The New York Mets purchased Tim Foli from the San Francisco Giants.
The New York Yankees purchased Andy Messersmith from the Atlanta Braves.
The Baltimore Orioles traded Rudy May, Randy Miller and Bryn Smith to the Montreal Expos for Joe Kerrigan, Gary Roenicke and Don Stanhouse.
The Baltimore Orioles traded Mike Parrott to the Seattle Mariners for Carlos López and Tommy Moore.
- December 8, 1977
The Toronto Blue Jays purchased Tom Hutton from the Philadelphia Phillies.
The Chicago Cubs traded Jerry Morales, Steve Swisher and cash to the St. Louis Cardinals for Héctor Cruz and Dave Rader.
The Boston Red Sox traded Don Aase and cash to the California Angels for Jerry Remy.
The Milwaukee Brewers traded George Frazier to the St. Louis Cardinals for Buck Martinez.
The California Angels traded Butch Alberts and Pat Kelly to the Toronto Blue Jays for Ron Fairly.
The Kansas City Royals traded Mark Littell and Buck Martinez to the St. Louis Cardinals for Al Hrabosky.
As part of a 4-team trade: The Atlanta Braves sent Willie Montañez to the New York Mets. The Texas Rangers sent a player to be named later and Tom Grieve to the New York Mets. The Texas Rangers sent Bert Blyleven to the Pittsburgh Pirates. The Texas Rangers sent Tommy Boggs, Adrian Devine and Eddie Miller to the Atlanta Braves. The New York Mets sent John Milner to the Pittsburgh Pirates. The New York Mets sent Jon Matlack to the Texas Rangers. The Pittsburgh Pirates sent Nelson Norman and Al Oliver to the Texas Rangers. The Texas Rangers sent Ken Henderson (March 15, 1978) to the New York Mets to complete the trade.
- December 9, 1977
The New York Yankees signed Rawly Eastwick as a free agent.
The Kansas City Royals purchased Jim Nettles from the Pittsburgh Pirates.
The Houston Astros traded Ron Selak (minors) to the St. Louis Cardinals for Randy Wiles.
The Boston Red Sox traded Jack Baker to the Cleveland Indians for Garry Hancock.
The Detroit Tigers traded Ben Oglivie to the Milwaukee Brewers for Rich Folkers and Jim Slaton.
The Cincinnati Reds traded Shane Rawley to the Seattle Mariners for Dave Collins.
The Cleveland Indians traded Charlie Spikes to the Detroit Tigers for Tom Veryzer.
The New York Mets traded Roy Staiger to the New York Yankees for Sergio Ferrer.
- December 10, 1977
The San Diego Padres released Gary Sutherland.
- December 11, 1977
The Seattle Mariners signed Reggie Walton as a free agent.
- December 12, 1977
The Chicago White Sox signed Mike Eden as a free agent.
The New York Mets released Mark DeJohn.
The Chicago White Sox traded Bob Polinsky (minors), Tommy Cruz and Jim Spencer to the New York Yankees for Ed Ricks (minors), Stan Thomas and cash.
- December 13, 1977
The Atlanta Braves released Steve Hargan.
- December 14, 1977
The Milwaukee Brewers released Ken McMullen.
The Boston Red Sox traded Fergie Jenkins to the Texas Rangers for John Poloni and cash.
- December 15, 1977
The San Francisco Giants signed Mario Guerrero as a free agent.
The Milwaukee Brewers purchased Andy Etchebarren from the California Angels.
The Los Angeles Dodgers traded Rex Hudson to the Minnesota Twins for Bill Butler.
- December 19, 1977
The Houston Astros signed Jesús Alou as a free agent.
- December 20, 1977
The Seattle Mariners signed Bruce Bochte as a free agent.
The Los Angeles Dodgers signed Germán Rivera as an amateur free agent.
- December 21, 1977
The Montreal Expos signed Ross Grimsley as a free agent.
The California Angels signed Rick Miller as a free agent.
The Seattle Mariners purchased Joe Decker from Mexico City Reds (Mexican).
- December 27, 1977
The Boston Red Sox signed Dick Drago as a free agent.
- December 31, 1977
The Milwaukee Brewers signed Ray Fosse as a free agent.
- Before 1978 Season
The Pittsburgh Pirates signed Carl Morton as a free agent.
The Milwaukee Brewers released Rob Ellis.
The California Angels released Wayne Simpson.
Mike Cosgrove sent from the Cleveland Indians to the Toronto Blue Jays in an unknown transaction.
- January 3, 1978
The St. Louis Cardinals signed Gary Sutherland as a free agent.
- January 5, 1978
Mickey Lolich of the New York Mets granted free agency.
- January 6, 1978
The Cleveland Indians signed Juan Bonilla as an amateur free agent.
The Seattle Mariners signed Orlando Mercado as an amateur free agent.
The Baltimore Orioles released Ken Rudolph.
- January 10, 1978
The Seattle Mariners drafted Jim Maler in the 1st round (5th pick) of the 1978 amateur draft (January).
The San Diego Padres drafted Mike Martin in the 1st round (6th pick) of the 1978 amateur draft (January Secondary).
The Montreal Expos drafted Tony Phillips in the 1st round (10th pick) of the 1978 amateur draft (January Secondary). Player signed March 10, 1978.
The Detroit Tigers drafted Chris Codiroli in the 1st round (11th pick) of the 1978 amateur draft (January).
The Boston Red Sox drafted Brian Denman in the 1st round (13th pick) of the 1978 amateur draft (January Secondary).
The Minnesota Twins drafted Ralph Citarella in the 1st round (15th pick) of the 1978 amateur draft (January), but was not signed.
The Cincinnati Reds drafted Brad Lesley in the 1st round (18th pick) of the 1978 amateur draft (January), but was not signed.
The Oakland Athletics drafted Scott Fletcher in the 1st round (21st pick) of the 1978 amateur draft (January Secondary), but was not signed.
The Los Angeles Dodgers drafted Brian Holton in the 1st round (22nd pick) of the 1978 amateur draft (January).
The Milwaukee Brewers drafted Doug Loman in the 2nd round of the 1978 amateur draft (January).
The Minnesota Twins drafted Jesse Orosco in the 2nd round of the 1978 amateur draft (January).
The Houston Astros drafted Pat Perry in the 2nd round of the 1978 amateur draft (January).
The Minnesota Twins drafted Mike Couchee in the 2nd round of the 1978 amateur draft (January Secondary), but was not signed.
The Toronto Blue Jays drafted Mike Richardt in the 2nd round of the 1978 amateur draft (January), but was not signed.
The Boston Red Sox drafted Matt Young in the 2nd round of the 1978 amateur draft (January), but was not signed.
The Cincinnati Reds drafted Paul Gibson in the 3rd round of the 1978 amateur draft (January).
The Milwaukee Brewers drafted Doug Jones in the 3rd round of the 1978 amateur draft (January). Player signed May 18, 1978.
The Toronto Blue Jays drafted Geno Petralli in the 3rd round of the 1978 amateur draft (January).
The New York Mets drafted Marty Barrett in the 3rd round of the 1978 amateur draft (January), but was not signed.
The Seattle Mariners drafted Dann Bilardello in the 3rd round of the 1978 amateur draft (January), but was not signed.
The Minnesota Twins drafted Willie Lozado in the 3rd round of the 1978 amateur draft (January Secondary), but was not signed.
The St. Louis Cardinals drafted Dave Meier in the 3rd round of the 1978 amateur draft (January Secondary), but was not signed.
The San Diego Padres drafted Ed Vande Berg in the 3rd round of the 1978 amateur draft (January), but was not signed.
The St. Louis Cardinals drafted Gary Gaetti in the 4th round of the 1978 amateur draft (January), but was not signed.
The New York Yankees drafted Rusty McNealy in the 4th round of the 1978 amateur draft (January), but was not signed.
The New York Mets drafted Ricky Jones in the 5th round of the 1978 amateur draft (January), but was not signed.
The Los Angeles Dodgers drafted Bryan Little in the 5th round of the 1978 amateur draft (January), but was not signed.
The New York Mets drafted Jamie Nelson in the 8th round of the 1978 amateur draft (January).
The Oakland Athletics drafted Larry White in the 10th round of the 1978 amateur draft (January), but was not signed.
- January 12, 1978
The Kansas City Royals purchased Gary Christenson from the Detroit Tigers.
- January 13, 1978
The Philadelphia Phillies released Dave Wallace.
- January 14, 1978
The Boston Red Sox signed Jackie Gutiérrez as an amateur free agent.
The Montreal Expos released Tim Blackwell.
- January 15, 1978
The California Angels released Gary Nolan.
- January 16, 1978
The Toronto Blue Jays signed Mark DeJohn as a free agent.
The Milwaukee Brewers signed Randy Stein as a free agent.
The Kansas City Royals released Bob Heise.
- January 18, 1978
The Los Angeles Dodgers signed Leo Hernández as an amateur free agent.
- January 21, 1978
The Texas Rangers signed Mike Jorgensen as a free agent.
- January 23, 1978
The Seattle Mariners purchased Roy Branch from the Kansas City Royals.
- January 24, 1978
The Chicago White Sox signed Steve Luebber as a free agent.
The Chicago White Sox signed Mike Pazik as a free agent.
- January 25, 1978
The San Diego Padres traded Dave Tomlin and $125,000 to the Texas Rangers for Gaylord Perry.
- January 27, 1978
The California Angels signed Tom Griffin as a free agent.
The Montreal Expos released Jackie Brown.
- January 30, 1978
The Cleveland Indians signed Rob Ellis as a free agent.
The Montreal Expos purchased Tito Fuentes from the Detroit Tigers.
The Boston Red Sox traded Steve Dillard to the Detroit Tigers for Mike Burns (minors), Frank Harris (minors) and cash.
- January 31, 1978
The Pittsburgh Pirates purchased Elías Sosa from the Los Angeles Dodgers.
- February 2, 1978
The San Diego Padres signed Mickey Lolich as a free agent.
The St. Louis Cardinals signed Ken Rudolph as a free agent.
- February 3, 1978
The Los Angeles Dodgers signed Willie Crawford as a free agent.
- February 7, 1978
The Atlanta Braves signed Craig Skok as a free agent.
- February 8, 1978
The Milwaukee Brewers purchased Gorman Thomas from the Texas Rangers.
- February 10, 1978
The Chicago Cubs signed Tim Blackwell as a free agent.
The Milwaukee Brewers signed Gary Nolan as a free agent.
- February 11, 1978
The Philadelphia Phillies signed Orlando González as a free agent.
- February 14, 1978
The Chicago White Sox signed Tom Spencer as a free agent.
- February 15, 1978
The Toronto Blue Jays signed Luis Meléndez as a free agent.
The Chicago White Sox purchased Frank Ortenzio from the Montreal Expos.
- February 17, 1978
The Boston Red Sox signed Tom Burgmeier as a free agent.
- February 21, 1978
The Baltimore Orioles released Tony Muser.
- February 22, 1978
The Kansas City Royals traded Lynn McKinney (minors) to the Milwaukee Brewers for Art Kusnyer.
- February 23, 1978
The Cleveland Indians signed Frank Duffy as a free agent.
- February 25, 1978
The Toronto Blue Jays purchased Steve Grilli from the Detroit Tigers.
The Cincinnati Reds traded Dave Revering and cash to the Oakland Athletics for Doug Bair.
- February 27, 1978
The Seattle Mariners signed George Mitterwald as a free agent.
- February 28, 1978
The Cleveland Indians traded Tom Buskey and John Lowenstein to the Texas Rangers for David Clyde and Willie Horton.
The San Diego Padres traded Mike Ivie to the San Francisco Giants for Derrel Thomas.
- March 1, 1978
The Cleveland Indians signed Dan Briggs as a free agent.
The Texas Rangers signed Jackie Brown as a free agent.
The Texas Rangers signed Rusty Torres as a free agent.
The Milwaukee Brewers released Gary Nolan.
- March 2, 1978
The Los Angeles Dodgers signed Wayne Simpson as a free agent.
Durango (Mexican) purchased Jerry Hairston from the Pittsburgh Pirates.
- March 6, 1978
Jim Bibby of the Cleveland Indians granted free agency.
The Cincinnati Reds traded Jack Billingham to the Detroit Tigers for John Valle (minors) and George Cappuzzello.
- March 7, 1978
The Philadelphia Phillies signed George Bell as an amateur free agent.
- March 14, 1978
The Toronto Blue Jays signed Charlie Puleo as an amateur free agent.
The Los Angeles Dodgers released Bob Detherage.
The San Diego Padres released Enzo Hernández.
- March 15, 1978
The Pittsburgh Pirates signed Jim Bibby as a free agent.
The Minnesota Twins returned Dennis Lewallyn to the Los Angeles Dodgers following previous purchase.
The Oakland Athletics traded Vida Blue to the San Francisco Giants for a player to be named later, Gary Alexander, Dave Heaverlo, Phil Huffman, John Henry Johnson, Gary Thomasson, Alan Wirth and $300,000. The San Francisco Giants sent Mario Guerrero (April 7, 1978) to the Oakland Athletics to complete the trade.
The St. Louis Cardinals traded Rick Bosetti to the Toronto Blue Jays for Tom Bruno and cash.
The Cleveland Indians traded Rico Carty to the Toronto Blue Jays for Dennis DeBarr.
- March 16, 1978
The New York Yankees signed Víctor Mata as an amateur free agent.
- March 17, 1978
The Los Angeles Dodgers released Ed Goodson.
- March 18, 1978
The Minnesota Twins signed Stan Perzanowski as a free agent.
The Pittsburgh Pirates released Carl Morton.
The Toronto Blue Jays released Doug Rader.
- March 20, 1978
The California Angels released Fred Kuhaulua.
- March 21, 1978
The San Francisco Giants signed Alan Hargesheimer as an amateur free agent.
The Milwaukee Brewers released Ed Kirkpatrick.
- March 22, 1978
The Montreal Expos released Tito Fuentes.
The Toronto Blue Jays released Jerry Johnson.
The Baltimore Orioles released Tommy Moore.
- March 23, 1978
The Minnesota Twins released Don Carrithers.
The Detroit Tigers released Rich Folkers.
The Detroit Tigers released Roric Harrison.
The California Angels traded Mickey Scott to the Toronto Blue Jays for Mike Cosgrove.
The Seattle Mariners selected Santo Alcalá off waivers from the Montreal Expos.
- March 24, 1978
The New York Mets traded Bud Harrelson to the Philadelphia Phillies for Fred Andrews and cash.
The Boston Red Sox traded Rick Kreuger to the Cleveland Indians for Frank Duffy.
- March 25, 1978
The California Angels signed Merv Rettenmund as a free agent.
The Boston Red Sox released Tommy Helms.
The Oakland Athletics traded Sheldon Mallory to the Toronto Blue Jays for Steve Staggs.
- March 26, 1978
The Cleveland Indians selected Mike Vail off waivers from the New York Mets.
- March 27, 1978
The San Francisco Giants released Randy Elliott.
The Seattle Mariners released Bob Galasso.
The Seattle Mariners released Skip Jutze.
The Seattle Mariners released Mike Kekich.
The Detroit Tigers released Vern Ruhle.
The Toronto Blue Jays released Héctor Torres.
The Houston Astros released Danny Walton.
The New York Mets traded Jackson Todd to the Philadelphia Phillies for Ed Cuervo (minors).
The Toronto Blue Jays selected Larry Demery off waivers from the Pittsburgh Pirates.
- March 28, 1978
The Texas Rangers signed Mark Mercer as a free agent.
The Houston Astros signed Vern Ruhle as a free agent.
The Cincinnati Reds purchased Dave Tomlin from the Texas Rangers.
The Oakland Athletics released Dick Allen.
The St. Louis Cardinals released Mike Anderson.
The St. Louis Cardinals released Larry Dierker.
The Boston Red Sox released Denny Doyle.
The Baltimore Orioles released Ed Farmer.
The San Diego Padres released Brent Strom.
The Oakland Athletics released Mark Williams.
- March 29, 1978
The Minnesota Twins purchased José Morales from the Montreal Expos.
The Toronto Blue Jays purchased Mike Stanton from the Houston Astros.
The Toronto Blue Jays released Joe Henderson.
The Chicago White Sox released Jim Hughes.
The Chicago Cubs traded Pete Broberg to the Oakland Athletics for Rodney Scott and cash.
The Boston Red Sox traded Jim Burton to the New York Mets for Leo Foster.
The Montreal Expos traded Will McEnaney to the Pittsburgh Pirates for Timothy Jones.
- March 30, 1978
The Pittsburgh Pirates signed Roric Harrison as a free agent.
The Milwaukee Brewers released Steve Brye.
The Atlanta Braves released Buzz Capra.
The Chicago White Sox released Clay Carroll.
The Atlanta Braves released Vic Correll.
The Los Angeles Dodgers released Willie Crawford.
The Milwaukee Brewers released Larry Haney.
The Milwaukee Brewers released Von Joshua.
The Oakland Athletics released Larry Lintz.
The Atlanta Braves released Tom Paciorek.
The Cincinnati Reds released Bill Plummer.
The Atlanta Braves released Craig Robinson.
The Chicago White Sox released Stan Thomas.
The Houston Astros traded Jim Fuller to the Pittsburgh Pirates for Dave Augustine.
The Chicago White Sox traded Jim Essian and Steve Renko to the Oakland Athletics for Pablo Torrealba.
The Boston Red Sox traded Ted Cox, Bo Díaz, Mike Paxton and Rick Wise to the Cleveland Indians for Dennis Eckersley and Fred Kendall.
- March 31, 1978
The Toronto Blue Jays signed Dave Wallace as a free agent.
The Oakland Athletics released Matt Alexander.
The Montreal Expos released Rick Sawyer.
The Toronto Blue Jays returned Larry Demery to the Pittsburgh Pirates following previous waiver selection.
- April, 1978
The Pittsburgh Pirates signed Clay Carroll as a free agent.
The Los Angeles Dodgers signed Enzo Hernández as a free agent. (Date given is approximate. Exact date is uncertain.)
- April 1, 1978
The Milwaukee Brewers signed Ed Farmer as a free agent.
The Milwaukee Brewers signed Bob Galasso as a free agent.
The Oakland Athletics purchased Mike Adams from the Chicago Cubs.
The Texas Rangers released Tom Buskey.
The Chicago White Sox released Bob Coluccio.
The Chicago White Sox released Bart Johnson.
The Kansas City Royals released Dave Nelson.
The New York Mets released Cliff Speck.
The Chicago White Sox released Royle Stillman.
- April 2, 1978
The Texas Rangers signed Jim Hughes as a free agent.
- April 3, 1978
The St. Louis Cardinals purchased Tommy Toms from the San Francisco Giants.
- April 4, 1978
The Pittsburgh Pirates signed Steve Brye as a free agent.
The Milwaukee Brewers signed Tony Muser as a free agent.
The Kansas City Royals purchased Randy Bass from the Minnesota Twins.
The Toronto Blue Jays purchased John Mayberry from the Kansas City Royals.
The Oakland Athletics traded Manny Sanguillén to the Pittsburgh Pirates for a player to be named later, Miguel Diloné and Elías Sosa. The Pittsburgh Pirates sent Mike Edwards (April 7, 1978) to the Oakland Athletics to complete the trade.
The Milwaukee Brewers selected Andy Replogle off waivers from the Baltimore Orioles.
- April 5, 1978
The Philadelphia Phillies purchased Ramón Avilés from the Boston Red Sox.
The Chicago White Sox purchased Jim Willoughby from the Boston Red Sox.
The Chicago White Sox traded Mike Ondina (minors) to the Kansas City Royals for Joe Gates.
The New York Mets selected Butch Metzger off waivers from the St. Louis Cardinals.
- April 6, 1978
The Houston Astros signed Bob Coluccio as a free agent.
The Los Angeles Dodgers signed Ubaldo Heredia as a free agent.
The Seattle Mariners signed Bill Plummer as a free agent.
The Philadelphia Phillies released Terry Harmon.
- April 7, 1978
The Atlanta Braves signed Tom Paciorek as a free agent.
The New York Yankees signed Paul Boris as an amateur free agent.
The Atlanta Braves signed Steve Hammond as an amateur free agent.
- April 9, 1978
The Cincinnati Reds signed Vic Correll as a free agent.
The Pittsburgh Pirates released Roric Harrison.
- April 10, 1978
The Philadelphia Phillies signed Alejandro Sánchez as an amateur free agent.
The Toronto Blue Jays released Mark DeJohn.
- April 11, 1978
The Cleveland Indians signed Randy Elliott as a free agent.
The Toronto Blue Jays purchased Don Kirkwood from the Chicago White Sox.
- April 13, 1978
The Philadelphia Phillies signed Cliff Speck as a free agent.
The Toronto Blue Jays purchased Balor Moore from the California Angels.
The Seattle Mariners released Reggie Walton.
- April 14, 1978
The Philadelphia Phillies signed Mike Anderson as a free agent.
The Chicago White Sox returned Frank Ortenzio to the Montreal Expos following previous purchase.
The Cleveland Indians released Pat Dobson.
- April 18, 1978
The Texas Rangers purchased Reggie Cleveland from the Boston Red Sox.
- April 19, 1978
The Detroit Tigers signed Mark DeJohn as a free agent.
- April 23, 1978
The Philadelphia Phillies signed Julio Franco as an amateur free agent.
- April 28, 1978
The Minnesota Twins signed Roric Harrison as a free agent.
The Milwaukee Brewers traded Tim Johnson to the Toronto Blue Jays for Tim Nordbrook.
- May 6, 1978
The Boston Red Sox signed Steve Crawford as an amateur free agent.
- May 10, 1978
The New York Yankees released Fran Healy.
- May 13, 1978
The Toronto Blue Jays signed Tom Buskey as a free agent.
- May 15, 1978
The Minnesota Twins signed Mike Marshall as a free agent.
- May 16, 1978
The Atlanta Braves signed Jim Bouton as a free agent.
The Chicago White Sox traded Bobby Bonds to the Texas Rangers for Rusty Torres and Claudell Washington.
- May 17, 1978
The Cincinnati Reds signed Ben Hayes as an amateur free agent.
The Milwaukee Brewers purchased Dave May from the Texas Rangers.
The Oakland Athletics released Marty Perez.
The Oakland Athletics released Earl Williams.
The Los Angeles Dodgers traded Glenn Burke to the Oakland Athletics for Bill North.
- May 18, 1978
The Cleveland Indians signed Larry Lintz as a free agent.
The Chicago Cubs released Gerry Pirtle.
- May 19, 1978
The Cincinnati Reds traded Dale Murray to the New York Mets for Ken Henderson.
- May 20, 1978
The Cleveland Indians signed Ed Goodson as a free agent.
The Boston Red Sox signed Bob Ojeda as an amateur free agent.
The Los Angeles Dodgers traded Mike Garman to the Montreal Expos for Gerry Hannahs and Larry Landreth.
- May 22, 1978
The Toronto Blue Jays purchased Joe Coleman from the Oakland Athletics.
- May 23, 1978
The Atlanta Braves released Tom Paciorek.
- May 26, 1978
The St. Louis Cardinals released Gary Sutherland.
The San Diego Padres traded George Hendrick to the St. Louis Cardinals for Eric Rasmussen.
- May 27, 1978
The Montreal Expos signed Gerry Pirtle as a free agent.
- May 28, 1978
The Pittsburgh Pirates purchased Dave Hamilton from the St. Louis Cardinals.
- May 31, 1978
The Seattle Mariners signed Tom Paciorek as a free agent.
- June 1, 1978
The Pittsburgh Pirates released Jim Fregosi.
The Kansas City Royals traded Jim Colborn to the Seattle Mariners for Steve Braun.
- June 2, 1978
The Pittsburgh Pirates purchased Kim Allen from the California Angels.
The Kansas City Royals released Joe Lahoud.
- June 5, 1978
The Seattle Mariners traded Steve Hamrick (minors) to the Kansas City Royals for a player to be named later. The Kansas City Royals sent Gary Lance (September 29, 1978) to the Seattle Mariners to complete the trade.
The San Diego Padres selected Fernando González off waivers from the Pittsburgh Pirates.
- June 6, 1978
The Los Angeles Dodgers signed Candy Maldonado as an amateur free agent.
The Atlanta Braves drafted Bob Horner in the 1st round (1st pick) of the 1978 amateur draft.
The Kansas City Royals drafted Craig Chamberlain in the 1st round (2nd pick) of the 1978 amateur draft (June Secondary).
The Toronto Blue Jays drafted Lloyd Moseby in the 1st round (2nd pick) of the 1978 amateur draft.
The New York Mets drafted Hubie Brooks in the 1st round (3rd pick) of the 1978 amateur draft.
The Oakland Athletics drafted Mike Morgan in the 1st round (4th pick) of the 1978 amateur draft.
The San Diego Padres drafted Andy Hawkins in the 1st round (5th pick) of the 1978 amateur draft.
The Houston Astros drafted Scott Fletcher in the 1st round (5th pick) of the 1978 amateur draft (June Secondary), but was not signed.
The Los Angeles Dodgers drafted Dann Bilardello in the 1st round (7th pick) of the 1978 amateur draft (June Secondary).
The Cincinnati Reds drafted Brad Lesley in the 1st round (9th pick) of the 1978 amateur draft (June Secondary).
The Texas Rangers drafted Mike Richardt in the 1st round (10th pick) of the 1978 amateur draft (June Secondary).
The Detroit Tigers drafted Kirk Gibson in the 1st round (12th pick) of the 1978 amateur draft.
The Chicago Cubs drafted Bill Hayes in the 1st round (13th pick) of the 1978 amateur draft.
The California Angels drafted Tom Brunansky in the 1st round (14th pick) of the 1978 amateur draft.
The Minnesota Twins drafted Lenny Faedo in the 1st round (16th pick) of the 1978 amateur draft.
The Cincinnati Reds drafted Nick Esasky in the 1st round (17th pick) of the 1978 amateur draft.
The New York Yankees drafted Rex Hudler in the 1st round (18th pick) of the 1978 amateur draft. Player signed June 20, 1978.
The Oakland Athletics drafted Tim Conroy in the 1st round (20th pick) of the 1978 amateur draft.
The Boston Red Sox drafted Marty Barrett in the 1st round (20th pick) of the 1978 amateur draft (June Secondary), but was not signed.
The New York Yankees drafted Matt Winters in the 1st round (24th pick) of the 1978 amateur draft.
The Kansas City Royals drafted Buddy Biancalana in the 1st round (25th pick) of the 1978 amateur draft.
The Oakland Athletics drafted Keith Atherton in the 2nd round of the 1978 amateur draft.
The New York Yankees drafted Steve Balboni in the 2nd round of the 1978 amateur draft.
The Cleveland Indians drafted Chris Bando in the 2nd round of the 1978 amateur draft.
The San Diego Padres drafted Doug Gwosdz in the 2nd round of the 1978 amateur draft.
The Chicago Cubs drafted Mel Hall in the 2nd round of the 1978 amateur draft. Player signed June 8, 1978.
The Houston Astros drafted Danny Heep in the 2nd round of the 1978 amateur draft.
The Kansas City Royals drafted Bill Laskey in the 2nd round of the 1978 amateur draft (June Secondary).
The Kansas City Royals drafted Darryl Motley in the 2nd round of the 1978 amateur draft.
The Baltimore Orioles drafted Cal Ripken Jr. in the 2nd round of the 1978 amateur draft. Player signed June 13, 1978.
The Baltimore Orioles drafted Larry Sheets in the 2nd round of the 1978 amateur draft.
The Atlanta Braves drafted Matt Sinatro in the 2nd round of the 1978 amateur draft.
The Seattle Mariners drafted Dave Valle in the 2nd round of the 1978 amateur draft. Player signed June 11, 1978.
The Cincinnati Reds drafted Dave Van Gorder in the 2nd round of the 1978 amateur draft.
The Cincinnati Reds drafted Ralph Citarella in the 2nd round of the 1978 amateur draft (June Secondary), but was not signed.
The Atlanta Braves drafted Steve Bedrosian in the 3rd round of the 1978 amateur draft. Player signed June 10, 1978.
The Baltimore Orioles drafted Bobby Bonner in the 3rd round of the 1978 amateur draft.
The Chicago White Sox drafted Britt Burns in the 3rd round of the 1978 amateur draft.
The California Angels drafted Dave Engle in the 3rd round of the 1978 amateur draft.
The New York Mets drafted Brian Giles in the 3rd round of the 1978 amateur draft.
The Milwaukee Brewers drafted Rickey Keeton in the 3rd round of the 1978 amateur draft.
The Kansas City Royals drafted Mark Ryal in the 3rd round of the 1978 amateur draft.
The San Diego Padres drafted George Stablein in the 3rd round of the 1978 amateur draft.
The Chicago White Sox drafted Gary Gaetti in the 3rd round of the 1978 amateur draft (June Secondary), but was not signed.
The Minnesota Twins drafted Dave Leeper in the 3rd round of the 1978 amateur draft, but was not signed.
The St. Louis Cardinals drafted Mike Moore in the 3rd round of the 1978 amateur draft, but was not signed.
The Detroit Tigers drafted Fran Mullins in the 3rd round of the 1978 amateur draft, but was not signed.
The Atlanta Braves drafted Rick Behenna in the 4th round of the 1978 amateur draft.
The St. Louis Cardinals drafted George Bjorkman in the 4th round of the 1978 amateur draft.
The San Francisco Giants drafted Rob Deer in the 4th round of the 1978 amateur draft.
The Philadelphia Phillies drafted Ed Hearn in the 4th round of the 1978 amateur draft.
The Montreal Expos drafted Dave Hostetler in the 4th round of the 1978 amateur draft.
The New York Yankees drafted Tim Lollar in the 4th round of the 1978 amateur draft.
The Houston Astros drafted Ron Meridith in the 4th round of the 1978 amateur draft.
The Detroit Tigers drafted Jerry Ujdur in the 4th round of the 1978 amateur draft.
The California Angels drafted Mike Witt in the 4th round of the 1978 amateur draft.
The Oakland Athletics drafted Mike Woodard in the 4th round of the 1978 amateur draft.
The St. Louis Cardinals drafted Ed Vande Berg in the 4th round of the 1978 amateur draft (June Secondary), but was not signed.
The Detroit Tigers drafted Marty Castillo in the 5th round of the 1978 amateur draft.
The San Diego Padres drafted Floyd Chiffer in the 5th round of the 1978 amateur draft.
The Cincinnati Reds drafted Jeff Lahti in the 5th round of the 1978 amateur draft.
The Oakland Athletics drafted Scott Meyer in the 5th round of the 1978 amateur draft.
The San Francisco Giants drafted Jeff Ransom in the 5th round of the 1978 amateur draft.
The Toronto Blue Jays drafted Dave Stieb in the 5th round of the 1978 amateur draft.
The Chicago Cubs drafted Jon Perlman in the 5th round of the 1978 amateur draft, but was not signed.
The Baltimore Orioles drafted Mike Boddicker in the 6th round of the 1978 amateur draft.
The Texas Rangers drafted Terry Bogener in the 6th round of the 1978 amateur draft.
The New York Mets drafted Mike Fitzgerald in the 6th round of the 1978 amateur draft.
The San Diego Padres drafted Tim Flannery in the 6th round of the 1978 amateur draft.
The Los Angeles Dodgers drafted Mike Marshall in the 6th round of the 1978 amateur draft.
The New York Yankees drafted Andy McGaffigan in the 6th round of the 1978 amateur draft.
The Oakland Athletics drafted Kelvin Moore in the 6th round of the 1978 amateur draft.
The Montreal Expos drafted Bill Mooneyham in the 6th round of the 1978 amateur draft, but was not signed.
The Detroit Tigers drafted Bruce Fields in the 7th round of the 1978 amateur draft.
The San Diego Padres drafted Steve Fireovid in the 7th round of the 1978 amateur draft.
The Seattle Mariners drafted John Hobbs in the 7th round of the 1978 amateur draft.
The Toronto Blue Jays drafted Brian Milner in the 7th round of the 1978 amateur draft.
The Baltimore Orioles drafted Don Welchel in the 7th round of the 1978 amateur draft.
The Cleveland Indians drafted Mike Young in the 7th round of the 1978 amateur draft, but was not signed.
The Atlanta Braves drafted José Álvarez in the 8th round of the 1978 amateur draft.
The Kansas City Royals drafted Jeff Cornell in the 8th round of the 1978 amateur draft.
The Texas Rangers drafted Wayne Tolleson in the 8th round of the 1978 amateur draft.
The San Francisco Giants drafted Alvin Davis in the 8th round of the 1978 amateur draft, but was not signed.
The California Angels drafted Tim Wallach in the 8th round of the 1978 amateur draft, but was not signed.
The Montreal Expos drafted Charlie Lea in the 9th round of the 1978 amateur draft.
The Cincinnati Reds drafted Charlie Leibrandt in the 9th round of the 1978 amateur draft.
The Los Angeles Dodgers drafted Steve Sax in the 9th round of the 1978 amateur draft.
The Minnesota Twins drafted Tony Fossas in the 9th round of the 1978 amateur draft, but was not signed.
The Seattle Mariners drafted Bob Stoddard in the 10th round of the 1978 amateur draft.
The Montreal Expos drafted Tom Wieghaus in the 10th round of the 1978 amateur draft.
The Texas Rangers drafted Allan Ramirez in the 10th round of the 1978 amateur draft, but was not signed.
The Toronto Blue Jays drafted Dave Baker in the 11th round of the 1978 amateur draft.
The New York Mets drafted Randy Johnson in the 11th round of the 1978 amateur draft.
The Houston Astros drafted Jack Lazorko in the 11th round of the 1978 amateur draft.
The Seattle Mariners drafted Vance McHenry in the 11th round of the 1978 amateur draft.
The Atlanta Braves drafted Gerald Perry in the 11th round of the 1978 amateur draft.
The San Francisco Giants drafted John Rabb in the 11th round of the 1978 amateur draft.
The Texas Rangers drafted Chris Smith in the 11th round of the 1978 amateur draft.
The Philadelphia Phillies drafted Dwight Taylor in the 11th round of the 1978 amateur draft, but was not signed.
The Houston Astros drafted Tim Tolman in the 12th round of the 1978 amateur draft.
The Minnesota Twins drafted Scott Bradley in the 12th round of the 1978 amateur draft, but was not signed.
The California Angels drafted Jeff Schattinger in the 12th round of the 1978 amateur draft, but was not signed.
The Boston Red Sox drafted John Lickert in the 13th round of the 1978 amateur draft.
The Montreal Expos drafted Jim Deshaies in the 13th round of the 1978 amateur draft, but was not signed.
The Chicago Cubs drafted Mark Gilbert in the 14th round of the 1978 amateur draft.
The California Angels drafted Dan Whitmer in the 14th round of the 1978 amateur draft.
The New York Yankees drafted Andy Beene in the 14th round of the 1978 amateur draft, but was not signed.
The Detroit Tigers drafted Mike Mason in the 14th round of the 1978 amateur draft, but was not signed.
The Chicago White Sox drafted Bob Meacham in the 14th round of the 1978 amateur draft, but was not signed.
The Texas Rangers drafted Charlie O'Brien in the 14th round of the 1978 amateur draft, but was not signed.
The Cincinnati Reds drafted Gary Redus in the 15th round of the 1978 amateur draft. Player signed June 10, 1978.
The Kansas City Royals drafted Don Heinkel in the 15th round of the 1978 amateur draft, but was not signed.
The Chicago Cubs drafted Mark Langston in the 15th round of the 1978 amateur draft, but was not signed.
The Oakland Athletics drafted Jim Scranton in the 15th round of the 1978 amateur draft, but was not signed.
The Cincinnati Reds drafted Skeeter Barnes in the 16th round of the 1978 amateur draft. Player signed June 8, 1978.
The New York Yankees drafted Brian Dayett in the 16th round of the 1978 amateur draft.
The Detroit Tigers drafted Dave Rucker in the 16th round of the 1978 amateur draft. Player signed June 15, 1978.
The California Angels drafted John Christensen in the 16th round of the 1978 amateur draft, but was not signed.
The Milwaukee Brewers drafted Tim Teufel in the 16th round of the 1978 amateur draft, but was not signed.
The Kansas City Royals drafted Frank Viola in the 16th round of the 1978 amateur draft, but was not signed.
The New York Yankees drafted Don Cooper in the 17th round of the 1978 amateur draft.
The Minnesota Twins drafted Kent Hrbek in the 17th round of the 1978 amateur draft.
The Cincinnati Reds drafted Tom Lawless in the 17th round of the 1978 amateur draft.
The Montreal Expos drafted Razor Shines in the 18th round of the 1978 amateur draft.
The San Diego Padres drafted Eric Show in the 18th round of the 1978 amateur draft.
The Pittsburgh Pirates drafted John Stuper in the 18th round of the 1978 amateur draft.
The Los Angeles Dodgers drafted Eric Bullock in the 18th round of the 1978 amateur draft, but was not signed.
The St. Louis Cardinals drafted Bob Skube in the 18th round of the 1978 amateur draft, but was not signed.
The Los Angeles Dodgers drafted Gary Weiss in the 19th round of the 1978 amateur draft.
The Milwaukee Brewers drafted Kevin McReynolds in the 19th round of the 1978 amateur draft, but was not signed.
The Montreal Expos drafted Pat Rooney in the 20th round of the 1978 amateur draft.
The Philadelphia Phillies drafted Ryne Sandberg in the 20th round of the 1978 amateur draft. Player signed June 15, 1978.
The San Francisco Giants drafted Mark Calvert in the 21st round of the 1978 amateur draft.
The Pittsburgh Pirates drafted Dave Dravecky in the 21st round of the 1978 amateur draft.
The Seattle Mariners drafted Dave Edler in the 21st round of the 1978 amateur draft.
The Cincinnati Reds drafted Otis Nixon in the 21st round of the 1978 amateur draft, but was not signed.
The New York Mets drafted Mark Davis in the 22nd round of the 1978 amateur draft, but was not signed.
The New York Yankees drafted Howard Johnson in the 23rd round of the 1978 amateur draft, but was not signed.
The New York Mets drafted Rick Anderson in the 24th round of the 1978 amateur draft.
The Kansas City Royals drafted Ron Johnson in the 24th round of the 1978 amateur draft.
The Philadelphia Phillies drafted Rick Leach in the 24th round of the 1978 amateur draft, but was not signed.
The San Diego Padres drafted Mark Thurmond in the 24th round of the 1978 amateur draft, but was not signed.
The San Diego Padres drafted Paul Noce in the 25th round of the 1978 amateur draft, but was not signed.
The San Diego Padres drafted Randy Kramer in the 26th round of the 1978 amateur draft, but was not signed.
The Detroit Tigers drafted John Martin in the 27th round of the 1978 amateur draft.
The Pittsburgh Pirates drafted Jeff Zaske in the 27th round of the 1978 amateur draft.
The New York Mets drafted Al Lachowicz in the 27th round of the 1978 amateur draft, but was not signed.
The Texas Rangers drafted Jim Farr in the 29th round of the 1978 amateur draft.
The Milwaukee Brewers drafted Rob Murphy in the 29th round of the 1978 amateur draft, but was not signed.
The Chicago Cubs drafted Mike Diaz in the 30th round of the 1978 amateur draft.
The Texas Rangers drafted Gene Nelson in the 30th round of the 1978 amateur draft.
The Oakland Athletics drafted Greg Booker in the 32nd round of the 1978 amateur draft, but was not signed.
The Pittsburgh Pirates drafted Vance Law in the 39th round of the 1978 amateur draft.
The Texas Rangers drafted Tim Hulett in the 39th round of the 1978 amateur draft, but was not signed.
The St. Louis Cardinals drafted Curt Wardle in the 45th round of the 1978 amateur draft, but was not signed.
- June 7, 1978
The Milwaukee Brewers signed Jaime Cocanower as an amateur free agent.
- June 8, 1978
The Houston Astros traded Bob Coluccio to the St. Louis Cardinals for Frank Riccelli.
- June 9, 1978
The Kansas City Royals signed Bob Detherage as a free agent.
The California Angels signed Steve Brown as an amateur free agent.
The Montreal Expos purchased Ed Herrmann from the Houston Astros.
The Chicago Cubs traded Woodie Fryman to the Montreal Expos for a player to be named later. The Montreal Expos sent Jerry White (June 23, 1978) to the Chicago Cubs to complete the trade.
- June 10, 1978
The California Angels released Alan Wiggins.
The New York Yankees traded Ken Holtzman to the Chicago Cubs for a player to be named later. The Chicago Cubs sent Ron Davis (June 12, 1978) to the New York Yankees to complete the trade.
- June 12, 1978
The Seattle Mariners purchased Bryan Clark from the Pittsburgh Pirates.
- June 14, 1978
The New York Yankees traded Rawly Eastwick to the Philadelphia Phillies for Bobby Brown and Jay Johnstone.
The Cleveland Indians traded Dennis Kinney to the San Diego Padres for Dan Spillner.
- June 15, 1978
The Cleveland Indians purchased Bernie Carbo from the Boston Red Sox.
The San Francisco Giants purchased Roger Metzger from the Houston Astros.
The New York Yankees traded Dell Alston, Mickey Klutts and $50,000 to the Oakland Athletics for Gary Thomasson.
The Chicago Cubs traded Héctor Cruz to the San Francisco Giants for Lynn McGlothen.
The St. Louis Cardinals traded a player to be named later to the San Francisco Giants for Frank Riccelli. The St. Louis Cardinals sent Jim Dwyer (June 15, 1978) to the San Francisco Giants to complete the trade.
The Atlanta Braves traded Dick Ruthven to the Philadelphia Phillies for Gene Garber.
The Chicago Cubs traded Joe Wallis to the Cleveland Indians for Mike Vail.
The Cleveland Indians traded Joe Wallis to the Oakland Athletics for Gary Alexander.
- June 16, 1978
The Los Angeles Dodgers signed Dave Sax as an amateur free agent.
- June 19, 1978
The New York Mets signed Marty Perez as a free agent.
The Chicago Cubs signed Bill Earley as an amateur free agent.
- June 20, 1978
The Oakland Athletics signed Tito Fuentes as a free agent.
- June 22, 1978
The Cleveland Indians traded Bill Laxton to the San Diego Padres for Dave Freisleben.
- June 23, 1978
The St. Louis Cardinals selected Roy Thomas off waivers from the Houston Astros.
The Philadelphia Phillies released Mike Anderson.
The Baltimore Orioles signed Mike Anderson as a free agent.
- June 26, 1978
The Seattle Mariners traded José Báez to the St. Louis Cardinals for a player to be named later. The St. Louis Cardinals sent Mike Potter (October 27, 1978) to the Seattle Mariners to complete the trade.
The Chicago Cubs traded Paul Reuschel to the Cleveland Indians for Dennis DeBarr.
- June 28, 1978
The New York Yankees signed Tom Filer as an amateur free agent.
- June 30, 1978
The Philadelphia Phillies signed Carmelo Castillo as an amateur free agent.
The Pittsburgh Pirates released Kim Allen.
- July 1, 1978
The Pittsburgh Pirates released Gibson Alba.
The Houston Astros traded Joe Ferguson and cash to the Los Angeles Dodgers for players to be named later. The Los Angeles Dodgers sent Rafael Landestoy (July 7, 1978) and Jeffrey Leonard (September 11, 1978) to the Houston Astros to complete the trade.
- July 2, 1978
The Baltimore Orioles signed Kim Allen as a free agent.
- July 3, 1978
The Cleveland Indians released Willie Horton.
- July 4, 1978
The Philadelphia Phillies purchased Butch Metzger from the New York Mets.
- July 7, 1978
The Los Angeles Dodgers released Ron Kittle.
- July 13, 1978
The Oakland Athletics signed Willie Horton as a free agent.
The Cleveland Indians released Al Fitzmorris.
- July 17, 1978
The Chicago White Sox signed Guy Hoffman as an amateur free agent.
- July 18, 1978
The California Angels signed Al Fitzmorris as a free agent.
The St. Louis Cardinals traded John Tamargo to the San Francisco Giants for a player to be named later. The San Francisco Giants sent Rob Dressler (July 24, 1978) to the St. Louis Cardinals to complete the trade.
- July 20, 1978
The Montreal Expos purchased Tom Hutton from the Toronto Blue Jays.
- July 21, 1978
The New York Mets signed Al Pedrique as an amateur free agent.
The St. Louis Cardinals purchased Wayne Garrett from the Montreal Expos.
- July 24, 1978
The Boston Red Sox purchased Andy Hassler from the Kansas City Royals.
- July 26, 1978
The Oakland Athletics released Tito Fuentes.
- July 28, 1978
The California Angels traded Gil Flores to the New York Mets for a player to be named later. The New York Mets sent Pepe Mangual (July 29, 1978) to the California Angels to complete the trade.
- August 1, 1978
The New York Yankees purchased Paul Lindblad from the Texas Rangers.
- August 3, 1978
The Kansas City Royals traded Gerald Ako (minors) and cash to the Milwaukee Brewers for Jamie Quirk.
- August 6, 1978
The Chicago Cubs traded Larry Anderson to the Philadelphia Phillies for Davey Johnson.
- August 15, 1978
The Oakland Athletics traded Willie Horton and Phil Huffman to the Toronto Blue Jays for Rico Carty.
- August 16, 1978
The Kansas City Royals selected Steve Foucault off waivers from the Detroit Tigers.
- August 25, 1978
The Philadelphia Phillies signed Don Carman as an amateur free agent.
The Los Angeles Dodgers released Enzo Hernández.
- August 26, 1978
The Detroit Tigers signed Howard Bailey as an amateur free agent.
- August 27, 1978
The Kansas City Royals signed Brad Wellman as an amateur free agent.
- August 31, 1978
The Cleveland Indians traded Johnny Grubb to the Texas Rangers for players to be named later. The Texas Rangers sent Bobby Cuellar (October 3, 1978) and Dave Rivera (minors) (October 3, 1978) to the Cleveland Indians to complete the trade.
- September 1, 1978
The Pittsburgh Pirates signed Matt Alexander as a free agent.
The Milwaukee Brewers signed Larry Haney as a free agent.
The Chicago Cubs signed Cookie Rojas as a free agent.
- September 2, 1978
The Houston Astros traded Dan Larson to the Philadelphia Phillies for Dan Warthen.
- September 3, 1978
The Kansas City Royals signed Marvell Wynne as an amateur free agent.
- September 4, 1978
The Chicago White Sox signed Ron Kittle as a free agent.
- September 5, 1978
The Kansas City Royals released Steve Foucault.
The Houston Astros released Gene Pentz.
The Philadelphia Phillies selected Pete Mackanin off waivers from the Montreal Expos.
- September 10, 1978
The Los Angeles Dodgers signed Alejandro Peña as an amateur free agent.
- September 11, 1978
The Houston Astros purchased Mike Buskey from the Philadelphia Phillies.
- September 12, 1978
The San Diego Padres traded Mark Wiley to the Toronto Blue Jays for Andrew Dyes (minors).
- September 13, 1978
The Pittsburgh Pirates purchased Dave May from the Milwaukee Brewers.
- September 14, 1978
The Philadelphia Phillies purchased Horacio Piña from Aguascalientes (Mexican).
- September 21, 1978
The Boston Red Sox released Juan Agosto.
- September 22, 1978
The Pittsburgh Pirates purchased Cito Gaston from the Atlanta Braves.
- September 24, 1978
The Milwaukee Brewers signed David Green as an amateur free agent.
- September 25, 1978
The Pittsburgh Pirates signed Gene Pentz as a free agent.
The Toronto Blue Jays purchased Dale Mohorcic from Victoria (Northwest).
The Detroit Tigers released Charlie Spikes.
- October 2, 1978
The Seattle Mariners purchased Reggie Walton from Coahuila (Mexican).
The Montreal Expos released Ed Herrmann.
The New York Mets traded Paul Siebert to the St. Louis Cardinals for Bob Coluccio.
- October 3, 1978
The Toronto Blue Jays purchased Rico Carty from the Oakland Athletics.
The Minnesota Twins released Dave Johnson.
The Cleveland Indians traded Larvell Blanks and Jim Kern to the Texas Rangers for Len Barker and Bobby Bonds.
- October 13, 1978
The Philadelphia Phillies returned Horacio Piña to Aguascalientes (Mexican) following previous purchase.
- October 17, 1978
The Pittsburgh Pirates released Clay Carroll.
The Chicago Cubs released Davey Johnson.
The Chicago Cubs released Cookie Rojas.
- October 20, 1978
The Baltimore Orioles released Mike Anderson.
- October 23, 1978
The Pittsburgh Pirates released Will McEnaney.
The Chicago White Sox traded Jim Willoughby to the St. Louis Cardinals for John Scott.
- October 24, 1978
The Texas Rangers released Sandy Alomar.
- October 25, 1978
The San Diego Padres traded Oscar Gamble, Dave Roberts and $300,000 to the Texas Rangers for Kurt Bevacqua, Bill Fahey and Mike Hargrove.
- October 26, 1978
The Chicago Cubs released Rudy Meoli.
- October 27, 1978
The Boston Red Sox purchased Mike Easler from the Pittsburgh Pirates.
The Chicago White Sox released Steve Luebber.
- October 30, 1978
The Houston Astros signed Álvaro Espinoza as an amateur free agent.
- November, 1978
The Seattle Mariners returned Santo Alcalá to the Montreal Expos following previous waiver selection.
- November 2, 1978
Jim Barr of the San Francisco Giants granted free agency.
Jim Bouton of the Atlanta Braves granted free agency.
Pete Broberg of the Oakland Athletics granted free agency.
Steve Brye of the Pittsburgh Pirates granted free agency.
Al Bumbry of the Baltimore Orioles granted free agency.
Bernie Carbo of the Cleveland Indians granted free agency.
Rico Carty of the Toronto Blue Jays granted free agency.
Jim Colborn of the Seattle Mariners granted free agency.
Joe Coleman of the Toronto Blue Jays granted free agency.
Duffy Dyer of the Pittsburgh Pirates granted free agency.
Darrell Evans of the San Francisco Giants granted free agency.
Al Fitzmorris of the California Angels granted free agency.
Jerry Grote of the Los Angeles Dodgers granted free agency.
Larry Gura of the Kansas City Royals granted free agency.
Dave Hamilton of the Pittsburgh Pirates granted free agency.
Bud Harrelson of the Philadelphia Phillies granted free agency.
Vic Harris of the San Francisco Giants granted free agency.
Tommy John of the Los Angeles Dodgers granted free agency.
Fred Kendall of the Boston Red Sox granted free agency.
Darold Knowles of the Montreal Expos granted free agency.
Lee Lacy of the Los Angeles Dodgers granted free agency.
Mike Lum of the Cincinnati Reds granted free agency.
Mike Marshall of the Minnesota Twins granted free agency.
Bill North of the Los Angeles Dodgers granted free agency.
Tom Paciorek of the Seattle Mariners granted free agency.
Bill Plummer of the Seattle Mariners granted free agency.
Steve Renko of the Oakland Athletics granted free agency.
Dave Roberts of the Chicago Cubs granted free agency.
Pete Rose of the Cincinnati Reds granted free agency.
Jim Slaton of the Detroit Tigers granted free agency.
Elías Sosa of the Oakland Athletics granted free agency.
Steve Stone of the Chicago White Sox granted free agency.
Derrel Thomas of the San Diego Padres granted free agency.
Luis Tiant of the Boston Red Sox granted free agency.
Del Unser of the Montreal Expos granted free agency.
Darrell Woodard of the Oakland Athletics granted free agency.
Wilbur Wood of the Chicago White Sox granted free agency.
The California Angels released Tom Griffin.
The Milwaukee Brewers released Larry Haney.
- November 3, 1978
The Cleveland Indians traded Dave Freisleben to the Toronto Blue Jays for a player to be named later. The Toronto Blue Jays sent Sheldon Mallory (March 27, 1979) to the Cleveland Indians to complete the trade.
- November 6, 1978
The Pittsburgh Pirates released Dave May.
The New York Yankees released Andy Messersmith.
- November 10, 1978
The New York Yankees traded Mike Heath, Sparky Lyle, Larry McCall, Dave Rajsich, Domingo Ramos and cash to the Texas Rangers for Greg Jemison (minors), Juan Beníquez, Mike Griffin, Paul Mirabella and Dave Righetti.
- November 13, 1978
The Kansas City Royals signed Larry Gura as a free agent.
The New York Yankees signed Luis Tiant as a free agent.
- November 14, 1978
The Los Angeles Dodgers signed Derrel Thomas as a free agent.
- November 21, 1978
The New York Yankees signed Tommy John as a free agent.
- November 23, 1978
The Houston Astros signed Manny Hernández as an amateur free agent.
- November 24, 1978
The Toronto Blue Jays signed Toby Hernández as an amateur free agent.
The Toronto Blue Jays signed Fred Manrique as an amateur free agent.
- November 27, 1978
The Toronto Blue Jays signed José Escobar as an amateur free agent.
The Houston Astros traded Joe Cannon, Pete Hernández and Mark Lemongello to the Toronto Blue Jays for Alan Ashby.
The Baltimore Orioles selected John Lowenstein off waivers from the Texas Rangers.
- November 28, 1978
The Montreal Expos signed Duffy Dyer as a free agent.
The Milwaukee Brewers signed Jim Slaton as a free agent.
- November 29, 1978
The Baltimore Orioles signed Steve Stone as a free agent.
- November 30, 1978
The Seattle Mariners purchased Paul Lindblad from the New York Yankees.
- December 2, 1978
Willie Horton of the Toronto Blue Jays granted free agency.
The Toronto Blue Jays released Bill Singer.
- December 3, 1978
The California Angels signed Jim Barr as a free agent.
The Milwaukee Brewers signed Willie Lozado as an amateur free agent.
- December 4, 1978
The New York Mets drafted Bobby Brown from the New York Yankees in the 1978 rule 5 draft.
The Toronto Blue Jays drafted Bob Davis from the San Diego Padres in the 1978 rule 5 draft.
The New York Mets drafted Mike Howard from the Los Angeles Dodgers in the 1978 rule 5 draft.
The Detroit Tigers drafted Lynn Jones from the Cincinnati Reds in the 1978 rule 5 draft.
The Montreal Expos drafted Ken Macha from the Pittsburgh Pirates in the 1978 rule 5 draft.
The Detroit Tigers drafted Dave Machemer from the California Angels in the 1978 rule 5 draft.
The Baltimore Orioles drafted Jeff Schneider from the Philadelphia Phillies in the 1978 rule 5 draft.
The San Francisco Giants drafted Max Venable from the Los Angeles Dodgers in the 1978 rule 5 draft.
The Toronto Blue Jays drafted Ted Wilborn from the New York Yankees in the 1978 rule 5 draft.
The Detroit Tigers released Chuck Scrivener.
The Houston Astros traded Don Pisker (minors) to the Toronto Blue Jays for Gary Woods.
The California Angels traded Danny Goodwin and Ron Jackson to the Minnesota Twins for Dan Ford.
The Detroit Tigers traded John Murphy (minors) and Bob Sykes to the St. Louis Cardinals for Aurelio López and Jerry Morales.
- December 5, 1978
The Cleveland Indians drafted Carmelo Castillo from the Philadelphia Phillies in the 1978 minor league draft.
The Seattle Mariners drafted Keith MacWhorter from the Boston Red Sox in the 1978 minor league draft.
The San Francisco Giants signed Darrell Evans as a free agent.
The Philadelphia Phillies signed Pete Rose as a free agent.
The Montreal Expos purchased Tony Solaita from the California Angels.
The New York Mets traded Tom Grieve and Kim Seaman to the St. Louis Cardinals for Pete Falcone.
The Cleveland Indians traded Phil Lansford (minors) and Alfredo Griffin to the Toronto Blue Jays for Víctor Cruz.
The Pittsburgh Pirates traded Odell Jones, Mario Mendoza and Rafael Vásquez to the Seattle Mariners for Rick Jones, Tom McMillan and Enrique Romo.
- December 6, 1978
The Seattle Mariners purchased Bobby Thompson from the Texas Rangers.
The Cleveland Indians traded Cardell Camper to the Philadelphia Phillies for Joe Charboneau.
- December 7, 1978
The Boston Red Sox traded Bill Lee to the Montreal Expos for Stan Papi.
- December 8, 1978
The Minnesota Twins traded a player to be named later and Greg Field (minors) to the New York Mets for Jerry Koosman. The Minnesota Twins sent Jesse Orosco (February 7, 1979) to the New York Mets to complete the trade.
The Houston Astros traded Floyd Bannister to the Seattle Mariners for Craig Reynolds.
The Cleveland Indians traded Buddy Bell to the Texas Rangers for Toby Harrah.
The Montreal Expos traded Mike Hart to the Texas Rangers for Jim Mason.
- December 9, 1978
The Chicago Cubs signed Carmelo Martínez as an amateur free agent.
The Montreal Expos signed Randy St. Claire as an amateur free agent.
- December 12, 1978
The Minnesota Twins released Mark Souza.
- December 13, 1978
The Detroit Tigers released Mickey Stanley.
The Minnesota Twins traded Mac Scarce to the Texas Rangers for Mike Bacsik.
- December 14, 1978
The Chicago Cubs traded Rodney Scott and Jerry White to the Montreal Expos for Sam Mejías.
- December 15, 1978
Yucatan (Mexican) purchased Gil Rondón from the New York Yankees.
The Milwaukee Brewers traded Ed Farmer, Gary Holle and cash to the Texas Rangers for Reggie Cleveland.
- December 21, 1978
The Seattle Mariners signed Mario Díaz as an amateur free agent.
The Milwaukee Brewers purchased Steve Lake from the Baltimore Orioles.
- Before 1979 Season
The Atlanta Braves signed Buzz Capra as a free agent.
The Philadelphia Phillies signed Dave May as a free agent.
The Toronto Blue Jays signed Luis Leal as an amateur free agent.
The New York Mets released Billy Baldwin.
The Philadelphia Phillies released Steve Waterbury.
Larry Anderson sent from the Philadelphia Phillies to the Houston Astros in an unknown transaction.
Larry Johnson sent from the Chicago White Sox to Miami (Inter-American) in an unknown transaction.
Max León sent from the Atlanta Braves to Durango (Mexican) in an unknown transaction.
- January 4, 1979
The Toronto Blue Jays signed Chuck Scrivener as a free agent.
- January 6, 1979
The Minnesota Twins signed Mike Marshall as a free agent.
- January 8, 1979
The Montreal Expos signed Elías Sosa as a free agent.
- January 9, 1979
The Los Angeles Dodgers purchased Von Joshua from Tabasco (Mexican).
The Philadelphia Phillies drafted Mark Davis in the 1st round (1st pick) of the 1979 amateur draft (January Secondary).
The New York Mets drafted Neal Heaton in the 1st round (1st pick) of the 1979 amateur draft (January), but was not signed.
The Cincinnati Reds drafted Bill Bordley in 1979, but pick was voided.
The California Angels drafted Otis Nixon in the 1st round (4th pick) of the 1979 amateur draft (January Secondary), but was not signed.
The Oakland Athletics drafted Lemmie Miller in the 1st round (6th pick) of the 1979 amateur draft (January), but was not signed.
The Houston Astros drafted Jeff Dedmon in the 1st round (7th pick) of the 1979 amateur draft (January), but was not signed.
The St. Louis Cardinals drafted Bill Mooneyham in the 1st round (7th pick) of the 1979 amateur draft (January Secondary), but was not signed.
The Detroit Tigers drafted Howard Johnson in the 1st round (12th pick) of the 1979 amateur draft (January Secondary).
The Kansas City Royals drafted Jeff Schattinger in the 1st round (21st pick) of the 1979 amateur draft (January Secondary).
The Kansas City Royals drafted Mike Brewer in the 1st round (22nd pick) of the 1979 amateur draft (January).
The Toronto Blue Jays drafted Mark Eichhorn in the 2nd round of the 1979 amateur draft (January). Player signed May 18, 1979.
The Atlanta Braves drafted Milt Thompson in the 2nd round of the 1979 amateur draft (January). Player signed January 12, 1979.
The Oakland Athletics drafted Bob Fallon in the 2nd round of the 1979 amateur draft (January), but was not signed.
The Milwaukee Brewers drafted Jeff Heathcock in the 2nd round of the 1979 amateur draft (January), but was not signed.
The Minnesota Twins drafted Mike Mason in the 2nd round of the 1979 amateur draft (January Secondary), but was not signed.
The Montreal Expos drafted Jim Weaver in the 2nd round of the 1979 amateur draft (January), but was not signed.
The Chicago White Sox drafted Randy Johnson in the 3rd round of the 1979 amateur draft (January).
The Seattle Mariners drafted Carlos Diaz in the 3rd round of the 1979 amateur draft (January), but was not signed.
The California Angels drafted Al Newman in the 3rd round of the 1979 amateur draft (January), but was not signed.
The California Angels drafted Curt Wardle in the 3rd round of the 1979 amateur draft (January Secondary), but was not signed.
The Montreal Expos drafted Randy O'Neal in the 4th round of the 1979 amateur draft (January), but was not signed.
The Pittsburgh Pirates drafted Rick Ownbey in the 4th round of the 1979 amateur draft (January), but was not signed.
The Minnesota Twins drafted Ed Hodge in the 5th round of the 1979 amateur draft (January).
The Toronto Blue Jays drafted Jeff Moronko in the 5th round of the 1979 amateur draft (January), but was not signed.
The San Diego Padres drafted Larry See in the 5th round of the 1979 amateur draft (January), but was not signed.
The California Angels drafted Gary Pettis in the 6th round of the 1979 amateur draft (January).
The Kansas City Royals drafted Mike Bielecki in the 6th round of the 1979 amateur draft (January), but was not signed.
The St. Louis Cardinals drafted Bill Lindsey in the 6th round of the 1979 amateur draft (January), but was not signed.
The Atlanta Braves drafted Brook Jacoby in the 7th round of the 1979 amateur draft (January).
The New York Mets drafted Rusty Tillman in the 10th round of the 1979 amateur draft (January).
The St. Louis Cardinals drafted Greg Bargar in the 12th round of the 1979 amateur draft (January), but was not signed.
- January 11, 1979
The Toronto Blue Jays signed Rico Carty as a free agent.
- January 15, 1979
The Seattle Mariners signed Tom Paciorek as a free agent.
- January 16, 1979
The St. Louis Cardinals signed Darold Knowles as a free agent.
The Baltimore Orioles traded Mike Dimmel to the St. Louis Cardinals for Benny Ayala.
- January 17, 1979
The Baltimore Orioles released Nelson Briles.
The Montreal Expos released Fred Holdsworth.
- January 19, 1979
The Pittsburgh Pirates signed Lee Lacy as a free agent.
The Boston Red Sox signed Steve Renko as a free agent.
The Montreal Expos signed Andrés Galarraga as an amateur free agent.
The Cleveland Indians signed Dave Hudgens as an amateur free agent.
- January 20, 1979
The Chicago Cubs signed Steve Waterbury as a free agent.
- January 21, 1979
The Detroit Tigers signed Larry Pashnick as an amateur free agent.
- January 23, 1979
Nippon Ham Fighters (Japan Pacific) purchased Sam Ewing from the Toronto Blue Jays.
- January 25, 1979
The Pittsburgh Pirates traded John Stuper to the St. Louis Cardinals for Tommy Sandt.
- January 26, 1979
The Los Angeles Dodgers signed Alan Wiggins as a free agent.
- January 27, 1979
The Seattle Mariners signed Jim Colborn as a free agent.
The Seattle Mariners signed Willie Horton as a free agent.
- January 29, 1979
The California Angels released Bob Jones.
The Seattle Mariners released Bob Robertson.
- January 30, 1979
The Baltimore Orioles signed Al Bumbry as a free agent.
- February 1, 1979
The Seattle Mariners signed Bill Plummer as a free agent.
- February 3, 1979
The New York Yankees purchased Bruce Robinson from the Oakland Athletics for $400,000.
The Boston Red Sox traded Dave Coleman to the Minnesota Twins for Larry Wolfe.
The California Angels traded Dave Engle, Paul Hartzell, Brad Havens and Ken Landreaux to the Minnesota Twins for Rod Carew.
- February 7, 1979
The San Diego Padres signed Steve Brye as a free agent.
The Los Angeles Dodgers signed Andy Messersmith as a free agent.
- February 8, 1979
The Minnesota Twins released Tom Johnson.
The Seattle Mariners released Jim Todd.
- February 12, 1979
The St. Louis Cardinals traded Tommy Toms to the Texas Rangers for Keith Smith.
- February 13, 1979
The Minnesota Twins released Rich Chiles.
The Minnesota Twins released Stan Perzanowski.
The Montreal Expos released Wayne Twitchell.
- February 14, 1979
The Kansas City Royals released Art Kusnyer.
- February 15, 1979
The Atlanta Braves signed Mike Lum as a free agent.
The St. Louis Cardinals released José Báez.
The Los Angeles Dodgers traded Brad Gulden to the New York Yankees for Gary Thomasson.
- February 19, 1979
The St. Louis Cardinals signed Will McEnaney as a free agent.
- February 20, 1979
The Detroit Tigers signed Fred Holdsworth as a free agent.
- February 22, 1979
The San Diego Padres signed Fred Kendall as a free agent.
The San Francisco Giants signed Dave Roberts as a free agent.
The Seattle Mariners purchased Mike Davey from the Atlanta Braves.
- February 23, 1979
The Los Angeles Dodgers signed Pete Broberg as a free agent.
The Chicago Cubs traded Greg Gross, Dave Rader and Manny Trillo to the Philadelphia Phillies for Henry Mack (minors), Derek Botelho, Barry Foote, Jerry Martin and Ted Sizemore.
- February 24, 1979
The Chicago White Sox signed Art Kusnyer as a free agent.
The San Francisco Giants signed Bill Bordley as an amateur free agent.
- February 25, 1979
The San Diego Padres signed Al Fitzmorris as a free agent.
- February 26, 1979
The Oakland Athletics purchased Darryl Cias from Salem (Northwest).
The Kansas City Royals purchased Eduardo Rodríguez from the Milwaukee Brewers.
- February 28, 1979
The Oakland Athletics signed Dave Hamilton as a free agent.
The Oakland Athletics signed Jim Todd as a free agent.
- March 1, 1979
The San Diego Padres signed Fred Kuhaulua as a free agent.
- March 5, 1979
The Philadelphia Phillies signed Mike Anderson as a free agent.
The Houston Astros signed Brent Strom as a free agent.
- March 6, 1979
The Milwaukee Brewers signed Vic Harris as a free agent.
- March 7, 1979
The Milwaukee Brewers signed Bob Gibson as an amateur free agent.
- March 10, 1979
The St. Louis Cardinals signed Bernie Carbo as a free agent.
The San Francisco Giants signed Bill North as a free agent.
- March 13, 1979
The Detroit Tigers traded Ed Glynn to the New York Mets for Mardie Cornejo.
- March 15, 1979
The Cleveland Indians signed Billy Baldwin as a free agent.
The Boston Red Sox purchased Jim Dwyer from the San Francisco Giants.
The Boston Red Sox traded Mike Easler to the Pittsburgh Pirates for George Hill (minors), Martin Rivas (minors) and cash.
- March 17, 1979
The Toronto Blue Jays signed Steve Luebber as a free agent.
The Seattle Mariners signed Ed Núñez as an amateur free agent.
- March 19, 1979
The Philadelphia Phillies released Dave May.
The Philadelphia Phillies released Butch Metzger.
- March 20, 1979
The Chicago Cubs traded Larry Cox to the Seattle Mariners for Luis Delgado.
The Detroit Tigers traded Steve Dillard to the Chicago Cubs for a player to be named later. The Chicago Cubs sent Ed Putman (March 24, 1979) to the Detroit Tigers to complete the trade.
- March 23, 1979
The Oakland Athletics released Dell Alston.
The Seattle Mariners released Frank MacCormack.
- March 24, 1979
The Seattle Mariners released Tom Brown.
The Seattle Mariners released Dick Pole.
- March 25, 1979
The Cleveland Indians released Randy Elliott.
The Toronto Blue Jays selected Bobby Brown off waivers from the New York Mets.
- March 26, 1979
The Baltimore Orioles released Elrod Hendricks.
The Texas Rangers released Roger Moret.
The New York Mets released Bobby Valentine.
- March 27, 1979
The California Angels signed Willie Davis as a free agent.
The Philadelphia Phillies signed Rudy Meoli as a free agent.
The Pittsburgh Pirates purchased Craig Cacek from the Houston Astros.
The Milwaukee Brewers purchased Skip James from the San Francisco Giants.
The Seattle Mariners released Paul Lindblad.
The Houston Astros released Dan Warthen.
The New York Mets traded Nino Espinosa to the Philadelphia Phillies for Richie Hebner and José Moreno.
- March 28, 1979
The Seattle Mariners purchased Joe Simpson from the Los Angeles Dodgers.
The Seattle Mariners released Jim Colborn.
The Seattle Mariners released Tom House.
The Seattle Mariners released Kevin Pasley.
The Chicago Cubs released Mike Sember.
The Seattle Mariners released Bobby Thompson.
The Milwaukee Brewers traded Gary Beare to the Philadelphia Phillies for Dan Boitano.
- March 29, 1979
The Philadelphia Phillies signed Del Unser as a free agent.
The Seattle Mariners purchased Terry Bulling from the Minnesota Twins.
The Toronto Blue Jays released Jeff Byrd.
The Philadelphia Phillies released Nardi Contreras.
The Toronto Blue Jays released Don Kirkwood.
The New York Mets released Lenny Randle.
- March 30, 1979
The Seattle Mariners signed Danny Walton as a free agent.
The Chicago White Sox released Ron Blomberg.
The Montreal Expos released Mike Garman.
The Atlanta Braves released Rod Gilbreath.
The Minnesota Twins released Sam Perlozzo.
The Cleveland Indians traded Dan Briggs to the San Diego Padres for a player to be named later. The San Diego Padres sent Mike Champion (April 3, 1979) to the Cleveland Indians to complete the trade.
The St. Louis Cardinals released Jim Willoughby.
The Chicago Cubs signed Jim Willoughby as a free agent.
- March 31, 1979
The Atlanta Braves traded Dave Campbell to the Montreal Expos for Pepe Frías.
- April 1, 1979
The San Francisco Giants signed Joe Coleman as a free agent.
The Montreal Expos purchased Art Gardner from the San Francisco Giants.
The transaction information used here was obtained free of charge from and is copyrighted by RetroSheet. We attempt to update transactions throughout the season.
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