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The 1955 season’s official transaction log: 265 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 30, 1955 | Trade | Unnamed | Detroit Tigers | Brooklyn Dodgers | $ |
| Dec 30, 1955 | Trade | Leo Cristante | Detroit Tigers | Brooklyn Dodgers | Trade |
| Dec 30, 1955 | Trade | Pete Wojey | Brooklyn Dodgers | Detroit Tigers | Trade |
| Dec 15, 1955 | Signed as free agent | Walker Cooper | — | St. Louis Cardinals | Free agent signing |
| Dec 14, 1955 | Released | Walker Cooper | Chicago Cubs | — | Release |
| Dec 9, 1955 | Trade | Randy Jackson | Chicago Cubs | Brooklyn Dodgers | Trade |
| Dec 9, 1955 | Trade | Don Elston | Chicago Cubs | Brooklyn Dodgers | Trade |
| Dec 9, 1955 | Trade | Don Hoak | Brooklyn Dodgers | Chicago Cubs | Trade |
| Dec 9, 1955 | Trade | Russ Meyer | Brooklyn Dodgers | Chicago Cubs | Trade |
| Dec 9, 1955 | Trade | Walt Moryn | Brooklyn Dodgers | Chicago Cubs | Trade |
| Dec 1955 | Signed | Jay Ritchie | — | Boston Red Sox | Amateur free agent signing |
| Dec 1955 | Trade | Murray Wall | Milwaukee Braves | New York Giants | Trade |
| Nov 30, 1955 | Trade | Virgil Trucks | Chicago White Sox | Detroit Tigers | Trade |
| Nov 30, 1955 | Trade | Bubba Phillips | Detroit Tigers | Chicago White Sox | Trade |
| Nov 28, 1955 | Trade | Hobie Landrith | Cincinnati Reds | Chicago Cubs | Trade |
| Nov 28, 1955 | Trade | Hal Jeffcoat | Chicago Cubs | Cincinnati Reds | Trade |
| Nov 14, 1955 | Signed | Felipe Alou | — | New York Giants | Amateur free agent signing |
| Nov 8, 1955 | Trade | Mickey Vernon | Washington Senators | Boston Red Sox | Trade |
| Nov 8, 1955 | Trade | Bob Porterfield | Washington Senators | Boston Red Sox | Trade |
| Nov 8, 1955 | Trade | Johnny Schmitz | Washington Senators | Boston Red Sox | Trade |
| Nov 8, 1955 | Trade | Tom Umphlett | Washington Senators | Boston Red Sox | Trade |
| Nov 8, 1955 | Trade | Karl Olson | Boston Red Sox | Washington Senators | Trade |
| Nov 8, 1955 | Trade | Dick Brodowski | Boston Red Sox | Washington Senators | Trade |
| Nov 8, 1955 | Trade | Tex Clevenger | Boston Red Sox | Washington Senators | Trade |
| Nov 8, 1955 | Trade | Neil Chrisley | Boston Red Sox | Washington Senators | Trade |
| Nov 8, 1955 | Trade | Al Curtis | Boston Red Sox | Washington Senators | Trade |
| Nov 7, 1955 | Signed as free agent | Wally Westlake | — | Philadelphia Phillies | Free agent signing |
| Nov 2, 1955 | Released | Ferris Fain | Cleveland Indians | — | Release |
| Oct 25, 1955 | Trade | Jim Busby | Chicago White Sox | Cleveland Indians | Trade |
| Oct 25, 1955 | Trade | Chico Carrasquel | Chicago White Sox | Cleveland Indians | Trade |
| Oct 25, 1955 | Trade | Larry Doby | Cleveland Indians | Chicago White Sox | Trade |
| Oct 24, 1955 | Released | Ralph Kiner | Cleveland Indians | — | Release |
| Oct 20, 1955 | Released | Harry Walker | St. Louis Cardinals | — | Release |
| Oct 18, 1955 | Trade | Cal Abrams | Baltimore Orioles | Chicago White Sox | Trade |
| Oct 18, 1955 | Trade | Bobby Adams | Chicago White Sox | Baltimore Orioles | Trade |
| Oct 15, 1955 | Signed as free agent | Cal McLish | — | Cleveland Indians | Free agent signing |
| Oct 14, 1955 | Released | Sid Gordon | New York Giants | — | Release |
| Oct 13, 1955 | Released | Vic Raschi | Kansas City Athletics | — | Release |
| Oct 12, 1955 | Trade | Unnamed | Kansas City Athletics | Toronto | $60000 |
| Oct 12, 1955 | Trade | Marion Fricano | Kansas City Athletics | Toronto | Trade |
| Oct 12, 1955 | Trade | Jack Crimian | Toronto | Kansas City Athletics | Trade |
| Oct 10, 1955 | Released | Eddie Lopat | Baltimore Orioles | — | Release |
| Oct 10, 1955 | Released | Eddie Waitkus | Philadelphia Phillies | — | Release |
| Oct 3, 1955 | Released | Eddie Joost | Boston Red Sox | — | Release |
| Oct 3, 1955 | Released | Peanuts Lowrey | Philadelphia Phillies | — | Release |
| Oct 3, 1955 | Released | Howie Pollet | Chicago Cubs | — | Release |
| Sep 29, 1955 | Signed | Mack Burk | — | Philadelphia Phillies | Amateur free agent signing (bonus baby) |
| Sep 22, 1955 | Trade | Unnamed | Chicago Cubs | Sacramento | $ |
| Sep 22, 1955 | Trade | John Briggs | Sacramento | Chicago Cubs | Trade |
| Sep 22, 1955 | Trade | Richie Myers | Sacramento | Chicago Cubs | Trade |
| Sep 19, 1955 | Released | Monty Basgall | Pittsburgh Pirates | — | Release |
| Sep 17, 1955 | Released | Ted Gray | Baltimore Orioles | — | Release |
| Sep 15, 1955 | Signed | Alex George | — | Kansas City Athletics | Amateur free agent signing |
| Sep 11, 1955 | Signed | Angelo Dagres | — | Baltimore Orioles | Amateur free agent signing |
| Sep 8, 1955 | Trade | Ben Flowers | Detroit Tigers | St. Louis Cardinals | Trade |
| Sep 8, 1955 | Trade | Bobby Tiefenauer | St. Louis Cardinals | Detroit Tigers | Trade |
| Sep 2, 1955 | Signed | Roger Marquis | — | Baltimore Orioles | Amateur free agent signing |
| Sep 1955 | Trade | Hal Bevan | Kansas City Athletics | Cincinnati Reds | Trade |
| Sep 1955 | Trade | Ray Noble | Cincinnati Reds | Kansas City Athletics | Trade |
| Sep 1955 | Trade | Red Murff | New York Giants | Milwaukee Braves | Trade (date approximate, per the source) |
| Aug 31, 1955 | Released | Davey Williams | New York Giants | — | Release |
| Aug 27, 1955 | Signed | Red Swanson | — | Pittsburgh Pirates | Amateur free agent signing (bonus baby) |
| Aug 26, 1955 | Trade | Gil Coan | Chicago White Sox | New York Giants | Trade |
| Aug 26, 1955 | Trade | Ron Northey | New York Giants | Chicago White Sox | Trade |
| Aug 20, 1955 | Signed | Fred Van Dusen | — | Philadelphia Phillies | Amateur free agent signing |
| Aug 19, 1955 | Signed | George Altman | — | Chicago Cubs | Amateur free agent signing |
| Aug 19, 1955 | Signed | J C Hartman | — | Chicago Cubs | Amateur free agent signing |
| Aug 19, 1955 | Signed | Lindy McDaniel | — | St. Louis Cardinals | Amateur free agent signing (bonus baby) |
| Aug 1, 1955 | Released | Hank Majeski | Baltimore Orioles | — | Release |
| Jul 30, 1955 | Signed as free agent | Eddie Waitkus | — | Philadelphia Phillies | Free agent signing |
| Jul 30, 1955 | Trade | Eddie Lopat | New York Yankees | Baltimore Orioles | Trade |
| Jul 30, 1955 | Trade | Jim McDonald | Baltimore Orioles | New York Yankees | Trade |
| Jul 26, 1955 | Signed as free agent | Ted Gray | — | Baltimore Orioles | Free agent signing |
| Jul 26, 1955 | Signed | Gordie Sundin | — | Baltimore Orioles | Amateur free agent signing |
| Jul 25, 1955 | Released | Eddie Waitkus | Baltimore Orioles | — | Release |
| Jul 20, 1955 | Released | Ted Gray | New York Yankees | — | Release |
| Jul 16, 1955 | Released | Johnny Sain | Kansas City Athletics | — | Release |
| Jul 16, 1955 | Trade | Ron Northey | Charleston | New York Giants | Trade |
| Jul 16, 1955 | Trade | Floyd Melliere | Charleston | New York Giants | Trade |
| Jul 16, 1955 | Trade | Guilford Dickens | New York Giants | Charleston | Trade |
| Jul 14, 1955 | Signed as free agent | Ferris Fain | — | Cleveland Indians | Free agent signing |
| Jul 14, 1955 | Trade | Bill Wight | Cleveland Indians | Baltimore Orioles | Trade |
| Jul 14, 1955 | Trade | Hoot Evers | Baltimore Orioles | Cleveland Indians | Trade |
| Jul 9, 1955 | Released | Saul Rogovin | Baltimore Orioles | — | Release |
| Jul 9, 1955 | Signed as free agent | Saul Rogovin | — | Philadelphia Phillies | Free agent signing |
| Jul 9, 1955 | Released | Wally Westlake | Baltimore Orioles | — | Release |
| Jul 8, 1955 | Signed as free agent | Joe Coleman | — | Detroit Tigers | Free agent signing |
| Jul 6, 1955 | Released | Ferris Fain | Detroit Tigers | — | Release |
| Jul 5, 1955 | Signed | Kenny Kuhn | — | Cleveland Indians | Amateur free agent signing (bonus baby) |
| Jul 1, 1955 | Released | Joe Coleman | Baltimore Orioles | — | Release |
| Jul 1, 1955 | Released | Vern Stephens | Chicago White Sox | — | Release |
| Jun 30, 1955 | Signed as free agent | Ted Gray | — | New York Yankees | Free agent signing |
| Jun 30, 1955 | Signed | Dave Stenhouse | — | Chicago Cubs | Amateur free agent signing |
| Jun 29, 1955 | Released | Ted Gray | Cleveland Indians | — | Release |
| Jun 29, 1955 | Trade | Unnamed | Cincinnati Reds | Oakland | $ |
| Jun 29, 1955 | Trade | Clint Hartung | Cincinnati Reds | Oakland | Trade |
| Jun 29, 1955 | Trade | Joe Brovia | Oakland | Cincinnati Reds | Trade |
| Jun 28, 1955 | Signed | Paul Martin | — | Pittsburgh Pirates | Amateur free agent signing (bonus baby) |
| Jun 27, 1955 | Trade | Hank Majeski | Cleveland Indians | Baltimore Orioles | Trade |
| Jun 27, 1955 | Trade | Bobby Young | Baltimore Orioles | Cleveland Indians | Trade |
| Jun 24, 1955 | Released | Willard Marshall | Chicago White Sox | — | Release |
| Jun 21, 1955 | Signed | Bill Monbouquette | — | Boston Red Sox | Amateur free agent signing |
| Jun 20, 1955 | Signed | Tom Gastall | — | Baltimore Orioles | Amateur free agent signing (bonus baby) |
| Jun 20, 1955 | Signed | Tex Nelson | — | Baltimore Orioles | Amateur free agent signing (bonus baby) |
| Jun 17, 1955 | Signed | Jim Pagliaroni | — | Boston Red Sox | Amateur free agent signing (bonus baby) |
| Jun 15, 1955 | Signed as free agent | Ted Gray | — | Cleveland Indians | Free agent signing |
| Jun 15, 1955 | Trade | Gene Woodling | Baltimore Orioles | Cleveland Indians | Trade |
| Jun 15, 1955 | Trade | Billy Cox | Baltimore Orioles | Cleveland Indians | Trade |
| Jun 15, 1955 | Trade | Dave Pope | Cleveland Indians | Baltimore Orioles | Trade |
| Jun 15, 1955 | Trade | Wally Westlake | Cleveland Indians | Baltimore Orioles | Trade |
| Jun 15, 1955 | Trade | Billy Cox | Cleveland Indians | Baltimore Orioles | Traded but refused to report |
| Jun 15, 1955 | Trade | Unnamed | Baltimore Orioles | Cleveland Indians | $15000 |
| Jun 14, 1955 | Signed | John Easton | — | Philadelphia Phillies | Amateur free agent signing |
| Jun 14, 1955 | Trade | Bob Borkowski | Cincinnati Reds | Brooklyn Dodgers | Trade |
| Jun 13, 1955 | Signed | Bob Hartman | — | Milwaukee Braves | Amateur free agent signing |
| Jun 11, 1955 | Signed | Jim Small | — | Detroit Tigers | Amateur free agent signing (bonus baby) |
| Jun 9, 1955 | Signed | Jim Brady | — | Detroit Tigers | Amateur free agent signing (bonus baby) |
| Jun 9, 1955 | Signed | Bob Powell | — | Chicago White Sox | Amateur free agent signing (bonus baby) |
| Jun 9, 1955 | Trade | Unnamed | Cincinnati Reds | Brooklyn Dodgers | $ |
| Jun 9, 1955 | Trade | Joe Black | Brooklyn Dodgers | Cincinnati Reds | Trade |
| Jun 7, 1955 | Trade | Jim Busby | Washington Senators | Chicago White Sox | Trade |
| Jun 7, 1955 | Trade | Johnny Groth | Chicago White Sox | Washington Senators | Trade |
| Jun 7, 1955 | Trade | Clint Courtney | Chicago White Sox | Washington Senators | Trade |
| Jun 7, 1955 | Trade | Bob Chakales | Chicago White Sox | Washington Senators | Trade |
| Jun 7, 1955 | Trade | Unnamed | Philadelphia Phillies | Brooklyn Dodgers | $ |
| Jun 7, 1955 | Trade | Dave Cole | Philadelphia Phillies | Brooklyn Dodgers | Trade |
| Jun 7, 1955 | Trade | Ron Negray | Brooklyn Dodgers | Philadelphia Phillies | Trade |
| Jun 6, 1955 | Trade | Les Moss | Baltimore Orioles | Chicago White Sox | Trade |
| Jun 6, 1955 | Trade | Fritz Dorish | Chicago White Sox | Baltimore Orioles | Trade |
| Jun 4, 1955 | Signed | Wayne Causey | — | Baltimore Orioles | Amateur free agent signing (bonus baby) |
| Jun 3, 1955 | Signed | Al Silvera | — | Cincinnati Reds | Amateur free agent signing (bonus baby) |
| Jun 3, 1955 | Trade | Del Rice | St. Louis Cardinals | Milwaukee Braves | Trade |
| Jun 3, 1955 | Trade | Pete Whisenant | Milwaukee Braves | St. Louis Cardinals | Trade |
| Jun 1, 1955 | Released | Pete Suder | Kansas City Athletics | — | Release |
| Jun 1955 | Signed | Tom Borland | — | Baltimore Orioles | Amateur free agent signing (bonus baby) |
| Jun 1955 | Signed | Deacon Jones | — | Chicago White Sox | Amateur free agent signing |
| Jun 1955 | Released | Sal Yvars | Detroit Tigers | — | Release |
| May 31, 1955 | Signed | Clete Boyer | — | Kansas City Athletics | Amateur free agent signing (bonus baby) |
| May 31, 1955 | Signed | John Edelman | — | Milwaukee Braves | Amateur free agent signing (bonus baby) |
| May 29, 1955 | Signed | Don Eaddy | — | Chicago Cubs | Amateur free agent signing |
| May 29, 1955 | Signed | Jerry Schoonmaker | — | Washington Senators | Amateur free agent signing (bonus baby) |
| May 28, 1955 | Signed as free agent | Harry Walker | — | St. Louis Cardinals | Free agent signing |
| May 23, 1955 | Released | Ted Gray | Chicago White Sox | — | Release |
| May 21, 1955 | Signed | Norm Cash | — | Chicago White Sox | Amateur free agent signing |
| May 12, 1955 | Signed as free agent | John Mackinson | — | St. Louis Cardinals | Free agent signing (date approximate, per the source) |
| May 11, 1955 | Released | Mickey Grasso | New York Giants | — | Release |
| May 11, 1955 | Released | Hal Newhouser | Cleveland Indians | — | Release |
| May 11, 1955 | Trade | Unnamed | Kansas City Athletics | New York Yankees | $ |
| May 11, 1955 | Trade | Johnny Sain | New York Yankees | Kansas City Athletics | Trade |
| May 11, 1955 | Trade | Enos Slaughter | New York Yankees | Kansas City Athletics | Trade |
| May 11, 1955 | Trade | Sonny Dixon | Kansas City Athletics | New York Yankees | Trade |
| May 10, 1955 | Released | John Mackinson | Kansas City Athletics | — | Release (date approximate, per the source) |
| May 9, 1955 | Released | Floyd Baker | Philadelphia Phillies | — | Release |
| May 9, 1955 | Released | Phil Cavarretta | Chicago White Sox | — | Release |
| May 9, 1955 | Released | Stan Jok | Chicago White Sox | — | Release |
| May 9, 1955 | Signed as free agent | Stan Jok | — | St. Louis Cardinals | Free agent signing |
| May 3, 1955 | Released | Howie Fox | Baltimore Orioles | — | Release |
| May 2, 1955 | Signed as free agent | Vern Stephens | — | Chicago White Sox | Free agent signing |
| May 1, 1955 | Trade | Gus Keriazakos | Washington Senators | Kansas City Athletics | Trade (date approximate, per the source) |
| May 1, 1955 | Trade | Al Sima | Kansas City Athletics | Washington Senators | Trade (date approximate, per the source) |
| Apr 30, 1955 | Released | Ewell Blackwell | Kansas City Athletics | — | Release |
| Apr 30, 1955 | Trade | Smoky Burgess | Philadelphia Phillies | Cincinnati Reds | Trade |
| Apr 30, 1955 | Trade | Steve Ridzik | Philadelphia Phillies | Cincinnati Reds | Trade |
| Apr 30, 1955 | Trade | Stan Palys | Philadelphia Phillies | Cincinnati Reds | Trade |
| Apr 30, 1955 | Trade | Andy Seminick | Cincinnati Reds | Philadelphia Phillies | Trade |
| Apr 30, 1955 | Trade | Glen Gorbous | Cincinnati Reds | Philadelphia Phillies | Trade |
| Apr 30, 1955 | Trade | Jim Greengrass | Cincinnati Reds | Philadelphia Phillies | Trade |
| Apr 26, 1955 | Signed as free agent | Vic Raschi | — | Kansas City Athletics | Free agent signing |
| Apr 19, 1955 | Released | Vince Gonzales | Washington Senators | — | Release |
| Apr 19, 1955 | Released | Vic Raschi | St. Louis Cardinals | — | Release |
| Apr 18, 1955 | Released | Vern Stephens | Baltimore Orioles | — | Release |
| Apr 14, 1955 | Released | Johnny Pesky | Baltimore Orioles | — | Release |
| Apr 10, 1955 | Signed | Jim Pyburn | — | Baltimore Orioles | Amateur free agent signing (bonus baby) |
| Apr 7, 1955 | Released | Sid Hudson | Boston Red Sox | — | Release |
| Apr 6, 1955 | Released | Al Brazle | Chicago White Sox | — | Release |
| Apr 5, 1955 | Released | Johnny Wyrostek | Philadelphia Phillies | — | Release |
| Mar 29, 1955 | Signed as free agent | Eddie Joost | — | Boston Red Sox | Free agent signing |
| Mar 17, 1955 | Trade | Unnamed | Baltimore Orioles | Brooklyn Dodgers | $ |
| Mar 17, 1955 | Trade | Frank Kellert | Baltimore Orioles | Brooklyn Dodgers | Trade |
| Mar 17, 1955 | Trade | Erv Palica | Brooklyn Dodgers | Baltimore Orioles | Trade |
| Mar 12, 1955 | Signed | Willie McCovey | — | New York Giants | Amateur free agent signing |
| Mar 4, 1955 | Released | George Metkovich | Milwaukee Braves | — | Release |
| Feb 19, 1955 | Signed | Jimmie Coker | — | Philadelphia Phillies | Amateur free agent signing |
| Feb 11, 1955 | Signed as free agent | Peanuts Lowrey | — | Philadelphia Phillies | Free agent signing |
| Feb 8, 1955 | Signed | Don Kaiser | — | Chicago Cubs | Amateur free agent signing (bonus baby) |
| Jan 28, 1955 | Signed as free agent | Vince Gonzales | — | Washington Senators | Free agent signing with first major-league team |
| Jan 26, 1955 | Signed | Tom Carroll | — | New York Yankees | Amateur free agent signing (bonus baby) |
| Jan 24, 1955 | Signed | Bob Allison | — | Washington Senators | Amateur free agent signing |
| Jan 24, 1955 | Released | Connie Marrero | Washington Senators | — | Release |
| Jan 13, 1955 | Trade | Unnamed | Charleston | Detroit Tigers | $ |
| Jan 13, 1955 | Trade | William Killinger | Charleston | Detroit Tigers | Trade |
| Jan 13, 1955 | Trade | Ron Northey | Detroit Tigers | Charleston | Trade |
| Jan 11, 1955 | Released | Mickey Owen | Boston Red Sox | — | Release |
| Jan 11, 1955 | Trade | Unnamed | St. Louis Cardinals | Pittsburgh Pirates | $ |
| Jan 11, 1955 | Trade | Ben Wade | St. Louis Cardinals | Pittsburgh Pirates | Trade |
| Jan 11, 1955 | Trade | Paul LaPalme | Pittsburgh Pirates | St. Louis Cardinals | Trade |
| before the 1955 season | Signed as free agent | Jim Archer | — | Baltimore Orioles | Free agent signing |
| before the 1955 season | Signed | Ray Barker | — | Baltimore Orioles | Amateur free agent signing |
| before the 1955 season | Signed | Gary Bell | — | Cleveland Indians | Amateur free agent signing |
| before the 1955 season | Signed | Bob Botz | — | Milwaukee Braves | Amateur free agent signing |
| before the 1955 season | Signed | Marv Breeding | — | Baltimore Orioles | Amateur free agent signing |
| before the 1955 season | Signed | Jim Bronstad | — | New York Yankees | Amateur free agent signing |
| before the 1955 season | Signed | Ellis Burton | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1955 season | Signed | Jim Campbell | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1955 season | Signed | Duke Carmel | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1955 season | Signed | Orlando Cepeda | — | New York Giants | Amateur free agent signing |
| before the 1955 season | Signed | Joe Christopher | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1955 season | Signed as free agent | Vibert Clarke | — | Washington Senators | Free agent signing with first major-league team |
| before the 1955 season | Signed | Lou Clinton | — | Boston Red Sox | Amateur free agent signing |
| before the 1955 season | Signed | Choo-Choo Coleman | — | Washington Senators | Amateur free agent signing |
| before the 1955 season | Signed | Cliff Cook | — | Cincinnati Reds | Amateur free agent signing |
| before the 1955 season | Signed | Jim Davenport | — | New York Giants | Amateur free agent signing |
| before the 1955 season | Signed | Bob Davis | — | Kansas City Athletics | Amateur free agent signing |
| before the 1955 season | Signed | Don Dillard | — | Cleveland Indians | Amateur free agent signing |
| before the 1955 season | Signed | Dan Dobbek | — | Washington Senators | Amateur free agent signing |
| before the 1955 season | Signed | Jim Duffalo | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1955 season | Signed | Bob Dustal | — | Detroit Tigers | Amateur free agent signing |
| before the 1955 season | Signed | Jack Feller | — | Detroit Tigers | Amateur free agent signing |
| before the 1955 season | Signed | Larry Foss | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1955 season | Signed | Dave Gerard | — | Chicago Cubs | Amateur free agent signing |
| before the 1955 season | Signed | Don Gile | — | Boston Red Sox | Amateur free agent signing |
| before the 1955 season | Signed | John Goetz | — | Chicago Cubs | Amateur free agent signing |
| before the 1955 season | Signed | Jesse Gonder | — | Cincinnati Reds | Amateur free agent signing |
| before the 1955 season | Signed | Dallas Green | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1955 season | Signed | Lenny Green | — | Baltimore Orioles | Amateur free agent signing |
| before the 1955 season | Signed as free agent | Connie Grob | — | Brooklyn Dodgers | Free agent signing with first major-league team |
| before the 1955 season | Signed | Joe Grzenda | — | Detroit Tigers | Amateur free agent signing |
| before the 1955 season | Signed | Carroll Hardy | — | Cleveland Indians | Amateur free agent signing |
| before the 1955 season | Signed | Wynn Hawkins | — | Cleveland Indians | Amateur free agent signing |
| before the 1955 season | Signed | Glen Hobbie | — | Chicago Cubs | Amateur free agent signing |
| before the 1955 season | Signed | Willard Hunter | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1955 season | Signed | Al Jackson | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1955 season | Signed | Evans Killeen | — | Kansas City Athletics | Amateur free agent signing |
| before the 1955 season | Signed | Jack Kralick | — | Chicago White Sox | Amateur free agent signing |
| before the 1955 season | Signed | Bill Kunkel | — | Boston Red Sox | Amateur free agent signing |
| before the 1955 season | Signed | Barry Latman | — | Chicago White Sox | Amateur free agent signing |
| before the 1955 season | Signed | Don Leppert | — | Milwaukee Braves | Amateur free agent signing |
| before the 1955 season | Signed | Carl Mathias | — | Cleveland Indians | Amateur free agent signing |
| before the 1955 season | Signed | Jim McAnany | — | Chicago White Sox | Amateur free agent signing |
| before the 1955 season | Signed | Jim McKnight | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1955 season | Signed | Bubba Morton | — | Detroit Tigers | Amateur free agent signing |
| before the 1955 season | Signed | Chi-Chi Olivo | — | Milwaukee Braves | Amateur free agent signing |
| before the 1955 season | Signed | Diomedes Olivo | — | Cincinnati Reds | Amateur free agent signing |
| before the 1955 season | Signed | Jose Pagan | — | New York Giants | Amateur free agent signing |
| before the 1955 season | Released | Dick Phillips | Washington Senators | — | Release |
| before the 1955 season | Signed as free agent | Dick Phillips | — | Milwaukee Braves | Free agent signing |
| before the 1955 season | Signed | Ron Piche | — | Milwaukee Braves | Amateur free agent signing |
| before the 1955 season | Signed | Larry Raines | — | Cleveland Indians | Amateur free agent signing |
| before the 1955 season | Signed | Claude Raymond | — | Milwaukee Braves | Amateur free agent signing |
| before the 1955 season | Signed | Duane Richards | — | Cincinnati Reds | Amateur free agent signing |
| before the 1955 season | Signed | Dick Ricketts | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1955 season | Signed | Brooks Robinson | — | Baltimore Orioles | Amateur free agent signing |
| before the 1955 season | Signed | Bob Sadowski | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1955 season | Signed | Ted Sadowski | — | Washington Senators | Amateur free agent signing |
| before the 1955 season | Signed | Jimmie Schaffer | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1955 season | Signed | Garland Shifflett | — | Washington Senators | Amateur free agent signing |
| before the 1955 season | Signed | Bill Short | — | New York Yankees | Amateur free agent signing |
| before the 1955 season | Signed | Jack Smith | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1955 season | Signed | Verle Tiefenthaler | — | New York Giants | Amateur free agent signing |
| before the 1955 season | Signed | Felix Torres | — | Cincinnati Reds | Amateur free agent signing |
| before the 1955 season | Signed | Paul Toth | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1955 season | Signed | Elder White | — | Cleveland Indians | Amateur free agent signing |
| before the 1955 season | Signed | Dave Wickersham | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1955 season | Signed | Ted Wills | — | Boston Red Sox | Amateur free agent signing |
| before the 1955 season | Released | John Wyatt | St. Louis Cardinals | — | Release |
Every row is mapped onto the same trade / signing / release vocabulary the modern feed uses, with the era’s own type description kept on each row. Club names are the names of the day (the Boston Braves years, the Brooklyn Dodgers years), and each links to the franchise it is today. Some dates are only partially known or flagged approximate by the source; they are shown exactly as published, never completed to a fake precise day.