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The 1948 season’s official transaction log: 284 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 29, 1948 | Released | Augie Galan | Cincinnati Reds | — | Release |
| Dec 24, 1948 | Trade | Leon Brinkopf | Dallas | Chicago Cubs | Trade |
| Dec 24, 1948 | Trade | Roy Easterwood | Chicago Cubs | Dallas | Trade |
| Dec 23, 1948 | Signed | Chet Nichols | — | Boston Braves | Amateur free agent signing |
| Dec 15, 1948 | Trade | Pete Reiser | Brooklyn Dodgers | Boston Braves | Trade |
| Dec 15, 1948 | Trade | Nanny Fernandez | Boston Braves | Brooklyn Dodgers | Trade |
| Dec 15, 1948 | Trade | Mike McCormick | Boston Braves | Brooklyn Dodgers | Trade |
| Dec 14, 1948 | Trade | Monk Dubiel | Philadelphia Phillies | Chicago Cubs | Trade |
| Dec 14, 1948 | Trade | Dutch Leonard | Philadelphia Phillies | Chicago Cubs | Trade |
| Dec 14, 1948 | Trade | Hank Borowy | Chicago Cubs | Philadelphia Phillies | Trade |
| Dec 14, 1948 | Trade | Eddie Waitkus | Chicago Cubs | Philadelphia Phillies | Trade |
| Dec 14, 1948 | Trade | Ed Klieman | Cleveland Indians | Washington Senators | Trade |
| Dec 14, 1948 | Trade | Joe Haynes | Cleveland Indians | Washington Senators | Trade |
| Dec 14, 1948 | Trade | Eddie Robinson | Cleveland Indians | Washington Senators | Trade |
| Dec 14, 1948 | Trade | Mickey Vernon | Washington Senators | Cleveland Indians | Trade |
| Dec 14, 1948 | Trade | Early Wynn | Washington Senators | Cleveland Indians | Trade |
| Dec 14, 1948 | Trade | Jim Delsing | Chicago White Sox | New York Yankees | Trade |
| Dec 14, 1948 | Trade | Bud Souchock | New York Yankees | Chicago White Sox | Trade |
| Dec 13, 1948 | Trade | Unnamed | New York Yankees | St. Louis Browns | $100000 |
| Dec 13, 1948 | Trade | Roy Partee | St. Louis Browns | New York Yankees | Trade |
| Dec 13, 1948 | Trade | Fred Sanford | St. Louis Browns | New York Yankees | Trade |
| Dec 13, 1948 | Trade | Sherm Lollar | New York Yankees | St. Louis Browns | Trade |
| Dec 13, 1948 | Trade | Red Embree | New York Yankees | St. Louis Browns | Trade |
| Dec 13, 1948 | Trade | Dick Starr | New York Yankees | St. Louis Browns | Trade |
| Dec 8, 1948 | Trade | Cal McLish | Pittsburgh Pirates | Chicago Cubs | Trade |
| Dec 8, 1948 | Trade | Frankie Gustine | Pittsburgh Pirates | Chicago Cubs | Trade |
| Dec 8, 1948 | Trade | Clyde McCullough | Chicago Cubs | Pittsburgh Pirates | Trade |
| Dec 8, 1948 | Trade | Cliff Chambers | Chicago Cubs | Pittsburgh Pirates | Trade |
| Dec 4, 1948 | Released | Al Benton | Detroit Tigers | — | Release |
| Dec 3, 1948 | Released | Frankie Crosetti | New York Yankees | — | Release |
| Dec 2, 1948 | Trade | Bob Kuzava | Cleveland Indians | Chicago White Sox | Trade |
| Dec 2, 1948 | Trade | Ernest Groth | Cleveland Indians | Chicago White Sox | Trade |
| Dec 2, 1948 | Trade | Frank Papish | Chicago White Sox | Cleveland Indians | Trade |
| Dec 1, 1948 | Signed as free agent | Wally Moses | — | Philadelphia Athletics | Free agent signing (date approximate, per the source) |
| Dec 1948 | Trade | Heinz Becker | Boston Braves | Seattle | Trade |
| Dec 1948 | Trade | Ebba St. Claire | Pittsburgh Pirates | Atlanta | Trade (date approximate, per the source) |
| Dec 1948 | Trade | Charles Glock | Atlanta | Pittsburgh Pirates | Trade (date approximate, per the source) |
| Nov 24, 1948 | Trade | Joe Haynes | Chicago White Sox | Cleveland Indians | Trade |
| Nov 24, 1948 | Trade | Joe Tipton | Cleveland Indians | Chicago White Sox | Trade |
| Nov 15, 1948 | Signed as free agent | Paul Hinrichs | — | New York Yankees | Free agent signing |
| Nov 15, 1948 | Released | Wally Moses | Boston Red Sox | — | Release |
| Nov 10, 1948 | Trade | Unnamed | Detroit Tigers | Chicago White Sox | $10000 |
| Nov 10, 1948 | Trade | Aaron Robinson | Chicago White Sox | Detroit Tigers | Trade |
| Nov 10, 1948 | Trade | Billy Pierce | Detroit Tigers | Chicago White Sox | Trade |
| Nov 8, 1948 | Signed | Bob Speake | — | Chicago Cubs | Amateur free agent signing |
| Oct 29, 1948 | Released | Joe Schultz | St. Louis Browns | — | Release |
| Oct 28, 1948 | Released | Frank McCormick | Boston Braves | — | Release |
| Oct 28, 1948 | Released | Ernie White | Boston Braves | — | Release |
| Oct 15, 1948 | Released | George McQuinn | New York Yankees | — | Release |
| Oct 8, 1948 | Released | Terry Moore | St. Louis Cardinals | — | Release |
| Oct 5, 1948 | Released | Russ Bauers | Chicago Cubs | — | Release |
| Oct 4, 1948 | Released | Herman Franks | Philadelphia Athletics | — | Release |
| Oct 4, 1948 | Released | Wally Holborow | Philadelphia Athletics | — | Release |
| Oct 4, 1948 | Released | Fritz Ostermueller | Pittsburgh Pirates | — | Release |
| Oct 4, 1948 | Released | Skeeter Webb | Philadelphia Athletics | — | Release |
| Oct 4, 1948 | Released | Rudy York | Philadelphia Athletics | — | Release |
| Oct 4, 1948 | Released | Babe Young | St. Louis Cardinals | — | Release |
| Oct 4, 1948 | Trade | Unnamed | Washington Senators | St. Louis Browns | $25000 |
| Oct 4, 1948 | Trade | Sam Dente | St. Louis Browns | Washington Senators | Trade |
| Oct 4, 1948 | Trade | Tom Ferrick | Washington Senators | St. Louis Browns | Trade |
| Oct 4, 1948 | Trade | John Sullivan | Washington Senators | St. Louis Browns | Trade |
| Oct 4, 1948 | Trade | Harry Walker | Philadelphia Phillies | Chicago Cubs | Trade |
| Oct 4, 1948 | Trade | Bill Nicholson | Chicago Cubs | Philadelphia Phillies | Trade |
| Oct 3, 1948 | Released | Lonny Frey | New York Giants | — | Release |
| Oct 3, 1948 | Released | Johnny McCarthy | New York Giants | — | Release |
| Oct 2, 1948 | Released | Johnny Riddle | Pittsburgh Pirates | — | Release |
| Oct 1948 | Trade | Unnamed | New York Giants | Atlanta | $60000 (date approximate, per the source) |
| Oct 1948 | Trade | Lloyd Gearhart | New York Giants | Atlanta | Trade (date approximate, per the source) |
| Oct 1948 | Trade | Dick Hoover | New York Giants | Atlanta | Trade (date approximate, per the source) |
| Oct 1948 | Trade | Davey Williams | Atlanta | New York Giants | Trade (date approximate, per the source) |
| Oct 1948 | Trade | Bob Hall | Seattle | Boston Braves | Trade |
| Oct 1948 | Trade | Al Lyons | Boston Braves | Seattle | Trade |
| Oct 1948 | Trade | Tommy Neill | Boston Braves | Seattle | Trade |
| Oct 1948 | Signed as free agent | Hugh Casey | — | Pittsburgh Pirates | Free agent signing |
| Sep 30, 1948 | Released | Hugh Casey | Brooklyn Dodgers | — | Release |
| Sep 30, 1948 | Released | Joe Medwick | St. Louis Cardinals | — | Release |
| Sep 30, 1948 | Released | Arky Vaughan | Brooklyn Dodgers | — | Release |
| Sep 29, 1948 | Trade | Unnamed | Cincinnati Reds | Brooklyn Dodgers | $ |
| Sep 29, 1948 | Trade | Jimmy Bloodworth | Brooklyn Dodgers | Cincinnati Reds | Trade |
| Sep 27, 1948 | Trade | Steve Nagy | Pittsburgh Pirates | San Francisco | Trade |
| Sep 27, 1948 | Trade | Clyde Vollmer | Cincinnati Reds | Washington Senators | Trade |
| Sep 27, 1948 | Trade | Carden Gillenwater | Washington Senators | Cincinnati Reds | Trade |
| Sep 21, 1948 | Released | Bucky Walters | Cincinnati Reds | — | Release |
| Sep 21, 1948 | Trade | Unnamed | Pittsburgh Pirates | San Francisco | $ |
| Sep 21, 1948 | Trade | Bill Werle | San Francisco | Pittsburgh Pirates | Trade |
| Sep 17, 1948 | Released | Sam Nahem | Philadelphia Phillies | — | Release |
| Sep 17, 1948 | Released | Don Padgett | Philadelphia Phillies | — | Release |
| Sep 7, 1948 | Signed as free agent | Danny Lynch | — | Chicago Cubs | Free agent signing |
| Aug 30, 1948 | Signed as free agent | Wally Holborow | — | Philadelphia Athletics | Free agent signing |
| Jul 30, 1948 | Released | Mort Cooper | New York Giants | — | Release |
| Jul 26, 1948 | Trade | Ken Burkhart | St. Louis Cardinals | Cincinnati Reds | Trade |
| Jul 26, 1948 | Trade | Babe Young | Cincinnati Reds | St. Louis Cardinals | Trade |
| Jul 11, 1948 | Signed as free agent | Sam Jethroe | — | Brooklyn Dodgers | Free agent signing with first major-league team |
| Jul 11, 1948 | Signed as free agent | Al Smith | — | Cleveland Indians | Free agent signing with first major-league team |
| Jul 7, 1948 | Signed as free agent | Satchel Paige | — | Cleveland Indians | Free agent signing with first major-league team |
| Jul 4, 1948 | Signed | Marv Rotblatt | — | Chicago White Sox | Amateur free agent signing |
| Jul 3, 1948 | Signed as free agent | Les McCrabb | — | Philadelphia Athletics | Free agent signing |
| Jul 1948 | Signed | Carl Linhart | — | Detroit Tigers | Amateur free agent signing (date approximate, per the source) |
| Jun 29, 1948 | Signed | Johnny Antonelli | — | Boston Braves | Amateur free agent signing |
| Jun 29, 1948 | Signed | Wally Hood | — | New York Yankees | Amateur free agent signing |
| Jun 26, 1948 | Signed | Ed Winceniak | — | Chicago Cubs | Amateur free agent signing |
| Jun 20, 1948 | Signed as free agent | Nels Potter | — | Boston Braves | Free agent signing |
| Jun 19, 1948 | Released | Thornton Lee | New York Giants | — | Release |
| Jun 19, 1948 | Released | Bobo Newsom | New York Giants | — | Release |
| Jun 16, 1948 | Signed | Earle Brucker | — | Philadelphia Athletics | Amateur free agent signing |
| Jun 15, 1948 | Signed | Jerry McCarthy | — | St. Louis Browns | Amateur free agent signing (date approximate, per the source) |
| Jun 15, 1948 | Trade | Unnamed | Cleveland Indians | St. Louis Browns | $100000 |
| Jun 15, 1948 | Trade | Sam Zoldak | St. Louis Browns | Cleveland Indians | Trade |
| Jun 15, 1948 | Trade | Bill Kennedy | Cleveland Indians | St. Louis Browns | Trade |
| Jun 14, 1948 | Released | Bill Dietrich | Philadelphia Athletics | — | Release |
| Jun 14, 1948 | Released | Nels Potter | Philadelphia Athletics | — | Release |
| Jun 9, 1948 | Trade | Marino Pieretti | Washington Senators | Chicago White Sox | Trade |
| Jun 9, 1948 | Trade | Earl Harrist | Chicago White Sox | Washington Senators | Trade |
| Jun 7, 1948 | Signed | Jim Busby | — | Chicago White Sox | Amateur free agent signing |
| Jun 7, 1948 | Signed | Willard Nixon | — | Boston Red Sox | Amateur free agent signing |
| Jun 7, 1948 | Trade | Milt Byrnes | New York Yankees | Boston Red Sox | Trade |
| Jun 7, 1948 | Trade | Jack Robinson | New York Yankees | Boston Red Sox | Trade |
| Jun 7, 1948 | Trade | Bill Sinton | Boston Red Sox | New York Yankees | Trade |
| Jun 7, 1948 | Trade | Mickey Witek | Boston Red Sox | New York Yankees | Trade |
| Jun 5, 1948 | Trade | Unnamed | Philadelphia Athletics | St. Louis Browns | $20000 |
| Jun 5, 1948 | Trade | Ray Coleman | St. Louis Browns | Philadelphia Athletics | Trade |
| Jun 5, 1948 | Trade | George Binks | Philadelphia Athletics | St. Louis Browns | Trade |
| Jun 3, 1948 | Signed | Danny Lynch | — | Pittsburgh Pirates | Amateur free agent signing |
| Jun 2, 1948 | Trade | Al Gettel | Cleveland Indians | Chicago White Sox | Trade |
| Jun 2, 1948 | Trade | Pat Seerey | Cleveland Indians | Chicago White Sox | Trade |
| Jun 2, 1948 | Trade | Bob Kennedy | Chicago White Sox | Cleveland Indians | Trade |
| May 28, 1948 | Released | Hugh Poland | Cincinnati Reds | — | Release |
| May 28, 1948 | Signed | Tom Sturdivant | — | New York Yankees | Amateur free agent signing |
| May 21, 1948 | Signed as free agent | Elbie Fletcher | — | New York Giants | Free agent signing |
| May 21, 1948 | Signed as free agent | Lonny Frey | — | New York Giants | Free agent signing |
| May 19, 1948 | Released | Doc Cramer | Detroit Tigers | — | Release |
| May 17, 1948 | Released | Lonny Frey | New York Yankees | — | Release |
| May 17, 1948 | Trade | Mickey Witek | New York Giants | Boston Red Sox | Trade |
| May 17, 1948 | Trade | Frank Trechock | New York Giants | Boston Red Sox | Trade |
| May 17, 1948 | Trade | Wes Bailey | Boston Red Sox | New York Giants | Trade |
| May 17, 1948 | Trade | Unnamed | Boston Red Sox | New York Giants | $ |
| May 13, 1948 | Trade | Unnamed | Washington Senators | New York Yankees | $20000 |
| May 13, 1948 | Trade | Leon Culberson | Washington Senators | New York Yankees | Trade |
| May 13, 1948 | Trade | Bud Stewart | New York Yankees | Washington Senators | Trade |
| May 12, 1948 | Signed as free agent | Bud Byerly | — | Cincinnati Reds | Free agent signing (date approximate, per the source) |
| May 11, 1948 | Trade | Marv Rickert | Cincinnati Reds | Boston Braves | Trade |
| May 11, 1948 | Trade | Danny Litwhiler | Boston Braves | Cincinnati Reds | Trade |
| May 10, 1948 | Released | Joe Beggs | New York Giants | — | Release |
| May 10, 1948 | Released | John McHale | Detroit Tigers | — | Release |
| May 8, 1948 | Released | Elbie Fletcher | Cleveland Indians | — | Release |
| May 6, 1948 | Trade | Unnamed | Cleveland Indians | Oakland | $ |
| May 6, 1948 | Trade | George Metkovich | Cleveland Indians | Oakland | Trade |
| May 6, 1948 | Trade | Les Webber | Cleveland Indians | Oakland | Trade |
| May 6, 1948 | Trade | Will Hafey | Oakland | Cleveland Indians | Trade |
| May 5, 1948 | Released | Bud Byerly | St. Louis Cardinals | — | Release |
| May 3, 1948 | Released | Cookie Lavagetto | Brooklyn Dodgers | — | Release |
| Apr 20, 1948 | Released | Vinnie Smith | Pittsburgh Pirates | — | Release |
| Apr 20, 1948 | Trade | Unnamed | Cleveland Indians | St. Louis Browns | $15000 (date approximate, per the source) |
| Apr 19, 1948 | Released | Roy Cullenbine | Philadelphia Phillies | — | Release |
| Apr 18, 1948 | Signed as free agent | Joe Medwick | — | St. Louis Cardinals | Free agent signing |
| Apr 18, 1948 | Trade | Ray Sanders | Brooklyn Dodgers | Boston Braves | Trade |
| Apr 18, 1948 | Trade | Unnamed | Boston Braves | Brooklyn Dodgers | $60000 |
| Apr 16, 1948 | Signed | Vern Morgan | — | Chicago Cubs | Amateur free agent signing |
| Apr 14, 1948 | Signed | Joe Lonnett | — | Philadelphia Phillies | Amateur free agent signing |
| Apr 12, 1948 | Released | Spud Chandler | New York Yankees | — | Release |
| Apr 12, 1948 | Signed as free agent | Bobo Newsom | — | New York Giants | Free agent signing |
| Apr 7, 1948 | Trade | Unnamed | Philadelphia Phillies | St. Louis Cardinals | $30000 |
| Apr 7, 1948 | Trade | Dick Sisler | St. Louis Cardinals | Philadelphia Phillies | Trade |
| Apr 7, 1948 | Trade | Ralph LaPointe | Philadelphia Phillies | St. Louis Cardinals | Trade |
| Apr 3, 1948 | Signed as free agent | Thornton Lee | — | New York Giants | Free agent signing |
| Mar 19, 1948 | Released | Wally Holborow | Washington Senators | — | Release |
| Mar 6, 1948 | Trade | Unnamed | Boston Braves | Brooklyn Dodgers | $40000 |
| Mar 6, 1948 | Trade | Eddie Stanky | Brooklyn Dodgers | Boston Braves | Trade |
| Mar 6, 1948 | Trade | Bama Rowell | Boston Braves | Brooklyn Dodgers | Trade |
| Mar 6, 1948 | Trade | Ray Sanders | Boston Braves | Brooklyn Dodgers | Trade |
| Mar 1, 1948 | Released | Jim Tabor | Philadelphia Phillies | — | Release |
| Mar 1, 1948 | Trade | Bobby Sturgeon | Chicago Cubs | Boston Braves | Trade |
| Mar 1, 1948 | Trade | Dick Culler | Boston Braves | Chicago Cubs | Trade |
| Mar 1, 1948 | Trade | Walt Lanfranconi | Boston Braves | Chicago Cubs | Trade |
| Mar 1948 | Signed as free agent | Bob Buhl | — | Boston Braves | Free agent signing (date approximate, per the source) |
| Feb 27, 1948 | Released | Art Lopatka | Philadelphia Phillies | — | Release |
| Feb 24, 1948 | Trade | Bill Wight | New York Yankees | Chicago White Sox | Trade |
| Feb 24, 1948 | Trade | Fred Bradley | New York Yankees | Chicago White Sox | Trade |
| Feb 24, 1948 | Trade | Aaron Robinson | New York Yankees | Chicago White Sox | Trade |
| Feb 24, 1948 | Trade | Eddie Lopat | Chicago White Sox | New York Yankees | Trade |
| Feb 12, 1948 | Signed as free agent | Rudy York | — | Philadelphia Athletics | Free agent signing |
| Feb 7, 1948 | Trade | Unnamed | Philadelphia Phillies | Cincinnati Reds | $ |
| Feb 7, 1948 | Trade | Johnny Wyrostek | Philadelphia Phillies | Cincinnati Reds | Trade |
| Feb 7, 1948 | Trade | Eddie Miller | Cincinnati Reds | Philadelphia Phillies | Trade |
| Feb 6, 1948 | Released | Bobo Newsom | New York Yankees | — | Release |
| Feb 2, 1948 | Released | Rudy York | Chicago White Sox | — | Release |
| Jan 27, 1948 | Trade | Ralph Weigel | Cleveland Indians | Chicago White Sox | Trade |
| Jan 27, 1948 | Trade | Thurman Tucker | Chicago White Sox | Cleveland Indians | Trade |
| Jan 15, 1948 | Trade | Dixie Howell | Pittsburgh Pirates | San Francisco | Trade |
| before the 1948 season | Signed | Bill Abernathie | — | Cleveland Indians | Amateur free agent signing |
| before the 1948 season | Signed | Tom Acker | — | New York Giants | Amateur free agent signing |
| before the 1948 season | Signed | Hal Bevan | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1948 season | Signed | Milt Bolling | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed | Wally Burnette | — | New York Yankees | Amateur free agent signing |
| before the 1948 season | Signed | Art Ceccarelli | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1948 season | Signed | Al Cicotte | — | New York Yankees | Amateur free agent signing |
| before the 1948 season | Signed | Hy Cohen | — | New York Yankees | Amateur free agent signing |
| before the 1948 season | Signed | Dave Cole | — | Boston Braves | Amateur free agent signing |
| before the 1948 season | Signed | Dale Coogan | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1948 season | Signed | Al Corwin | — | New York Giants | Amateur free agent signing |
| before the 1948 season | Signed | Del Crandall | — | Boston Braves | Amateur free agent signing |
| before the 1948 season | Signed | Jerry Dahlke | — | Chicago White Sox | Amateur free agent signing |
| before the 1948 season | Signed | Pete Daley | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed | Harold Daugherty | — | Detroit Tigers | Amateur free agent signing |
| before the 1948 season | Signed | Ike Delock | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed | Art Ditmar | — | Philadelphia Athletics | Amateur free agent signing |
| before the 1948 season | Signed | Jim Finigan | — | New York Yankees | Amateur free agent signing |
| before the 1948 season | Signed | Bill Fischer | — | Chicago White Sox | Amateur free agent signing |
| before the 1948 season | Signed | George Freese | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1948 season | Signed | Hersh Freeman | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed | Jim Fridley | — | Cleveland Indians | Amateur free agent signing |
| before the 1948 season | Signed | Bob Garber | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1948 season | Signed | Tommy Giordano | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1948 season | Signed | Bob Grim | — | New York Yankees | Amateur free agent signing |
| before the 1948 season | Signed | Harry Hanebrink | — | Boston Braves | Amateur free agent signing |
| before the 1948 season | Signed | Gail Henley | — | New York Giants | Amateur free agent signing |
| before the 1948 season | Signed as free agent | Bobby Herrera | — | St. Louis Browns | Free agent signing with first major-league team |
| before the 1948 season | Signed | Stan Hollmig | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1948 season | Signed as free agent | Cal Howe | — | Chicago Cubs | Free agent signing |
| before the 1948 season | Signed | Billy Hunter | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1948 season | Signed | Milt Jordan | — | Detroit Tigers | Amateur free agent signing |
| before the 1948 season | Signed | Niles Jordan | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1948 season | Signed | Hal Keller | — | Washington Senators | Amateur free agent signing |
| before the 1948 season | Signed | Leo Kiely | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed | Mike Kume | — | Philadelphia Athletics | Amateur free agent signing |
| before the 1948 season | Signed | Ken Landenberger | — | Chicago White Sox | Amateur free agent signing |
| before the 1948 season | Signed | Jerry Lane | — | Boston Braves | Amateur free agent signing |
| before the 1948 season | Signed | Vern Law | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1948 season | Signed | Jim Lemon | — | Cleveland Indians | Amateur free agent signing |
| before the 1948 season | Signed | Dan Lewandowski | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1948 season | Signed | Jack Littrell | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed | Billy Loes | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1948 season | Signed | Dick Marlowe | — | Detroit Tigers | Amateur free agent signing |
| before the 1948 season | Signed | Fred Marolewski | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1948 season | Signed | Gil McDougald | — | New York Yankees | Amateur free agent signing |
| before the 1948 season | Signed | Ed McGhee | — | Chicago White Sox | Amateur free agent signing |
| before the 1948 season | Signed | Bob Miller | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1948 season | Signed | Rudy Minarcin | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1948 season | Signed | Minnie Miñoso | — | Cleveland Indians | Amateur free agent signing |
| before the 1948 season | Signed | Willy Miranda | — | Washington Senators | Amateur free agent signing |
| before the 1948 season | Signed | Walt Moryn | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1948 season | Signed | Ray Narleski | — | Cleveland Indians | Amateur free agent signing |
| before the 1948 season | Signed | Don Nicholas | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1948 season | Signed | Bob Nieman | — | Cincinnati Reds | Amateur free agent signing |
| before the 1948 season | Signed | Karl Olson | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed | Phil Paine | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1948 season | Released | Jim Pearce | Chicago Cubs | — | Release |
| before the 1948 season | Signed | Jim Piersall | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed | Joe Pignatano | — | Brooklyn Dodgers | Amateur free agent signing |
| before the 1948 season | Signed | Al Pilarcik | — | New York Yankees | Amateur free agent signing |
| before the 1948 season | Signed | Carl Powis | — | St. Louis Browns | Amateur free agent signing |
| before the 1948 season | Signed | Joe Presko | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1948 season | Signed | Bob Purkey | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1948 season | Signed | Frank Quinn | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed | Bob Rinker | — | Philadelphia Athletics | Amateur free agent signing |
| before the 1948 season | Signed | Robin Roberts | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1948 season | Signed | Tony Roig | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1948 season | Signed | Dutch Romberger | — | Philadelphia Athletics | Amateur free agent signing |
| before the 1948 season | Signed | Rudy Rufer | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1948 season | Signed | Ron Samford | — | New York Giants | Amateur free agent signing |
| before the 1948 season | Signed | Jack Sanford | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1948 season | Signed | José Santiago | — | Cleveland Indians | Amateur free agent signing |
| before the 1948 season | Signed | Frank Saucier | — | St. Louis Browns | Amateur free agent signing |
| before the 1948 season | Signed | Moe Savransky | — | Cincinnati Reds | Amateur free agent signing |
| before the 1948 season | Signed | Danny Schell | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1948 season | Signed | Art Schult | — | New York Yankees | Amateur free agent signing |
| before the 1948 season | Signed | Billy Shantz | — | Philadelphia Athletics | Amateur free agent signing |
| before the 1948 season | Signed | Bobby Shantz | — | Philadelphia Athletics | Amateur free agent signing |
| before the 1948 season | Signed | Bob Smith | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed | George Spencer | — | New York Giants | Amateur free agent signing |
| before the 1948 season | Signed | Frank Sullivan | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed | Wayne Terwilliger | — | Chicago Cubs | Amateur free agent signing |
| before the 1948 season | Released | Hank Thompson | St. Louis Browns | — | Release |
| before the 1948 season | Signed | Bobby Tiefenauer | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1948 season | Signed | Gus Triandos | — | New York Yankees | Amateur free agent signing |
| before the 1948 season | Signed | Bob Turley | — | St. Louis Browns | Amateur free agent signing |
| before the 1948 season | Signed | Bill Upton | — | Cleveland Indians | Amateur free agent signing |
| before the 1948 season | Signed | Corky Valentine | — | Cincinnati Reds | Amateur free agent signing |
| before the 1948 season | Signed | Buck Varner | — | Washington Senators | Amateur free agent signing |
| before the 1948 season | Signed | Lee Wheat | — | Cleveland Indians | Amateur free agent signing |
| before the 1948 season | Signed | Hank Workman | — | New York Yankees | Amateur free agent signing |
| before the 1948 season | Signed | Dick Young | — | Philadelphia Phillies | Amateur free agent signing |
| before the 1948 season | Signed | Norm Zauchin | — | Boston Red Sox | Amateur free agent signing |
| before the 1948 season | Signed as free agent | Ike Pearson | — | Chicago White Sox | 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.