All Transactions
Transactions listed are from November 1 of previous year to April 1 of the following year.
- November 1, 1976
Doyle Alexander of the New York Yankees granted free agency.
Sal Bando of the Oakland Athletics granted free agency.
Don Baylor of the Oakland Athletics granted free agency.
Bert Campaneris of the Oakland Athletics granted free agency.
Bill Campbell of the Minnesota Twins granted free agency.
Dave Cash of the Philadelphia Phillies granted free agency.
Nate Colbert of the Oakland Athletics granted free agency.
Paul Dade of the California Angels granted free agency.
Rollie Fingers of the Oakland Athletics granted free agency.
Wayne Garland of the Baltimore Orioles granted free agency.
Bobby Grich of the Baltimore Orioles granted free agency.
Don Gullett of the Cincinnati Reds granted free agency.
Richie Hebner of the Pittsburgh Pirates granted free agency.
Reggie Jackson of the Baltimore Orioles granted free agency.
Gary Matthews of the San Francisco Giants granted free agency.
Willie McCovey of the Oakland Athletics granted free agency.
Tim Nordbrook of the California Angels granted free agency.
Joe Rudi of the Oakland Athletics granted free agency.
Billy Smith of the California Angels granted free agency.
Eric Soderholm of the Minnesota Twins granted free agency.
Royle Stillman of the Baltimore Orioles granted free agency.
Steve Stone of the Chicago Cubs granted free agency.
Gene Tenace of the Oakland Athletics granted free agency.
The Baltimore Orioles released Darryl Cias.
The Los Angeles Dodgers released Jim Lyttle.
- November 2, 1976
The Los Angeles Dodgers released Leron Lee.
The Montreal Expos released Chuck Taylor.
The Philadelphia Phillies released Tony Taylor.
The Kansas City Royals traded Ron Washington to the Los Angeles Dodgers for Steve Patchin (minors).
- November 5, 1976
Dick Allen of the Philadelphia Phillies granted free agency.
The Toronto Blue Jays purchased Chuck Hartenstein from the San Diego Padres.
The Oakland Athletics purchased Tommy Helms from the Pittsburgh Pirates.
The Cleveland Indians traded Alan Ashby and Doug Howard to the Toronto Blue Jays for Al Fitzmorris.
The Oakland Athletics traded Chuck Tanner to the Pittsburgh Pirates for Manny Sanguillén and $100,000.
The Seattle Mariners drafted Ruppert Jones from the Kansas City Royals as the 1st pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Bob Bailor from the Baltimore Orioles as the 2nd pick in the 1976 expansion draft.
The Seattle Mariners drafted Gary Wheelock from the California Angels as the 3rd pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Jerry Garvin from the Minnesota Twins as the 4th pick in the 1976 expansion draft.
The Seattle Mariners drafted Bill Stein from the Chicago White Sox as the 5th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Jim Clancy from the Texas Rangers as the 6th pick in the 1976 expansion draft.
The Seattle Mariners drafted Dick Pole from the Boston Red Sox as the 7th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Gary Woods from the Oakland Athletics as the 8th pick in the 1976 expansion draft.
The Seattle Mariners drafted Dan Meyer from the Detroit Tigers as the 9th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Rico Carty from the Cleveland Indians as the 10th pick in the 1976 expansion draft.
The Seattle Mariners drafted Grant Jackson from the New York Yankees as the 11th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Butch Edge from the Milwaukee Brewers as the 12th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Al Fitzmorris from the Kansas City Royals as the 13th pick in the 1976 expansion draft.
The Seattle Mariners drafted Dave Collins from the California Angels as the 14th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Al Woods from the Minnesota Twins as the 15th pick in the 1976 expansion draft.
The Seattle Mariners drafted Frank MacCormack from the Detroit Tigers as the 16th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Mike Darr from the Baltimore Orioles as the 17th pick in the 1976 expansion draft.
The Seattle Mariners drafted Stan Thomas from the Cleveland Indians as the 18th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Pete Vuckovich from the Chicago White Sox as the 19th pick in the 1976 expansion draft.
The Seattle Mariners drafted Juan Bernhardt from the New York Yankees as the 20th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Jeff Byrd from the Texas Rangers as the 21st pick in the 1976 expansion draft.
The Seattle Mariners drafted Rick Jones from the Boston Red Sox as the 22nd pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Steve Bowling from the Milwaukee Brewers as the 23rd pick in the 1976 expansion draft.
The Seattle Mariners drafted Glenn Abbott from the Oakland Athletics as the 24th pick in the 1976 expansion draft.
The Seattle Mariners drafted Bob Stinson from the Kansas City Royals as the 25th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Dennis DeBarr from the Detroit Tigers as the 26th pick in the 1976 expansion draft.
The Seattle Mariners drafted Carlos López from the California Angels as the 27th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Bill Singer from the Minnesota Twins as the 28th pick in the 1976 expansion draft.
The Seattle Mariners drafted Dave Pagan from the Baltimore Orioles as the 29th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Jim Mason from the New York Yankees as the 30th pick in the 1976 expansion draft.
The Seattle Mariners drafted Roy Thomas from the Chicago White Sox as the 31st pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Doug Ault from the Texas Rangers as the 32nd pick in the 1976 expansion draft.
The Seattle Mariners drafted Tom McMillan from the Cleveland Indians as the 33rd pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Ernie Whitt from the Boston Red Sox as the 34th pick in the 1976 expansion draft.
The Seattle Mariners drafted Pete Broberg from the Milwaukee Brewers as the 35th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Steve Staggs from the Kansas City Royals as the 37th pick in the 1976 expansion draft.
The Seattle Mariners drafted Steve Braun from the Minnesota Twins as the 38th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Steve Hargan from the Texas Rangers as the 39th pick in the 1976 expansion draft.
The Seattle Mariners drafted Leroy Stanton from the California Angels as the 40th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Garth Iorg from the New York Yankees as the 41st pick in the 1976 expansion draft.
The Seattle Mariners drafted Bob Galasso from the Baltimore Orioles as the 42nd pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Dave Lemanczyk from the Detroit Tigers as the 43rd pick in the 1976 expansion draft.
The Seattle Mariners drafted Steve Burke from the Boston Red Sox as the 44th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Larry Anderson from the Milwaukee Brewers as the 45th pick in the 1976 expansion draft.
The Seattle Mariners drafted Joe Lis from the Cleveland Indians as the 46th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Jesse Jefferson from the Chicago White Sox as the 47th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Dave McKay from the Minnesota Twins as the 49th pick in the 1976 expansion draft.
The Seattle Mariners drafted Bill Laxton from the Detroit Tigers as the 50th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Tom Bruno from the Kansas City Royals as the 51st pick in the 1976 expansion draft.
The Seattle Mariners drafted Julio Cruz from the California Angels as the 52nd pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Otto Vélez from the New York Yankees as the 53rd pick in the 1976 expansion draft.
The Seattle Mariners drafted Steve Barr from the Texas Rangers as the 54th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Mike Willis from the Baltimore Orioles as the 55th pick in the 1976 expansion draft.
The Seattle Mariners drafted Luis Delgado from the Boston Red Sox as the 56th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Sam Ewing from the Chicago White Sox as the 57th pick in the 1976 expansion draft.
The Seattle Mariners drafted Tommy Smith from the Cleveland Indians as the 58th pick in the 1976 expansion draft.
The Toronto Blue Jays drafted Leon Hooten from the Oakland Athletics as the 59th pick in the 1976 expansion draft.
The Seattle Mariners drafted Greg Erardi from the Milwaukee Brewers as the 60th pick in the 1976 expansion draft.
- November 6, 1976
The Boston Red Sox signed Bill Campbell as a free agent.
The Detroit Tigers purchased Luis Alvarado from the St. Louis Cardinals.
The Seattle Mariners purchased John Montague from the Philadelphia Phillies.
The St. Louis Cardinals released Lloyd Allen.
The St. Louis Cardinals released Lee Richard.
The Cincinnati Reds traded Tom Carroll to the Pittsburgh Pirates for Jim Sadowski.
The Montreal Expos traded Steve Dunning, Pat Scanlon and Tony Scott to the St. Louis Cardinals for Bill Greif, Sam Mejías and Ángel Torres.
The Chicago White Sox traded Hugh Yancy to the Cincinnati Reds for Tom Spencer.
- November 8, 1976
The Cincinnati Reds traded Mike Thompson to the Texas Rangers for Art DeFilippis (minors).
- November 9, 1976
The Oakland Athletics released Billy Williams.
- November 10, 1976
The Detroit Tigers signed Al Greene as an amateur free agent.
- November 16, 1976
The California Angels signed Don Baylor as a free agent.
- November 17, 1976
The Texas Rangers signed Bert Campaneris as a free agent.
The Montreal Expos signed Dave Cash as a free agent.
The Atlanta Braves signed Gary Matthews as a free agent.
The California Angels signed Joe Rudi as a free agent.
- November 18, 1976
The New York Yankees signed Don Gullett as a free agent.
The Baltimore Orioles traded Dave Duncan to the Chicago White Sox for Pat Kelly.
- November 19, 1976
The Milwaukee Brewers signed Sal Bando as a free agent.
The Cleveland Indians signed Wayne Garland as a free agent.
- November 22, 1976
The Boston Red Sox signed Darryl Cias as a free agent.
The San Francisco Giants signed Phil Nastu as an amateur free agent.
- November 23, 1976
The Texas Rangers signed Doyle Alexander as a free agent.
The Houston Astros traded Jerry DaVanon and Larry Dierker to the St. Louis Cardinals for Bob Detherage and Joe Ferguson.
- November 24, 1976
The California Angels signed Bobby Grich as a free agent.
The Chicago White Sox signed Steve Stone as a free agent.
- November 26, 1976
The Chicago White Sox signed Eric Soderholm as a free agent.
The Pittsburgh Pirates signed Gibson Alba as an amateur free agent.
- November 29, 1976
The Houston Astros signed Jim Fuller as a free agent.
The New York Yankees signed Reggie Jackson as a free agent.
- November 30, 1976
The New York Yankees purchased Jim Wynn from the Atlanta Braves.
- December 1, 1976
Tito Fuentes of the San Diego Padres granted free agency.
- December 2, 1976
The Chicago White Sox signed Tim Nordbrook as a free agent.
The Detroit Tigers released Joe Decker.
The Montreal Expos released Clay Kirby.
- December 3, 1976
The California Angels traded Bill Melton to the Cleveland Indians for a player to be named later and cash. The Cleveland Indians sent Stan Perzanowski (March 28, 1977) to the California Angels to complete the trade.
- December 5, 1976
The Chicago White Sox signed Royle Stillman as a free agent.
- December 6, 1976
The Seattle Mariners drafted Charlie Beamon from the Kansas City Royals in the 1976 rule 5 draft.
The Minnesota Twins drafted Rich Chiles from the Houston Astros in the 1976 rule 5 draft.
The Baltimore Orioles drafted Mike Dimmel from the Los Angeles Dodgers in the 1976 rule 5 draft.
The Milwaukee Brewers drafted Marshall Edwards from the Baltimore Orioles in the 1976 rule 5 draft.
The St. Louis Cardinals drafted Roger Freed from the Montreal Expos in the 1976 rule 5 draft.
The Chicago Cubs drafted Willie Hernández from the Philadelphia Phillies in the 1976 rule 5 draft.
The Los Angeles Dodgers drafted Ted Martínez from the Cincinnati Reds in the 1976 rule 5 draft.
The Minnesota Twins drafted Mike Proly from the St. Louis Cardinals in the 1976 rule 5 draft.
The Minnesota Twins purchased Glenn Adams from the San Francisco Giants.
The Milwaukee Brewers purchased Larry Haney from the Oakland Athletics.
The Kansas City Royals purchased Bob Heise from the Boston Red Sox.
The Boston Red Sox traded Cecil Cooper to the Milwaukee Brewers for Bernie Carbo and George Scott.
The Cleveland Indians traded Rick Cerone and John Lowenstein to the Toronto Blue Jays for Rico Carty.
The Kansas City Royals traded a player to be named later, Jamie Quirk and Jim Wohlford to the Milwaukee Brewers for Jim Colborn and Darrell Porter. The Kansas City Royals sent Bob McClure (March 15, 1977) to the Milwaukee Brewers to complete the trade.
- December 7, 1976
The Milwaukee Brewers drafted Jeff Yurak from the San Francisco Giants in the 1976 minor league draft.
The Kansas City Royals traded Frank Ortenzio to the Montreal Expos for Rudy Kinard (minors).
The Pittsburgh Pirates traded Craig Reynolds and Jimmy Sexton to the Seattle Mariners for Grant Jackson.
- December 8, 1976
The Minnesota Twins drafted Mark Souza from the Kansas City Royals in the 1976 rule 5 draft.
The Chicago Cubs traded Julio González to the Houston Astros for Greg Gross.
The Cleveland Indians traded George Hendrick to the San Diego Padres for Johnny Grubb, Fred Kendall and Héctor Torres.
As part of a 3-team trade: The Chicago Cubs sent Pete LaCock to the Kansas City Royals. The New York Mets sent Jim Dwyer to the Chicago Cubs. The Kansas City Royals sent a player to be named later to the New York Mets. The Kansas City Royals sent Sheldon Mallory (December 13, 1976) to the New York Mets to complete the trade.
- December 9, 1976
The Atlanta Braves traded Adrian Devine, Ken Henderson, Dave May, Roger Moret, Carl Morton and $250,000 to the Texas Rangers for Jeff Burroughs.
The New York Mets traded Leon Brown and Brock Pemberton to the St. Louis Cardinals for Ed Kurpiel (minors).
- December 10, 1976
Ed Crosby of the Cleveland Indians granted free agency.
The Cleveland Indians traded Jackie Brown to the Montreal Expos for Andre Thornton.
The Chicago White Sox traded Terry Forster and Rich Gossage to the Pittsburgh Pirates for Silvio Martínez and Richie Zisk.
The San Francisco Giants traded Ken Reitz to the St. Louis Cardinals for Lynn McGlothen.
- December 12, 1976
The Detroit Tigers released Bill Freehan.
- December 13, 1976
The Pittsburgh Pirates signed Steve Farr as an amateur free agent.
The Atlanta Braves purchased Steve Kline from the Cleveland Indians.
The Kansas City Royals released Ken Sanders.
- December 14, 1976
The San Diego Padres signed Rollie Fingers as a free agent.
The San Diego Padres signed Gene Tenace as a free agent.
The Milwaukee Brewers released Ray Sadecki.
- December 15, 1976
The Philadelphia Phillies signed Richie Hebner as a free agent.
The Philadelphia Phillies signed Marty Bystrom as an amateur free agent.
The Texas Rangers released Craig Skok.
The Baltimore Orioles traded Bob Babcock to the Texas Rangers for Dave Criscione.
The Chicago White Sox traded Tony La Russa to the St. Louis Cardinals for Randy Wiles.
- December 16, 1976
The Detroit Tigers released Pedro García.
The Detroit Tigers released Alex Johnson.
The Cincinnati Reds traded Will McEnaney and Tony Pérez to the Montreal Expos for Woodie Fryman and Dale Murray.
- December 17, 1976
The Baltimore Orioles released Tommy Harper.
The New York Yankees released César Tovar.
- December 20, 1976
The Los Angeles Dodgers traded Ted Sizemore to the Philadelphia Phillies for a player to be named later and Johnny Oates. The Philadelphia Phillies sent Quency Hill (minors) (January 4, 1977) to the Los Angeles Dodgers to complete the trade.
- December 21, 1976
The Baltimore Orioles released Mike Cuellar.
- December 25, 1976
The Texas Rangers signed Len Whitehouse as an amateur free agent.
- December 26, 1976
The New York Mets signed Scott Holman as an amateur free agent.
- Before 1977 Season
The Toronto Blue Jays signed Lloyd Allen as a free agent.
The Texas Rangers released Joe Hoerner.
The San Diego Padres released Jim Shellenback.
Junior Kennedy sent from the Cincinnati Reds to the San Francisco Giants in an unknown transaction.
Milt Ramírez sent from the Kansas City Royals to the Oakland Athletics in an unknown transaction.
- January 3, 1977
The Toronto Blue Jays signed Pedro García as a free agent.
The Kansas City Royals released Lindy McDaniel.
- January 4, 1977
The Milwaukee Brewers signed Ken Sanders as a free agent.
The Boston Red Sox traded Dave Machemer to the California Angels for John Doherty.
- January 5, 1977
The Toronto Blue Jays traded a player to be named later to the Chicago White Sox for Phil Roof. The Toronto Blue Jays sent Larry Anderson (January 5, 1977) to the Chicago White Sox to complete the trade.
- January 6, 1977
The San Francisco Giants signed Willie McCovey as a free agent.
- January 8, 1977
The Seattle Mariners signed Byron McLaughlin as a free agent.
- January 9, 1977
The Oakland Athletics signed Craig Minetto as a free agent.
- January 11, 1977
The Chicago Cubs traded Mike Garman and Rick Monday to the Los Angeles Dodgers for Jeff Albert (minors), Bill Buckner and Iván de Jesús.
The Cincinnati Reds drafted Bill Scherrer in the 1st round (1st pick) of the 1977 amateur draft (January Secondary).
The Oakland Athletics drafted Hubie Brooks in the 1st round (2nd pick) of the 1977 amateur draft (January Secondary), but was not signed.
The Houston Astros drafted John Butcher in the 1st round (5th pick) of the 1977 amateur draft (January Secondary), but was not signed.
The California Angels drafted Alan Wiggins in the 1st round (8th pick) of the 1977 amateur draft (January).
The Detroit Tigers drafted Mike Chris in the 1st round (10th pick) of the 1977 amateur draft (January Secondary).
The Texas Rangers drafted Dave Righetti in the 1st round (10th pick) of the 1977 amateur draft (January).
The New York Yankees drafted Willie McGee in the 1st round (15th pick) of the 1977 amateur draft (January Secondary). Player signed June 6, 1977.
The Baltimore Orioles drafted John Shelby in the 1st round (20th pick) of the 1977 amateur draft (January).
The Minnesota Twins drafted Mike Walters in the 1st round (21st pick) of the 1977 amateur draft (January Secondary), but was not signed.
The California Angels drafted Daryl Sconiers in the 3rd round of the 1977 amateur draft (January).
The San Francisco Giants drafted Bud Black in the 3rd round of the 1977 amateur draft (January), but was not signed.
The Chicago Cubs drafted Jim Tracy in the 4th round of the 1977 amateur draft (January).
The St. Louis Cardinals drafted Ty Waller in the 4th round of the 1977 amateur draft (January). Player signed May 11, 1977.
The Chicago White Sox drafted Charlie Lea in the 4th round of the 1977 amateur draft (January Secondary), but was not signed.
The Montreal Expos drafted Dan Firova in the 7th round of the 1977 amateur draft (January), but was not signed.
The San Francisco Giants drafted Jeff Lahti in the 7th round of the 1977 amateur draft (January), but was not signed.
The Minnesota Twins drafted Brad Lesley in the 7th round of the 1977 amateur draft (January), but was not signed.
The St. Louis Cardinals drafted Jesse Orosco in the 7th round of the 1977 amateur draft (January), but was not signed.
The Chicago White Sox drafted Mark Esser in the 8th round of the 1977 amateur draft (January).
The California Angels drafted Marty Castillo in the 8th round of the 1977 amateur draft (January), but was not signed.
The Detroit Tigers drafted Bill Laskey in the 8th round of the 1977 amateur draft (January), but was not signed.
The San Francisco Giants drafted Jay Pettibone in the 8th round of the 1977 amateur draft (January), but was not signed.
The California Angels drafted Marty Barrett in the 11th round of the 1977 amateur draft (January), but was not signed.
The Cincinnati Reds drafted Bob Dernier in the 12th round of the 1977 amateur draft (January), but was not signed.
The Minnesota Twins drafted Brad Mills in the 16th round of the 1977 amateur draft (January), but was not signed.
- January 12, 1977
The Houston Astros traded Skip Jutze to the Seattle Mariners for Alan Griffin (minors) and cash.
- January 17, 1977
The Pittsburgh Pirates signed Eddie Vargas as an amateur free agent.
The Kansas City Royals released Tommy Davis.
The Chicago Cubs released Geoff Zahn.
- January 18, 1977
The Pittsburgh Pirates signed Junior Ortiz as an amateur free agent.
- January 20, 1977
The Baltimore Orioles traded Paul Blair to the New York Yankees for Rick Bladt and Elliott Maddox.
- January 22, 1977
The San Diego Padres released Willie Davis.
- January 24, 1977
The Minnesota Twins signed Ray Smith as an amateur free agent.
- January 25, 1977
The California Angels signed Mike Cuellar as a free agent.
The Houston Astros traded Paul Siebert to the San Diego Padres for Mike Allen (minors).
- January 26, 1977
The Chicago White Sox released Blue Moon Odom.
- January 31, 1977
The Oakland Athletics signed Ed Crosby as a free agent.
- February 2, 1977
The Texas Rangers released Fritz Peterson.
- February 3, 1977
The Philadelphia Phillies signed Davey Johnson as a free agent.
- February 5, 1977
The Chicago Cubs traded Darold Knowles to the Texas Rangers for a player to be named later and cash. The Texas Rangers sent Gene Clines (February 15, 1977) to the Chicago Cubs to complete the trade.
- February 7, 1977
The Los Angeles Dodgers traded Rick Auerbach to the New York Mets for Richard Sander (minors) and Hank Webb.
- February 8, 1977
The Baltimore Orioles signed Billy Smith as a free agent.
- February 9, 1977
The Montreal Expos released Wayne Granger.
- February 10, 1977
The Cleveland Indians signed Paul Dade as a free agent.
The Cincinnati Reds signed Les Straker as an amateur free agent.
- February 11, 1977
The Baltimore Orioles signed Victor Rodriguez as an amateur free agent.
The Chicago Cubs traded Bill Madlock and Rob Sperring to the San Francisco Giants for Andrew Muhlstock (minors), Bobby Murcer and Steve Ontiveros.
- February 13, 1977
The Cincinnati Reds signed Steve Christmas as an amateur free agent.
- February 14, 1977
The Cleveland Indians signed Greg Wells as a free agent.
- February 15, 1977
The Chicago White Sox signed Fritz Peterson as a free agent.
- February 16, 1977
The San Diego Padres traded Jerry Johnson to the Toronto Blue Jays for Dave Roberts.
The Chicago Cubs traded Champ Summers to the Cincinnati Reds for Dave Schneck.
- February 17, 1977
The Milwaukee Brewers released Gary Sutherland.
The New York Yankees traded Sandy Alomar to the Texas Rangers for Brian Doyle, Greg Pryor and cash.
- February 18, 1977
The New York Yankees signed José Uribe as an amateur free agent.
The San Francisco Giants released Chris Arnold.
- February 19, 1977
The Texas Rangers purchased Paul Lindblad from the Oakland Athletics for $400,000.
- February 23, 1977
The Detroit Tigers signed Tito Fuentes as a free agent.
- February 24, 1977
The Atlanta Braves signed Wayne Granger as a free agent.
The Oakland Athletics traded Ron Fairly to the Toronto Blue Jays for Mike Weathers (minors) and cash.
- February 25, 1977
The New York Mets purchased Luis Alvarado from the Detroit Tigers.
The Milwaukee Brewers purchased Ken McMullen from the Oakland Athletics.
- February 27, 1977
The Pittsburgh Pirates signed Jim Nettles as a free agent.
- February 28, 1977
The Chicago Cubs traded Buddy Schultz to the St. Louis Cardinals for Mark Covert (minors).
- March 2, 1977
The Baltimore Orioles signed Ed Farmer as a free agent.
- March 7, 1977
The Texas Rangers released Joe Lahoud.
- March 14, 1977
The New York Yankees traded Terry Whitfield to the San Francisco Giants for Marty Perez.
- March 15, 1977
The Oakland Athletics purchased Jerry Tabb from the Chicago Cubs.
The Chicago Cubs traded Joe Coleman to the Oakland Athletics for Jim Todd.
The Oakland Athletics traded Chris Batton, Phil Garner and Tommy Helms to the Pittsburgh Pirates for Tony Armas, Doug Bair, Dave Giusti, Rick Langford, Doc Medich and Mitchell Page.
The Montreal Expos traded Rodney Scott to the Texas Rangers for Jeff Terpko.
The Chicago Cubs traded Jim Tyrone to the Oakland Athletics for Gaylen Pitts.
- March 16, 1977
The Oakland Athletics signed Dick Allen as a free agent.
- March 17, 1977
The Montreal Expos signed Rick Engle as an amateur free agent.
- March 18, 1977
The Minnesota Twins signed Geoff Zahn as a free agent.
- March 20, 1977
The Chicago Cubs signed Joe Decker as a free agent.
- March 21, 1977
The Milwaukee Brewers purchased Steve Brye from the Minnesota Twins.
- March 22, 1977
The Kansas City Royals signed Joe Lahoud as a free agent.
The Toronto Blue Jays purchased Ken Reynolds from the San Diego Padres.
- March 23, 1977
The Chicago White Sox traded Clay Carroll to the St. Louis Cardinals for Lerrin LaGrow.
The Milwaukee Brewers selected Rich Folkers off waivers from the San Diego Padres.
- March 24, 1977
The St. Louis Cardinals released Tom Walker.
The Cleveland Indians released Greg Wells.
- March 26, 1977
The San Francisco Giants signed Chris Bourjos as an amateur free agent.
The St. Louis Cardinals purchased Tommy Sandt from the Oakland Athletics.
The Seattle Mariners released Kurt Bevacqua.
The Baltimore Orioles released Terry Crowley.
The Seattle Mariners released Jim Minshall.
The Boston Red Sox released Rico Petrocelli.
The Houston Astros traded Rob Andrews and cash to the San Francisco Giants for Willie Crawford and Rob Sperring.
The New York Yankees traded Kerry Dineen to the Philadelphia Phillies for Sergio Ferrer.
The Oakland Athletics traded Claudell Washington to the Texas Rangers for Rodney Scott, Jim Umbarger and cash.
- March 28, 1977
The Atlanta Braves signed Bob Johnson as a free agent.
The Oakland Athletics released Ed Crosby.
The Detroit Tigers released Marv Lane.
The Chicago White Sox released Tim Stoddard.
The Montreal Expos released Earl Williams.
The Chicago White Sox released Jim York.
The Cincinnati Reds traded Joel Youngblood to the St. Louis Cardinals for Bill Caudill.
- March 29, 1977
The Oakland Athletics purchased Pablo Torrealba from the Atlanta Braves.
The Toronto Blue Jays released Lloyd Allen.
The Oakland Athletics released Dick Bosman.
The San Diego Padres released Alan Foster.
The Atlanta Braves released Wayne Granger.
The St. Louis Cardinals released Roric Harrison.
The Toronto Blue Jays released Leon Hooten.
The Toronto Blue Jays released Doug Howard.
The Cincinnati Reds traded Pat Darcy to the St. Louis Cardinals for Mike Caldwell.
The Cleveland Indians traded Héctor Torres to the Toronto Blue Jays for John Lowenstein.
- March 30, 1977
The Atlanta Braves released Bruce Dal Canton.
The Chicago White Sox released Dave Duncan.
The Montreal Expos released Bill Greif.
The Cleveland Indians released Boog Powell.
The Minnesota Twins released Mark Wiley.
The New York Mets traded Benny Ayala to the St. Louis Cardinals for Doug Clarey.
The Houston Astros traded Larry Milbourne to the Seattle Mariners for Roy Thomas.
- March 31, 1977
The New York Mets signed Ray Sadecki as a free agent.
The San Francisco Giants purchased Ken Rudolph from the St. Louis Cardinals.
The Minnesota Twins purchased Ron Schueler from the Philadelphia Phillies.
The Toronto Blue Jays released Ken Reynolds.
The Pittsburgh Pirates released Bob Robertson.
- April 1, 1977
The San Diego Padres signed Gary Sutherland as a free agent.
The Seattle Mariners loaned Byron McLaughlin to Nuevo Laredo (Mexican).
The Seattle Mariners purchased Mike Kekich from Nuevo Laredo (Mexican).
The Seattle Mariners purchased Enrique Romo from Mexico City Reds (Mexican).
The Atlanta Braves released Steve Kline.
The Texas Rangers released Carl Morton.
The Pittsburgh Pirates released Willie Royster.
- April 3, 1977
The Oakland Athletics signed Earl Williams as a free agent.
The Chicago White Sox purchased Tommy Cruz from the Texas Rangers.
- April 4, 1977
The Chicago White Sox signed Bruce Dal Canton as a free agent.
The Oakland Athletics purchased Sheldon Mallory from the New York Mets.
The California Angels traded Mike Easler to the Pittsburgh Pirates for Randy Sealy (minors).
- April 5, 1977
The Detroit Tigers signed Roric Harrison as a free agent.
The Los Angeles Dodgers signed Boog Powell as a free agent.
The Boston Red Sox released Darryl Cias.
The Los Angeles Dodgers released Keith MacWhorter.
The Chicago White Sox traded Bucky Dent to the New York Yankees for Bob Polinsky (minors), Oscar Gamble, LaMarr Hoyt and $200,000.
- April 6, 1977
The Minnesota Twins purchased Don Carrithers from the Montreal Expos.
The San Francisco Giants released Reggie Walton.
- April 7, 1977
The Chicago White Sox signed Jim Bouton as a free agent.
The Boston Red Sox released Mark Bomback.
- April 8, 1977
The Texas Rangers signed Kurt Bevacqua as a free agent.
The Baltimore Orioles signed Tim Stoddard as a free agent.
- April 9, 1977
The Minnesota Twins released Jim Obradovich.
The Houston Astros signed Jim Obradovich as a free agent.
- April 10, 1977
The Montreal Expos signed Tom Walker as a free agent.
- April 12, 1977
The Baltimore Orioles signed Terry Crowley as a free agent.
The San Diego Padres signed Mark Wiley as a free agent.
The Detroit Tigers traded Willie Horton to the Texas Rangers for Steve Foucault.
- April 14, 1977
The Toronto Blue Jays signed Paul Hodgson as an amateur free agent.
- April 20, 1977
The Seattle Mariners traded Pete Broberg to the Chicago Cubs for a player to be named later. The Chicago Cubs sent Jim Todd (October 25, 1977) to the Seattle Mariners to complete the trade.
- April 26, 1977
The New York Mets traded a player to be named later and cash to the Texas Rangers for Lenny Randle. The New York Mets sent Rick Auerbach (May 20, 1977) to the Texas Rangers to complete the trade.
- April 27, 1977
The Cincinnati Reds signed Joe Hoerner as a free agent.
The New York Mets returned Luis Alvarado to the Detroit Tigers following previous purchase.
The New York Yankees traded Dock Ellis, Larry Murray and Marty Perez to the Oakland Athletics for Mike Torrez.
The Montreal Expos traded Tim Foli to the San Francisco Giants for Chris Speier.
- April 30, 1977
The Texas Rangers purchased Mike Marshall from the Atlanta Braves.
- May, 1977
The Philadelphia Phillies signed Carl Morton as a free agent. (Date given is approximate. Exact date is uncertain.)
- May 2, 1977
The Houston Astros signed Bert Peña as an amateur free agent.
The Minnesota Twins purchased Dave Johnson from the Seattle Mariners.
The Los Angeles Dodgers released Ellie Rodríguez.
The New York Mets released Ray Sadecki.
- May 7, 1977
The Milwaukee Brewers signed Mark Bomback as a free agent.
- May 9, 1977
The Texas Rangers traded Roy Howell to the Toronto Blue Jays for Steve Hargan, Jim Mason and $200,000.
- May 11, 1977
The St. Louis Cardinals released Jerry DaVanon.
The California Angels traded Bruce Bochte, Sid Monge and $250,000 to the Cleveland Indians for Dave LaRoche and Dave Schuler.
- May 15, 1977
The Seattle Mariners signed Tom Brown as a free agent.
- May 16, 1977
The Philadelphia Phillies signed Jay Loviglio as an amateur free agent.
The California Angels released Mike Cuellar.
- May 17, 1977
The San Diego Padres traded Butch Metzger to the St. Louis Cardinals for John D'Acquisto and Pat Scanlon.
- May 19, 1977
The San Francisco Giants signed DeWayne Buice as an amateur free agent.
- May 20, 1977
The Seattle Mariners signed Rod Craig as an amateur free agent.
- May 21, 1977
The Cincinnati Reds traded Santo Alcalá to the Montreal Expos for players to be named later. The Montreal Expos sent Shane Rawley (May 27, 1977) and Ángel Torres (May 27, 1977) to the Cincinnati Reds to complete the trade.
- May 22, 1977
The Baltimore Orioles signed Dave Huppert as an amateur free agent.
The Montreal Expos traded Mike Jorgensen to the Oakland Athletics for Stan Bahnsen.
- May 23, 1977
The Chicago Cubs signed Carlos Lezcano as an amateur free agent.
The New York Yankees purchased Dave Moates from the Texas Rangers.
- May 24, 1977
The Atlanta Braves traded Mike Beard to the St. Louis Cardinals for Eddie Solomon.
- May 25, 1977
The Chicago Cubs released Tim Ireland.
The Philadelphia Phillies released Bobby Tolan.
- May 26, 1977
Randy Stein sent from the Baltimore Orioles to the New York Yankees in an unknown transaction.
- May 27, 1977
The Kansas City Royals signed Tim Ireland as a free agent.
- May 28, 1977
The Atlanta Braves signed Terry Leach as a free agent.
The Seattle Mariners purchased Tom House from the Boston Red Sox.
The Boston Red Sox traded Bobby Darwin to the Chicago Cubs for Ramón Hernández.
- June, 1977
The Atlanta Braves signed Steve Kline as a free agent. (Date given is approximate. Exact date is uncertain.)
- June 1, 1977
The Chicago White Sox released Jim Bouton.
- June 7, 1977
The Atlanta Braves released Bob Johnson.
The Chicago White Sox drafted Harold Baines in the 1st round (1st pick) of the 1977 amateur draft.
The Montreal Expos drafted Bill Gullickson in the 1st round (2nd pick) of the 1977 amateur draft.
The Milwaukee Brewers drafted Paul Molitor in the 1st round (3rd pick) of the 1977 amateur draft. Player signed June 24, 1977.
The Chicago White Sox drafted Hubie Brooks in the 1st round (3rd pick) of the 1977 amateur draft (June Secondary), but was not signed.
The St. Louis Cardinals drafted Terry Kennedy in the 1st round (6th pick) of the 1977 amateur draft.
The California Angels drafted Richard Dotson in the 1st round (7th pick) of the 1977 amateur draft.
The San Diego Padres drafted Brian Greer in the 1st round (8th pick) of the 1977 amateur draft.
The Chicago Cubs drafted Randy Martz in the 1st round (12th pick) of the 1977 amateur draft. Player signed June 20, 1977.
The Houston Astros drafted Ricky Adams in the 1st round (14th pick) of the 1977 amateur draft.
The New York Mets drafted Wally Backman in the 1st round (16th pick) of the 1977 amateur draft.
The Los Angeles Dodgers drafted Ron Roenicke in the 1st round (17th pick) of the 1977 amateur draft (June Secondary). Player signed June 10, 1977.
The Texas Rangers drafted John Butcher in the 1st round (18th pick) of the 1977 amateur draft (June Secondary).
The Baltimore Orioles drafted Drungo Hazewood in the 1st round (19th pick) of the 1977 amateur draft.
The California Angels drafted Mike Walters in the 1st round (20th pick) of the 1977 amateur draft (June Secondary).
The Los Angeles Dodgers drafted Bob Welch in the 1st round (20th pick) of the 1977 amateur draft.
The Kansas City Royals drafted Mike Jones in the 1st round (21st pick) of the 1977 amateur draft.
The Philadelphia Phillies drafted Scott Munninghoff in the 1st round (22nd pick) of the 1977 amateur draft.
The Detroit Tigers drafted Bill Laskey in the 1st round (24th pick) of the 1977 amateur draft (June Secondary), but was not signed.
The Seattle Mariners drafted Dave Henderson in the 1st round (26th pick) of the 1977 amateur draft.
The Chicago White Sox drafted Rich Barnes in the 2nd round of the 1977 amateur draft.
The Milwaukee Brewers drafted Kevin Bass in the 2nd round of the 1977 amateur draft.
The Los Angeles Dodgers drafted Joe Beckwith in the 2nd round of the 1977 amateur draft.
The Atlanta Braves drafted Tony Brizzolara in the 2nd round of the 1977 amateur draft.
The San Diego Padres drafted Barry Evans in the 2nd round of the 1977 amateur draft.
The San Francisco Giants drafted Phil Huffman in the 2nd round of the 1977 amateur draft.
The Boston Red Sox drafted Bobby Sprowl in the 2nd round of the 1977 amateur draft.
The New York Mets drafted Mookie Wilson in the 2nd round of the 1977 amateur draft.
The New York Mets drafted Bud Black in the 2nd round of the 1977 amateur draft (June Secondary), but was not signed.
The Oakland Athletics drafted Keith Creel in the 2nd round of the 1977 amateur draft, but was not signed.
The Chicago Cubs drafted Terry Francona in the 2nd round of the 1977 amateur draft, but was not signed.
The San Francisco Giants drafted Dave Hostetler in the 2nd round of the 1977 amateur draft (June Secondary), but was not signed.
The New York Yankees drafted Jack Lazorko in the 2nd round of the 1977 amateur draft (June Secondary), but was not signed.
The St. Louis Cardinals drafted Ricky Wright in the 2nd round of the 1977 amateur draft, but was not signed.
The Seattle Mariners drafted Bud Anderson in the 3rd round of the 1977 amateur draft.
The Detroit Tigers drafted Darrell Brown in the 3rd round of the 1977 amateur draft.
The Oakland Athletics drafted Mike Davis in the 3rd round of the 1977 amateur draft.
The St. Louis Cardinals drafted Joe DeSa in the 3rd round of the 1977 amateur draft.
The Minnesota Twins drafted Roger Erickson in the 3rd round of the 1977 amateur draft.
The New York Yankees drafted Joe Lefebvre in the 3rd round of the 1977 amateur draft. Player signed July 6, 1977.
The Atlanta Braves drafted Bob Porter in the 3rd round of the 1977 amateur draft.
The Montreal Expos drafted Scott Sanderson in the 3rd round of the 1977 amateur draft.
The Pittsburgh Pirates drafted Stew Cliburn in the 4th round of the 1977 amateur draft.
The St. Louis Cardinals drafted Jim Gott in the 4th round of the 1977 amateur draft.
The California Angels drafted Brian Harper in the 4th round of the 1977 amateur draft.
The New York Yankees drafted Roger Holt in the 4th round of the 1977 amateur draft.
The Cincinnati Reds drafted Joe Price in the 4th round of the 1977 amateur draft.
The Chicago Cubs drafted Dan Rohn in the 4th round of the 1977 amateur draft. Player signed June 9, 1977.
The San Diego Padres drafted Ozzie Smith in the 4th round of the 1977 amateur draft.
The Philadelphia Phillies drafted George Vukovich in the 4th round of the 1977 amateur draft. Player signed June 21, 1977.
The Texas Rangers drafted George Wright in the 4th round of the 1977 amateur draft.
The Los Angeles Dodgers drafted Mickey Hatcher in the 5th round of the 1977 amateur draft.
The Houston Astros drafted Scott Loucks in the 5th round of the 1977 amateur draft.
The Chicago Cubs drafted Steve Macko in the 5th round of the 1977 amateur draft. Player signed June 17, 1977.
The New York Mets drafted Freddie Martínez in the 5th round of the 1977 amateur draft.
The Seattle Mariners drafted Ron Musselman in the 5th round of the 1977 amateur draft.
The Montreal Expos drafted Tim Raines in the 5th round of the 1977 amateur draft.
The St. Louis Cardinals drafted Andy Rincon in the 5th round of the 1977 amateur draft.
The California Angels drafted Rick Steirer in the 5th round of the 1977 amateur draft.
The Minnesota Twins drafted Rich Bordi in the 5th round of the 1977 amateur draft, but was not signed.
The Cleveland Indians drafted Tim Lollar in the 5th round of the 1977 amateur draft, but was not signed.
The Chicago White Sox drafted Rod Allen in the 6th round of the 1977 amateur draft.
The Oakland Athletics drafted Dave Beard in the 6th round of the 1977 amateur draft.
The St. Louis Cardinals drafted Jeff Doyle in the 6th round of the 1977 amateur draft.
The New York Mets drafted Brent Gaff in the 6th round of the 1977 amateur draft.
The Atlanta Braves drafted Albert Hall in the 6th round of the 1977 amateur draft.
The Cleveland Indians drafted Eric Wilkins in the 6th round of the 1977 amateur draft.
The Texas Rangers drafted Odie Davis in the 7th round of the 1977 amateur draft.
The Cincinnati Reds drafted Tom Foley in the 7th round of the 1977 amateur draft. Player signed June 11, 1977.
The Kansas City Royals drafted Kelly Heath in the 7th round of the 1977 amateur draft.
The Los Angeles Dodgers drafted Bobby Mitchell in the 7th round of the 1977 amateur draft.
The Detroit Tigers drafted Rick Peters in the 7th round of the 1977 amateur draft.
The California Angels drafted Brad Havens in the 8th round of the 1977 amateur draft.
The Boston Red Sox drafted Roger LaFrancois in the 8th round of the 1977 amateur draft.
The Toronto Blue Jays drafted Jesse Barfield in the 9th round of the 1977 amateur draft.
The Minnesota Twins drafted Darrell Jackson in the 9th round of the 1977 amateur draft.
The Texas Rangers drafted Bob Johnson in the 9th round of the 1977 amateur draft.
The Baltimore Orioles drafted Mark Smith in the 9th round of the 1977 amateur draft.
The Kansas City Royals drafted Bobby Bonner in the 9th round of the 1977 amateur draft, but was not signed.
The Milwaukee Brewers drafted Dave LaPoint in the 10th round of the 1977 amateur draft.
The Boston Red Sox drafted Steve Shields in the 10th round of the 1977 amateur draft.
The San Diego Padres drafted Ron Tingley in the 10th round of the 1977 amateur draft.
The New York Yankees drafted Chuck Hensley in the 10th round of the 1977 amateur draft, but was not signed.
The San Francisco Giants drafted Chili Davis in the 11th round of the 1977 amateur draft. Player signed September 3, 1977.
The Chicago White Sox drafted Rusty Kuntz in the 11th round of the 1977 amateur draft.
The Pittsburgh Pirates drafted Rick Lancellotti in the 11th round of the 1977 amateur draft.
The Kansas City Royals drafted Bill Earley in the 11th round of the 1977 amateur draft, but was not signed.
The Seattle Mariners drafted Bill Latham in the 11th round of the 1977 amateur draft, but was not signed.
The Seattle Mariners drafted Karl Best in the 12th round of the 1977 amateur draft.
The San Francisco Giants drafted Bob Tufts in the 12th round of the 1977 amateur draft.
The Pittsburgh Pirates drafted Wayne Tolleson in the 12th round of the 1977 amateur draft, but was not signed.
The Oakland Athletics drafted Jeff Jones in the 13th round of the 1977 amateur draft.
The Texas Rangers drafted Don Kainer in the 13th round of the 1977 amateur draft.
The San Francisco Giants drafted Bob Kearney in the 14th round of the 1977 amateur draft.
The Cleveland Indians drafted Kevin Rhomberg in the 14th round of the 1977 amateur draft.
The Detroit Tigers drafted Bruce Robbins in the 14th round of the 1977 amateur draft.
The Houston Astros drafted Billy Smith in the 14th round of the 1977 amateur draft.
The California Angels drafted Brian Denman in the 14th round of the 1977 amateur draft, but was not signed.
The Toronto Blue Jays drafted Danny Ainge in the 15th round of the 1977 amateur draft.
The Cleveland Indians drafted Jerry Dybzinski in the 15th round of the 1977 amateur draft.
The San Francisco Giants drafted Jim Farr in the 15th round of the 1977 amateur draft, but was not signed.
The Baltimore Orioles drafted Mike Martin in the 15th round of the 1977 amateur draft, but was not signed.
The Seattle Mariners drafted Tony Phillips in the 16th round of the 1977 amateur draft, but was not signed.
The Atlanta Braves drafted Larry Owen in the 17th round of the 1977 amateur draft.
The Chicago White Sox drafted Terry Bogener in the 17th round of the 1977 amateur draft, but was not signed.
The Boston Red Sox drafted Gary Redus in the 17th round of the 1977 amateur draft, but was not signed.
The Minnesota Twins drafted Scott Ullger in the 18th round of the 1977 amateur draft.
The Milwaukee Brewers drafted Dave Hudgens in the 18th round of the 1977 amateur draft, but was not signed.
The Detroit Tigers drafted Willie Lozado in the 18th round of the 1977 amateur draft, but was not signed.
The Pittsburgh Pirates drafted Dennis Rasmussen in the 18th round of the 1977 amateur draft, but was not signed.
The Kansas City Royals drafted Renie Martin in the 19th round of the 1977 amateur draft. Player signed June 15, 1977.
The Chicago White Sox drafted Dewey Robinson in the 19th round of the 1977 amateur draft.
The New York Mets drafted Craig Chamberlain in the 19th round of the 1977 amateur draft, but was not signed.
The Chicago White Sox drafted Ross Baumgarten in the 20th round of the 1977 amateur draft.
The Philadelphia Phillies drafted Greg Walker in the 20th round of the 1977 amateur draft. Player signed June 11, 1977.
The Atlanta Braves drafted Mike Brown in the 20th round of the 1977 amateur draft, but was not signed.
The San Francisco Giants drafted Ricky Horton in the 20th round of the 1977 amateur draft, but was not signed.
The New York Yankees drafted Chris Welsh in the 21st round of the 1977 amateur draft.
The Texas Rangers drafted Ed Lynch in the 22nd round of the 1977 amateur draft.
The Philadelphia Phillies drafted Jerry Reed in the 22nd round of the 1977 amateur draft. Player signed June 9, 1977.
The Milwaukee Brewers drafted Chris Bando in the 22nd round of the 1977 amateur draft, but was not signed.
The Boston Red Sox drafted Gerry Davis in the 22nd round of the 1977 amateur draft, but was not signed.
The Los Angeles Dodgers drafted Mitch Webster in the 23rd round of the 1977 amateur draft.
The St. Louis Cardinals drafted Floyd Chiffer in the 23rd round of the 1977 amateur draft, but was not signed.
The Baltimore Orioles drafted Chris Jones in the 23rd round of the 1977 amateur draft, but was not signed.
The San Diego Padres drafted Gary Weiss in the 23rd round of the 1977 amateur draft, but was not signed.
The New York Yankees drafted Juan Bonilla in 1977, but pick was voided.
The Oakland Athletics drafted Shooty Babitt in the 25th round of the 1977 amateur draft.
The Boston Red Sox drafted Pete Ladd in the 25th round of the 1977 amateur draft.
The Boston Red Sox drafted Lee Graham in the 26th round of the 1977 amateur draft.
The Montreal Expos drafted Tony Johnson in the 26th round of the 1977 amateur draft.
The Philadelphia Phillies drafted Jim Adduci in the 28th round of the 1977 amateur draft, but was not signed.
The Chicago Cubs drafted Gene Krug in the 29th round of the 1977 amateur draft. Player signed June 18, 1977.
The St. Louis Cardinals drafted Mike Jeffcoat in the 30th round of the 1977 amateur draft, but was not signed.
The California Angels drafted Dave Meier in the 31st round of the 1977 amateur draft, but was not signed.
The St. Louis Cardinals drafted Neil Fiala in the 32nd round of the 1977 amateur draft.
The California Angels drafted La Schelle Tarver in the 32nd round of the 1977 amateur draft, but was not signed.
The Los Angeles Dodgers drafted Tom Niedenfuer in the 36th round of the 1977 amateur draft, but was not signed.
- June 8, 1977
The Toronto Blue Jays purchased Doug Rader from the San Diego Padres.
- June 10, 1977
The Pittsburgh Pirates signed Bobby Tolan as a free agent.
- June 13, 1977
The Pittsburgh Pirates purchased Jerry Hairston from the Chicago White Sox.
The Baltimore Orioles traded Dyar Miller to the California Angels for Dick Drago.
- June 14, 1977
The New York Mets signed Jeff Reardon as an amateur free agent.
The Pittsburgh Pirates released Tommy Helms.
The Kansas City Royals released Tom Hall.
The Minnesota Twins signed Tom Hall as a free agent.
- June 15, 1977
The Cincinnati Reds purchased Rick Auerbach from the Texas Rangers.
The Texas Rangers purchased Dock Ellis from the Oakland Athletics.
The Atlanta Braves purchased Steve Hargan from the Texas Rangers.
The California Angels traded Craig Hendrickson (minors) to the Cincinnati Reds for Gary Nolan.
The Cincinnati Reds traded Mike Caldwell to the Milwaukee Brewers for Rick O'Keeffe (minors) and Garry Pyka (minors).
The Houston Astros traded Willie Crawford to the Oakland Athletics for Denny Walling and cash.
The Cincinnati Reds traded Rawly Eastwick to the St. Louis Cardinals for Doug Capilla.
The Montreal Expos traded Barry Foote and Dan Warthen to the Philadelphia Phillies for Tim Blackwell and Wayne Twitchell.
The Houston Astros traded Cliff Johnson to the New York Yankees for a player to be named later, Mike Fischlin and Randy Niemann. The New York Yankees sent Dave Bergman (November 23, 1977) to the Houston Astros to complete the trade.
The New York Mets traded Dave Kingman to the San Diego Padres for Paul Siebert and Bobby Valentine.
The Pittsburgh Pirates traded Ed Kirkpatrick to the Texas Rangers for Jim Fregosi.
The California Angels traded John Flannery, Don Kirkwood and John Verhoeven to the Chicago White Sox for Ken Brett.
The New York Mets traded Mike Phillips to the St. Louis Cardinals for Joel Youngblood.
The Philadelphia Phillies traded Rick Bosetti, Dane Iorg and Tom Underwood to the St. Louis Cardinals for Bake McBride and Steve Waterbury.
The Cincinnati Reds traded Doug Flynn, Steve Henderson, Dan Norman and Pat Zachry to the New York Mets for Tom Seaver.
- June 16, 1977
The San Francisco Giants signed Tom Runnells as an amateur free agent.
The Los Angeles Dodgers purchased Bobby Castillo from the Kansas City Royals.
- June 17, 1977
The Toronto Blue Jays signed Greg Wells as a free agent.
- June 18, 1977
The New York Mets released Joe Torre.
- June 20, 1977
The California Angels signed Steve Lubratich as an amateur free agent.
- June 21, 1977
The Boston Red Sox signed Tommy Helms as a free agent.
The Boston Red Sox released Doug Griffin.
- June 22, 1977
The Seattle Mariners signed Jim Lewis as an amateur free agent.
The Montreal Expos signed Joe Pettini as an amateur free agent.
The Detroit Tigers released Luis Alvarado.
- June 25, 1977
The Chicago White Sox signed Chris Nyman as an amateur free agent.
- June 27, 1977
The Toronto Blue Jays released Pedro García.
- July 4, 1977
The Chicago Cubs released Joe Decker.
- July 5, 1977
The San Diego Padres signed Pedro García as a free agent.
The Los Angeles Dodgers signed Ron Kittle as an amateur free agent.
The New York Yankees released José Uribe.
- July 11, 1977
The Milwaukee Brewers signed Frank DiPino as an amateur free agent.
- July 13, 1977
The California Angels selected Tom Walker off waivers from the Montreal Expos.
- July 14, 1977
The New York Yankees released Jim Wynn.
The Baltimore Orioles traded Fred Holdsworth to the Montreal Expos for a player to be named later. The Montreal Expos sent Dennis Blair (September 6, 1977) to the Baltimore Orioles to complete the trade.
- July 15, 1977
The Milwaukee Brewers released Mike Hegan.
- July 21, 1977
The Los Angeles Dodgers released Al Downing.
- July 26, 1977
The Milwaukee Brewers signed Jim Wynn as a free agent.
The Atlanta Braves released Steve Kline.
- July 27, 1977
The Toronto Blue Jays purchased Tom Murphy from the Boston Red Sox.
The Baltimore Orioles purchased Ken Rudolph from the San Francisco Giants.
The Seattle Mariners traded Dave Pagan to the Pittsburgh Pirates for a player to be named later. The Pittsburgh Pirates sent Rick Honeycutt (August 22, 1977) to the Seattle Mariners to complete the trade.
- July 30, 1977
The Chicago Cubs purchased Dave Roberts from the Detroit Tigers.
- August, 1977
The Minnesota Twins signed Jim Shellenback as a free agent.
- August 2, 1977
The Seattle Mariners sent Stan Thomas to the New York Yankees as part of a conditional deal.
- August 4, 1977
The Seattle Mariners purchased Paul Mitchell from the Oakland Athletics.
- August 5, 1977
The Philadelphia Phillies signed Bob Dernier as an amateur free agent.
The Boston Red Sox signed Rich Gedman as an amateur free agent.
The Chicago Cubs purchased Dave Giusti from the Oakland Athletics.
- August 11, 1977
The San Francisco Giants signed Gorman Heimueller as an amateur free agent.
- August 12, 1977
The Oakland Athletics traded Randy Scarbery to the St. Louis Cardinals for Steve Dunning.
- August 16, 1977
The California Angels released Stan Perzanowski.
- August 17, 1977
The Los Angeles Dodgers purchased Vic Davalillo from Aguascalientes (Mexican).
- August 18, 1977
The Pittsburgh Pirates signed Doug Frobel as an amateur free agent.
The Chicago White Sox signed Kevin Hickey as an amateur free agent.
The Chicago Cubs traded Steve Renko to the Chicago White Sox for Larry Anderson and cash.
- August 20, 1977
The Boston Red Sox released Ramón Hernández.
The Chicago White Sox traded Steve Staniland (minors) to the St. Louis Cardinals for Don Kessinger.
The Texas Rangers traded Ed Kirkpatrick to the Milwaukee Brewers for a player to be named later. The Milwaukee Brewers sent Gorman Thomas (October 25, 1977) to the Texas Rangers to complete the trade.
- August 23, 1977
The Chicago Cubs released Bobby Darwin.
The St. Louis Cardinals selected Randy Wiles off waivers from the Chicago White Sox.
- August 25, 1977
The Texas Rangers purchased Jim Umbarger from the Oakland Athletics.
The Chicago White Sox released Bruce Dal Canton.
- August 30, 1977
The Toronto Blue Jays purchased Tim Nordbrook from the Chicago White Sox.
- August 31, 1977
The Los Angeles Dodgers released Boog Powell.
The St. Louis Cardinals traded Clay Carroll to the Chicago White Sox for players to be named later. 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.
The New York Mets traded Jerry Grote to the Los Angeles Dodgers for players to be named later. The Los Angeles Dodgers sent Daniel Smith (minors) (October 24, 1977) and Randy Rogers (minors) (October 24, 1977) to the New York Mets to complete the trade.
- September 2, 1977
The Chicago White Sox selected Henry Cruz off waivers from the Los Angeles Dodgers.
The Toronto Blue Jays selected John Hale off waivers from the Los Angeles Dodgers.
- September 5, 1977
The Houston Astros traded a player to be named later and Alex Taveras to the Los Angeles Dodgers for Danny Walton. The Houston Astros sent Bob Detherage (September 16, 1977) to the Los Angeles Dodgers to complete the trade.
- September 6, 1977
The California Angels selected Dave Kingman off waivers from the San Diego Padres.
- September 7, 1977
The Chicago Cubs released Jim Dwyer.
The St. Louis Cardinals selected Taylor Duncan off waivers from the Baltimore Orioles.
- September 8, 1977
The Seattle Mariners purchased Kevin Pasley from the Los Angeles Dodgers.
The Chicago White Sox selected Bill Nahorodny off waivers from the Philadelphia Phillies.
- September 9, 1977
The Cleveland Indians traded Ray Fosse to the Seattle Mariners for Bill Laxton and cash.
- September 11, 1977
Byron McLaughlin returned to the Seattle Mariners by Nuevo Laredo (Mexican) as part of earlier loan.
- September 12, 1977
The Boston Red Sox signed Keith MacWhorter as a free agent.
- September 13, 1977
The St. Louis Cardinals signed Jim Dwyer as a free agent.
The Seattle Mariners purchased Doc Medich from the Oakland Athletics.
- September 14, 1977
The Seattle Mariners purchased John Hale from the Toronto Blue Jays.
The Philadelphia Phillies released Carl Morton.
- September 15, 1977
The California Angels traded Dave Kingman to the New York Yankees for Randy Stein and cash.
- September 16, 1977
The California Angels purchased Carlos May from the New York Yankees.
- September 19, 1977
The Baltimore Orioles purchased Nelson Briles from the Texas Rangers.
The Boston Red Sox traded Breen Newcomer (minors) and cash to the Cincinnati Reds for Bob Bailey.
- September 22, 1977
The Chicago White Sox selected Bob Molinaro off waivers from the Detroit Tigers.
- September 26, 1977
The New York Mets selected Doc Medich off waivers from the Seattle Mariners.
- September 28, 1977
Tom Walker of the California Angels granted free agency.
The Chicago Cubs purchased Rudy Meoli from the Cincinnati Reds.
- September 29, 1977
The St. Louis Cardinals released Tony La Russa.
The Montreal Expos selected Rick Sawyer off waivers from the San Diego Padres.
- October, 1977
Eddie Bane of the Minnesota Twins granted free agency.
- October 3, 1977
The Cincinnati Reds released Joe Hoerner.
The Minnesota Twins released Jim Hughes.
The Minnesota Twins released Steve Luebber.
- October 10, 1977
Ross Grimsley of the Baltimore Orioles granted free agency.
The Kansas City Royals released Cookie Rojas.
- October 12, 1977
The Chicago Cubs released Randy Hundley.
- October 13, 1977
The Chicago Cubs traded Keith Drumright to the Houston Astros for Al Javier.
- October 14, 1977
The Philadelphia Phillies released Ron Clark.
- October 20, 1977
Ron Blomberg of the New York Yankees granted free agency.
Jack Brohamer of the Chicago White Sox granted free agency.
Frank Duffy of the Cleveland Indians granted free agency.
Mike Eden of the Atlanta Braves granted free agency.
Terry Forster of the Pittsburgh Pirates granted free agency.
Ray Fosse of the Seattle Mariners granted free agency.
Elrod Hendricks of the New York Yankees granted free agency.
Ubaldo Heredia of the Los Angeles Dodgers granted free agency.
Bill Melton of the Cleveland Indians granted free agency.
George Mitterwald of the Chicago Cubs granted free agency.
Randy Scarbery of the St. Louis Cardinals granted free agency.
Mac Scarce of the Cincinnati Reds granted free agency.
The Cincinnati Reds purchased Junior Kennedy from the San Francisco Giants.
- October 24, 1977
Elliott Maddox of the Baltimore Orioles granted free agency.
- October 25, 1977
The Philadelphia Phillies signed Wil Culmer as an amateur free agent.
Dick Drago of the Baltimore Orioles granted free agency.
Bobby Tolan of the Pittsburgh Pirates granted free agency.
Rusty Torres of the California Angels granted free agency.
The Minnesota Twins purchased Bombo Rivera from the Montreal Expos.
The Toronto Blue Jays released Phil Roof.
The Chicago Cubs traded Steve Hamrick (minors) to the Seattle Mariners for Larry Cox.
The Chicago Cubs traded José Cardenal to the Philadelphia Phillies for Manny Seoane.
The San Francisco Giants traded Frank Riccelli to the St. Louis Cardinals for a player to be named later. The St. Louis Cardinals sent Jim Dwyer (June 15, 1978) to the San Francisco Giants to complete the trade.
- October 26, 1977
The St. Louis Cardinals purchased Aurelio López from Mexico City Reds (Mexican).
The Minnesota Twins released Jim Shellenback.
- October 27, 1977
The Baltimore Orioles signed Willie Royster as a free agent.
Ken Boswell of the Houston Astros granted free agency.
Ollie Brown of the Philadelphia Phillies granted free agency.
Luis Meléndez of the San Diego Padres granted free agency.
Junior Moore of the Atlanta Braves granted free agency.
Tom Spencer of the Chicago White Sox granted free agency.
- October 28, 1977
Oscar Gamble of the Chicago White Sox granted free agency.
Rich Gossage of the Pittsburgh Pirates granted free agency.
Tom Griffin of the San Diego Padres granted free agency.
The Milwaukee Brewers released Jim Wynn.
- October 30, 1977
Mike Jorgensen of the Oakland Athletics granted free agency.
- October 31, 1977
Mike Torrez of the New York Yankees granted free agency.
The Toronto Blue Jays purchased Joe Henderson from the Cincinnati Reds.
The Chicago Cubs traded Bill Bonham to the Cincinnati Reds for Bill Caudill and Woodie Fryman.
- 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.
- 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.
- 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 Tommy Boggs, Adrian Devine and Eddie Miller to the Atlanta Braves. 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 Pittsburgh Pirates sent Nelson Norman and Al Oliver to the Texas Rangers. The New York Mets sent Jon Matlack to the Texas Rangers. The New York Mets sent John Milner to the Pittsburgh Pirates. 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.
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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