All Transactions
Transactions listed are from November 1 of previous year to April 1 of the following year.
- November 2, 1989
The Seattle Mariners signed Brian Giles as a free agent.
The Baltimore Orioles released Jamie Quirk.
- November 6, 1989
The Atlanta Braves signed Greg Olson as a free agent.
The Cincinnati Reds signed Donnie Scott as a free agent.
- November 8, 1989
Hiroshima Toyo Carp (Japan Central) purchased Mike Young from the Cleveland Indians.
The New York Yankees released Marcus Lawton.
The New York Yankees released Dale Mohorcic.
The Milwaukee Brewers released Jerry Reuss.
- November 9, 1989
The Milwaukee Brewers released Paul Mirabella.
The Chicago White Sox traded Jeff Bittiger to the Los Angeles Dodgers for Tracy Woodson.
- November 12, 1989
The Los Angeles Dodgers signed Henry Blanco as an amateur free agent.
- November 13, 1989
The Seattle Mariners signed Jeff Schaefer as a free agent.
The Montreal Expos signed Alex Pacheco as an amateur free agent.
Don Aase of the New York Mets granted free agency.
Dave Anderson of the Los Angeles Dodgers granted free agency.
Wally Backman of the Minnesota Twins granted free agency.
Doug Bair of the Pittsburgh Pirates granted free agency.
Chris Bando of the Oakland Athletics granted free agency.
Floyd Bannister of the Kansas City Royals granted free agency.
Kevin Bass of the Houston Astros granted free agency.
Oil Can Boyd of the Boston Red Sox granted free agency.
Bob Brenly of the San Francisco Giants granted free agency.
Hubie Brooks of the Montreal Expos granted free agency.
Bill Buckner of the Kansas City Royals granted free agency.
Carmelo Castillo of the Minnesota Twins granted free agency.
Dave Collins of the Cincinnati Reds granted free agency.
Danny Cox of the St. Louis Cardinals granted free agency.
Steve Crawford of the Kansas City Royals granted free agency.
Mark Davis of the San Diego Padres granted free agency.
Storm Davis of the Oakland Athletics granted free agency.
Bob Dernier of the Philadelphia Phillies granted free agency.
Bo Díaz of the Cincinnati Reds granted free agency.
Frank DiPino of the St. Louis Cardinals granted free agency.
Richard Dotson of the Chicago White Sox granted free agency.
Leon Durham of the St. Louis Cardinals granted free agency.
Nick Esasky of the Boston Red Sox granted free agency.
Darrell Evans of the Atlanta Braves granted free agency.
Bob Forsch of the Houston Astros granted free agency.
Terry Francona of the Milwaukee Brewers granted free agency.
Dámaso García of the Montreal Expos granted free agency.
Rich Gossage of the New York Yankees granted free agency.
Jim Gott of the Pittsburgh Pirates granted free agency.
Greg Gross of the Houston Astros granted free agency.
Mel Hall of the New York Yankees granted free agency.
Greg Harris of the Boston Red Sox granted free agency.
Neal Heaton of the Pittsburgh Pirates granted free agency.
Rickey Henderson of the Oakland Athletics granted free agency.
Keith Hernandez of the New York Mets granted free agency.
Ricky Horton of the St. Louis Cardinals granted free agency.
Kent Hrbek of the Minnesota Twins granted free agency.
Charles Hudson of the Detroit Tigers granted free agency.
Terry Kennedy of the San Francisco Giants granted free agency.
Bob Knepper of the San Francisco Giants granted free agency.
Mike Krukow of the San Francisco Giants granted free agency.
Steve Lake of the Philadelphia Phillies granted free agency.
Dennis Lamp of the Boston Red Sox granted free agency.
Mark Langston of the Montreal Expos granted free agency.
Tom Lawless of the Toronto Blue Jays granted free agency.
Rick Leach of the Texas Rangers granted free agency.
Craig Lefferts of the San Francisco Giants granted free agency.
Fred Lynn of the Detroit Tigers granted free agency.
Candy Maldonado of the San Francisco Giants granted free agency.
Carmelo Martínez of the San Diego Padres granted free agency.
Lee Mazzilli of the Toronto Blue Jays granted free agency.
Craig McMurtry of the Texas Rangers granted free agency.
Keith Moreland of the Baltimore Orioles granted free agency.
Lloyd Moseby of the Toronto Blue Jays granted free agency.
Pete O'Brien of the Cleveland Indians granted free agency.
Ken Oberkfell of the San Francisco Giants granted free agency.
Dave Parker of the Oakland Athletics granted free agency.
Tony Peña of the St. Louis Cardinals granted free agency.
Pascual Pérez of the Montreal Expos granted free agency.
Dan Petry of the California Angels granted free agency.
Gary Pettis of the Detroit Tigers granted free agency.
Ken Phelps of the Oakland Athletics granted free agency.
Tony Phillips of the Oakland Athletics granted free agency.
Ted Power of the St. Louis Cardinals granted free agency.
Joe Price of the Boston Red Sox granted free agency.
Shane Rawley of the Minnesota Twins granted free agency.
Jeff Reardon of the Minnesota Twins granted free agency.
Rick Rhoden of the Houston Astros granted free agency.
Ed Romero of the Milwaukee Brewers granted free agency.
Scott Sanderson of the Chicago Cubs granted free agency.
Dan Schatzeder of the Houston Astros granted free agency.
Dave Schmidt of the Baltimore Orioles granted free agency.
John Shelby of the Los Angeles Dodgers granted free agency.
Pat Sheridan of the San Francisco Giants granted free agency.
Bryn Smith of the Montreal Expos granted free agency.
Mike Smithson of the Boston Red Sox granted free agency.
Chris Speier of the San Francisco Giants granted free agency.
Harry Spilman of the Houston Astros granted free agency.
Frank Tanana of the Detroit Tigers granted free agency.
Walt Terrell of the New York Yankees granted free agency.
Mark Thurmond of the Baltimore Orioles granted free agency.
John Tudor of the Los Angeles Dodgers granted free agency.
Fernando Valenzuela of the Los Angeles Dodgers granted free agency.
Frank White of the Kansas City Royals granted free agency.
Mookie Wilson of the Toronto Blue Jays granted free agency.
Willie Wilson of the Kansas City Royals granted free agency.
Joel Youngblood of the Cincinnati Reds granted free agency.
Matt Young of the Oakland Athletics granted free agency.
Robin Yount of the Milwaukee Brewers granted free agency.
The Boston Red Sox released Jim Rice.
- November 14, 1989
The Pittsburgh Pirates signed Doug Bair as a free agent.
The New York Mets released Gary Carter.
- November 15, 1989
The Atlanta Braves released Jay Aldrich.
The Atlanta Braves released Charlie Puleo.
The Atlanta Braves released Bruce Sutter.
- November 16, 1989
The San Francisco Giants signed Kevin Bass as a free agent.
The St. Louis Cardinals signed Stan Clarke as a free agent.
The Pittsburgh Pirates released Logan Easley.
The San Diego Padres released Don Schulze.
The Pittsburgh Pirates released Mike Smith.
- November 17, 1989
The Atlanta Braves signed Nick Esasky as a free agent.
The Pittsburgh Pirates signed Steve Kiefer as a free agent.
- November 18, 1989
The Montreal Expos signed Steve Fireovid as a free agent.
- November 20, 1989
The Pittsburgh Pirates signed Ted Power as a free agent.
The Detroit Tigers signed Frank Tanana as a free agent.
The New York Mets signed Guillermo Garcia as an amateur free agent.
The Atlanta Braves purchased Alexis Infante from the Toronto Blue Jays.
The New York Yankees released Tom Brookens.
The Atlanta Braves released Mark Eichhorn.
The Philadelphia Phillies released Mike Maddux.
The Chicago White Sox released Russ Morman.
The Philadelphia Phillies released Dwayne Murphy.
The New York Yankees released Rafael Santana.
The Chicago Cubs traded Mitch Webster to the Cleveland Indians for Dave Clark.
- November 21, 1989
The Cleveland Indians signed Cecilio Guante as a free agent.
The New York Yankees signed Pascual Pérez as a free agent.
The Pittsburgh Pirates released Dann Bilardello.
The Pittsburgh Pirates released Morris Madden.
The Detroit Tigers released Frank Williams.
- November 22, 1989
The New York Mets signed Quilvio Veras as an amateur free agent.
The Chicago Cubs traded Rich Scheid to the Chicago White Sox for Chuck Mount (minors).
- November 24, 1989
The Texas Rangers signed Gary Pettis as a free agent.
- November 25, 1989
The Pittsburgh Pirates signed Danny Sheaffer as a free agent.
- November 27, 1989
The Boston Red Sox signed Tony Peña as a free agent.
The Toronto Blue Jays signed Mookie Wilson as a free agent.
- November 28, 1989
The San Francisco Giants signed Dave Anderson as a free agent.
The Oakland Athletics signed Rickey Henderson as a free agent.
The Cleveland Indians signed Candy Maldonado as a free agent.
The St. Louis Cardinals signed Bryn Smith as a free agent.
- November 29, 1989
The Pittsburgh Pirates signed Walt Terrell as a free agent.
The Pittsburgh Pirates released Brian Fisher.
- November 30, 1989
The St. Louis Cardinals signed Danny Cox as a free agent.
The New York Yankees signed Mel Hall as a free agent.
The Baltimore Orioles released Jim Traber.
- December 1, 1989
The California Angels signed Mark Langston as a free agent.
The Philadelphia Phillies signed Carmelo Martínez as a free agent.
The Oakland Athletics signed Ramón Fermín as an amateur free agent.
The Cleveland Indians released Mark Salas.
- December 3, 1989
The Milwaukee Brewers signed Dave Parker as a free agent.
- December 4, 1989
The San Francisco Giants drafted José Álvarez from the Atlanta Braves in the 1989 rule 5 draft.
The Houston Astros drafted William Brennan from the Los Angeles Dodgers in the 1989 rule 5 draft.
The Baltimore Orioles drafted Marty Brown from the Cincinnati Reds in the 1989 rule 5 draft.
The Philadelphia Phillies drafted Sil Campusano from the Toronto Blue Jays in the 1989 rule 5 draft.
The Pittsburgh Pirates drafted Gordon Dillard from the Philadelphia Phillies in the 1989 rule 5 draft.
The San Diego Padres drafted Mike Dunne from the Seattle Mariners in the 1989 rule 5 draft.
The Houston Astros drafted Albert Hall from the Pittsburgh Pirates in the 1989 rule 5 draft.
The Oakland Athletics drafted Reggie Harris from the Boston Red Sox in the 1989 rule 5 draft.
The Houston Astros drafted Xavier Hernandez from the Toronto Blue Jays in the 1989 rule 5 draft.
The Philadelphia Phillies drafted Dave Hollins from the San Diego Padres in the 1989 rule 5 draft.
The San Francisco Giants drafted Chuck Jackson from the Houston Astros in the 1989 rule 5 draft.
The New York Mets drafted Brent Knackert from the Chicago White Sox in the 1989 rule 5 draft.
The Cincinnati Reds drafted Tim Layana from the New York Yankees in the 1989 rule 5 draft.
The Minnesota Twins drafted Shane Mack from the San Diego Padres in the 1989 rule 5 draft.
The Montreal Expos drafted Bob Malloy from the Texas Rangers in the 1989 rule 5 draft.
The Texas Rangers drafted Ramón Mañón from the New York Yankees in the 1989 rule 5 draft.
The Detroit Tigers drafted Johnny Paredes from the Montreal Expos in the 1989 rule 5 draft.
The Montreal Expos drafted Bill Sampen from the Pittsburgh Pirates in the 1989 rule 5 draft.
The Detroit Tigers drafted Steve Wapnick from the Toronto Blue Jays in the 1989 rule 5 draft.
The Los Angeles Dodgers signed José Parra as an amateur free agent.
The Cleveland Indians released Ed Wojna.
The New York Yankees traded Don Slaught to the Pittsburgh Pirates for Jeff Robinson and Willie Smith.
- December 5, 1989
The Los Angeles Dodgers drafted Mike Christopher from the New York Yankees in the 1989 minor league draft.
The Pittsburgh Pirates drafted Jim Czajkowski from the Atlanta Braves in the 1989 minor league draft.
The Chicago White Sox drafted Jeff Fassero from the St. Louis Cardinals in the 1989 minor league draft.
The Texas Rangers drafted Gary Green from the San Diego Padres in the 1989 minor league draft.
The Toronto Blue Jays drafted Mike Maksudian from Miami (Florida State) in the 1989 minor league draft.
The Cleveland Indians drafted Eddie Zambrano from the Boston Red Sox in the 1989 minor league draft.
The Baltimore Orioles signed Jay Aldrich as a free agent.
The Kansas City Royals signed Steve Crawford as a free agent.
The Kansas City Royals signed Richard Dotson as a free agent.
The Baltimore Orioles signed Jeff McKnight as a free agent.
The Detroit Tigers signed Tony Phillips as a free agent.
The Baltimore Orioles traded Cesar Mejia (minors) and Keith Hughes to the New York Mets for Joaquin Contreras (minors) and John Mitchell.
- December 6, 1989
The Milwaukee Brewers signed Tom Edens as a free agent.
The Houston Astros signed Bill Gullickson as a free agent.
The Pittsburgh Pirates signed Neal Heaton as a free agent.
The St. Louis Cardinals signed Ricky Horton as a free agent.
The Minnesota Twins signed Kent Hrbek as a free agent.
The Philadelphia Phillies signed Steve Lake as a free agent.
The Boston Red Sox signed Dennis Lamp as a free agent.
The San Diego Padres signed Craig Lefferts as a free agent.
The San Diego Padres signed Fred Lynn as a free agent.
The Houston Astros signed Ken Oberkfell as a free agent.
The Boston Red Sox signed Jeff Reardon as a free agent.
The Pittsburgh Pirates released Benny Distefano.
The Detroit Tigers traded Pat Austin (minors), Marcos Betances (minors) and Bill Henderson (minors) to the St. Louis Cardinals for Matt Kinzer and Jim Lindeman.
The Cleveland Indians traded Joe Carter to the San Diego Padres for Sandy Alomar, Carlos Baerga and Chris James.
The Cincinnati Reds traded Don Brown (minors) and John Franco to the New York Mets for Kip Gross and Randy Myers.
- December 7, 1989
The Montreal Expos signed Keith Atherton as a free agent.
The Montreal Expos signed Oil Can Boyd as a free agent.
The Kansas City Royals signed Storm Davis as a free agent.
The Los Angeles Dodgers signed Jim Gott as a free agent.
The Cleveland Indians signed Keith Hernandez as a free agent.
The Toronto Blue Jays signed Tom Lawless as a free agent.
The Montreal Expos signed Dale Mohorcic as a free agent.
The Detroit Tigers signed Lloyd Moseby as a free agent.
The Seattle Mariners signed Pete O'Brien as a free agent.
The Kansas City Royals signed Frank White as a free agent.
The Kansas City Royals signed Willie Wilson as a free agent.
The Kansas City Royals released Israel Sánchez.
The Chicago Cubs traded Paul Kilgus to the Toronto Blue Jays for José Núñez.
- December 8, 1989
The Cleveland Indians signed Tom Brookens as a free agent.
The San Francisco Giants signed Terry Kennedy as a free agent.
The Oakland Athletics signed Ken Phelps as a free agent.
The Milwaukee Brewers signed Joe Redfield as a free agent.
The Detroit Tigers released Rick Schu.
- December 11, 1989
The Montreal Expos signed Joaquín Andújar as a free agent.
The Kansas City Royals signed Mark Davis as a free agent.
- December 12, 1989
The San Francisco Giants signed Mark Bailey as a free agent.
The Milwaukee Brewers signed Terry Francona as a free agent.
The New York Mets signed Orlando Mercado as a free agent.
The Cleveland Indians traded Steve Davis to the Los Angeles Dodgers for Manny Francois (minors) and Joe Kesselmark (minors).
The Cincinnati Reds traded Tim Leary and Van Snider to the New York Yankees for Rod Imes (minors) and Hal Morris.
- December 13, 1989
The Milwaukee Brewers signed Mike Capel as a free agent.
The St. Louis Cardinals signed Frank DiPino as a free agent.
The Oakland Athletics signed Jamie Quirk as a free agent.
The Boston Red Sox signed Billy Jo Robidoux as a free agent.
The Oakland Athletics signed Scott Sanderson as a free agent.
The Montreal Expos signed Dave Schmidt as a free agent.
The Boston Red Sox signed Jeff Stone as a free agent.
The New York Mets signed Kelvin Torve as a free agent.
The Chicago Cubs released Pat Perry.
- December 14, 1989
The Philadelphia Phillies signed Rod Booker as a free agent.
The St. Louis Cardinals signed John Tudor as a free agent.
- December 15, 1989
The Pittsburgh Pirates signed Rich Sauveur as a free agent.
The Cleveland Indians signed Doug Sisk as a free agent.
The Cleveland Indians signed Steve Springer as a free agent.
The Los Angeles Dodgers signed Fernando Valenzuela as a free agent.
The Seattle Mariners signed Matt Young as a free agent.
The Atlanta Braves traded Jim Lemasters (minors) and Gerald Perry to the Kansas City Royals for Charlie Leibrandt and Rick Luecken.
- December 17, 1989
The Atlanta Braves traded Ricky Trlicek to the Toronto Blue Jays for Kevin Batiste and Ernie Whitt.
- December 18, 1989
The Seattle Mariners signed Vance Lovelace as a free agent.
- December 19, 1989
The Chicago Cubs signed Greg Booker as a free agent.
The Texas Rangers signed Thad Bosley as a free agent.
The California Angels signed Mark Eichhorn as a free agent.
The Houston Astros signed Dan Schatzeder as a free agent.
The Los Angeles Dodgers signed John Shelby as a free agent.
The Houston Astros signed Harry Spilman as a free agent.
The Milwaukee Brewers signed Robin Yount as a free agent.
Mike Davis of the Los Angeles Dodgers granted free agency.
The Boston Red Sox released Rick Cerone.
The San Diego Padres released Dave Leiper.
- December 20, 1989
The New York Yankees signed Rick Cerone as a free agent.
The Cleveland Indians signed Carl Willis as a free agent.
The California Angels released Mark Clear.
The Baltimore Orioles released Butch Davis.
The Detroit Tigers released Willie Hernández.
The Boston Red Sox released Sam Horn.
The Boston Red Sox released Bob Stanley.
The Los Angeles Dodgers traded Mike Marshall and Alejandro Peña to the New York Mets for Juan Samuel.
- December 21, 1989
The Los Angeles Dodgers signed Hubie Brooks as a free agent.
The Los Angeles Dodgers signed Mike Maddux as a free agent.
The Kansas City Royals signed Russ Morman as a free agent.
The California Angels signed Mike Smithson as a free agent.
The San Diego Padres signed Eddie Williams as a free agent.
The Cleveland Indians released Rich Yett.
- December 22, 1989
The New York Yankees signed Dámaso García as a free agent.
- December 27, 1989
The Seattle Mariners signed Bryan Clark as a free agent.
The New York Yankees signed Jim Walewander as a free agent.
- December 29, 1989
The Minnesota Twins signed Rich Yett as a free agent.
- Before 1990 Season
The Atlanta Braves signed Rick Leach as a free agent.
Darryl Motley sent from the Montreal Expos to the Cincinnati Reds in an unknown transaction.
The Boston Red Sox released Rob Woodward.
The Baltimore Orioles signed Rob Woodward as a free agent.
- January, 1990
The Kansas City Royals signed Jay Baller as a free agent.
- January 2, 1990
The San Diego Padres signed Mike Raczka as a free agent.
The Chicago Cubs released Vance Law.
- January 3, 1990
The Chicago Cubs purchased Dave Pavlas from the Texas Rangers.
The Minnesota Twins released Jeff Bronkey.
The Chicago Cubs traded Bryan House (minors) to the Texas Rangers for Rey Sánchez.
- January 4, 1990
The New York Yankees released Chris Bushing.
- January 5, 1990
The California Angels signed Donnie Hill as a free agent.
The Texas Rangers signed Craig McMurtry as a free agent.
The Cincinnati Reds signed Paul Noce as a free agent.
The Cleveland Indians signed Fernando Hernández as an amateur free agent.
The New York Mets traded Craig Repoz (minors) to the San Diego Padres for Nikco Riesgo.
- January 8, 1990
The Minnesota Twins signed Carmelo Castillo as a free agent.
The Atlanta Braves signed Darrell Evans as a free agent.
The Pittsburgh Pirates purchased Roberto Ramírez from Mexico City Reds (Mexican).
- January 9, 1990
The Texas Rangers signed Nick Capra as a free agent.
The Los Angeles Dodgers signed Butch Davis as a free agent.
The Cleveland Indians signed Efrain Valdez as a free agent.
The California Angels traded Colin Charland (minors) and Jeff Manto to the Cleveland Indians for Scott Bailes.
- January 10, 1990
The Cleveland Indians signed Rafael Santana as a free agent.
The Toronto Blue Jays signed Tilson Brito as an amateur free agent.
The Houston Astros signed Raúl Chávez as an amateur free agent.
The Toronto Blue Jays signed José Herrera as an amateur free agent.
The Toronto Blue Jays signed Sandy Martínez as an amateur free agent.
The Baltimore Orioles traded Larry Sheets to the Detroit Tigers for Mike Brumley.
- January 11, 1990
The San Diego Padres signed Ronn Reynolds as a free agent.
- January 12, 1990
The Baltimore Orioles signed Joe Price as a free agent.
The Minnesota Twins traded Jim Davins (minors) to the Montreal Expos for Jim Dwyer.
- January 14, 1990
The Pittsburgh Pirates signed Mark Ross as a free agent.
- January 15, 1990
The Detroit Tigers signed Cecil Fielder as a free agent.
The Detroit Tigers signed Ed Romero as a free agent.
The Pittsburgh Pirates signed Mark Ryal as a free agent.
The Oakland Athletics signed Fausto Cruz as an amateur free agent.
- January 16, 1990
The Oakland Athletics signed Dave Leiper as a free agent.
- January 19, 1990
The San Francisco Giants signed Gary Carter as a free agent.
- January 20, 1990
The Milwaukee Brewers signed Joe Kmak as a free agent.
The San Francisco Giants signed Randy O'Neal as a free agent.
- January 22, 1990
The Detroit Tigers signed Dan Petry as a free agent.
The Oakland Athletics signed Kevin Ward as a free agent.
- January 23, 1990
The Chicago White Sox signed Matt Stark as a free agent.
The Toronto Blue Jays signed Giovanni Carrara as an amateur free agent.
- January 24, 1990
The Montreal Expos released John Candelaria.
The Atlanta Braves traded Ken Pennington (minors) and Gary Eave to the Seattle Mariners for Jim Presley.
- January 25, 1990
The Chicago White Sox signed Luis Andújar as an amateur free agent.
- January 26, 1990
The Houston Astros signed Terry Clark as a free agent.
The Los Angeles Dodgers signed Pat Perry as a free agent.
- January 28, 1990
The San Francisco Giants signed Dan Quisenberry as a free agent.
- January 29, 1990
The Cincinnati Reds signed Skeeter Barnes as a free agent.
The Toronto Blue Jays signed Jim Eppard as a free agent.
- January 30, 1990
The Pittsburgh Pirates signed Dann Bilardello as a free agent.
- January 31, 1990
The Pittsburgh Pirates signed Wally Backman as a free agent.
- February 1, 1990
The Houston Astros signed Brian Fisher as a free agent.
The Houston Astros signed Mark Thurmond as a free agent.
- February 2, 1990
The California Angels signed Mark Clear as a free agent.
The Toronto Blue Jays signed Ozzie Virgil as a free agent.
The Chicago White Sox signed Nerio Rodríguez as an amateur free agent.
- February 3, 1990
The California Angels released Greg Minton.
- February 5, 1990
The Boston Red Sox signed Jim Pankovits as a free agent.
The California Angels signed Rick Schu as a free agent.
- February 6, 1990
The Boston Red Sox signed Mike Dalton as a free agent.
- February 10, 1990
The Los Angeles Dodgers signed Roberto Durán as an amateur free agent.
The Los Angeles Dodgers signed Willis Otáñez as an amateur free agent.
- February 12, 1990
The Houston Astros signed Jim Olander as a free agent.
- February 13, 1990
The Houston Astros signed Roberto Petagine as an amateur free agent.
- February 15, 1990
The Boston Red Sox signed Bill Buckner as a free agent.
The Boston Red Sox signed Greg Harris as a free agent.
The Kansas City Royals signed Pat Sheridan as a free agent.
The California Angels signed Reggie Williams as a free agent.
The Seattle Mariners signed Eddy Díaz as an amateur free agent.
- February 16, 1990
The St. Louis Cardinals signed Dave Collins as a free agent.
The Kansas City Royals signed Israel Sánchez as a free agent.
- February 17, 1990
The New York Yankees signed Mariano Rivera as an amateur free agent.
- February 18, 1990
The Texas Rangers signed Julio Santana as an amateur free agent.
- February 20, 1990
The Los Angeles Dodgers signed Don Aase as a free agent.
The Baltimore Orioles signed Sam Horn as a free agent.
The Cleveland Indians signed Al Nipper as a free agent.
The Detroit Tigers signed Felipe Lira as an amateur free agent.
- February 21, 1990
The California Angels signed Greg Minton as a free agent.
- February 22, 1990
The Baltimore Orioles signed Danny Boone as a free agent.
- February 27, 1990
The San Diego Padres traded Omar Olivares to the St. Louis Cardinals for Alex Cole and Steve Peters.
The Montreal Expos traded Pat Pacillo to the Seattle Mariners for Jerry Goff.
- February 28, 1990
The Minnesota Twins signed John Candelaria as a free agent.
The Texas Rangers signed Wilson Heredia as an amateur free agent.
- March, 1990
The Chicago White Sox signed Jerry Reuss as a free agent.
- March 2, 1990
The Montreal Expos signed Chris Bushing as a free agent.
- March 5, 1990
The California Angels released Robinson Checo.
- March 7, 1990
The Pittsburgh Pirates signed Mark Huismann as a free agent.
The Kansas City Royals signed Dan Miceli as an amateur free agent.
- March 13, 1990
The San Francisco Giants signed Ed Vosberg as a free agent.
The Houston Astros traded a player to be named later and Dave Silvestri to the New York Yankees for Orlando Miller. The Houston Astros sent Daven Bond (minors) (June 11, 1990) to the New York Yankees to complete the trade.
- March 17, 1990
The Montreal Expos signed Eric Bullock as a free agent.
- March 18, 1990
The Atlanta Braves traded Miguel Sabino (minors) and Jeff Wetherby to the Cleveland Indians for a player to be named later and Tommy Hinzo. The Cleveland Indians sent Dwight Taylor (July, 1990) to the Atlanta Braves to complete the trade.
- March 19, 1990
The Atlanta Braves purchased Vinny Castilla from Saltillo (Mexican).
- March 26, 1990
The New York Mets signed D.J. Dozier as an amateur free agent.
The Cleveland Indians signed Julián Tavárez as an amateur free agent.
- March 27, 1990
The Cleveland Indians released Andy Allanson.
- March 30, 1990
The Philadelphia Phillies released Jeff Gray.
The Chicago White Sox released Tracy Woodson.
The Detroit Tigers traded Doug Strange to the Houston Astros for Lou Frazier.
- March 31, 1990
The Philadelphia Phillies purchased Darrel Akerfelds from the Texas Rangers.
The Kansas City Royals released Mark Lee.
The Cleveland Indians released Brett Merriman.
The Pittsburgh Pirates released Rich Sauveur.
The Kansas City Royals traded José de Jesús to the Philadelphia Phillies for Steve Jeltz.
- April 1, 1990
The Baltimore Orioles signed Armando Benítez as an amateur free agent.
The Houston Astros traded Terry Wells to the Los Angeles Dodgers for Franklin Stubbs.
- April 2, 1990
The Texas Rangers signed Andy Allanson as a free agent.
The Chicago White Sox released John Davis.
The Cleveland Indians released Denny González.
The Detroit Tigers released Wayne Housie.
The Kansas City Royals released Terry Leach.
The New York Yankees released Freddie Toliver.
The Cleveland Indians released Paul Zuvella.
The Detroit Tigers traded Chuck Everson (minors) to the Kansas City Royals for Jerry Don Gleaton.
The Montreal Expos traded Jeff Huson to the Texas Rangers for Drew Hall.
- April 3, 1990
The California Angels signed Brett Merriman as a free agent.
The Montreal Expos released Joaquín Andújar.
The Chicago Cubs released Greg Booker.
The Baltimore Orioles released Mike Brumley.
The Chicago White Sox released Jeff Fassero.
The Houston Astros released Roger Mason.
The Chicago White Sox released Jerry Reuss.
The Kansas City Royals released Pat Sheridan.
The Cincinnati Reds traded Jeff Richardson and Mike Roesler to the Pittsburgh Pirates for Billy Hatcher.
- April 4, 1990
Rick Leach of the Atlanta Braves granted free agency.
The Atlanta Braves released Darrell Evans.
The Minnesota Twins traded Mike Pomeranz (minors) to the Pittsburgh Pirates for Orlando Lind (minors) and Junior Ortiz.
- April 5, 1990
The San Francisco Giants signed Greg Booker as a free agent.
The San Francisco Giants signed Bob Knepper as a free agent.
Jeff Kaiser of the Cleveland Indians granted free agency.
The Chicago White Sox traded Robert Fletcher (minors) to the Montreal Expos for Mike Campbell.
The Seattle Mariners selected Brent Knackert off waivers from the New York Mets.
The San Francisco Giants selected Brad Komminsk off waivers from the Cleveland Indians.
- April 6, 1990
The Seattle Mariners signed Mike Brumley as a free agent.
The Philadelphia Phillies signed Dickie Noles as a free agent.
The San Francisco Giants signed Carlos Valdez as an amateur free agent.
Mike Kingery of the Seattle Mariners granted free agency.
The Seattle Mariners released Tom Niedenfuer.
The Atlanta Braves released John Russell.
- April 7, 1990
The Milwaukee Brewers signed John Davis as a free agent.
The Boston Red Sox signed Jeff Gray as a free agent.
The Minnesota Twins signed Terry Leach as a free agent.
The Montreal Expos traded Andy McGaffigan to the San Francisco Giants for a player to be named later. The San Francisco Giants sent Steve Hecht (minors) (June 26, 1990) to the Montreal Expos to complete the trade.
- April 8, 1990
The San Francisco Giants signed Rick Leach as a free agent.
The Detroit Tigers signed Urbano Lugo as a free agent.
The Milwaukee Brewers signed Paul Mirabella as a free agent.
The Detroit Tigers signed Mark Salas as a free agent.
The San Francisco Giants released Donell Nixon.
- April 9, 1990
The Cleveland Indians signed Jeff Fassero as a free agent.
- April 10, 1990
The St. Louis Cardinals signed Tom Niedenfuer as a free agent.
The Pittsburgh Pirates traded Joe Szekely (minors) to the Toronto Blue Jays for Brian Morrison (minors).
- April 11, 1990
The Cleveland Indians signed Jeff Kaiser as a free agent.
- April 13, 1990
The Kansas City Royals signed Paul Zuvella as a free agent.
The Minnesota Twins traded Jeff Satzinger (minors) and cash to the Texas Rangers for Fred Manrique.
- April 14, 1990
The San Francisco Giants signed Mike Kingery as a free agent.
The Houston Astros signed Jerry Reuss as a free agent.
- April 16, 1990
The Baltimore Orioles signed Donell Nixon as a free agent.
- April 17, 1990
The New York Yankees signed Rich Batchelor as an amateur free agent.
The Cleveland Indians traded Charlie Scott (minors) to the Minnesota Twins for Alan Cockrell.
- April 23, 1990
The Montreal Expos traded Rex Hudler to the St. Louis Cardinals for John Costello.
- April 25, 1990
The Chicago Cubs signed Pat Sheridan as a free agent.
The Chicago Cubs signed Chico Walker as a free agent.
The San Francisco Giants released Andy McGaffigan.
The Texas Rangers released Craig McMurtry.
The Seattle Mariners released Jerry Reed.
The Cleveland Indians released Rafael Santana.
- April 26, 1990
The Milwaukee Brewers released John Davis.
- April 27, 1990
The Milwaukee Brewers released Terry Francona.
The Baltimore Orioles released Jeff Schwarz.
- April 28, 1990
The Seattle Mariners signed Marino Santana as an amateur free agent.
The Atlanta Braves traded a player to be named later and Kevin Dean (minors) to the Houston Astros for Charlie Kerfeld. The Atlanta Braves sent Lee Johnson (minors) (October 29, 1990) to the Houston Astros to complete the trade.
- April 29, 1990
The California Angels traded Rich Monteleone and Claudell Washington to the New York Yankees for Luis Polonia.
- April 30, 1990
The Texas Rangers returned Ramón Mañón (earlier draft pick) to the New York Yankees.
The Chicago White Sox released Greg Walker.
The Chicago Cubs traded Frank Campos (minors) to the Chicago White Sox for Bill Long.
The New York Mets selected Daryl Boston off waivers from the Chicago White Sox.
The Atlanta Braves selected Joe Hesketh off waivers from the Montreal Expos.
The Cleveland Indians selected Sergio Valdez off waivers from the Atlanta Braves.
- May 1, 1990
The Houston Astros sent Mark Thurmond to the San Francisco Giants as part of a conditional deal.
The Detroit Tigers returned Johnny Paredes (earlier draft pick) to the Montreal Expos.
The Detroit Tigers returned Steve Wapnick (earlier draft pick) to the Toronto Blue Jays.
The San Diego Padres signed John Davis as a free agent.
Dennis Powell of the Seattle Mariners granted free agency.
The New York Yankees released Chris Howard.
- May 2, 1990
The San Diego Padres released Mike Raczka.
The Atlanta Braves traded Greg Tubbs to the Pittsburgh Pirates for Rico Rossy.
The Baltimore Orioles selected Brad Komminsk off waivers from the San Francisco Giants.
- May 3, 1990
The Boston Red Sox signed Jerry Reed as a free agent.
- May 4, 1990
The Baltimore Orioles signed Greg Walker as a free agent.
The Boston Red Sox traded Lee Smith to the St. Louis Cardinals for Tom Brunansky.
- May 5, 1990
The St. Louis Cardinals signed Terry Francona as a free agent.
- May 7, 1990
The Milwaukee Brewers signed Dennis Powell as a free agent.
The Cleveland Indians selected Stan Jefferson off waivers from the Baltimore Orioles.
- May 8, 1990
The Texas Rangers signed John Russell as a free agent.
The Texas Rangers released Andy Allanson.
The Toronto Blue Jays released Mike Flanagan.
- May 9, 1990
The Kansas City Royals signed Andy McGaffigan as a free agent.
- May 10, 1990
The Cleveland Indians signed Chris Howard as a free agent.
The Texas Rangers signed Craig McMurtry as a free agent.
- May 11, 1990
The Chicago White Sox signed Olmedo Sáenz as an amateur free agent.
The California Angels traded Mike Witt to the New York Yankees for Dave Winfield.
- May 13, 1990
The Los Angeles Dodgers traded Willie Randolph to the Oakland Athletics for Stan Javier.
- May 14, 1990
The Kansas City Royals released Larry McWilliams.
The Houston Astros released Jerry Reuss.
- May 16, 1990
The Atlanta Braves released Jody Davis.
- May 18, 1990
The Pittsburgh Pirates signed Roger Mason as a free agent.
The Pittsburgh Pirates traded Scott Medvin to the Seattle Mariners for Lee Hancock.
- May 19, 1990
The Los Angeles Dodgers signed Darío Veras as an amateur free agent.
- May 22, 1990
The Oakland Athletics signed Mike Raczka as a free agent.
- May 23, 1990
The Milwaukee Brewers signed Mark Lee as a free agent.
- May 24, 1990
The Cleveland Indians released Jim Tatum.
The Seattle Mariners traded Gary Eave to the San Francisco Giants for Russ Swan.
- May 25, 1990
The Texas Rangers signed Jeff Bronkey as a free agent.
The California Angels signed Freddie Toliver as a free agent.
The Houston Astros released Doug Strange.
- May 28, 1990
The Detroit Tigers signed Jody Davis as a free agent.
The Houston Astros released Steve Lombardozzi.
- May 30, 1990
The Minnesota Twins traded Francisco Oliveras to the San Francisco Giants for a player to be named later. The San Francisco Giants sent Ed Gustafson (minors) (September 26, 1990) to the Minnesota Twins to complete the trade.
- May 31, 1990
The Houston Astros sent Jim Olander to the Milwaukee Brewers as part of a conditional deal.
- June, 1990
The Kansas City Royals signed Chris Codiroli as a free agent.
- June 1, 1990
The Pittsburgh Pirates signed Angelo Encarnación as an amateur free agent.
- June 2, 1990
The Texas Rangers released Thad Bosley.
The Los Angeles Dodgers released John Shelby.
- June 4, 1990
The Detroit Tigers traded Matt Nokes to the New York Yankees for Lance McCullers and Clay Parker.
The Atlanta Braves drafted Chipper Jones in the 1st round (1st pick) of the 1990 amateur draft. Player signed June 4, 1990.
The Detroit Tigers drafted Tony Clark in the 1st round (2nd pick) of the 1990 amateur draft. Player signed July 10, 1990.
The Philadelphia Phillies drafted Mike Lieberthal in the 1st round (3rd pick) of the 1990 amateur draft. Player signed June 4, 1990.
The Chicago White Sox drafted Alex Fernandez in the 1st round (4th pick) of the 1990 amateur draft. Player signed June 4, 1990.
The Pittsburgh Pirates drafted Kurt Miller in the 1st round (5th pick) of the 1990 amateur draft. Player signed June 6, 1990.
The Seattle Mariners drafted Marc Newfield in the 1st round (6th pick) of the 1990 amateur draft. Player signed June 10, 1990.
The Cincinnati Reds drafted Dan Wilson in the 1st round (7th pick) of the 1990 amateur draft. Player signed June 30, 1990.
The Cleveland Indians drafted Tim Costo in the 1st round (8th pick) of the 1990 amateur draft. Player signed June 20, 1990.
The New York Yankees drafted Carl Everett in the 1st round (10th pick) of the 1990 amateur draft. Player signed June 8, 1990.
The Montreal Expos drafted Shane Andrews in the 1st round (11th pick) of the 1990 amateur draft. Player signed June 5, 1990.
The Minnesota Twins drafted Todd Ritchie in the 1st round (12th pick) of the 1990 amateur draft. Player signed June 13, 1990.
The St. Louis Cardinals drafted Donovan Osborne in the 1st round (13th pick) of the 1990 amateur draft. Player signed July 9, 1990.
The Oakland Athletics drafted Todd Van Poppel in the 1st round (14th pick) of the 1990 amateur draft. Player signed July 16, 1990.
The San Francisco Giants drafted Adam Hyzdu in the 1st round (15th pick) of the 1990 amateur draft. Player signed June 15, 1990.
The Texas Rangers drafted Dan Smith in the 1st round (16th pick) of the 1990 amateur draft. Player signed June 21, 1990.
The New York Mets drafted Jeromy Burnitz in the 1st round (17th pick) of the 1990 amateur draft. Player signed June 13, 1990.
The St. Louis Cardinals drafted Aaron Holbert in the 1st round (18th pick) of the 1990 amateur draft. Player signed June 14, 1990.
The Baltimore Orioles drafted Mike Mussina in the 1st round (20th pick) of the 1990 amateur draft. Player signed July 28, 1990.
The Toronto Blue Jays drafted Steve Karsay in the 1st round (22nd pick) of the 1990 amateur draft. Player signed July 16, 1990.
The Chicago Cubs drafted Lance Dickson in the 1st round (23rd pick) of the 1990 amateur draft. Player signed June 11, 1990.
The Montreal Expos drafted Rondell White in the 1st round (24th pick) of the 1990 amateur draft. Player signed June 8, 1990.
The San Diego Padres drafted Robbie Beckett in the 1st round (25th pick) of the 1990 amateur draft. Player signed June 11, 1990.
The Montreal Expos drafted Gabe White in the 1st round (28th pick) of the 1990 amateur draft. Player signed June 7, 1990.
The Minnesota Twins drafted Midre Cummings in the 1st round (29th pick) of the 1990 amateur draft. Player signed June 12, 1990.
The Houston Astros drafted Brian Williams in the 1st round (31st pick) of the 1990 amateur draft. Player signed July 16, 1990.
The San Diego Padres drafted Scott Sanders in the 1st round (32nd pick) of the 1990 amateur draft. Player signed June 8, 1990.
The San Francisco Giants drafted Marcus Jensen in the 1st round (33rd pick) of the 1990 amateur draft. Player signed June 15, 1990.
The Montreal Expos drafted Stan Spencer in the 1st round (35th pick) of the 1990 amateur draft. Player signed June 30, 1990.
The Oakland Athletics drafted Kirk Dressendorfer in the 1st round (36th pick) of the 1990 amateur draft. Player signed June 9, 1990.
The Montreal Expos drafted Ben Van Ryn in the 1st round (37th pick) of the 1990 amateur draft. Player signed June 20, 1990.
The Montreal Expos drafted Tavo Álvarez in the 2nd round of the 1990 amateur draft. Player signed June 19, 1990.
The New York Yankees drafted Robert Eenhoorn in the 2nd round of the 1990 amateur draft. Player signed June 10, 1990.
The Cincinnati Reds drafted Keith Gordon in the 2nd round of the 1990 amateur draft.
The Montreal Expos drafted Chris Haney in the 2nd round of the 1990 amateur draft. Player signed June 13, 1990.
The Chicago Cubs drafted Ryan Hawblitzel in the 2nd round of the 1990 amateur draft. Player signed June 7, 1990.
The Oakland Athletics drafted Eric Helfand in the 2nd round of the 1990 amateur draft. Player signed June 22, 1990.
The Toronto Blue Jays drafted Tim Hyers in the 2nd round of the 1990 amateur draft. Player signed June 9, 1990.
The New York Mets drafted Aaron Ledesma in the 2nd round of the 1990 amateur draft. Player signed June 5, 1990.
The California Angels drafted Phil Leftwich in the 2nd round of the 1990 amateur draft. Player signed June 7, 1990.
The Minnesota Twins drafted Jayhawk Owens in the 2nd round of the 1990 amateur draft. Player signed June 12, 1990.
The Boston Red Sox drafted Frankie Rodriguez in the 2nd round of the 1990 amateur draft. Player signed June 2, 1991.
The San Francisco Giants drafted Joe Rosselli in the 2nd round of the 1990 amateur draft. Player signed June 7, 1990.
The Baltimore Orioles drafted Erik Schullstrom in the 2nd round of the 1990 amateur draft. Player signed June 8, 1990.
The Cleveland Indians drafted Darrell Whitmore in the 2nd round of the 1990 amateur draft. Player signed June 13, 1990.
The Chicago White Sox drafted Bob Wickman in the 2nd round of the 1990 amateur draft. Player signed June 6, 1990.
The Minnesota Twins drafted Rich Becker in the 3rd round of the 1990 amateur draft. Player signed June 6, 1990.
The Toronto Blue Jays drafted Felipe Crespo in the 3rd round of the 1990 amateur draft. Player signed September 22, 1990.
The Chicago White Sox drafted Robert Ellis in the 3rd round of the 1990 amateur draft. Player signed June 5, 1990.
The Seattle Mariners drafted Dave Fleming in the 3rd round of the 1990 amateur draft. Player signed June 18, 1990.
The New York Mets drafted Micah Franklin in the 3rd round of the 1990 amateur draft. Player signed June 10, 1990.
The Cleveland Indians drafted Jason Hardtke in the 3rd round of the 1990 amateur draft. Player signed June 29, 1990.
The Houston Astros drafted Chris Hatcher in the 3rd round of the 1990 amateur draft. Player signed June 11, 1990.
The San Francisco Giants drafted Rick Huisman in the 3rd round of the 1990 amateur draft. Player signed June 11, 1990.
The Boston Red Sox drafted Walt McKeel in the 3rd round of the 1990 amateur draft. Player signed June 12, 1990.
The St. Louis Cardinals drafted Marc Ronan in the 3rd round of the 1990 amateur draft. Player signed June 21, 1990.
The California Angels drafted Garret Anderson in the 4th round of the 1990 amateur draft. Player signed June 16, 1990.
The Chicago White Sox drafted James Baldwin in the 4th round of the 1990 amateur draft. Player signed June 6, 1990.
The Montreal Expos drafted Jeff Barry in the 4th round of the 1990 amateur draft. Player signed June 5, 1990.
The Toronto Blue Jays drafted Howard Battle in the 4th round of the 1990 amateur draft. Player signed June 6, 1990.
The Los Angeles Dodgers drafted Mike Busch in the 4th round of the 1990 amateur draft. Player signed June 8, 1990.
Miami (Florida State) drafted Paul Carey in the 4th round of the 1990 amateur draft.
The San Francisco Giants drafted Mike Myers in the 4th round of the 1990 amateur draft. Player signed June 6, 1990.
The New York Yankees drafted Kirt Ojala in the 4th round of the 1990 amateur draft. Player signed June 5, 1990.
The Atlanta Braves drafted Joe Ayrault in the 5th round of the 1990 amateur draft. Player signed June 11, 1990.
The Seattle Mariners drafted Bret Boone in the 5th round of the 1990 amateur draft. Player signed June 8, 1990.
The Minnesota Twins drafted Brent Brede in the 5th round of the 1990 amateur draft. Player signed June 12, 1990.
The Baltimore Orioles drafted Bobby Chouinard in the 5th round of the 1990 amateur draft. Player signed June 4, 1990.
The Chicago White Sox drafted Ray Durham in the 5th round of the 1990 amateur draft. Player signed June 5, 1990.
The Cleveland Indians drafted Oscar Muñoz in the 5th round of the 1990 amateur draft.
The Texas Rangers drafted Jon Shave in the 5th round of the 1990 amateur draft. Player signed June 12, 1990.
The Milwaukee Brewers drafted Duane Singleton in the 5th round of the 1990 amateur draft. Player signed June 7, 1990.
The Detroit Tigers drafted Shannon Withem in the 5th round of the 1990 amateur draft. Player signed June 7, 1990.
The California Angels drafted Doug Creek in the 5th round of the 1990 amateur draft, but was not signed.
The Boston Red Sox drafted Gar Finnvold in the 6th round of the 1990 amateur draft.
The Cincinnati Reds drafted Steve Gibralter in the 6th round of the 1990 amateur draft. Player signed July 1, 1990.
The Oakland Athletics drafted Creighton Gubanich in the 6th round of the 1990 amateur draft. Player signed August 6, 1990.
The Seattle Mariners drafted Mike Hampton in the 6th round of the 1990 amateur draft. Player signed June 4, 1990.
Miami (Florida State) drafted Mike Lansing in the 6th round of the 1990 amateur draft. Player signed June 25, 1990.
The Milwaukee Brewers drafted Tom McGraw in the 6th round of the 1990 amateur draft. Player signed June 16, 1990.
The New York Yankees drafted Sam Militello in the 6th round of the 1990 amateur draft.
The California Angels drafted Troy Percival in the 6th round of the 1990 amateur draft. Player signed June 8, 1990.
The Cleveland Indians drafted Paul Bako in the 6th round of the 1990 amateur draft, but was not signed.
The Philadelphia Phillies drafted Joel Adamson in the 7th round of the 1990 amateur draft. Player signed June 26, 1990.
The St. Louis Cardinals drafted Scott Baker in the 7th round of the 1990 amateur draft. Player signed June 7, 1990.
The Cleveland Indians drafted David Bell in the 7th round of the 1990 amateur draft. Player signed June 12, 1990.
The Toronto Blue Jays drafted Scott Brow in the 7th round of the 1990 amateur draft. Player signed June 26, 1990.
The Texas Rangers drafted Terry Burrows in the 7th round of the 1990 amateur draft. Player signed June 7, 1990.
The Atlanta Braves drafted Ed Giovanola in the 7th round of the 1990 amateur draft. Player signed June 17, 1990.
The Seattle Mariners drafted Kevin King in the 7th round of the 1990 amateur draft.
The New York Yankees drafted Jalal Leach in the 7th round of the 1990 amateur draft. Player signed June 8, 1990.
The New York Mets drafted Pete Walker in the 7th round of the 1990 amateur draft. Player signed June 6, 1990.
The Pittsburgh Pirates drafted Kevin Young in the 7th round of the 1990 amateur draft. Player signed June 5, 1990.
The San Francisco Giants drafted Greg Norton in the 7th round of the 1990 amateur draft, but was not signed.
The New York Mets drafted Raúl Casanova in the 8th round of the 1990 amateur draft. Player signed June 11, 1990.
The Seattle Mariners drafted John Cummings in the 8th round of the 1990 amateur draft. Player signed June 8, 1990.
The Texas Rangers drafted Steve Dreyer in the 8th round of the 1990 amateur draft. Player signed June 6, 1990.
The Kansas City Royals drafted Phil Hiatt in the 8th round of the 1990 amateur draft. Player signed June 5, 1990.
The Cincinnati Reds drafted Larry Luebbers in the 8th round of the 1990 amateur draft. Player signed June 12, 1990.
The San Francisco Giants drafted Kevin McGehee in the 8th round of the 1990 amateur draft.
The Toronto Blue Jays drafted Paul Menhart in the 8th round of the 1990 amateur draft. Player signed June 6, 1990.
The Minnesota Twins drafted James Mouton in the 8th round of the 1990 amateur draft, but was not signed.
The St. Louis Cardinals drafted Terry Bradshaw in the 9th round of the 1990 amateur draft. Player signed June 15, 1990.
The Toronto Blue Jays drafted Huck Flener in the 9th round of the 1990 amateur draft. Player signed June 8, 1990.
The Atlanta Braves drafted Brian Kowitz in the 9th round of the 1990 amateur draft.
The Pittsburgh Pirates drafted Rich Robertson in the 9th round of the 1990 amateur draft. Player signed June 12, 1990.
The New York Mets drafted Fernando Viña in the 9th round of the 1990 amateur draft. Player signed June 11, 1990.
The Philadelphia Phillies drafted Derrick White in the 9th round of the 1990 amateur draft, but was not signed.
The Baltimore Orioles drafted Damon Buford in the 10th round of the 1990 amateur draft. Player signed July 12, 1990.
The Atlanta Braves drafted Tony Graffanino in the 10th round of the 1990 amateur draft. Player signed July 6, 1990.
The Texas Rangers drafted Rusty Greer in the 10th round of the 1990 amateur draft. Player signed June 5, 1990.
The Oakland Athletics drafted Ernie Young in the 10th round of the 1990 amateur draft. Player signed June 7, 1990.
The Houston Astros drafted Brian Boehringer in the 10th round of the 1990 amateur draft, but was not signed.
The Philadelphia Phillies drafted Gary Bennett in the 11th round of the 1990 amateur draft. Player signed June 12, 1990.
The New York Mets drafted Darren Dreifort in the 11th round of the 1990 amateur draft, but was not signed.
The San Diego Padres drafted Jay Powell in the 11th round of the 1990 amateur draft, but was not signed.
The Houston Astros drafted Jeff Ball in the 12th round of the 1990 amateur draft. Player signed June 22, 1990.
The Atlanta Braves drafted Brian Bark in the 12th round of the 1990 amateur draft.
The Milwaukee Brewers drafted Marshall Boze in the 12th round of the 1990 amateur draft.
The Chicago White Sox drafted Jimmy Hurst in the 12th round of the 1990 amateur draft. Player signed May 21, 1991.
The Minnesota Twins drafted Pat Meares in the 12th round of the 1990 amateur draft. Player signed June 9, 1990.
The Kansas City Royals drafted Rodney Myers in the 12th round of the 1990 amateur draft. Player signed August 2, 1990.
The Cincinnati Reds drafted John Roper in the 12th round of the 1990 amateur draft. Player signed June 10, 1990.
The Chicago Cubs drafted Pedro Valdés in the 12th round of the 1990 amateur draft. Player signed January 15, 1991.
The Chicago White Sox drafted Rod Bolton in the 13th round of the 1990 amateur draft. Player signed June 5, 1990.
The Texas Rangers drafted David Hulse in the 13th round of the 1990 amateur draft. Player signed June 5, 1990.
The Houston Astros drafted Ray Montgomery in the 13th round of the 1990 amateur draft. Player signed June 9, 1990.
The Pittsburgh Pirates drafted Brian Shouse in the 13th round of the 1990 amateur draft. Player signed June 8, 1990.
The St. Louis Cardinals drafted Tom Urbani in the 13th round of the 1990 amateur draft. Player signed June 11, 1990.
The Detroit Tigers drafted Charlie Greene in the 13th round of the 1990 amateur draft, but was not signed.
The Detroit Tigers drafted Ben Blomdahl in the 14th round of the 1990 amateur draft. Player signed May 28, 1991.
The San Diego Padres drafted Scott Fredrickson in the 14th round of the 1990 amateur draft. Player signed June 10, 1990.
The Pittsburgh Pirates drafted Jeff McCurry in the 14th round of the 1990 amateur draft. Player signed May 25, 1991.
The Philadelphia Phillies drafted Mike Williams in the 14th round of the 1990 amateur draft. Player signed June 9, 1990.
The Minnesota Twins drafted Jeff Granger in the 14th round of the 1990 amateur draft, but was not signed.
The Pittsburgh Pirates drafted Rick White in the 15th round of the 1990 amateur draft. Player signed June 7, 1990.
The New York Mets drafted Steve Soderstrom in the 15th round of the 1990 amateur draft, but was not signed.
The Seattle Mariners drafted Jim Converse in the 16th round of the 1990 amateur draft. Player signed June 11, 1990.
The Toronto Blue Jays drafted Mike Coolbaugh in the 16th round of the 1990 amateur draft. Player signed June 12, 1990.
The San Francisco Giants drafted Rikkert Faneyte in the 16th round of the 1990 amateur draft. Player signed March 19, 1991.
The Oakland Athletics drafted Doug Johns in the 16th round of the 1990 amateur draft. Player signed June 7, 1990.
The New York Yankees drafted Ricky Ledée in the 16th round of the 1990 amateur draft. Player signed June 5, 1990.
The Boston Red Sox drafted Erik Plantenberg in the 16th round of the 1990 amateur draft. Player signed June 17, 1990.
The Cincinnati Reds drafted Shane Halter in the 16th round of the 1990 amateur draft, but was not signed.
The New York Mets drafted Brian Daubach in the 17th round of the 1990 amateur draft. Player signed June 15, 1990.
The Kansas City Royals drafted Raúl González in the 17th round of the 1990 amateur draft. Player signed August 26, 1990.
The San Diego Padres drafted Matt Mieske in the 17th round of the 1990 amateur draft. Player signed June 10, 1990.
The Los Angeles Dodgers drafted Steve Mintz in the 17th round of the 1990 amateur draft. Player signed June 7, 1990.
The Cleveland Indians drafted Dave Mlicki in the 17th round of the 1990 amateur draft. Player signed June 20, 1990.
The California Angels drafted Mark Dalesandro in the 18th round of the 1990 amateur draft. Player signed June 8, 1990.
The Cleveland Indians drafted Steve Gajkowski in the 18th round of the 1990 amateur draft. Player signed June 7, 1990.
The Atlanta Braves drafted Mike Potts in the 18th round of the 1990 amateur draft. Player signed June 9, 1990.
The Seattle Mariners drafted Albie Lopez in the 19th round of the 1990 amateur draft, but was not signed.
The California Angels drafted P.J. Forbes in the 20th round of the 1990 amateur draft. Player signed June 7, 1990.
The Pittsburgh Pirates drafted Mark Johnson in the 20th round of the 1990 amateur draft. Player signed June 6, 1990.
The New York Yankees drafted Kevin Jordan in the 20th round of the 1990 amateur draft. Player signed June 8, 1990.
The Minnesota Twins drafted Damian Miller in the 20th round of the 1990 amateur draft. Player signed June 8, 1990.
The Philadelphia Phillies drafted Marvin Benard in the 20th round of the 1990 amateur draft, but was not signed.
The Cincinnati Reds drafted Marc Valdes in the 20th round of the 1990 amateur draft, but was not signed.
The California Angels drafted Ken Edenfield in the 21st round of the 1990 amateur draft. Player signed June 12, 1990.
The Minnesota Twins drafted Eddie Guardado in the 21st round of the 1990 amateur draft. Player signed May 23, 1991.
The Philadelphia Phillies drafted B.J. Waszgis in the 21st round of the 1990 amateur draft, but was not signed.
The Baltimore Orioles drafted Scott McClain in the 22nd round of the 1990 amateur draft. Player signed June 7, 1990.
The Oakland Athletics drafted Izzy Molina in the 22nd round of the 1990 amateur draft. Player signed June 28, 1990.
The New York Yankees drafted Andy Pettitte in the 22nd round of the 1990 amateur draft. Player signed May 25, 1991.
The San Diego Padres drafted Jon Ratliff in the 22nd round of the 1990 amateur draft, but was not signed.
The Oakland Athletics drafted Tanyon Sturtze in the 23rd round of the 1990 amateur draft. Player signed June 6, 1990.
The New York Yankees drafted Tom Wilson in the 23rd round of the 1990 amateur draft. Player signed May 21, 1991.
The St. Louis Cardinals drafted Duff Brumley in the 24th round of the 1990 amateur draft.
The San Diego Padres drafted Jay Gainer in the 24th round of the 1990 amateur draft. Player signed June 10, 1990.
The Los Angeles Dodgers drafted Michael Mimbs in the 24th round of the 1990 amateur draft. Player signed June 11, 1990.
The Pittsburgh Pirates drafted Keith Osik in the 24th round of the 1990 amateur draft. Player signed July 17, 1990.
The New York Yankees drafted Jorge Posada in the 24th round of the 1990 amateur draft. Player signed May 24, 1991.
The New York Yankees drafted Matt Dunbar in the 25th round of the 1990 amateur draft. Player signed June 9, 1990.
The San Diego Padres drafted Lance Painter in the 25th round of the 1990 amateur draft. Player signed June 6, 1990.
The Texas Rangers drafted Matt Whiteside in the 25th round of the 1990 amateur draft. Player signed June 7, 1990.
The Houston Astros drafted Jim Dougherty in the 26th round of the 1990 amateur draft. Player signed March 20, 1991.
The Boston Red Sox drafted Les Norman in the 26th round of the 1990 amateur draft, but was not signed.
The Montreal Expos drafted Billy Brewer in the 28th round of the 1990 amateur draft. Player signed June 12, 1990.
The New York Yankees drafted Shane Spencer in the 28th round of the 1990 amateur draft. Player signed June 7, 1990.
The San Francisco Giants drafted Lou Pote in the 29th round of the 1990 amateur draft. Player signed May 14, 1991.
The New York Mets drafted Will Brunson in the 29th round of the 1990 amateur draft, but was not signed.
The Houston Astros drafted Bret Hemphill in the 29th round of the 1990 amateur draft, but was not signed.
The Kansas City Royals drafted Brian Bevil in the 30th round of the 1990 amateur draft. Player signed May 14, 1991.
The Baltimore Orioles drafted Robin Jennings in the 30th round of the 1990 amateur draft, but was not signed.
The California Angels drafted Dave Berg in the 32nd round of the 1990 amateur draft, but was not signed.
The Baltimore Orioles drafted Jim Dedrick in the 33rd round of the 1990 amateur draft. Player signed June 7, 1990.
The Kansas City Royals drafted Brad Holman in the 35th round of the 1990 amateur draft.
The Oakland Athletics drafted T.J. Mathews in the 35th round of the 1990 amateur draft, but was not signed.
The New York Yankees drafted Kevin Ohme in the 35th round of the 1990 amateur draft, but was not signed.
The Atlanta Braves drafted Scott Watkins in the 35th round of the 1990 amateur draft, but was not signed.
The Chicago White Sox drafted Jason Bere in the 36th round of the 1990 amateur draft. Player signed June 6, 1990.
The Toronto Blue Jays drafted Ricardo Jordan in the 37th round of the 1990 amateur draft. Player signed June 22, 1990.
The Oakland Athletics drafted Todd Revenig in the 37th round of the 1990 amateur draft. Player signed June 9, 1990.
The New York Mets drafted Andrew Lorraine in the 38th round of the 1990 amateur draft, but was not signed.
The Los Angeles Dodgers drafted Mark Sweeney in the 39th round of the 1990 amateur draft, but was not signed.
The Atlanta Braves drafted Jason Wood in the 39th round of the 1990 amateur draft, but was not signed.
The Minnesota Twins drafted Brian Raabe in the 41st round of the 1990 amateur draft. Player signed June 8, 1990.
The New York Yankees drafted John Wasdin in the 41st round of the 1990 amateur draft, but was not signed.
The Oakland Athletics drafted Sean Lowe in the 43rd round of the 1990 amateur draft, but was not signed.
The Toronto Blue Jays drafted Travis Baptist in the 45th round of the 1990 amateur draft. Player signed August 14, 1990.
The New York Mets drafted Ricky Otero in the 45th round of the 1990 amateur draft. Player signed September 10, 1990.
The Chicago White Sox drafted Allen Battle in the 45th round of the 1990 amateur draft, but was not signed.
The San Diego Padres drafted Alan Benes in the 49th round of the 1990 amateur draft, but was not signed.
The New York Mets drafted Rick Helling in the 50th round of the 1990 amateur draft, but was not signed.
The Cleveland Indians drafted Carlos Crawford in the 51st round of the 1990 amateur draft. Player signed June 18, 1990.
The Detroit Tigers drafted Willie Adams in the 52nd round of the 1990 amateur draft, but was not signed.
The St. Louis Cardinals drafted Bart Evans in the 53rd round of the 1990 amateur draft, but was not signed.
The Los Angeles Dodgers drafted Todd Williams in the 54th round of the 1990 amateur draft. Player signed May 21, 1991.
The Atlanta Braves drafted Kelly Wunsch in the 54th round of the 1990 amateur draft, but was not signed.
The Houston Astros drafted Travis Driskill in the 76th round of the 1990 amateur draft, but was not signed.
The Houston Astros drafted Danny Young in the 83rd round of the 1990 amateur draft. Player signed May 10, 1991.
- June 5, 1990
The Boston Red Sox released Bill Buckner.
- June 6, 1990
The California Angels released Mark Clear.
The Cleveland Indians released Chris Howard.
The Milwaukee Brewers traded Frank Bolick to the Seattle Mariners for Mickey Brantley.
- June 8, 1990
The Boston Red Sox sent Rich Gedman to the Houston Astros as part of a conditional deal.
The San Francisco Giants signed Mike Davis as a free agent.
- June 9, 1990
The Detroit Tigers signed Steve Lombardozzi as a free agent.
The Cleveland Indians released Doug Sisk.
The Cincinnati Reds traded Ron Robinson and Bob Sebra to the Milwaukee Brewers for Billy Bates and Glenn Braggs.
- June 11, 1990
The Chicago Cubs signed Doug Strange as a free agent.
- June 12, 1990
The New York Mets signed Doug Sisk as a free agent.
- June 13, 1990
The Detroit Tigers signed John Shelby as a free agent.
The California Angels signed Darryl Scott as an amateur free agent.
Louie Meadows of the Houston Astros granted free agency.
- June 14, 1990
The Texas Rangers signed Randy St. Claire as a free agent.
The New York Mets released Shawn Barton.
- June 15, 1990
The Milwaukee Brewers signed Jeff Schwarz as a free agent.
Darryl Motley sent from the Cincinnati Reds to the Texas Rangers in an unknown transaction. (Date given is approximate. Exact date is uncertain.)
- June 16, 1990
The San Francisco Giants released Mike Davis.
- June 17, 1990
The Cleveland Indians purchased Ken Phelps from the Oakland Athletics.
- June 18, 1990
The Detroit Tigers traded Tracy Jones to the Seattle Mariners for Darnell Coles.
The Montreal Expos selected Rolando Roomes off waivers from the Cincinnati Reds.
The Toronto Blue Jays selected Ken Williams off waivers from the Detroit Tigers.
- June 19, 1990
The Atlanta Braves signed Shawn Barton as a free agent.
The Oakland Athletics signed Steve Phoenix as an amateur free agent.
The New York Mets traded Brian Givens to the Seattle Mariners for Mario Díaz.
- June 21, 1990
The Milwaukee Brewers signed Jim Tatum as a free agent.
The Kansas City Royals released Richard Dotson.
- June 22, 1990
The Chicago Cubs signed Mark Clear as a free agent.
The Minnesota Twins released Jim Dwyer.
- June 23, 1990
The San Francisco Giants released Ernie Camacho.
- June 24, 1990
The San Francisco Giants signed Rick Rodriguez as a free agent.
- June 25, 1990
The Baltimore Orioles traded Jay Tibbs to the Pittsburgh Pirates for a player to be named later. The Pittsburgh Pirates sent Dorn Taylor (September 5, 1990) to the Baltimore Orioles to complete the trade.
- June 26, 1990
The San Francisco Giants released Bob Knepper.
- June 28, 1990
The Baltimore Orioles signed John O'Donoghue as an amateur free agent.
- July 2, 1990
The St. Louis Cardinals signed Ernie Camacho as a free agent.
The Montreal Expos signed Israel Alcántara as an amateur free agent.
The Montreal Expos signed Ugueth Urbina as an amateur free agent.
- July 3, 1990
The Montreal Expos signed Jolbert Cabrera as an amateur free agent.
The Texas Rangers signed Hanley Frias as an amateur free agent.
The Baltimore Orioles released Greg Walker.
- July 4, 1990
The Philadelphia Phillies signed Louie Meadows as a free agent.
- July 7, 1990
The Pittsburgh Pirates signed Jerry Reuss as a free agent.
The Cleveland Indians released Eddie Zambrano.
- July 11, 1990
The Cleveland Indians traded Tom Lampkin to the San Diego Padres for Alex Cole.
- July 12, 1990
The Detroit Tigers released Matt Kinzer.
The Milwaukee Brewers traded Greg Edge (minors) to the Pittsburgh Pirates for Jim Czajkowski.
The Atlanta Braves traded Derek Lilliquist to the San Diego Padres for Mark Grant.
- July 15, 1990
The Oakland Athletics released Mike Norris.
The Detroit Tigers released Ed Romero.
- July 16, 1990
The Montreal Expos signed Rich Sauveur as a free agent.
- July 21, 1990
The Texas Rangers released John Hoover.
- July 22, 1990
The Toronto Blue Jays released Tom Lawless.
The Atlanta Braves traded Tony Valle (minors) to the New York Mets for Doug Sisk.
- July 23, 1990
The Atlanta Braves released Charlie Kerfeld.
The Atlanta Braves traded Joe Boever to the Philadelphia Phillies for Marvin Freeman.
- July 24, 1990
The Atlanta Braves released Joe Hesketh.
The Pittsburgh Pirates released Walt Terrell.
- July 25, 1990
The St. Louis Cardinals released Ricky Horton.
- July 27, 1990
The Atlanta Braves signed Charlie Kerfeld as a free agent.
The Houston Astros released Alex Treviño.
The Minnesota Twins traded John Candelaria to the Toronto Blue Jays for Nelson Liriano and Pedro Muñoz.
The Boston Red Sox traded a player to be named later, Ed Perozo (minors) and Greg Hansell to the New York Mets for Mike Marshall. The Boston Red Sox sent Paul Williams (minors) (November 19, 1990) to the New York Mets to complete the trade.
- July 28, 1990
The Detroit Tigers signed Walt Terrell as a free agent.
- July 30, 1990
The Baltimore Orioles traded Phil Bradley to the Chicago White Sox for Ron Kittle.
- July 31, 1990
The Boston Red Sox signed Joe Hesketh as a free agent.
The Atlanta Braves released Shawn Barton.
The Cleveland Indians released Steve Springer.
- August 1, 1990
The San Diego Padres signed Steve Springer as a free agent.
The Oakland Athletics released Ron Coomer.
The Baltimore Orioles selected Dave Gallagher off waivers from the Chicago White Sox.
- August 2, 1990
The Boston Red Sox purchased Wayne Housie from Salinas (California).
- August 3, 1990
The Baltimore Orioles signed Matt Kinzer as a free agent.
The New York Mets signed Alex Treviño as a free agent.
The Atlanta Braves traded a player to be named later and Dale Murphy to the Philadelphia Phillies for players to be named later and Jeff Parrett. The Atlanta Braves sent Tommy Greene (August 9, 1990) to the Philadelphia Phillies to complete the trade. The Philadelphia Phillies sent Jim Vatcher (August 9, 1990) and Víctor Rosario (September 4, 1990) to the Atlanta Braves to complete the trade.
- August 8, 1990
The San Francisco Giants purchased Jay Aldrich from the Baltimore Orioles.
The Minnesota Twins released Fred Manrique.
The Montreal Expos traded Zane Smith to the Pittsburgh Pirates for a player to be named later, Willie Greene and Scott Ruskin. The Pittsburgh Pirates sent Moisés Alou (August 16, 1990) to the Montreal Expos to complete the trade.
- August 10, 1990
The Milwaukee Brewers signed Ricky Horton as a free agent.
- August 11, 1990
The Montreal Expos released Wallace Johnson.
- August 12, 1990
The Cleveland Indians released Cecilio Guante.
The San Francisco Giants released Atlee Hammaker.
The Boston Red Sox released Jerry Reed.
- August 14, 1990
The Baltimore Orioles released Matt Kinzer.
- August 15, 1990
The Atlanta Braves purchased Armando Reynoso from Saltillo (Mexican).
- August 16, 1990
The Atlanta Braves signed Billy Taylor as a free agent.
- August 17, 1990
The California Angels traded a player to be named later to the Cleveland Indians for Ron Tingley. The California Angels sent Mark McLemore (August 17, 1990) to the Cleveland Indians to complete the trade.
- August 18, 1990
The Montreal Expos signed John Hoover as a free agent.
- August 21, 1990
The Houston Astros signed Bobby Abreu as an amateur free agent.
- August 23, 1990
The Boston Red Sox signed Cecilio Guante as a free agent.
- August 24, 1990
The San Diego Padres signed Atlee Hammaker as a free agent.
The Los Angeles Dodgers signed Omar Daal as an amateur free agent.
The Cincinnati Reds released Ken Griffey.
- August 25, 1990
The Minnesota Twins signed Cory Lidle as an amateur free agent.
- August 26, 1990
The Seattle Mariners signed Arquimedez Pozo as an amateur free agent.
- August 28, 1990
The Oakland Athletics signed Wallace Johnson as a free agent.
The Houston Astros released Brian Fisher.
The Atlanta Braves released Doug Sisk.
- August 29, 1990
The Seattle Mariners signed Ken Griffey as a free agent.
The Texas Rangers traded Harold Baines to the Oakland Athletics for players to be named later. The Oakland Athletics sent Joe Bitker (September 4, 1990) and Scott Chiamparino (September 4, 1990) to the Texas Rangers to complete the trade.
The Oakland Athletics traded Daryl Green (minors), Félix José and Stan Royer to the St. Louis Cardinals for Willie McGee.
The Baltimore Orioles selected Brian Dubois off waivers from the Detroit Tigers.
- August 30, 1990
The New York Mets traded Rocky Elli (minors) and Nikco Riesgo to the Philadelphia Phillies for Tom Herr.
The Boston Red Sox traded Jeff Bagwell to the Houston Astros for Larry Andersen.
The Houston Astros traded Bill Doran to the Cincinnati Reds for players to be named later. The Cincinnati Reds sent Terry McGriff (September 7, 1990), Keith Kaiser (minors) (September 7, 1990) and Butch Henry (September 7, 1990) to the Houston Astros to complete the trade.
The Philadelphia Phillies traded Carmelo Martínez to the Pittsburgh Pirates for a player to be named later, Wes Chamberlain and Julio Peguero. The Pittsburgh Pirates sent Tony Longmire (September 28, 1990) to the Philadelphia Phillies to complete the trade.
The Milwaukee Brewers traded a player to be named later and Charlie O'Brien to the New York Mets for players to be named later. The New York Mets sent Julio Machado (September 7, 1990) and Kevin Brown (September 7, 1990) to the Milwaukee Brewers to complete the trade. The Milwaukee Brewers sent Kevin Carmody (minors) (September 11, 1990) to the New York Mets to complete the trade.
The Kansas City Royals traded Pat Tabler to the New York Mets for Archie Corbin.
The Montreal Expos selected Orlando Mercado off waivers from the New York Mets.
- August 31, 1990
Mark Bailey of the San Francisco Giants granted free agency.
- September 1, 1990
The Chicago Cubs traded Greg Kallevig (minors) to the Pittsburgh Pirates for Randy Kramer.
- September 4, 1990
José Segura of the Chicago White Sox granted free agency.
The New York Mets released Barry Lyons.
The Texas Rangers released Randy St. Claire.
The Montreal Expos released Rich Thompson.
The Montreal Expos selected Kevin Bearse off waivers from the Cleveland Indians.
- September 5, 1990
The Milwaukee Brewers released Ricky Horton.
- September 6, 1990
The New York Mets signed Ramón Tatís as an amateur free agent.
- September 7, 1990
The New York Mets signed Guillermo Mota as an amateur free agent.
The Chicago Cubs traded Lloyd McClendon to the Pittsburgh Pirates for a player to be named later. The Pittsburgh Pirates sent Mike Pomeranz (minors) (September 28, 1990) to the Chicago Cubs to complete the trade.
The Cincinnati Reds selected Alex Treviño off waivers from the New York Mets.
- September 10, 1990
The Houston Astros traded Dan Schatzeder to the New York Mets for Nick Davis (minors) and Steve Larose (minors).
- September 13, 1990
The Los Angeles Dodgers traded Darrin Fletcher to the Philadelphia Phillies for Dennis Cook.
- September 16, 1990
The Cleveland Indians traded Bud Black to the Toronto Blue Jays for players to be named later and Mauro Gozzo. The Toronto Blue Jays sent Steve Cummings (September 21, 1990) and Alex Sanchez (September 24, 1990) to the Cleveland Indians to complete the trade.
- September 17, 1990
The Montreal Expos signed José Paniagua as an amateur free agent.
- September 18, 1990
The Seattle Mariners released Rick Renteria.
- September 20, 1990
The Los Angeles Dodgers signed Miguel Cairo as an amateur free agent.
Donell Nixon of the Baltimore Orioles granted free agency.
- September 21, 1990
The Los Angeles Dodgers signed Barry Lyons as a free agent.
The Chicago Cubs released Mark Clear.
The Chicago Cubs released Tom Thobe.
- September 24, 1990
The Toronto Blue Jays signed Rich Butler as an amateur free agent.
The Toronto Blue Jays signed Rob Butler as an amateur free agent.
The New York Yankees released Deion Sanders.
The Toronto Blue Jays selected Rick Luecken off waivers from the Atlanta Braves.
- September 27, 1990
The San Francisco Giants signed Mark Bailey as a free agent.
The Seattle Mariners released Mike Brumley.
- September 30, 1990
The Detroit Tigers released Jody Davis.
The Detroit Tigers traded Mike Wilkins (minors) to the Los Angeles Dodgers for Mike Munoz.
- October 1, 1990
The Philadelphia Phillies released Tommy Barrett.
The Milwaukee Brewers released Bob Sebra.
- October 3, 1990
Paul Noce of the Cincinnati Reds granted free agency.
Israel Sánchez of the Kansas City Royals granted free agency.
The San Francisco Giants released Randy O'Neal.
The Montreal Expos released Johnny Paredes.
- October 4, 1990
Jay Baller of the Kansas City Royals granted free agency.
Eric Bell of the Baltimore Orioles granted free agency.
Mike Capel of the Milwaukee Brewers granted free agency.
Jimmy Jones of the New York Yankees granted free agency.
Jeff Kaiser of the Cleveland Indians granted free agency.
Jim Lindeman of the Detroit Tigers granted free agency.
The San Francisco Giants released Bill Bathe.
The Kansas City Royals released Chris Codiroli.
The Kansas City Royals released Pete Filson.
The Houston Astros released Bill Gullickson.
The Cleveland Indians released Al Nipper.
The Kansas City Royals released Rey Palacios.
The New York Yankees released Claudell Washington.
- October 5, 1990
The Cleveland Indians signed Einar Díaz as an amateur free agent.
Tom Brunansky of the Boston Red Sox granted free agency.
Brad Komminsk of the Baltimore Orioles granted free agency.
Matt Sinatro of the Seattle Mariners granted free agency.
The New York Yankees released Wayne Tolleson.
- October 8, 1990
Don Aase of the Los Angeles Dodgers granted free agency.
- October 9, 1990
John Morris of the St. Louis Cardinals granted free agency.
- October 10, 1990
The Baltimore Orioles released Dorn Taylor.
- October 11, 1990
Brad Moore of the Philadelphia Phillies granted free agency.
Scott Service of the Philadelphia Phillies granted free agency.
The St. Louis Cardinals released Ernie Camacho.
The St. Louis Cardinals released Stan Clarke.
The California Angels released Bill Schroeder.
- October 12, 1990
The Cleveland Indians signed José Cabrera as an amateur free agent.
William Brennan of the Houston Astros granted free agency.
Rick Wrona of the Chicago Cubs granted free agency.
The Seattle Mariners released Jeffrey Leonard.
- October 14, 1990
The Cleveland Indians signed Eric Bell as a free agent.
- October 15, 1990
Jay Aldrich of the San Francisco Giants granted free agency.
Rich Amaral of the Chicago White Sox granted free agency.
Doug Baker of the Minnesota Twins granted free agency.
Skeeter Barnes of the Cincinnati Reds granted free agency.
Chris Beasley of the California Angels granted free agency.
Kevin Blankenship of the Chicago Cubs granted free agency.
Edgar Cáceres of the Chicago White Sox granted free agency.
Mike Campbell of the Chicago White Sox granted free agency.
Sherman Corbett of the California Angels granted free agency.
Mike Dalton of the Boston Red Sox granted free agency.
Doug Davis of the California Angels granted free agency.
John Davis of the San Diego Padres granted free agency.
Drew Denson of the Atlanta Braves granted free agency.
Mario Díaz of the New York Mets granted free agency.
José Escobar of the Toronto Blue Jays granted free agency.
Cecil Espy of the Texas Rangers granted free agency.
Jeff Fassero of the Cleveland Indians granted free agency.
Steve Fireovid of the Montreal Expos granted free agency.
Curt Ford of the Philadelphia Phillies granted free agency.
Todd Frohwirth of the Philadelphia Phillies granted free agency.
Dan Gakeler of the Montreal Expos granted free agency.
Webster Garrison of the Toronto Blue Jays granted free agency.
Brian Giles of the Seattle Mariners granted free agency.
Tom Gilles of the Toronto Blue Jays granted free agency.
Brian Holton of the Baltimore Orioles granted free agency.
John Hoover of the Montreal Expos granted free agency.
Mark Huismann of the Pittsburgh Pirates granted free agency.
Chuck Jackson of the San Francisco Giants granted free agency.
Wallace Johnson of the Oakland Athletics granted free agency.
Charlie Kerfeld of the Atlanta Braves granted free agency.
Wayne Kirby of the Los Angeles Dodgers granted free agency.
Kevin Koslofski of the Kansas City Royals granted free agency.
Rick Lancellotti of the Boston Red Sox granted free agency.
Dave Leiper of the Oakland Athletics granted free agency.
Dave Liddell of the New York Mets granted free agency.
Steve Lombardozzi of the Detroit Tigers granted free agency.
Vance Lovelace of the Seattle Mariners granted free agency.
Urbano Lugo of the Detroit Tigers granted free agency.
Mitch Lyden of the New York Yankees granted free agency.
Mike Maddux of the Los Angeles Dodgers granted free agency.
Ravelo Manzanillo of the Chicago White Sox granted free agency.
Chito Martínez of the Kansas City Royals granted free agency.
Scott May of the Milwaukee Brewers granted free agency.
Louie Meadows of the Philadelphia Phillies granted free agency.
Tony Menéndez of the Chicago White Sox granted free agency.
Rob Nelson of the San Diego Padres granted free agency.
Tom Nieto of the Philadelphia Phillies granted free agency.
Dickie Noles of the Philadelphia Phillies granted free agency.
Yorkis Pérez of the Montreal Expos granted free agency.
Alonzo Powell of the Minnesota Twins granted free agency.
Dennis Powell of the Milwaukee Brewers granted free agency.
Joe Redfield of the Milwaukee Brewers granted free agency.
Rich Sauveur of the Montreal Expos granted free agency.
Tim Scott of the Los Angeles Dodgers granted free agency.
Danny Sheaffer of the Pittsburgh Pirates granted free agency.
Pat Sheridan of the Chicago Cubs granted free agency.
Dar Smith of the Kansas City Royals granted free agency.
Steve Springer of the San Diego Padres granted free agency.
Lou Thornton of the New York Mets granted free agency.
Jay Tibbs of the Pittsburgh Pirates granted free agency.
Ron Tingley of the California Angels granted free agency.
José Tolentino of the Houston Astros granted free agency.
Freddie Toliver of the California Angels granted free agency.
Kelvin Torve of the New York Mets granted free agency.
Greg Tubbs of the Pittsburgh Pirates granted free agency.
Ed Vosberg of the San Francisco Giants granted free agency.
Jim Walewander of the New York Yankees granted free agency.
Kevin Ward of the Oakland Athletics granted free agency.
Carl Willis of the Cleveland Indians granted free agency.
Paul Zuvella of the Kansas City Royals granted free agency.
Hanshin Tigers (Japan Central) purchased Tom O'Malley from the New York Mets.
The Atlanta Braves released Ernie Whitt.
- October 16, 1990
Greg Mathews of the St. Louis Cardinals granted free agency.
The Milwaukee Brewers released Mike Birkbeck.
The Milwaukee Brewers released Tom Filer.
- October 19, 1990
Danny Cox of the St. Louis Cardinals granted free agency.
- October 20, 1990
John Cangelosi of the Pittsburgh Pirates granted free agency.
- October 22, 1990
John Russell of the Texas Rangers granted free agency.
The Cleveland Indians released Keith Shepherd.
- October 24, 1990
The Toronto Blue Jays released Jim Eppard.
The Boston Red Sox released Dwight Evans.
- October 25, 1990
The San Francisco Giants released Mike Laga.
- October 26, 1990
Curt Wilkerson of the Chicago Cubs granted free agency.
The Toronto Blue Jays released Rick Luecken.
- October 29, 1990
Hanshin Tigers (Japan Central) purchased Marvell Wynne from the Chicago Cubs.
- October 30, 1990
The Cleveland Indians released Dion James.
- November 1, 1990
The San Diego Padres signed Tim Scott as a free agent.
The Montreal Expos released Scott Anderson.
- November 2, 1990
The Milwaukee Brewers signed Rick Wrona as a free agent.
- November 5, 1990
The Seattle Mariners signed Matt Sinatro as a free agent.
Juan Agosto of the Houston Astros granted free agency.
Wally Backman of the Pittsburgh Pirates granted free agency.
Doug Bair of the Pittsburgh Pirates granted free agency.
George Bell of the Toronto Blue Jays granted free agency.
Rafael Belliard of the Pittsburgh Pirates granted free agency.
Bud Black of the Toronto Blue Jays granted free agency.
Mike Boddicker of the Boston Red Sox granted free agency.
Bob Boone of the Kansas City Royals granted free agency.
Phil Bradley of the Chicago White Sox granted free agency.
Sid Bream of the Pittsburgh Pirates granted free agency.
Tom Brookens of the Cleveland Indians granted free agency.
Tom Browning of the Cincinnati Reds granted free agency.
Randy Bush of the Minnesota Twins granted free agency.
John Candelaria of the Toronto Blue Jays granted free agency.
Don Carman of the Philadelphia Phillies granted free agency.
Gary Carter of the San Francisco Giants granted free agency.
Vince Coleman of the St. Louis Cardinals granted free agency.
Darnell Coles of the Detroit Tigers granted free agency.
Steve Crawford of the Kansas City Royals granted free agency.
Ken Dayley of the St. Louis Cardinals granted free agency.
Rob Deer of the Milwaukee Brewers granted free agency.
Rick Dempsey of the Los Angeles Dodgers granted free agency.
Bill Doran of the Cincinnati Reds granted free agency.
Brian Downing of the California Angels granted free agency.
Steve Farr of the Kansas City Royals granted free agency.
Rich Gedman of the Houston Astros granted free agency.
Kirk Gibson of the Los Angeles Dodgers granted free agency.
Ken Griffey of the Seattle Mariners granted free agency.
Kevin Gross of the Montreal Expos granted free agency.
Ron Hassey of the Oakland Athletics granted free agency.
Mickey Hatcher of the Los Angeles Dodgers granted free agency.
Danny Heep of the Boston Red Sox granted free agency.
Teddy Higuera of the Milwaukee Brewers granted free agency.
Charlie Hough of the Texas Rangers granted free agency.
Danny Jackson of the Cincinnati Reds granted free agency.
Steve Jeltz of the Kansas City Royals granted free agency.
Bill Krueger of the Milwaukee Brewers granted free agency.
Tim Leary of the New York Yankees granted free agency.
Fred Lynn of the San Diego Padres granted free agency.
Rick Mahler of the Cincinnati Reds granted free agency.
Candy Maldonado of the Cleveland Indians granted free agency.
Andy McGaffigan of the Kansas City Royals granted free agency.
Willie McGee of the Oakland Athletics granted free agency.
Craig McMurtry of the Texas Rangers granted free agency.
Greg Minton of the California Angels granted free agency.
Paul Mirabella of the Milwaukee Brewers granted free agency.
John Moses of the Minnesota Twins granted free agency.
Rance Mulliniks of the Toronto Blue Jays granted free agency.
Tom Niedenfuer of the St. Louis Cardinals granted free agency.
Ed Núñez of the Detroit Tigers granted free agency.
Ron Oester of the Cincinnati Reds granted free agency.
Mike Pagliarulo of the San Diego Padres granted free agency.
Terry Pendleton of the St. Louis Cardinals granted free agency.
Gerald Perry of the Kansas City Royals granted free agency.
Dan Petry of the Detroit Tigers granted free agency.
Ken Phelps of the Cleveland Indians granted free agency.
Ted Power of the Pittsburgh Pirates granted free agency.
Jim Presley of the Atlanta Braves granted free agency.
Joe Price of the Baltimore Orioles granted free agency.
Terry Puhl of the Houston Astros granted free agency.
Willie Randolph of the Oakland Athletics granted free agency.
Dennis Rasmussen of the San Diego Padres granted free agency.
Gary Redus of the Pittsburgh Pirates granted free agency.
Jerry Reuss of the Pittsburgh Pirates granted free agency.
R.J. Reynolds of the Pittsburgh Pirates granted free agency.
Dave Righetti of the New York Yankees granted free agency.
Jeff Robinson of the New York Yankees granted free agency.
Juan Samuel of the Los Angeles Dodgers granted free agency.
Scott Sanderson of the Oakland Athletics granted free agency.
Dan Schatzeder of the New York Mets granted free agency.
Dave Schmidt of the Montreal Expos granted free agency.
Larry Sheets of the Detroit Tigers granted free agency.
John Shelby of the Detroit Tigers granted free agency.
Eric Show of the San Diego Padres granted free agency.
Don Slaught of the Pittsburgh Pirates granted free agency.
Zane Smith of the Pittsburgh Pirates granted free agency.
Darryl Strawberry of the New York Mets granted free agency.
Franklin Stubbs of the Houston Astros granted free agency.
Pat Tabler of the New York Mets granted free agency.
Mickey Tettleton of the Baltimore Orioles granted free agency.
Mark Thurmond of the San Francisco Giants granted free agency.
John Tudor of the St. Louis Cardinals granted free agency.
Fernando Valenzuela of the Los Angeles Dodgers granted free agency.
Max Venable of the California Angels granted free agency.
Denny Walling of the St. Louis Cardinals granted free agency.
Gary Ward of the Detroit Tigers granted free agency.
Bob Welch of the Oakland Athletics granted free agency.
Frank White of the Kansas City Royals granted free agency.
Glenn Wilson of the Houston Astros granted free agency.
Willie Wilson of the Kansas City Royals granted free agency.
Matt Young of the Seattle Mariners granted free agency.
The California Angels released Donnie Hill.
The Oakland Athletics released Jamie Quirk.
- November 6, 1990
The Cincinnati Reds signed Dave Liddell as a free agent.
The Atlanta Braves traded Nate Cromwell (minors) to the Toronto Blue Jays for Earl Sanders (minors).
The Cleveland Indians traded Alex Sanchez to the Toronto Blue Jays for Willie Blair.
- November 7, 1990
Danny Darwin of the Houston Astros granted free agency.
Gary Gaetti of the Minnesota Twins granted free agency.
- November 8, 1990
The Los Angeles Dodgers signed Darryl Strawberry as a free agent.
- November 9, 1990
The San Francisco Giants signed Bud Black as a free agent.
The Montreal Expos traded John Costello to the San Diego Padres for Brian Harrison (minors).
- November 11, 1990
The San Diego Padres signed Cameron Cairncross as an amateur free agent.
- November 13, 1990
The Seattle Mariners signed Giomar Guevara as an amateur free agent.
The Atlanta Braves released Marty Clary.
The Atlanta Braves released Dwayne Henry.
The New York Mets released Keith Hughes.
The New York Mets released Chris Jelic.
The Texas Rangers released Jamie Moyer.
- November 15, 1990
The Montreal Expos signed Scott Service as a free agent.
The Seattle Mariners signed Steve Springer as a free agent.
Gary Mielke of the Texas Rangers granted free agency.
Mike Stanley of the Texas Rangers granted free agency.
- November 16, 1990
The Baltimore Orioles signed Chito Martínez as a free agent.
Pat Perry of the Los Angeles Dodgers granted free agency.
- November 19, 1990
The Detroit Tigers signed Dan Gakeler as a free agent.
The New York Yankees signed Tim Leary as a free agent.
The New York Yankees released Brian Dorsett.
- November 20, 1990
The Pittsburgh Pirates signed Kevin Blankenship as a free agent.
Pat Clements of the San Diego Padres granted free agency.
Gary Eave of the San Francisco Giants granted free agency.
The Boston Red Sox released Jeff Stone.
- November 21, 1990
The Kansas City Royals signed Mike Boddicker as a free agent.
The Cincinnati Reds signed Tom Browning as a free agent.
The Chicago Cubs signed Danny Jackson as a free agent.
The New York Yankees signed Rubén Rivera as an amateur free agent.
The Atlanta Braves signed Esteban Yan as an amateur free agent.
- November 23, 1990
The Detroit Tigers signed Rob Deer as a free agent.
- November 25, 1990
The Seattle Mariners signed Rich Amaral as a free agent.
The Cleveland Indians signed José Escobar as a free agent.
- November 26, 1990
The Toronto Blue Jays signed Ken Dayley as a free agent.
The New York Yankees signed Steve Farr as a free agent.
The San Francisco Giants signed José Segura as a free agent.
The Detroit Tigers signed John Shelby as a free agent.
- November 28, 1990
The Oakland Athletics signed Jamie Quirk as a free agent.
- November 30, 1990
The Chicago White Sox released Jerry Willard.
- December, 1990
The Detroit Tigers signed Johnny Paredes as a free agent.
- December 1, 1990
The Kansas City Royals signed Kirk Gibson as a free agent.
- December 2, 1990
Alex Treviño of the Cincinnati Reds granted free agency.
Fukuoka Daiei Hawks (Japan Pacific) purchased Eddie Williams from the San Diego Padres.
The Minnesota Twins released Roy Smith.
The California Angels traded Willie Fraser, Marcus Moore and Devon White to the Toronto Blue Jays for a player to be named later, Junior Félix and Luis Sojo. The Toronto Blue Jays sent Ken Rivers (minors) (December 4, 1990) to the California Angels to complete the trade.
- December 3, 1990
The Minnesota Twins drafted Pat Howell from the New York Mets in the 1990 rule 5 draft.
The Cleveland Indians drafted Mike Huff from the Los Angeles Dodgers in the 1990 rule 5 draft.
The Montreal Expos drafted Greg McCarthy from the Philadelphia Phillies in the 1990 rule 5 draft.
The Montreal Expos drafted Nikco Riesgo from the Philadelphia Phillies in the 1990 rule 5 draft.
The San Diego Padres drafted Frank Seminara from the New York Yankees in the 1990 rule 5 draft.
The New York Mets drafted Doug Simons from the Minnesota Twins in the 1990 rule 5 draft.
The Oakland Athletics drafted Ed Taubensee from the Cincinnati Reds in the 1990 rule 5 draft.
The Houston Astros drafted Dean Wilkins from the Chicago Cubs in the 1990 rule 5 draft.
The Detroit Tigers drafted Buddy Groom from the Chicago White Sox in the 1990 minor league draft.
The Chicago Cubs drafted Russ McGinnis from the Oakland Athletics in the 1990 minor league draft.
The San Diego Padres drafted Craig Shipley from the New York Mets in the 1990 minor league draft.
The Los Angeles Dodgers signed Kevin Gross as a free agent.
The Detroit Tigers signed Bill Gullickson as a free agent.
The Cleveland Indians signed Wayne Kirby as a free agent.
The San Francisco Giants signed Willie McGee as a free agent.
The Atlanta Braves signed Terry Pendleton as a free agent.
The Oakland Athletics signed Willie Wilson as a free agent.
The Chicago Cubs released Kevin Coffman.
The Montreal Expos released Dale Mohorcic.
The Montreal Expos released Rolando Roomes.
The Kansas City Royals released Jeff Schulz.
The Baltimore Orioles released Mike Smith.
The New York Yankees traded Oscar Azócar to the San Diego Padres for a player to be named later. The San Diego Padres sent Mike Humphreys (February 7, 1991) to the New York Yankees to complete the trade.
- December 4, 1990
The Toronto Blue Jays signed Ravelo Manzanillo as a free agent.
The Toronto Blue Jays signed Rance Mulliniks as a free agent.
The Milwaukee Brewers signed Ed Núñez as a free agent.
The San Francisco Giants signed Dave Righetti as a free agent.
The Kansas City Royals signed Dan Schatzeder as a free agent.
The California Angels signed Ed Vosberg as a free agent.
The Boston Red Sox signed Matt Young as a free agent.
The Boston Red Sox released Billy Jo Robidoux.
The Baltimore Orioles traded Dave Gallagher to the California Angels for Mike Hook (minors) and Dave Martinez (minors).
The Chicago White Sox traded Shawn Hillegas and Eric King to the Cleveland Indians for Lindsay Foster (minors) and Cory Snyder.
The Oakland Athletics traded a player to be named later and Darren Lewis to the San Francisco Giants for Ernie Riles. The Oakland Athletics sent Pedro Pena (minors) (December 17, 1990) to the San Francisco Giants to complete the trade.
- December 5, 1990
The Detroit Tigers signed Tony Bernazard as a free agent.
The Atlanta Braves signed Sid Bream as a free agent.
The New York Mets signed Vince Coleman as a free agent.
The Cincinnati Reds signed Bill Doran as a free agent.
The Milwaukee Brewers signed Teddy Higuera as a free agent.
The Milwaukee Brewers signed Franklin Stubbs as a free agent.
The Toronto Blue Jays signed Pat Tabler as a free agent.
The Detroit Tigers released Mike Schwabe.
The Minnesota Twins traded a player to be named later and Johnny Ard (minors) to the San Francisco Giants for Steve Bedrosian. The Minnesota Twins sent Jimmy Williams (minors) (December 18, 1990) to the San Francisco Giants to complete the trade.
The San Diego Padres traded Roberto Alomar and Joe Carter to the Toronto Blue Jays for Tony Fernández and Fred McGriff.
- December 6, 1990
The Chicago Cubs signed George Bell as a free agent.
The Kansas City Royals signed Steve Crawford as a free agent.
The Baltimore Orioles signed Dwight Evans as a free agent.
The Pittsburgh Pirates signed Zane Smith as a free agent.
The California Angels signed Ron Tingley as a free agent.
The Milwaukee Brewers released Tony Fossas.
The Milwaukee Brewers released Gus Polidor.
- December 7, 1990
The California Angels signed Fred Manrique as a free agent.
Larry Andersen of the Boston Red Sox granted free agency.
Juan Berenguer of the Minnesota Twins granted free agency.
Brett Butler of the San Francisco Giants granted free agency.
Jack Clark of the San Diego Padres granted free agency.
Chili Davis of the California Angels granted free agency.
Mike Heath of the Detroit Tigers granted free agency.
Dave Henderson of the Oakland Athletics granted free agency.
Charlie Leibrandt of the Atlanta Braves granted free agency.
Jack Morris of the Detroit Tigers granted free agency.
Dave Smith of the Houston Astros granted free agency.
Mike Witt of the New York Yankees granted free agency.
- December 8, 1990
The Kansas City Royals signed Andy McGaffigan as a free agent.
- December 9, 1990
The New York Yankees signed Jim Walewander as a free agent.
- December 10, 1990
The Pittsburgh Pirates signed Gary Redus as a free agent.
The Oakland Athletics signed Eric Show as a free agent.
The Toronto Blue Jays signed Carlos Almánzar as an amateur free agent.
The Toronto Blue Jays signed Edwin Hurtado as an amateur free agent.
The Toronto Blue Jays signed Dilson Torres as an amateur free agent.
The Atlanta Braves traded Dennis Hood (minors) to the Seattle Mariners for Scott Taylor.
- December 11, 1990
The Oakland Athletics signed Dave Henderson as a free agent.
The Cincinnati Reds released Tim Birtsas.
- December 12, 1990
The California Angels signed Floyd Bannister as a free agent.
The Baltimore Orioles signed Todd Frohwirth as a free agent.
The Chicago White Sox signed Charlie Hough as a free agent.
The Minnesota Twins signed Carl Willis as a free agent.
The San Diego Padres traded Mark Parent to the Texas Rangers for Scott Coolbaugh.
- December 13, 1990
The St. Louis Cardinals signed Gerald Perry as a free agent.
The New York Mets signed Terry Puhl as a free agent.
The California Angels signed Max Venable as a free agent.
The Los Angeles Dodgers released Luis Lopez.
The Cleveland Indians released Mark McLemore.
- December 14, 1990
The St. Louis Cardinals signed Juan Agosto as a free agent.
The Los Angeles Dodgers signed Brett Butler as a free agent.
The Texas Rangers signed Mario Díaz as a free agent.
The Cincinnati Reds signed Ted Power as a free agent.
The Boston Red Sox released Marty Barrett.
The Chicago Cubs traded Greg Smith to the Los Angeles Dodgers for José Vizcaíno.
The Baltimore Orioles traded Mickey Weston to the Toronto Blue Jays for Paul Kilgus.
- December 15, 1990
The Boston Red Sox signed Jack Clark as a free agent.
The Oakland Athletics signed Bob Welch as a free agent.
Ron Kittle of the Baltimore Orioles granted free agency.
The Los Angeles Dodgers released Ray Searage.
The Los Angeles Dodgers traded Hubie Brooks to the New York Mets for Greg Hansell and Bob Ojeda.
The Boston Red Sox traded Wes Gardner to the San Diego Padres for Steve Hendricks (minors) and Brad Hoyer (minors).
- December 16, 1990
The Los Angeles Dodgers signed Juan Samuel as a free agent.
- December 17, 1990
The Philadelphia Phillies signed Danny Cox as a free agent.
The Seattle Mariners signed Ken Griffey as a free agent.
The Chicago Cubs signed Dave Smith as a free agent.
The Chicago Cubs released Randy Kramer.
- December 18, 1990
The Atlanta Braves signed Rafael Belliard as a free agent.
The Minnesota Twins signed Randy Bush as a free agent.
The Chicago Cubs released Bill Long.
- December 19, 1990
The Boston Red Sox signed Tom Brunansky as a free agent.
The Detroit Tigers signed Mike Dalton as a free agent.
The Boston Red Sox signed Danny Darwin as a free agent.
The Los Angeles Dodgers signed Mickey Hatcher as a free agent.
The California Angels signed Donnie Hill as a free agent.
The Seattle Mariners signed Bill Krueger as a free agent.
The Detroit Tigers signed Dan Petry as a free agent.
The Oakland Athletics signed Scott Sanderson as a free agent.
The Pittsburgh Pirates signed Don Slaught as a free agent.
The Baltimore Orioles signed Mickey Tettleton as a free agent.
The Los Angeles Dodgers signed Fernando Valenzuela as a free agent.
- December 20, 1990
The Milwaukee Brewers signed Mike Campbell as a free agent.
The Atlanta Braves signed Charlie Leibrandt as a free agent.
The Minnesota Twins signed Danny Sheaffer as a free agent.
Dann Bilardello of the Pittsburgh Pirates granted free agency.
John Cerutti of the Toronto Blue Jays granted free agency.
Jim Corsi of the Oakland Athletics granted free agency.
Tom Edens of the Milwaukee Brewers granted free agency.
Steve Howard of the Oakland Athletics granted free agency.
Lance McCullers of the Detroit Tigers granted free agency.
Jeff Musselman of the New York Mets granted free agency.
Dave Otto of the Oakland Athletics granted free agency.
Terry Wells of the Los Angeles Dodgers granted free agency.
The Oakland Athletics released Ozzie Canseco.
The California Angels released Johnny Ray.
The Los Angeles Dodgers traded Darren Holmes to the Milwaukee Brewers for Bert Heffernan.
The Pittsburgh Pirates selected Rosario Rodríguez off waivers from the Cincinnati Reds.
- December 21, 1990
The San Diego Padres signed Larry Andersen as a free agent.
The Pittsburgh Pirates signed Steve Fireovid as a free agent.
The Seattle Mariners signed Chuck Jackson as a free agent.
The Seattle Mariners signed Alonzo Powell as a free agent.
- December 22, 1990
The Pittsburgh Pirates signed Joe Redfield as a free agent.
- December 23, 1990
The Chicago White Sox traded Iván Calderón and Barry Jones to the Montreal Expos for a player to be named later, Jeff Carter and Tim Raines. The Montreal Expos sent Mario Brito (minors) (February 15, 1991) to the Chicago White Sox to complete the trade.
- December 30, 1990
The Los Angeles Dodgers traded Jim Poole and cash to the Texas Rangers for Steve Allen (minors) and Dave Lynch (minors).
- December 31, 1990
The New York Yankees purchased Scott Sanderson from the Oakland Athletics.
- Before 1991 Season
The Minnesota Twins signed Joey Meyer as a free agent.
- January 1, 1991
The Milwaukee Brewers signed Jeff Kaiser as a free agent.
The Baltimore Orioles signed Roy Smith as a free agent.
Esteban Beltré of the Montreal Expos granted free agency.
- January 2, 1991
The St. Louis Cardinals signed Alex Treviño as a free agent.
The New York Yankees signed Mike Witt as a free agent.
- January 3, 1991
The Montreal Expos signed Jeff Fassero as a free agent.
- January 5, 1991
The Houston Astros signed Mike Capel as a free agent.
- January 7, 1991
The New York Yankees signed Keith Hughes as a free agent.
The Oakland Athletics signed Vance Law as a free agent.
The Montreal Expos signed Tony Menéndez as a free agent.
- January 8, 1991
The San Diego Padres signed Marty Barrett as a free agent.
The Texas Rangers signed Craig McMurtry as a free agent.
The Chicago White Sox signed Rob Nelson as a free agent.
- January 9, 1991
The St. Louis Cardinals signed Jamie Moyer as a free agent.
The San Diego Padres signed Dennis Rasmussen as a free agent.
The Pittsburgh Pirates signed Curt Wilkerson as a free agent.
- January 10, 1991
The Philadelphia Phillies signed Wally Backman as a free agent.
The Philadelphia Phillies signed John Morris as a free agent.
The Cincinnati Reds signed Gus Polidor as a free agent.
The New York Mets signed Kelvin Torve as a free agent.
The Pittsburgh Pirates signed Eddie Zambrano as a free agent.
The Kansas City Royals signed Carlos Méndez as an amateur free agent.
The Baltimore Orioles traded Steve Finley, Pete Harnisch and Curt Schilling to the Houston Astros for Glenn Davis.
- January 11, 1991
The Philadelphia Phillies signed Jim Lindeman as a free agent.
The Cleveland Indians signed Luis Lopez as a free agent.
The Cleveland Indians signed Mitch Lyden as a free agent.
The Baltimore Orioles traded Mickey Tettleton to the Detroit Tigers for Jeff Robinson.
- January 13, 1991
The Atlanta Braves signed William Brennan as a free agent.
The Kansas City Royals signed Kevin Koslofski as a free agent.
The New York Yankees released Rick Cerone.
- January 14, 1991
The Detroit Tigers signed John Cerutti as a free agent.
The Minnesota Twins signed Tom Edens as a free agent.
The Oakland Athletics signed Webster Garrison as a free agent.
- January 15, 1991
The California Angels signed Chris Beasley as a free agent.
The San Diego Padres signed Dann Bilardello as a free agent.
The San Diego Padres signed Brian Dorsett as a free agent.
The Los Angeles Dodgers traded Kevin Campbell to the Oakland Athletics for Dave Veres.
The Baltimore Orioles traded Rene Gonzales to the Toronto Blue Jays for Rob Blumberg (minors).
- January 16, 1991
The Cleveland Indians signed Dave Otto as a free agent.
The Cleveland Indians traded Troy Neel to the Oakland Athletics for Larry Arndt.
- January 17, 1991
The California Angels signed Jeff Robinson as a free agent.
- January 18, 1991
The Kansas City Royals signed Andy Allanson as a free agent.
- January 19, 1991
The Atlanta Braves signed Jerry Willard as a free agent.
- January 20, 1991
The Cleveland Indians signed Ron Kittle as a free agent.
The San Diego Padres signed Melvin Rosario as an amateur free agent.
- January 21, 1991
The Detroit Tigers signed Skeeter Barnes as a free agent.
The New York Mets signed Rick Cerone as a free agent.
The Kansas City Royals signed Greg Mathews as a free agent.
The Chicago Cubs signed Scott May as a free agent.
The Kansas City Royals signed Paul Zuvella as a free agent.
The Detroit Tigers traded Dave Richards (minors) to the Seattle Mariners for Todd Haney.
- January 22, 1991
The Houston Astros signed Jay Baller as a free agent.
The Atlanta Braves signed Mike Heath as a free agent.
The Atlanta Braves signed Randy Kramer as a free agent.
The New York Mets signed Rich Sauveur as a free agent.
- January 23, 1991
The Boston Red Sox signed Mike Brumley as a free agent.
The Boston Red Sox signed Tony Fossas as a free agent.
The California Angels signed Gary Gaetti as a free agent.
- January 24, 1991
The New York Yankees signed Pat Sheridan as a free agent.
- January 25, 1991
The Texas Rangers signed Rich Gossage as a free agent.
The Oakland Athletics signed Brad Komminsk as a free agent.
The Minnesota Twins signed Mike Pagliarulo as a free agent.
The Pittsburgh Pirates signed Jeff Schulz as a free agent.
The Atlanta Braves signed Doug Sisk as a free agent.
- January 27, 1991
The Chicago White Sox signed Chris Howard as a free agent.
- January 28, 1991
The Pittsburgh Pirates signed Greg Tubbs as a free agent.
The San Diego Padres signed Kevin Ward as a free agent.
- January 29, 1991
The Atlanta Braves signed Juan Berenguer as a free agent.
The Minnesota Twins signed Chili Davis as a free agent.
- January 30, 1991
The Atlanta Braves signed Deion Sanders as a free agent.
- January 31, 1991
The Montreal Expos signed Bill Long as a free agent.
- February 1, 1991
The Boston Red Sox signed John Moses as a free agent.
The Atlanta Braves signed Yorkis Pérez as a free agent.
The Texas Rangers signed John Russell as a free agent.
The Atlanta Braves released Gerónimo Berroa.
- February 4, 1991
The Pittsburgh Pirates signed Mark Huismann as a free agent.
The Texas Rangers signed Mike Stanley as a free agent.
- February 5, 1991
The Minnesota Twins signed Jack Morris as a free agent.
- February 6, 1991
The Houston Astros signed Don Carman as a free agent.
- February 7, 1991
The Boston Red Sox signed Tommy Barrett as a free agent.
The Baltimore Orioles signed Benny Distefano as a free agent.
- February 8, 1991
The San Diego Padres signed Jim Presley as a free agent.
The Atlanta Braves signed Tracy Woodson as a free agent.
The Oakland Athletics signed Tony Batista as an amateur free agent.
The San Diego Padres selected Jim Vatcher off waivers from the Atlanta Braves.
- February 9, 1991
The San Diego Padres signed Pat Clements as a free agent.
- February 11, 1991
The Pittsburgh Pirates signed Cecil Espy as a free agent.
- February 13, 1991
The Atlanta Braves signed Glenn Wilson as a free agent.
- February 14, 1991
The San Diego Padres released Matt Maysey.
- February 15, 1991
The St. Louis Cardinals signed Rich Gedman as a free agent.
The Montreal Expos signed Ron Hassey as a free agent.
- February 17, 1991
The New York Yankees released Dave LaPoint.
- February 19, 1991
The Baltimore Orioles signed Dennis Powell as a free agent.
The New York Mets signed Edgardo Alfonzo as an amateur free agent.
- February 20, 1991
The Seattle Mariners signed Shawn Barton as a free agent.
- February 21, 1991
The New York Yankees signed Steve Howe as a free agent.
- February 23, 1991
Carlos Martínez of the Chicago White Sox granted free agency.
- February 27, 1991
The Seattle Mariners signed Gerónimo Berroa as a free agent.
The Montreal Expos signed Rick Mahler as a free agent.
- March 2, 1991
The Montreal Expos signed Mike Davis as a free agent.
- March 3, 1991
The Los Angeles Dodgers signed Roger Cedeño as an amateur free agent.
- March 4, 1991
The California Angels signed Freddie Toliver as a free agent.
- March 6, 1991
The Houston Astros signed Mark McLemore as a free agent.
The Houston Astros signed José Tolentino as a free agent.
- March 9, 1991
The Atlanta Braves signed Randy St. Claire as a free agent.
- March 12, 1991
The Montreal Expos signed Matt Maysey as a free agent.
The Chicago White Sox signed Keith Shepherd as a free agent.
- March 14, 1991
The California Angels traded Dante Bichette to the Milwaukee Brewers for Dave Parker.
- March 15, 1991
The Detroit Tigers signed Rick Renteria as a free agent.
The New York Mets signed Rafael Roque as an amateur free agent.
The Detroit Tigers released Clay Parker.
- March 16, 1991
The Milwaukee Brewers signed Esteban Beltré as a free agent.
- March 18, 1991
The Chicago White Sox signed Ron Coomer as a free agent.
The Baltimore Orioles purchased Paul Carey from Miami (Florida State).
The Kansas City Royals released Bo Jackson.
- March 19, 1991
The Houston Astros signed Jim Corsi as a free agent.
The Houston Astros signed Jimmy Jones as a free agent.
The Detroit Tigers traded Torey Lovullo to the New York Yankees for Mark Leiter.
- March 21, 1991
The Pittsburgh Pirates signed Esteban Loaiza as an amateur free agent.
The Pittsburgh Pirates traded Tommy Shields to the Baltimore Orioles for a player to be named later. The Baltimore Orioles sent Tony Beasley (minors) (September 5, 1991) to the Pittsburgh Pirates to complete the trade.
The Seattle Mariners selected Alan Cockrell off waivers from the Cleveland Indians.
- March 22, 1991
The Montreal Expos released Drew Hall.
- March 25, 1991
The Los Angeles Dodgers signed John Candelaria as a free agent.
The San Diego Padres released Mike Dunne.
The Cleveland Indians released Sergio Valdez.
- March 26, 1991
The Los Angeles Dodgers signed Gary Carter as a free agent.
The Cleveland Indians released James Hurst.
The Kansas City Royals released Greg Mathews.
The San Diego Padres selected José Meléndez off waivers from the Seattle Mariners.
- March 27, 1991
The Montreal Expos released Danny Leon.
- March 28, 1991
The Cleveland Indians purchased Gerónimo Berroa from the Seattle Mariners.
The Atlanta Braves released Oddibe McDowell.
The Los Angeles Dodgers released Fernando Valenzuela.
- March 29, 1991
The Houston Astros signed Dwayne Henry as a free agent.
The Kansas City Royals released Brad Holman.
The Texas Rangers released Pete Incaviglia.
The Chicago Cubs traded Gary Varsho to the Pittsburgh Pirates for Steve Carter.
- March 30, 1991
The San Francisco Giants signed Darnell Coles as a free agent.
The San Diego Padres signed Mike Maddux as a free agent.
The Houston Astros signed Melvin Mora as an amateur free agent.
The Montreal Expos released Mike Aldrete.
The San Diego Padres released Calvin Schiraldi.
The Detroit Tigers traded Jim Baxter (minors) to the Kansas City Royals for Andy Allanson.
- March 31, 1991
The Boston Red Sox released John Moses.
The Chicago White Sox traded Adam Peterson and Steve Rosenberg to the San Diego Padres for Kevin Garner (minors), Joey Cora and Warren Newson.
The Baltimore Orioles traded Pete Rose Jr. to the Chicago White Sox for Joe Borowski.
- April 1, 1991
The New York Yankees released Steve Balboni.
The Milwaukee Brewers released Mike Campbell.
The Chicago Cubs released Dave Clark.
The Cleveland Indians released Ron Kittle.
The California Angels released Fred Manrique.
The Cincinnati Reds released Gus Polidor.
The New York Mets released Terry Puhl.
The California Angels released Rick Schu.
The Atlanta Braves released Andres Thomas.
The Milwaukee Brewers released Rick Wrona.
The Atlanta Braves traded a player to be named later and Jimmy Kremers to the Montreal Expos for Boi Rodriguez (minors) and Otis Nixon. The Atlanta Braves sent Keith Morrison (minors) (June 3, 1991) to the Montreal Expos to complete the trade.
The Boston Red Sox traded Rob Murphy to the Seattle Mariners for Mike Gardiner.
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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