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The 1956 season’s official transaction log: 284 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 14, 1956 | Trade | Harry Chiti | Chicago Cubs | New York Yankees | Trade |
| Dec 13, 1956 | Trade | Unnamed | New York Giants | Brooklyn Dodgers | $30000 |
| Dec 13, 1956 | Trade | Dick Littlefield | New York Giants | Brooklyn Dodgers | Trade |
| Dec 13, 1956 | Trade | Jackie Robinson | Brooklyn Dodgers | New York Giants | Trade |
| Dec 13, 1956 | Trade | Jackie Robinson | New York Giants | Brooklyn Dodgers | Traded but refused to report |
| Dec 11, 1956 | Trade | Unnamed | New York Yankees | Chicago Cubs | cash and another player to be named |
| Dec 11, 1956 | Trade | Charlie Silvera | New York Yankees | Chicago Cubs | Trade |
| Dec 11, 1956 | Trade | Hobie Landrith | Chicago Cubs | St. Louis Cardinals | Trade |
| Dec 11, 1956 | Trade | Jim Davis | Chicago Cubs | St. Louis Cardinals | Trade |
| Dec 11, 1956 | Trade | Sam Jones | Chicago Cubs | St. Louis Cardinals | Trade |
| Dec 11, 1956 | Trade | Eddie Miksis | Chicago Cubs | St. Louis Cardinals | Trade |
| Dec 11, 1956 | Trade | Tom Poholsky | St. Louis Cardinals | Chicago Cubs | Trade |
| Dec 11, 1956 | Trade | Jackie Collum | St. Louis Cardinals | Chicago Cubs | Trade |
| Dec 11, 1956 | Trade | Ray Katt | St. Louis Cardinals | Chicago Cubs | Trade |
| Dec 11, 1956 | Trade | Wally Lammers | St. Louis Cardinals | Chicago Cubs | Trade |
| Dec 10, 1956 | Signed | Bobby Bolin | — | New York Giants | Amateur free agent signing |
| Dec 6, 1956 | Trade | Bobby Tiefenauer | Detroit Tigers | Toronto | Trade (date approximate, per the source) |
| Dec 6, 1956 | Trade | Jim Robertson | Detroit Tigers | Toronto | Trade (date approximate, per the source) |
| Dec 6, 1956 | Trade | Archie Wilson | Toronto | Detroit Tigers | Trade (date approximate, per the source) |
| Dec 6, 1956 | Trade | Donald Griffin | Toronto | Detroit Tigers | Trade (date approximate, per the source) |
| Dec 5, 1956 | Trade | Unnamed | Detroit Tigers | Kansas City Athletics | $20000 |
| Dec 5, 1956 | Trade | Jim Finigan | Kansas City Athletics | Detroit Tigers | Trade |
| Dec 5, 1956 | Trade | Jack Crimian | Kansas City Athletics | Detroit Tigers | Trade |
| Dec 5, 1956 | Trade | Bill Harrington | Kansas City Athletics | Detroit Tigers | Trade |
| Dec 5, 1956 | Trade | Eddie Robinson | Kansas City Athletics | Detroit Tigers | Trade |
| Dec 5, 1956 | Trade | Ned Garver | Detroit Tigers | Kansas City Athletics | Trade |
| Dec 5, 1956 | Trade | Gene Host | Detroit Tigers | Kansas City Athletics | Trade |
| Dec 5, 1956 | Trade | Virgil Trucks | Detroit Tigers | Kansas City Athletics | Trade |
| Dec 5, 1956 | Trade | Wayne Belardi | Detroit Tigers | Kansas City Athletics | Trade |
| Nov 19, 1956 | Trade | Del Ennis | Philadelphia Phillies | St. Louis Cardinals | Trade |
| Nov 19, 1956 | Trade | Bobby Morgan | St. Louis Cardinals | Philadelphia Phillies | Trade |
| Nov 19, 1956 | Trade | Rip Repulski | St. Louis Cardinals | Philadelphia Phillies | Trade |
| Nov 13, 1956 | Trade | Elmer Singleton | Cincinnati Reds | Chicago Cubs | Trade |
| Nov 13, 1956 | Trade | Ray Jablonski | Cincinnati Reds | Chicago Cubs | Trade |
| Nov 13, 1956 | Trade | Don Hoak | Chicago Cubs | Cincinnati Reds | Trade |
| Nov 13, 1956 | Trade | Warren Hacker | Chicago Cubs | Cincinnati Reds | Trade |
| Nov 13, 1956 | Trade | Pete Whisenant | Chicago Cubs | Cincinnati Reds | Trade |
| Oct 31, 1956 | Signed | Bobby Henrich | — | Cincinnati Reds | Amateur free agent signing (bonus baby) |
| Oct 26, 1956 | Signed as free agent | Hank Sauer | — | New York Giants | Free agent signing |
| Oct 22, 1956 | Released | Grady Hatton | Baltimore Orioles | — | Release |
| Oct 22, 1956 | Released | Walt Masterson | Detroit Tigers | — | Release |
| Oct 18, 1956 | Released | Hoot Evers | Baltimore Orioles | — | Release |
| Oct 18, 1956 | Released | Johnny Schmitz | Baltimore Orioles | — | Release |
| Oct 17, 1956 | Released | Red Munger | Pittsburgh Pirates | — | Release |
| Oct 16, 1956 | Released | Hank Sauer | St. Louis Cardinals | — | Release |
| Oct 15, 1956 | Trade | Unnamed | Milwaukee Braves | Toronto | cash and 2 players |
| Oct 15, 1956 | Trade | Jack Daniels | Milwaukee Braves | Toronto | Trade |
| Oct 15, 1956 | Trade | Carl Sawatski | Toronto | Milwaukee Braves | Trade |
| Oct 12, 1956 | Trade | Dick Rand | St. Louis Cardinals | Pittsburgh Pirates | Trade |
| Oct 11, 1956 | Trade | Art Ceccarelli | Kansas City Athletics | Baltimore Orioles | Trade |
| Oct 11, 1956 | Trade | Al Pilarcik | Kansas City Athletics | Baltimore Orioles | Trade |
| Oct 11, 1956 | Trade | Stu Miller | Philadelphia Phillies | New York Giants | Trade |
| Oct 11, 1956 | Trade | Jim Hearn | New York Giants | Philadelphia Phillies | Trade |
| Oct 9, 1956 | Released | Fritz Dorish | Boston Red Sox | — | Release |
| Oct 8, 1956 | Released | Walker Cooper | St. Louis Cardinals | — | Release |
| Oct 8, 1956 | Released | Jim Konstanty | St. Louis Cardinals | — | Release |
| Oct 8, 1956 | Released | Howie Pollet | Pittsburgh Pirates | — | Release |
| Oct 8, 1956 | Released | Andy Seminick | Philadelphia Phillies | — | Release |
| Oct 2, 1956 | Trade | Unnamed | St. Louis Cardinals | Toronto | $ |
| Oct 2, 1956 | Trade | Stan Jok | St. Louis Cardinals | Toronto | Trade |
| Oct 2, 1956 | Trade | Lynn Lovenguth | Toronto | St. Louis Cardinals | Trade |
| Oct 1, 1956 | Released | Paul Minner | Chicago Cubs | — | Release |
| Oct 1, 1956 | Trade | Gordon Jones | St. Louis Cardinals | New York Giants | Trade |
| Oct 1, 1956 | Trade | Unnamed | St. Louis Cardinals | Toronto | $ (date approximate, per the source) |
| Oct 1, 1956 | Trade | Jim Pearce | St. Louis Cardinals | Toronto | Trade (date approximate, per the source) |
| Oct 1, 1956 | Trade | Frank Barnes | Toronto | St. Louis Cardinals | Trade (date approximate, per the source) |
| Sep 21, 1956 | Trade | Ryne Duren | Baltimore Orioles | Kansas City Athletics | Trade |
| Sep 17, 1956 | Trade | Jim Pisoni | Baltimore Orioles | Kansas City Athletics | Trade |
| Sep 12, 1956 | Signed | Jim Derrington | — | Chicago White Sox | Amateur free agent signing (bonus baby) |
| Sep 4, 1956 | Signed | Ken MacKenzie | — | Milwaukee Braves | Amateur free agent signing |
| Sep 3, 1956 | Signed as free agent | Ralph Branca | — | Brooklyn Dodgers | Free agent signing |
| Sep 2, 1956 | Signed | George Werley | — | Baltimore Orioles | Amateur free agent signing |
| Sep 1, 1956 | Signed as free agent | Hoot Evers | — | Baltimore Orioles | Free agent signing |
| Sep 1956 | Signed as free agent | Roy Wright | — | New York Giants | Free agent signing |
| Aug 31, 1956 | Signed | Mike McCormick | — | New York Giants | Amateur free agent signing (bonus baby) |
| Aug 25, 1956 | Released | Phil Rizzuto | New York Yankees | — | Release |
| Aug 17, 1956 | Trade | Joe Ginsberg | Kansas City Athletics | Baltimore Orioles | Trade |
| Aug 17, 1956 | Trade | Hal Smith | Baltimore Orioles | Kansas City Athletics | Trade |
| Aug 15, 1956 | Trade | Unnamed | Washington Senators | Orlando | $250 plus 2 players |
| Aug 15, 1956 | Trade | Bill Pleis | Orlando | Washington Senators | Trade |
| Aug 13, 1956 | Signed | Don Pavletich | — | Cincinnati Reds | Amateur free agent signing (bonus baby) |
| Aug 6, 1956 | Released | Hoot Evers | Baltimore Orioles | — | Release |
| Jul 27, 1956 | Released | Clyde McCullough | Chicago Cubs | — | Release |
| Jul 22, 1956 | Signed | Moe Drabowsky | — | Chicago Cubs | Amateur free agent signing (bonus baby) |
| Jul 20, 1956 | Signed | Bob Aspromonte | — | Brooklyn Dodgers | Amateur free agent signing |
| Jul 19, 1956 | Signed | Bob Lipski | — | Philadelphia Phillies | Amateur free agent signing |
| Jul 18, 1956 | Signed as free agent | Bruce Edwards | — | Cincinnati Reds | Free agent signing |
| Jul 17, 1956 | Released | Bobby Adams | Baltimore Orioles | — | Release |
| Jul 15, 1956 | Signed as free agent | Howie Pollet | — | Pittsburgh Pirates | Free agent signing |
| Jul 13, 1956 | Released | Howie Pollet | Chicago White Sox | — | Release |
| Jul 11, 1956 | Trade | Tom Lasorda | Kansas City Athletics | New York Yankees | Trade |
| Jul 11, 1956 | Trade | Wally Burnette | New York Yankees | Kansas City Athletics | Trade |
| Jul 7, 1956 | Trade | Roy Hawes | Washington Senators | Philadelphia Phillies | Trade |
| Jul 7, 1956 | Trade | Pompeyo Davalillo | Washington Senators | Philadelphia Phillies | Trade |
| Jul 7, 1956 | Trade | Tony Ponce | Washington Senators | Philadelphia Phillies | Trade |
| Jul 7, 1956 | Trade | Dario Rubinstein | Washington Senators | Philadelphia Phillies | Trade |
| Jul 7, 1956 | Trade | Thornton Kipper | Philadelphia Phillies | Washington Senators | Trade |
| Jul 7, 1956 | Trade | Moose Johnson | Philadelphia Phillies | Washington Senators | Trade |
| Jul 7, 1956 | Trade | Mel Clark | Philadelphia Phillies | Washington Senators | Trade |
| Jul 7, 1956 | Trade | Unnamed | Philadelphia Phillies | Washington Senators | $ |
| Jul 4, 1956 | Trade | Ray Shearer | Brooklyn Dodgers | Milwaukee Braves | Trade |
| Jul 4, 1956 | Trade | Jim Frey | Milwaukee Braves | Brooklyn Dodgers | Trade |
| Jun 30, 1956 | Signed | Jack Curtis | — | Chicago Cubs | Amateur free agent signing |
| Jun 30, 1956 | Signed | Jerry Kindall | — | Chicago Cubs | Amateur free agent signing (bonus baby) |
| Jun 29, 1956 | Signed | Art Mahaffey | — | Philadelphia Phillies | Amateur free agent signing |
| Jun 29, 1956 | Signed | Ron Moeller | — | Baltimore Orioles | Amateur free agent signing |
| Jun 27, 1956 | Signed | Don Lee | — | Detroit Tigers | Amateur free agent signing |
| Jun 26, 1956 | Signed | Kent Hadley | — | Detroit Tigers | Amateur free agent signing |
| Jun 26, 1956 | Signed | Jack Lamabe | — | Philadelphia Phillies | Amateur free agent signing |
| Jun 23, 1956 | Trade | Spook Jacobs | Kansas City Athletics | Pittsburgh Pirates | Trade |
| Jun 23, 1956 | Trade | Jack McMahan | Pittsburgh Pirates | Kansas City Athletics | Trade |
| Jun 23, 1956 | Trade | Unnamed | Pittsburgh Pirates | Kansas City Athletics | Trade |
| Jun 22, 1956 | Released | John Edelman | Milwaukee Braves | — | Release |
| Jun 21, 1956 | Signed | Chris Cannizzaro | — | St. Louis Cardinals | Amateur free agent signing |
| Jun 21, 1956 | Signed | Jimmie Hall | — | Washington Senators | Amateur free agent signing |
| Jun 17, 1956 | Trade | Bob Stephenson | St. Louis Cardinals | New York Giants | Trade |
| Jun 16, 1956 | Signed | Al Kenders | — | Philadelphia Phillies | Amateur free agent signing |
| Jun 15, 1956 | Signed | Bud Zipfel | — | New York Yankees | Amateur free agent signing |
| Jun 14, 1956 | Signed as free agent | Jim Robertson | — | Detroit Tigers | Free agent signing |
| Jun 14, 1956 | Trade | Dick Littlefield | St. Louis Cardinals | New York Giants | Trade |
| Jun 14, 1956 | Trade | Jackie Brandt | St. Louis Cardinals | New York Giants | Trade |
| Jun 14, 1956 | Trade | Red Schoendienst | St. Louis Cardinals | New York Giants | Trade |
| Jun 14, 1956 | Trade | Bill Sarni | St. Louis Cardinals | New York Giants | Trade |
| Jun 14, 1956 | Trade | Unnamed | New York Giants | St. Louis Cardinals | $ |
| Jun 14, 1956 | Trade | Al Dark | New York Giants | St. Louis Cardinals | Trade |
| Jun 14, 1956 | Trade | Ray Katt | New York Giants | St. Louis Cardinals | Trade |
| Jun 14, 1956 | Trade | Don Liddle | New York Giants | St. Louis Cardinals | Trade |
| Jun 14, 1956 | Trade | Whitey Lockman | New York Giants | St. Louis Cardinals | Trade |
| Jun 14, 1956 | Trade | Unnamed | Kansas City Athletics | New York Yankees | $ |
| Jun 14, 1956 | Trade | Eddie Robinson | New York Yankees | Kansas City Athletics | Trade |
| Jun 14, 1956 | Trade | Lou Skizas | New York Yankees | Kansas City Athletics | Trade |
| Jun 14, 1956 | Trade | Moe Burtschy | Kansas City Athletics | New York Yankees | Trade |
| Jun 14, 1956 | Trade | Bill Renna | Kansas City Athletics | New York Yankees | Trade |
| Jun 6, 1956 | Signed | Jim Brewer | — | Chicago Cubs | Amateur free agent signing |
| Jun 4, 1956 | Signed as free agent | Bobby Adams | — | Baltimore Orioles | Free agent signing |
| Jun 4, 1956 | Signed as free agent | Jim Konstanty | — | St. Louis Cardinals | Free agent signing |
| May 28, 1956 | Released | Bobby Adams | Baltimore Orioles | — | Release |
| May 28, 1956 | Trade | Unnamed | St. Louis Cardinals | Pittsburgh Pirates | $ |
| May 28, 1956 | Trade | Toby Atwell | Pittsburgh Pirates | St. Louis Cardinals | Trade |
| May 22, 1956 | Signed as free agent | Elmer Valo | — | Philadelphia Phillies | Free agent signing |
| May 21, 1956 | Released | Elmer Valo | Kansas City Athletics | — | Release |
| May 21, 1956 | Trade | Bob Nieman | Chicago White Sox | Baltimore Orioles | Trade |
| May 21, 1956 | Trade | Mike Fornieles | Chicago White Sox | Baltimore Orioles | Trade |
| May 21, 1956 | Trade | Connie Johnson | Chicago White Sox | Baltimore Orioles | Trade |
| May 21, 1956 | Trade | George Kell | Chicago White Sox | Baltimore Orioles | Trade |
| May 21, 1956 | Trade | Jim Wilson | Baltimore Orioles | Chicago White Sox | Trade |
| May 21, 1956 | Trade | Dave Philley | Baltimore Orioles | Chicago White Sox | Trade |
| May 19, 1956 | Released | Al Silvera | Cincinnati Reds | — | Release |
| May 18, 1956 | Released | Jim Konstanty | New York Yankees | — | Release |
| May 18, 1956 | Released | Wally Westlake | Philadelphia Phillies | — | Release |
| May 17, 1956 | Trade | Dick Littlefield | Pittsburgh Pirates | St. Louis Cardinals | Trade |
| May 17, 1956 | Trade | Bobby Del Greco | Pittsburgh Pirates | St. Louis Cardinals | Trade |
| May 17, 1956 | Trade | Bill Virdon | St. Louis Cardinals | Pittsburgh Pirates | Trade |
| May 16, 1956 | Trade | Joe Frazier | St. Louis Cardinals | Cincinnati Reds | Trade |
| May 16, 1956 | Trade | Alex Grammas | St. Louis Cardinals | Cincinnati Reds | Trade |
| May 16, 1956 | Trade | Chuck Harmon | Cincinnati Reds | St. Louis Cardinals | Trade |
| May 15, 1956 | Trade | Fred Hatfield | Detroit Tigers | Chicago White Sox | Trade |
| May 15, 1956 | Trade | Jim Delsing | Detroit Tigers | Chicago White Sox | Trade |
| May 15, 1956 | Trade | Bob Kennedy | Chicago White Sox | Detroit Tigers | Trade |
| May 15, 1956 | Trade | Jim Brideweser | Chicago White Sox | Detroit Tigers | Trade |
| May 15, 1956 | Trade | Harry Byrd | Chicago White Sox | Detroit Tigers | Trade |
| May 15, 1956 | Trade | Preston Ward | Pittsburgh Pirates | Cleveland Indians | Trade |
| May 15, 1956 | Trade | Hank Foiles | Cleveland Indians | Pittsburgh Pirates | Trade |
| May 14, 1956 | Trade | Bobby Morgan | Philadelphia Phillies | St. Louis Cardinals | Trade |
| May 14, 1956 | Trade | Solly Hemus | St. Louis Cardinals | Philadelphia Phillies | Trade |
| May 13, 1956 | Trade | Hoot Evers | Cleveland Indians | Baltimore Orioles | Trade |
| May 13, 1956 | Trade | Dave Pope | Baltimore Orioles | Cleveland Indians | Trade |
| May 11, 1956 | Signed as free agent | Walt Masterson | — | Detroit Tigers | Free agent signing |
| May 11, 1956 | Trade | Murry Dickson | Philadelphia Phillies | St. Louis Cardinals | Trade |
| May 11, 1956 | Trade | Herm Wehmeier | Philadelphia Phillies | St. Louis Cardinals | Trade |
| May 11, 1956 | Trade | Harvey Haddix | St. Louis Cardinals | Philadelphia Phillies | Trade |
| May 11, 1956 | Trade | Ben Flowers | St. Louis Cardinals | Philadelphia Phillies | Trade |
| May 11, 1956 | Trade | Stu Miller | St. Louis Cardinals | Philadelphia Phillies | Trade |
| May 10, 1956 | Trade | Corky Valentine | Cincinnati Reds | Milwaukee Braves | Trade |
| May 7, 1956 | Trade | Max Surkont | Pittsburgh Pirates | St. Louis Cardinals | Trade |
| May 7, 1956 | Trade | Luis Arroyo | St. Louis Cardinals | Pittsburgh Pirates | Trade |
| May 4, 1956 | Released | Don Wheeler | Chicago White Sox | — | Release |
| May 1, 1956 | Trade | Paul LaPalme | St. Louis Cardinals | Cincinnati Reds | Trade |
| May 1, 1956 | Trade | Milt Smith | Cincinnati Reds | St. Louis Cardinals | Trade |
| Apr 30, 1956 | Released | Walt Masterson | Washington Senators | — | Release |
| Apr 27, 1956 | Released | Paul Martin | Pittsburgh Pirates | — | Release |
| Apr 18, 1956 | Released | Gus Niarhos | Philadelphia Phillies | — | Release |
| Apr 17, 1956 | Trade | Unnamed | Philadelphia Phillies | Buffalo | $ |
| Apr 17, 1956 | Trade | Louis Heyman | Philadelphia Phillies | Buffalo | Trade |
| Apr 17, 1956 | Trade | Duane Pillette | Buffalo | Philadelphia Phillies | Trade |
| Apr 16, 1956 | Signed as free agent | Howie Pollet | — | Chicago White Sox | Free agent signing |
| Apr 16, 1956 | Trade | Unnamed | Kansas City Athletics | Brooklyn Dodgers | $ |
| Apr 16, 1956 | Trade | Lee Wheat | Kansas City Athletics | Brooklyn Dodgers | Trade |
| Apr 16, 1956 | Trade | Tom Saffell | Kansas City Athletics | Brooklyn Dodgers | Trade |
| Apr 16, 1956 | Trade | Tim Thompson | Brooklyn Dodgers | Kansas City Athletics | Trade |
| Apr 9, 1956 | Released | Joe Coleman | Detroit Tigers | — | Release |
| Apr 9, 1956 | Trade | George Crowe | Milwaukee Braves | Cincinnati Reds | Trade |
| Apr 9, 1956 | Trade | Bob Hazle | Cincinnati Reds | Milwaukee Braves | Trade |
| Apr 2, 1956 | Trade | Whitey Herzog | New York Yankees | Washington Senators | Trade |
| Mar 30, 1956 | Trade | Hank Sauer | Chicago Cubs | St. Louis Cardinals | Trade |
| Mar 30, 1956 | Trade | Pete Whisenant | St. Louis Cardinals | Chicago Cubs | Trade |
| Mar 24, 1956 | Signed as free agent | Sam Mele | — | Cleveland Indians | Free agent signing |
| Mar 12, 1956 | Released | Dizzy Trout | Boston Red Sox | — | Release |
| Mar 1956 | Released | Fred Whitfield | Pittsburgh Pirates | — | Release (date approximate, per the source) |
| Feb 22, 1956 | Released | Bruce Edwards | Washington Senators | — | Release |
| Feb 8, 1956 | Trade | Mickey McDermott | Washington Senators | New York Yankees | Trade |
| Feb 8, 1956 | Trade | Bobby Kline | Washington Senators | New York Yankees | Trade |
| Feb 8, 1956 | Trade | Lou Berberet | New York Yankees | Washington Senators | Trade |
| Feb 8, 1956 | Trade | Bob Wiesler | New York Yankees | Washington Senators | Trade |
| Feb 8, 1956 | Trade | Herb Plews | New York Yankees | Washington Senators | Trade |
| Feb 8, 1956 | Trade | Dick Tettelbach | New York Yankees | Washington Senators | Trade |
| Jan 31, 1956 | Trade | Jackie Collum | Cincinnati Reds | St. Louis Cardinals | Trade |
| Jan 31, 1956 | Trade | Brooks Lawrence | St. Louis Cardinals | Cincinnati Reds | Trade |
| Jan 31, 1956 | Trade | Sonny Senerchia | St. Louis Cardinals | Cincinnati Reds | Trade |
| Jan 19, 1956 | Released | Spec Shea | Washington Senators | — | Release |
| Jan 18, 1956 | Released | Sam Mele | Cincinnati Reds | — | Release |
| before the 1956 season | Signed | Bob Allen | — | Cleveland Indians | Amateur free agent signing |
| before the 1956 season | Signed | Rogelio Alvarez | — | Cincinnati Reds | Amateur free agent signing |
| before the 1956 season | Signed | Joe Azcue | — | Cincinnati Reds | Amateur free agent signing |
| before the 1956 season | Signed | Jim Bailey | — | Cincinnati Reds | Amateur free agent signing |
| before the 1956 season | Signed | Ed Bauta | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1956 season | Signed | Bo Belinsky | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1956 season | Signed | Ernie Bowman | — | New York Giants | Amateur free agent signing |
| before the 1956 season | Signed | Alan Brice | — | Chicago White Sox | Amateur free agent signing |
| before the 1956 season | Signed | Cam Carreon | — | Chicago White Sox | Amateur free agent signing |
| before the 1956 season | Signed | Elio Chacon | — | Cincinnati Reds | Amateur free agent signing |
| before the 1956 season | Signed | Nelson Chittum | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1956 season | Signed | Don Choate | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1956 season | Signed | Bert Cueto | — | Washington Senators | Amateur free agent signing |
| before the 1956 season | Signed | Tommy Davis | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1956 season | Signed | Ed Donnelly | — | Kansas City Athletics | Amateur free agent signing |
| before the 1956 season | Signed | Jim Donohue | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1956 season | Signed | Curt Flood | — | Cincinnati Reds | Amateur free agent signing |
| before the 1956 season | Signed | Joe Gaines | — | Cincinnati Reds | Amateur free agent signing |
| before the 1956 season | Signed | Bob Giallombardo | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1956 season | Signed | Fred Gladding | — | Detroit Tigers | Amateur free agent signing |
| before the 1956 season | Signed | Ron Hansen | — | Baltimore Orioles | Amateur free agent signing |
| before the 1956 season | Signed | Tim Harkness | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1956 season | Signed | Jim Heise | — | Washington Senators | Amateur free agent signing |
| before the 1956 season | Signed | Jim Hickman | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1956 season | Signed | Chuck Hinton | — | Baltimore Orioles | Amateur free agent signing |
| before the 1956 season | Signed | Ed Hobaugh | — | Chicago White Sox | Amateur free agent signing |
| before the 1956 season | Signed | Julian Javier | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1956 season | Signed | Deron Johnson | — | New York Yankees | Amateur free agent signing |
| before the 1956 season | Signed | Hal Jones | — | Kansas City Athletics | Amateur free agent signing |
| before the 1956 season | Signed | Bobby Knoop | — | Milwaukee Braves | Amateur free agent signing |
| before the 1956 season | Signed | Howie Koplitz | — | Detroit Tigers | Amateur free agent signing |
| before the 1956 season | Signed | Frank Kostro | — | Detroit Tigers | Amateur free agent signing |
| before the 1956 season | Signed | Bob Lee | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1956 season | Signed | Em Lindbeck | — | Milwaukee Braves | Amateur free agent signing |
| before the 1956 season | Signed | Gordon MacKenzie | — | Kansas City Athletics | Amateur free agent signing |
| before the 1956 season | Signed | Hector Maestri | — | Washington Senators | Amateur free agent signing |
| before the 1956 season | Signed | J. C. Martin | — | Chicago White Sox | Amateur free agent signing |
| before the 1956 season | Signed | Tom McAvoy | — | Washington Senators | Amateur free agent signing |
| before the 1956 season | Signed | Don Miles | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1956 season | Signed | Don Mincher | — | Chicago White Sox | Amateur free agent signing |
| before the 1956 season | Signed | Phil Mudrock | — | New York Yankees | Amateur free agent signing |
| before the 1956 season | Signed | Mel Nelson | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1956 season | Signed | Gene Oliver | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1956 season | Signed | George Perez | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1956 season | Signed | Jim Perry | — | Cleveland Indians | Amateur free agent signing |
| before the 1956 season | Signed | Gary Peters | — | Chicago White Sox | Amateur free agent signing |
| before the 1956 season | Signed | Vada Pinson | — | Cincinnati Reds | Amateur free agent signing |
| before the 1956 season | Signed | Juan Pizarro | — | Milwaukee Braves | Amateur free agent signing |
| before the 1956 season | Signed | Phil Regan | — | Detroit Tigers | Amateur free agent signing |
| before the 1956 season | Signed | Hal Reniff | — | New York Yankees | Amateur free agent signing |
| before the 1956 season | Signed | Buck Rodgers | — | Detroit Tigers | Amateur free agent signing |
| before the 1956 season | Signed | Cookie Rojas | — | Cincinnati Reds | Amateur free agent signing |
| before the 1956 season | Signed | Joe Schaffernoth | — | Chicago Cubs | Amateur free agent signing |
| before the 1956 season | Signed | Gordon Seyfried | — | Detroit Tigers | Amateur free agent signing |
| before the 1956 season | Signed | Barry Shetrone | — | Baltimore Orioles | Amateur free agent signing |
| before the 1956 season | Signed | Nate Smith | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1956 season | Signed | Tracy Stallard | — | Boston Red Sox | Amateur free agent signing |
| before the 1956 season | Signed | Wes Stock | — | Baltimore Orioles | Amateur free agent signing |
| before the 1956 season | Signed | Moose Stubing | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1956 season | Signed | Ron Taylor | — | Cleveland Indians | Amateur free agent signing |
| before the 1956 season | Signed as free agent | Sammy Taylor | — | Milwaukee Braves | Free agent signing with first major-league team |
| before the 1956 season | Signed | Carl Thomas | — | Cleveland Indians | Amateur free agent signing |
| before the 1956 season | Signed | Dave Tyriver | — | Cleveland Indians | Amateur free agent signing |
| before the 1956 season | Signed | Bob Uecker | — | Milwaukee Braves | Amateur free agent signing |
| before the 1956 season | Signed | Fred Valentine | — | Baltimore Orioles | Amateur free agent signing |
| before the 1956 season | Signed | Jay Ward | — | New York Yankees | Amateur free agent signing |
| before the 1956 season | Signed | Fred Whitfield | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1956 season | Signed | Billy Williams | — | Chicago Cubs | Amateur free agent signing |
| before the 1956 season | Signed | Don Williams | — | Kansas City Athletics | Amateur free agent signing |
| before the 1956 season | Signed | Neil Wilson | — | New York Giants | Amateur free agent signing |
| before the 1956 season | Signed | Corky Withrow | — | Milwaukee Braves | Amateur free agent signing |
| before the 1956 season | Trade | Bubba Church | Chicago Cubs | Sacramento | Trade |
| before the 1956 season | Trade | Joe Stanka | Chicago Cubs | Sacramento | Trade |
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.