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The 1957 season’s official transaction log: 277 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 28, 1957 | Trade | Ted Kluszewski | Cincinnati Reds | Pittsburgh Pirates | Trade |
| Dec 28, 1957 | Trade | Dee Fondy | Pittsburgh Pirates | Cincinnati Reds | Trade |
| Dec 23, 1957 | Signed | Jim O'Toole | — | Cincinnati Reds | Amateur free agent signing |
| Dec 19, 1957 | Released | Andy Seminick | Philadelphia Phillies | — | Release |
| Dec 18, 1957 | Released | Wes Westrum | San Francisco Giants | — | Release |
| Dec 17, 1957 | Released | Gene Mauch | Boston Red Sox | — | Release |
| Dec 16, 1957 | Trade | Harvey Haddix | Philadelphia Phillies | Cincinnati Reds | Trade |
| Dec 16, 1957 | Trade | Wally Post | Cincinnati Reds | Philadelphia Phillies | Trade |
| Dec 10, 1957 | Trade | Tom Poholsky | Chicago Cubs | San Francisco Giants | Trade |
| Dec 10, 1957 | Trade | Freddy Rodriguez | San Francisco Giants | Chicago Cubs | Trade |
| Dec 9, 1957 | Released | Jerry Coleman | New York Yankees | — | Release |
| Dec 9, 1957 | Trade | Bob Purkey | Pittsburgh Pirates | Cincinnati Reds | Trade |
| Dec 9, 1957 | Trade | Don Gross | Cincinnati Reds | Pittsburgh Pirates | Trade |
| Dec 5, 1957 | Trade | Taylor Phillips | Milwaukee Braves | Chicago Cubs | Trade |
| Dec 5, 1957 | Trade | Sammy Taylor | Milwaukee Braves | Chicago Cubs | Trade |
| Dec 5, 1957 | Trade | Eddie Haas | Chicago Cubs | Milwaukee Braves | Trade |
| Dec 5, 1957 | Trade | Don Kaiser | Chicago Cubs | Milwaukee Braves | Trade |
| Dec 5, 1957 | Trade | Bob Rush | Chicago Cubs | Milwaukee Braves | Trade |
| Dec 5, 1957 | Trade | Marty Kutyna | St. Louis Cardinals | Cincinnati Reds | Trade |
| Dec 5, 1957 | Trade | Ted Wieand | St. Louis Cardinals | Cincinnati Reds | Trade |
| Dec 5, 1957 | Trade | Willard Schmidt | St. Louis Cardinals | Cincinnati Reds | Trade |
| Dec 5, 1957 | Trade | Curt Flood | Cincinnati Reds | St. Louis Cardinals | Trade |
| Dec 5, 1957 | Trade | Joe Taylor | Cincinnati Reds | St. Louis Cardinals | Trade |
| Dec 4, 1957 | Trade | Early Wynn | Cleveland Indians | Chicago White Sox | Trade |
| Dec 4, 1957 | Trade | Al Smith | Cleveland Indians | Chicago White Sox | Trade |
| Dec 4, 1957 | Trade | Minnie Miñoso | Chicago White Sox | Cleveland Indians | Trade |
| Dec 4, 1957 | Trade | Fred Hatfield | Chicago White Sox | Cleveland Indians | Trade |
| Dec 3, 1957 | Trade | Tito Francona | Baltimore Orioles | Chicago White Sox | Trade |
| Dec 3, 1957 | Trade | Ray Moore | Baltimore Orioles | Chicago White Sox | Trade |
| Dec 3, 1957 | Trade | Billy Goodman | Baltimore Orioles | Chicago White Sox | Trade |
| Dec 3, 1957 | Trade | Larry Doby | Chicago White Sox | Baltimore Orioles | Trade |
| Dec 3, 1957 | Trade | Jim Marshall | Chicago White Sox | Baltimore Orioles | Trade |
| Dec 3, 1957 | Trade | Russ Heman | Chicago White Sox | Baltimore Orioles | Trade |
| Dec 3, 1957 | Trade | Jack Harshman | Chicago White Sox | Baltimore Orioles | Trade |
| Nov 26, 1957 | Released | Charlie Silvera | Chicago Cubs | — | Release |
| Nov 25, 1957 | Released | Joe Black | Washington Senators | — | Release |
| Nov 20, 1957 | Trade | Gus Zernial | Kansas City Athletics | Detroit Tigers | Trade |
| Nov 20, 1957 | Trade | Billy Martin | Kansas City Athletics | Detroit Tigers | Trade |
| Nov 20, 1957 | Trade | Tom Morgan | Kansas City Athletics | Detroit Tigers | Trade |
| Nov 20, 1957 | Trade | Lou Skizas | Kansas City Athletics | Detroit Tigers | Trade |
| Nov 20, 1957 | Trade | Mickey McDermott | Kansas City Athletics | Detroit Tigers | Trade |
| Nov 20, 1957 | Trade | Tim Thompson | Kansas City Athletics | Detroit Tigers | Trade |
| Nov 20, 1957 | Trade | Bill Tuttle | Detroit Tigers | Kansas City Athletics | Trade |
| Nov 20, 1957 | Trade | Jim Small | Detroit Tigers | Kansas City Athletics | Trade |
| Nov 20, 1957 | Trade | Duke Maas | Detroit Tigers | Kansas City Athletics | Trade |
| Nov 20, 1957 | Trade | John Tsitouris | Detroit Tigers | Kansas City Athletics | Trade |
| Nov 20, 1957 | Trade | Frank House | Detroit Tigers | Kansas City Athletics | Trade |
| Nov 20, 1957 | Trade | Kent Hadley | Detroit Tigers | Kansas City Athletics | Trade |
| Nov 16, 1957 | Trade | Unnamed | Milwaukee Braves | Chicago Cubs | $ |
| Nov 16, 1957 | Trade | Ben Johnson | Milwaukee Braves | Chicago Cubs | Trade |
| Nov 16, 1957 | Trade | Chick King | Milwaukee Braves | Chicago Cubs | Trade |
| Nov 16, 1957 | Trade | Leonard Williams | Milwaukee Braves | Chicago Cubs | Trade |
| Nov 16, 1957 | Trade | Casey Wise | Chicago Cubs | Milwaukee Braves | Trade |
| Oct 29, 1957 | Signed | George Williams | — | Philadelphia Phillies | Amateur free agent signing |
| Oct 15, 1957 | Released | Walker Cooper | St. Louis Cardinals | — | Release |
| Oct 15, 1957 | Released | Murry Dickson | St. Louis Cardinals | — | Release |
| Oct 15, 1957 | Released | Bob Kennedy | Los Angeles Dodgers | — | Release |
| Oct 15, 1957 | Released | Ron Northey | Philadelphia Phillies | — | Release |
| Oct 15, 1957 | Trade | Wayne Terwilliger | San Francisco Giants | Detroit Tigers | Trade |
| Oct 15, 1957 | Trade | Jack Dittmer | Detroit Tigers | San Francisco Giants | Trade |
| Oct 7, 1957 | Released | Eddie Robinson | Baltimore Orioles | — | Release |
| Oct 7, 1957 | Released | Dizzy Trout | Baltimore Orioles | — | Release |
| Sep 24, 1957 | Signed | Howie Reed | — | Kansas City Athletics | Amateur free agent signing |
| Sep 14, 1957 | Trade | Dolan Nichols | Cleveland Indians | Chicago Cubs | Trade (date approximate, per the source) |
| Sep 7, 1957 | Signed | Dave Skaugstad | — | Cincinnati Reds | Amateur free agent signing |
| Sep 2, 1957 | Signed | Ralph Lumenti | — | Washington Senators | Amateur free agent signing (bonus baby) |
| Sep 1, 1957 | Signed as free agent | Eddie Robinson | — | Baltimore Orioles | Free agent signing |
| Sep 1, 1957 | Signed as free agent | Andy Seminick | — | Philadelphia Phillies | Free agent signing |
| Sep 1957 | Signed | Bill Spanswick | — | Boston Red Sox | Amateur free agent signing |
| Aug 28, 1957 | Trade | Bob Alexander | Chicago Cubs | Cleveland Indians | Trade (date approximate, per the source) |
| Aug 26, 1957 | Signed as free agent | Dizzy Trout | — | Baltimore Orioles | Free agent signing |
| Aug 17, 1957 | Signed | Bob Hendley | — | Milwaukee Braves | Amateur free agent signing |
| Aug 17, 1957 | Signed | Jay Hook | — | Cincinnati Reds | Amateur free agent signing (bonus baby) |
| Aug 16, 1957 | Released | Steve Gromek | Detroit Tigers | — | Release |
| Aug 12, 1957 | Signed | Dave Hill | — | Kansas City Athletics | Amateur free agent signing (bonus baby) |
| Aug 6, 1957 | Signed as free agent | Joe Black | — | Washington Senators | Free agent signing |
| Aug 5, 1957 | Signed | George Thomas | — | Detroit Tigers | Amateur free agent signing (bonus baby) |
| Jul 30, 1957 | Signed as free agent | Ron Northey | — | Philadelphia Phillies | Free agent signing |
| Jul 29, 1957 | Released | Ron Northey | Chicago White Sox | — | Release |
| Jul 14, 1957 | Trade | Herb Moford | St. Louis Cardinals | Detroit Tigers | Trade |
| Jul 14, 1957 | Trade | Bob Thorpe | Detroit Tigers | St. Louis Cardinals | Trade |
| Jul 13, 1957 | Signed | Harvey Branch | — | Chicago Cubs | Amateur free agent signing |
| Jul 5, 1957 | Released | Joe Black | Philadelphia Phillies | — | Release |
| Jul 3, 1957 | Signed | Mickey Harrington | — | Philadelphia Phillies | Amateur free agent signing |
| Jul 2, 1957 | Signed | Claude Osteen | — | Cincinnati Reds | Amateur free agent signing |
| Jul 1, 1957 | Signed | Jim Woods | — | Chicago Cubs | Amateur free agent signing |
| Jun 29, 1957 | Released | Eddie Robinson | Cleveland Indians | — | Release |
| Jun 28, 1957 | Signed | Jerry Walker | — | Baltimore Orioles | Amateur free agent signing (bonus baby) |
| Jun 26, 1957 | Signed | Rod Miller | — | Brooklyn Dodgers | Amateur free agent signing |
| Jun 26, 1957 | Signed | Milt Pappas | — | Baltimore Orioles | Amateur free agent signing |
| Jun 25, 1957 | Signed | Harry Taylor | — | Kansas City Athletics | Amateur free agent signing |
| Jun 24, 1957 | Signed | Jack Fisher | — | Baltimore Orioles | Amateur free agent signing |
| Jun 24, 1957 | Signed | Gordon Massa | — | Chicago Cubs | Amateur free agent signing |
| Jun 20, 1957 | Signed | Dick Bertell | — | Chicago Cubs | Amateur free agent signing |
| Jun 20, 1957 | Signed | Bob Miller | — | St. Louis Cardinals | Amateur free agent signing (bonus baby) |
| Jun 19, 1957 | Signed | Ed Keegan | — | Philadelphia Phillies | Amateur free agent signing |
| Jun 17, 1957 | Released | Frank Baumholtz | Philadelphia Phillies | — | Release |
| Jun 17, 1957 | Signed | Jim Kaat | — | Washington Senators | Amateur free agent signing |
| Jun 17, 1957 | Signed | Charlie Lindstrom | — | Chicago White Sox | Amateur free agent signing |
| Jun 16, 1957 | Signed | Stover McIlwain | — | Chicago White Sox | Amateur free agent signing |
| Jun 15, 1957 | Signed | Steve Boros | — | Detroit Tigers | Amateur free agent signing (bonus baby) |
| Jun 15, 1957 | Trade | Danny O'Connell | Milwaukee Braves | New York Giants | Trade |
| Jun 15, 1957 | Trade | Ray Crone | Milwaukee Braves | New York Giants | Trade |
| Jun 15, 1957 | Trade | Bobby Thomson | Milwaukee Braves | New York Giants | Trade |
| Jun 15, 1957 | Trade | Red Schoendienst | New York Giants | Milwaukee Braves | Trade |
| Jun 15, 1957 | Trade | Ryne Duren | Kansas City Athletics | New York Yankees | Trade |
| Jun 15, 1957 | Trade | Jim Pisoni | Kansas City Athletics | New York Yankees | Trade |
| Jun 15, 1957 | Trade | Harry Simpson | Kansas City Athletics | New York Yankees | Trade |
| Jun 15, 1957 | Trade | Billy Martin | New York Yankees | Kansas City Athletics | Trade |
| Jun 15, 1957 | Trade | Ralph Terry | New York Yankees | Kansas City Athletics | Trade |
| Jun 15, 1957 | Trade | Woodie Held | New York Yankees | Kansas City Athletics | Trade |
| Jun 15, 1957 | Trade | Bob Martyn | New York Yankees | Kansas City Athletics | Trade |
| Jun 14, 1957 | Signed | Johnny Callison | — | Chicago White Sox | Amateur free agent signing |
| Jun 14, 1957 | Signed | Chris Short | — | Philadelphia Phillies | Amateur free agent signing |
| Jun 14, 1957 | Trade | Earl Torgeson | Detroit Tigers | Chicago White Sox | Trade |
| Jun 14, 1957 | Trade | Dave Philley | Chicago White Sox | Detroit Tigers | Trade |
| Jun 14, 1957 | Trade | Mike Fornieles | Baltimore Orioles | Boston Red Sox | Trade |
| Jun 14, 1957 | Trade | Billy Goodman | Boston Red Sox | Baltimore Orioles | Trade |
| Jun 13, 1957 | Signed | Frank Zupo | — | Baltimore Orioles | Amateur free agent signing (bonus baby) |
| Jun 13, 1957 | Trade | Dick Williams | Baltimore Orioles | Cleveland Indians | Trade |
| Jun 13, 1957 | Trade | Jim Busby | Cleveland Indians | Baltimore Orioles | Trade |
| Jun 12, 1957 | Signed | Bob Heffner | — | Boston Red Sox | Amateur free agent signing |
| Jun 4, 1957 | Trade | Clete Boyer | Kansas City Athletics | New York Yankees | Trade |
| Jun 3, 1957 | Signed | Ken Hamlin | — | Pittsburgh Pirates | Amateur free agent signing |
| Jun 1, 1957 | Signed | Hawk Taylor | — | Milwaukee Braves | Amateur free agent signing (bonus baby) |
| Jun 1957 | Signed | Russ Gibson | — | Boston Red Sox | Amateur free agent signing |
| May 27, 1957 | Signed | Jerry Mallett | — | Boston Red Sox | Amateur free agent signing |
| May 26, 1957 | Signed | John DeMerit | — | Milwaukee Braves | Amateur free agent signing (bonus baby) |
| May 24, 1957 | Trade | Jim Fridley | New York Yankees | Brooklyn Dodgers | Trade |
| May 24, 1957 | Trade | Ben Flowers | Brooklyn Dodgers | New York Yankees | Trade |
| May 23, 1957 | Signed | Von McDaniel | — | St. Louis Cardinals | Amateur free agent signing (bonus baby) |
| May 23, 1957 | Trade | Don Elston | Brooklyn Dodgers | Chicago Cubs | Trade |
| May 23, 1957 | Trade | Vito Valentinetti | Chicago Cubs | Brooklyn Dodgers | Trade |
| May 23, 1957 | Trade | Jackie Collum | Chicago Cubs | Brooklyn Dodgers | Trade |
| May 20, 1957 | Signed as free agent | Eddie Robinson | — | Cleveland Indians | Free agent signing |
| May 17, 1957 | Released | Ellis Kinder | Chicago White Sox | — | Release |
| May 17, 1957 | Released | Tom Patton | Baltimore Orioles | — | Release |
| May 17, 1957 | Released | Eddie Robinson | Detroit Tigers | — | Release |
| May 15, 1957 | Trade | Dick Brodowski | Washington Senators | Cleveland Indians | Trade |
| May 15, 1957 | Trade | Dick Tettelbach | Washington Senators | Cleveland Indians | Trade |
| May 15, 1957 | Trade | Bob Usher | Cleveland Indians | Washington Senators | Trade |
| May 13, 1957 | Released | Russ Meyer | Boston Red Sox | — | Release |
| May 13, 1957 | Released | Bob Powell | Chicago White Sox | — | Release |
| May 10, 1957 | Trade | Glen Gorbous | Philadelphia Phillies | St. Louis Cardinals | Trade |
| May 10, 1957 | Trade | Chuck Harmon | St. Louis Cardinals | Philadelphia Phillies | Trade |
| May 8, 1957 | Signed as free agent | Don Minnick | — | Washington Senators | Free agent signing |
| May 6, 1957 | Trade | Lou Sleater | Milwaukee Braves | Detroit Tigers | Trade |
| May 6, 1957 | Trade | Roy Hawes | Detroit Tigers | Milwaukee Braves | Trade |
| May 1, 1957 | Trade | Dee Fondy | Chicago Cubs | Pittsburgh Pirates | Trade |
| May 1, 1957 | Trade | Gene Baker | Chicago Cubs | Pittsburgh Pirates | Trade |
| May 1, 1957 | Trade | Dale Long | Pittsburgh Pirates | Chicago Cubs | Trade |
| May 1, 1957 | Trade | Lee Walls | Pittsburgh Pirates | Chicago Cubs | Trade |
| Apr 30, 1957 | Trade | Jack Phillips | Detroit Tigers | Boston Red Sox | Trade |
| Apr 30, 1957 | Trade | Karl Olson | Boston Red Sox | Detroit Tigers | Trade |
| Apr 29, 1957 | Trade | Milt Bolling | Boston Red Sox | Washington Senators | Trade |
| Apr 29, 1957 | Trade | Russ Kemmerer | Boston Red Sox | Washington Senators | Trade |
| Apr 29, 1957 | Trade | Faye Throneberry | Boston Red Sox | Washington Senators | Trade |
| Apr 29, 1957 | Trade | Bob Chakales | Washington Senators | Boston Red Sox | Trade |
| Apr 29, 1957 | Trade | Dean Stone | Washington Senators | Boston Red Sox | Trade |
| Apr 21, 1957 | Signed as free agent | Walker Cooper | — | St. Louis Cardinals | Free agent signing |
| Apr 20, 1957 | Trade | Bobby Del Greco | St. Louis Cardinals | Chicago Cubs | Trade |
| Apr 20, 1957 | Trade | Ed Mayer | St. Louis Cardinals | Chicago Cubs | Trade |
| Apr 20, 1957 | Trade | Jim King | Chicago Cubs | St. Louis Cardinals | Trade |
| Apr 16, 1957 | Released | Sam Mele | Cleveland Indians | — | Release |
| Apr 16, 1957 | Trade | Dick Littlefield | New York Giants | Chicago Cubs | Trade |
| Apr 16, 1957 | Trade | Bob Lennon | New York Giants | Chicago Cubs | Trade |
| Apr 16, 1957 | Trade | Ray Jablonski | Chicago Cubs | New York Giants | Trade |
| Apr 16, 1957 | Trade | Ray Katt | Chicago Cubs | New York Giants | Trade |
| Apr 15, 1957 | Released | Bob Kennedy | Detroit Tigers | — | Release |
| Apr 15, 1957 | Signed as free agent | Bob Kennedy | — | Chicago White Sox | Free agent signing |
| Apr 10, 1957 | Released | Ted Tappe | Chicago Cubs | — | Release |
| Apr 8, 1957 | Trade | Ben Flowers | Philadelphia Phillies | Brooklyn Dodgers | Trade |
| Apr 5, 1957 | Trade | Jack Urban | New York Yankees | Kansas City Athletics | Trade |
| Apr 5, 1957 | Trade | Unnamed | Philadelphia Phillies | Brooklyn Dodgers | $75000 |
| Apr 5, 1957 | Trade | Ron Negray | Philadelphia Phillies | Brooklyn Dodgers | Trade |
| Apr 5, 1957 | Trade | Tim Harkness | Philadelphia Phillies | Brooklyn Dodgers | Trade |
| Apr 5, 1957 | Trade | Elmer Valo | Philadelphia Phillies | Brooklyn Dodgers | Trade |
| Apr 5, 1957 | Trade | Melvin Geho | Philadelphia Phillies | Brooklyn Dodgers | Trade |
| Apr 5, 1957 | Trade | Chico Fernandez | Brooklyn Dodgers | Philadelphia Phillies | Trade |
| Apr 4, 1957 | Trade | Unnamed | Kansas City Athletics | New York Yankees | Trade |
| Apr 3, 1957 | Trade | Dick Cole | Pittsburgh Pirates | Milwaukee Braves | Trade |
| Apr 3, 1957 | Trade | Jim Pendleton | Milwaukee Braves | Pittsburgh Pirates | Trade |
| Mar 27, 1957 | Released | Bill Sarni | New York Giants | — | Release |
| Mar 21, 1957 | Trade | Rocky Nelson | St. Louis Cardinals | Toronto | Trade |
| Mar 14, 1957 | Trade | Bill Renna | New York Yankees | Boston Red Sox | Trade |
| Mar 14, 1957 | Trade | Eli Grba | Boston Red Sox | New York Yankees | Trade |
| Mar 14, 1957 | Trade | Gordie Windhorn | Boston Red Sox | New York Yankees | Trade |
| Mar 1957 | Signed as free agent | Chuck Essegian | — | Philadelphia Phillies | Free agent signing |
| Mar 1957 | Released | Fred Whitfield | Baltimore Orioles | — | Release (date approximate, per the source) |
| Feb 26, 1957 | Trade | Whitey Lockman | St. Louis Cardinals | New York Giants | Trade |
| Feb 26, 1957 | Trade | Hoyt Wilhelm | New York Giants | St. Louis Cardinals | Trade |
| Feb 21, 1957 | Signed | Manny Mota | — | New York Giants | Amateur free agent signing |
| Feb 19, 1957 | Trade | Irv Noren | New York Yankees | Kansas City Athletics | Trade |
| Feb 19, 1957 | Trade | Milt Graff | New York Yankees | Kansas City Athletics | Trade |
| Feb 19, 1957 | Trade | Mickey McDermott | New York Yankees | Kansas City Athletics | Trade |
| Feb 19, 1957 | Trade | Tom Morgan | New York Yankees | Kansas City Athletics | Trade |
| Feb 19, 1957 | Trade | Rip Coleman | New York Yankees | Kansas City Athletics | Trade |
| Feb 19, 1957 | Trade | Billy Hunter | New York Yankees | Kansas City Athletics | Trade |
| Feb 19, 1957 | Trade | Art Ditmar | Kansas City Athletics | New York Yankees | Trade |
| Feb 19, 1957 | Trade | Bobby Shantz | Kansas City Athletics | New York Yankees | Trade |
| Feb 19, 1957 | Trade | Jack McMahan | Kansas City Athletics | New York Yankees | Trade |
| Feb 19, 1957 | Trade | Wayne Belardi | Kansas City Athletics | New York Yankees | Trade |
| Feb 12, 1957 | Trade | Unnamed | Detroit Tigers | Milwaukee Braves | $ |
| Feb 12, 1957 | Trade | Chick King | Detroit Tigers | Milwaukee Braves | Trade |
| Feb 12, 1957 | Trade | Jack Dittmer | Milwaukee Braves | Detroit Tigers | Trade |
| Feb 6, 1957 | Signed | Buddy Pritchard | — | Pittsburgh Pirates | Amateur free agent signing (bonus baby) |
| Jan 27, 1957 | Signed | Wayne Graham | — | Philadelphia Phillies | Amateur free agent signing |
| Jan 27, 1957 | Signed as free agent | Jack Lamabe | — | Pittsburgh Pirates | Free agent signing |
| Jan 18, 1957 | Released | Bruce Edwards | Cincinnati Reds | — | Release |
| Jan 9, 1957 | Released | Bob Feller | Cleveland Indians | — | Release |
| Jan 1957 | Trade | Unnamed | Chicago Cubs | Boston Red Sox | $ |
| Jan 1957 | Trade | Frank Kellert | Chicago Cubs | Boston Red Sox | Trade |
| Jan 1957 | Trade | Bill Henry | Boston Red Sox | Chicago Cubs | Trade |
| before the 1957 season | Signed as free agent | Bobby Adams | — | Chicago Cubs | Free agent signing |
| before the 1957 season | Signed | Matty Alou | — | New York Giants | Amateur free agent signing |
| before the 1957 season | Signed | George Banks | — | New York Yankees | Amateur free agent signing |
| before the 1957 season | Signed | Steve Barber | — | Baltimore Orioles | Amateur free agent signing |
| before the 1957 season | Signed | Howie Bedell | — | Milwaukee Braves | Amateur free agent signing |
| before the 1957 season | Signed | Bud Bloomfield | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1957 season | Signed | Walt Bond | — | Cleveland Indians | Amateur free agent signing |
| before the 1957 season | Signed | Cal Browning | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1957 season | Signed | Mike Brumley | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1957 season | Signed | Leo Burke | — | Baltimore Orioles | Amateur free agent signing |
| before the 1957 season | Signed | Larry Burright | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1957 season | Signed | Tom Butters | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1957 season | Signed | Doug Camilli | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1957 season | Signed | Donn Clendenon | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1957 season | Released | Choo-Choo Coleman | Washington Senators | — | Release |
| before the 1957 season | Signed | Mike Cuellar | — | Cincinnati Reds | Amateur free agent signing |
| before the 1957 season | Signed | Tony Curry | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1957 season | Signed | Jack Damaska | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1957 season | Signed | Jim Duckworth | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1957 season | Signed | Chuck Estrada | — | Baltimore Orioles | Amateur free agent signing |
| before the 1957 season | Signed | Bob Farley | — | New York Giants | Amateur free agent signing |
| before the 1957 season | Signed | Joe Gibbon | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1957 season | Signed | Bob Gibson | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1957 season | Signed | Tony Gonzalez | — | Cincinnati Reds | Amateur free agent signing |
| before the 1957 season | Signed | Julio Gotay | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1957 season | Signed | Bill Graham | — | Detroit Tigers | Amateur free agent signing |
| before the 1957 season | Signed | Jack Hamilton | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1957 season | Signed | Jay Hankins | — | Kansas City Athletics | Amateur free agent signing |
| before the 1957 season | Signed | Chuck Hiller | — | Cleveland Indians | Amateur free agent signing |
| before the 1957 season | Signed | Joe Hoerner | — | Chicago White Sox | Amateur free agent signing |
| before the 1957 season | Signed | Lou Jackson | — | Chicago Cubs | Amateur free agent signing |
| before the 1957 season | Signed | Stan Johnson | — | Chicago White Sox | Amateur free agent signing |
| before the 1957 season | Signed as free agent | John Kennedy | — | Philadelphia Phillies | Free agent signing |
| before the 1957 season | Signed | Lou Klimchock | — | Kansas City Athletics | Amateur free agent signing |
| before the 1957 season | Signed | Hal Kolstad | — | Boston Red Sox | Amateur free agent signing |
| before the 1957 season | Signed | Dick Lines | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1957 season | Signed | Phil Linz | — | New York Yankees | Amateur free agent signing |
| before the 1957 season | Signed | Juan Marichal | — | New York Giants | Amateur free agent signing |
| before the 1957 season | Signed | Hector Martinez | — | Milwaukee Braves | Amateur free agent signing |
| before the 1957 season | Signed | Dick McAuliffe | — | Detroit Tigers | Amateur free agent signing |
| before the 1957 season | Released | Don Minnick | Cleveland Indians | — | Release |
| before the 1957 season | Signed | Manny Montejo | — | Cincinnati Reds | Amateur free agent signing |
| before the 1957 season | Signed | Jackie Moore | — | Detroit Tigers | Amateur free agent signing |
| before the 1957 season | Signed | Merlin Nippert | — | Boston Red Sox | Amateur free agent signing |
| before the 1957 season | Signed | Ed Olivares | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1957 season | Signed | John Orsino | — | New York Giants | Amateur free agent signing |
| before the 1957 season | Released | Dan Osinski | Cleveland Indians | — | Release |
| before the 1957 season | Signed | Tom Parsons | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1957 season | Signed | Dan Pfister | — | Kansas City Athletics | Amateur free agent signing |
| before the 1957 season | Signed | Elmo Plaskett | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1957 season | Signed | Don Prince | — | Chicago Cubs | Amateur free agent signing |
| before the 1957 season | Signed | Ed Rakow | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1957 season | Signed | Merritt Ranew | — | Milwaukee Braves | Amateur free agent signing |
| before the 1957 season | Signed | Gordie Richardson | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1957 season | Signed | Dave Ricketts | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1957 season | Signed | Charley Smith | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1957 season | Signed | Dick Smith | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1957 season | Signed | Bill Stafford | — | New York Yankees | Amateur free agent signing |
| before the 1957 season | Signed | Lee Stange | — | Washington Senators | Amateur free agent signing |
| before the 1957 season | Signed | Sandy Valdespino | — | Washington Senators | Amateur free agent signing |
| before the 1957 season | Signed | Carl Warwick | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1957 season | Signed as free agent | Fred Whitfield | — | Baltimore Orioles | Free agent signing |
| before the 1957 season | Signed | Bobby Wine | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1957 season | Signed | Jake Wood | — | Detroit Tigers | Amateur free agent signing |
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.