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The 1970 season’s official transaction log: 334 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 30, 1970 | Trade | Dave McDonald | Montreal Expos | San Francisco Giants | Trade |
| Dec 30, 1970 | Trade | Ron Hunt | San Francisco Giants | Montreal Expos | Trade |
| Dec 28, 1970 | Released | Tommy Davis | Chicago Cubs | — | Release |
| Dec 25, 1970 | Signed | Bo Diaz | — | Boston Red Sox | Amateur free agent signing |
| Dec 22, 1970 | Released | Don Cardwell | Atlanta Braves | — | Release |
| Dec 16, 1970 | Trade | Grant Jackson | Philadelphia Phillies | Baltimore Orioles | Trade |
| Dec 16, 1970 | Trade | Jim Hutto | Philadelphia Phillies | Baltimore Orioles | Trade |
| Dec 16, 1970 | Trade | Sam Parrilla | Philadelphia Phillies | Baltimore Orioles | Trade |
| Dec 16, 1970 | Trade | Roger Freed | Baltimore Orioles | Philadelphia Phillies | Trade |
| Dec 15, 1970 | Trade | Greg Garrett | California Angels | Cincinnati Reds | Trade |
| Dec 15, 1970 | Trade | Jim Maloney | Cincinnati Reds | California Angels | Trade |
| Dec 12, 1970 | Released | Lee Stange | Chicago White Sox | — | Release |
| Dec 11, 1970 | Trade | Duke Sims | Cleveland Indians | Los Angeles Dodgers | Trade |
| Dec 11, 1970 | Trade | Alan Foster | Los Angeles Dodgers | Cleveland Indians | Trade |
| Dec 11, 1970 | Trade | Ray Lamb | Los Angeles Dodgers | Cleveland Indians | Trade |
| Dec 4, 1970 | Trade | Steve Huntz | San Diego Padres | San Francisco Giants | Trade |
| Dec 4, 1970 | Trade | Don Mason | San Francisco Giants | San Diego Padres | Trade |
| Dec 4, 1970 | Trade | William Frost | San Francisco Giants | San Diego Padres | Trade |
| Dec 3, 1970 | Trade | Bill Robinson | New York Yankees | Chicago White Sox | Trade |
| Dec 3, 1970 | Trade | Barry Moore | Chicago White Sox | New York Yankees | Trade |
| Dec 3, 1970 | Trade | Carmen Fanzone | Boston Red Sox | Chicago Cubs | Trade |
| Dec 3, 1970 | Trade | Phil Gagliano | Chicago Cubs | Boston Red Sox | Trade |
| Dec 2, 1970 | Trade | Bob Tillman | Atlanta Braves | Milwaukee Brewers | Trade |
| Dec 2, 1970 | Trade | Hank Allen | Milwaukee Brewers | Atlanta Braves | Trade |
| Dec 2, 1970 | Trade | Paul Click | Milwaukee Brewers | Atlanta Braves | Trade |
| Dec 2, 1970 | Trade | John Ryan | Milwaukee Brewers | Atlanta Braves | Trade |
| Dec 2, 1970 | Trade | Freddie Patek | Pittsburgh Pirates | Kansas City Royals | Trade |
| Dec 2, 1970 | Trade | Bruce Dal Canton | Pittsburgh Pirates | Kansas City Royals | Trade |
| Dec 2, 1970 | Trade | Jerry May | Pittsburgh Pirates | Kansas City Royals | Trade |
| Dec 2, 1970 | Trade | Bob Johnson | Kansas City Royals | Pittsburgh Pirates | Trade |
| Dec 2, 1970 | Trade | Jackie Hernandez | Kansas City Royals | Pittsburgh Pirates | Trade |
| Dec 2, 1970 | Trade | Jim Campanis | Kansas City Royals | Pittsburgh Pirates | Trade |
| Dec 2, 1970 | Trade | Tom Hilgendorf | St. Louis Cardinals | Kansas City Royals | Trade |
| Dec 2, 1970 | Trade | Ike Brookens | Kansas City Royals | St. Louis Cardinals | Trade |
| Dec 1, 1970 | Trade | Bob Aspromonte | Atlanta Braves | New York Mets | Trade |
| Dec 1, 1970 | Trade | Ron Herbel | New York Mets | Atlanta Braves | Trade |
| Dec 1, 1970 | Trade | Pat Dobson | San Diego Padres | Baltimore Orioles | Trade |
| Dec 1, 1970 | Trade | Tom Dukes | San Diego Padres | Baltimore Orioles | Trade |
| Dec 1, 1970 | Trade | Tom Phoebus | Baltimore Orioles | San Diego Padres | Trade |
| Dec 1, 1970 | Trade | Al Severinsen | Baltimore Orioles | San Diego Padres | Trade |
| Dec 1, 1970 | Trade | Fred Beene | Baltimore Orioles | San Diego Padres | Trade |
| Dec 1, 1970 | Trade | Enzo Hernandez | Baltimore Orioles | San Diego Padres | Trade |
| Dec 1, 1970 | Trade | Luis Aparicio | Chicago White Sox | Boston Red Sox | Trade |
| Dec 1, 1970 | Trade | Mike Andrews | Boston Red Sox | Chicago White Sox | Trade |
| Dec 1, 1970 | Trade | Luis Alvarado | Boston Red Sox | Chicago White Sox | Trade |
| Nov 30, 1970 | Trade | Hal Breeden | Atlanta Braves | Chicago Cubs | Trade |
| Nov 30, 1970 | Trade | Hoyt Wilhelm | Chicago Cubs | Atlanta Braves | Trade |
| Nov 30, 1970 | Trade | Danny Breeden | Cincinnati Reds | Chicago Cubs | Trade |
| Nov 30, 1970 | Trade | Willie Smith | Chicago Cubs | Cincinnati Reds | Trade |
| Nov 30, 1970 | Trade | Jerry DaVanon | St. Louis Cardinals | Baltimore Orioles | Trade |
| Nov 30, 1970 | Trade | Moe Drabowsky | Baltimore Orioles | St. Louis Cardinals | Trade |
| Nov 30, 1970 | Trade | Pat Jacquez | Chicago Cubs | Chicago White Sox | Trade |
| Nov 30, 1970 | Trade | Dave Lemonds | Chicago Cubs | Chicago White Sox | Trade |
| Nov 30, 1970 | Trade | Roe Skidmore | Chicago Cubs | Chicago White Sox | Trade |
| Nov 30, 1970 | Trade | Jose Ortiz | Chicago White Sox | Chicago Cubs | Trade |
| Nov 30, 1970 | Trade | Ossie Blanco | Chicago White Sox | Chicago Cubs | Trade |
| Nov 30, 1970 | Trade | Jay Johnstone | California Angels | Chicago White Sox | Trade |
| Nov 30, 1970 | Trade | Tom Egan | California Angels | Chicago White Sox | Trade |
| Nov 30, 1970 | Trade | Tom Bradley | California Angels | Chicago White Sox | Trade |
| Nov 30, 1970 | Trade | Ken Berry | Chicago White Sox | California Angels | Trade |
| Nov 30, 1970 | Trade | Syd O'Brien | Chicago White Sox | California Angels | Trade |
| Nov 30, 1970 | Trade | Billy Wynne | Chicago White Sox | California Angels | Trade |
| Nov 24, 1970 | Signed | Gil Flores | — | Baltimore Orioles | Amateur free agent signing |
| Nov 10, 1970 | Released | Mike Hershberger | Milwaukee Brewers | — | Release |
| Nov 3, 1970 | Trade | Greg Goossen | Washington Senators | Philadelphia Phillies | Trade |
| Nov 3, 1970 | Trade | Jeff Terpko | Washington Senators | Philadelphia Phillies | Trade |
| Nov 3, 1970 | Trade | Gene Martin | Washington Senators | Philadelphia Phillies | Trade |
| Nov 3, 1970 | Trade | Curt Flood | Philadelphia Phillies | Washington Senators | Trade |
| Oct 28, 1970 | Released | Jimmie Hall | Atlanta Braves | — | Release |
| Oct 27, 1970 | Released | Tito Francona | Milwaukee Brewers | — | Release |
| Oct 26, 1970 | Released | Joe Gibbon | Pittsburgh Pirates | — | Release |
| Oct 24, 1970 | Signed | Bill Castro | — | Milwaukee Brewers | Amateur free agent signing |
| Oct 24, 1970 | Signed | Sam Mejias | — | Milwaukee Brewers | Amateur free agent signing |
| Oct 21, 1970 | Trade | John Burns | Atlanta Braves | California Angels | Trade |
| Oct 21, 1970 | Trade | Marty Perez | California Angels | Atlanta Braves | Trade |
| Oct 21, 1970 | Trade | Jim Campbell | St. Louis Cardinals | Boston Red Sox | Trade |
| Oct 21, 1970 | Trade | Dick Schofield | Boston Red Sox | St. Louis Cardinals | Trade |
| Oct 20, 1970 | Released | Max Alvis | Milwaukee Brewers | — | Release |
| Oct 20, 1970 | Trade | Rod Gaspar | New York Mets | San Diego Padres | Trade |
| Oct 20, 1970 | Trade | Angel Mangual | Pittsburgh Pirates | Oakland Athletics | Trade |
| Oct 20, 1970 | Trade | Herman Hill | Minnesota Twins | St. Louis Cardinals | Trade |
| Oct 20, 1970 | Trade | Bob Wissler | Minnesota Twins | St. Louis Cardinals | Trade |
| Oct 20, 1970 | Trade | Sal Campisi | St. Louis Cardinals | Minnesota Twins | Trade |
| Oct 20, 1970 | Trade | Jim Kennedy | St. Louis Cardinals | Minnesota Twins | Trade |
| Oct 20, 1970 | Trade | Jerry McNertney | Milwaukee Brewers | St. Louis Cardinals | Trade |
| Oct 20, 1970 | Trade | George Lauzerique | Milwaukee Brewers | St. Louis Cardinals | Trade |
| Oct 20, 1970 | Trade | Jessie Huggins | Milwaukee Brewers | St. Louis Cardinals | Trade |
| Oct 20, 1970 | Trade | Carl Taylor | St. Louis Cardinals | Milwaukee Brewers | Trade |
| Oct 20, 1970 | Trade | Jim Ellis | St. Louis Cardinals | Milwaukee Brewers | Trade |
| Oct 19, 1970 | Trade | Fran Healy | Kansas City Royals | San Francisco Giants | Trade |
| Oct 19, 1970 | Trade | Bob Garibaldi | San Francisco Giants | Kansas City Royals | Trade |
| Oct 15, 1970 | Trade | Jerry Branch | Pittsburgh Pirates | New York Yankees | Trade |
| Oct 15, 1970 | Trade | Thomas Frondorf | Pittsburgh Pirates | New York Yankees | Trade |
| Oct 15, 1970 | Trade | Ed Pacheco | Pittsburgh Pirates | New York Yankees | Trade |
| Oct 15, 1970 | Trade | Charlie Sands | New York Yankees | Pittsburgh Pirates | Trade |
| Oct 15, 1970 | Trade | Dave Kent | New York Yankees | Pittsburgh Pirates | Trade |
| Oct 15, 1970 | Trade | Gary Washington | New York Yankees | Pittsburgh Pirates | Trade |
| Oct 13, 1970 | Trade | Gail Hopkins | Chicago White Sox | Kansas City Royals | Trade |
| Oct 13, 1970 | Trade | John Matias | Chicago White Sox | Kansas City Royals | Trade |
| Oct 13, 1970 | Trade | Pat Kelly | Kansas City Royals | Chicago White Sox | Trade |
| Oct 13, 1970 | Trade | Don O'Riley | Kansas City Royals | Chicago White Sox | Trade |
| Oct 12, 1970 | Signed as free agent | Jesus Hernaiz | — | Philadelphia Phillies | Free agent signing |
| Oct 12, 1970 | Trade | Hector Torres | Houston Astros | Chicago Cubs | Trade |
| Oct 12, 1970 | Trade | Roger Metzger | Chicago Cubs | Houston Astros | Trade |
| Oct 11, 1970 | Trade | Tony Conigliaro | Boston Red Sox | California Angels | Trade |
| Oct 11, 1970 | Trade | Ray Jarvis | Boston Red Sox | California Angels | Trade |
| Oct 11, 1970 | Trade | Jerry Moses | Boston Red Sox | California Angels | Trade |
| Oct 11, 1970 | Trade | Ken Tatum | California Angels | Boston Red Sox | Trade |
| Oct 11, 1970 | Trade | Jarvis Tatum | California Angels | Boston Red Sox | Trade |
| Oct 11, 1970 | Trade | Doug Griffin | California Angels | Boston Red Sox | Trade |
| Oct 9, 1970 | Trade | Ed Brinkman | Washington Senators | Detroit Tigers | Trade |
| Oct 9, 1970 | Trade | Aurelio Rodriguez | Washington Senators | Detroit Tigers | Trade |
| Oct 9, 1970 | Trade | Joe Coleman | Washington Senators | Detroit Tigers | Trade |
| Oct 9, 1970 | Trade | Jim Hannan | Washington Senators | Detroit Tigers | Trade |
| Oct 9, 1970 | Trade | Denny McLain | Detroit Tigers | Washington Senators | Trade |
| Oct 9, 1970 | Trade | Don Wert | Detroit Tigers | Washington Senators | Trade |
| Oct 9, 1970 | Trade | Norm McRae | Detroit Tigers | Washington Senators | Trade |
| Oct 9, 1970 | Trade | Elliott Maddox | Detroit Tigers | Washington Senators | Trade |
| Oct 9, 1970 | Trade | John Purdin | California Angels | Chicago White Sox | Trade |
| Oct 9, 1970 | Trade | Fred Rath | Chicago White Sox | California Angels | Trade |
| Oct 7, 1970 | Released | Doc Edwards | Philadelphia Phillies | — | Release |
| Oct 6, 1970 | Released | Harvey Kuenn | Milwaukee Brewers | — | Release |
| Oct 6, 1970 | Trade | Al Yates | Boston Red Sox | Milwaukee Brewers | Trade |
| Oct 6, 1970 | Trade | Billy McCool | St. Louis Cardinals | Boston Red Sox | Trade (date approximate, per the source) |
| Oct 6, 1970 | Trade | Bill Landis | Boston Red Sox | St. Louis Cardinals | Trade (date approximate, per the source) |
| Oct 5, 1970 | Trade | Dick Allen | St. Louis Cardinals | Los Angeles Dodgers | Trade |
| Oct 5, 1970 | Trade | Ted Sizemore | Los Angeles Dodgers | St. Louis Cardinals | Trade |
| Oct 5, 1970 | Trade | Bob Stinson | Los Angeles Dodgers | St. Louis Cardinals | Trade |
| Oct 1, 1970 | Signed | Sixto Lezcano | — | Milwaukee Brewers | Amateur free agent signing |
| Sep 30, 1970 | Signed | Nino Espinosa | — | New York Mets | Amateur free agent signing |
| Sep 25, 1970 | Signed | Bill Campbell | — | Minnesota Twins | Amateur free agent signing |
| Sep 23, 1970 | Trade | Mickey McGuire | Baltimore Orioles | Chicago White Sox | Trade |
| Sep 23, 1970 | Trade | Mickey Scott | Chicago White Sox | Baltimore Orioles | Trade |
| Sep 22, 1970 | Released | Bobby Cox | New York Yankees | — | Release |
| Sep 20, 1970 | Released | Jimmie Schaffer | Baltimore Orioles | — | Release |
| Sep 14, 1970 | Trade | Mudcat Grant | Oakland Athletics | Pittsburgh Pirates | Trade |
| Sep 10, 1970 | Trade | Bobby Bolin | Milwaukee Brewers | Boston Red Sox | Trade |
| Sep 9, 1970 | Released | Dave Ricketts | Pittsburgh Pirates | — | Release |
| Sep 9, 1970 | Released | Al Spangler | Chicago Cubs | — | Release |
| Sep 1, 1970 | Signed as free agent | Harvey Kuenn | — | Milwaukee Brewers | Free agent signing |
| Sep 1, 1970 | Trade | Ron Herbel | San Diego Padres | New York Mets | Trade |
| Aug 31, 1970 | Trade | Unnamed | Pittsburgh Pirates | Washington Senators | $ |
| Aug 31, 1970 | Trade | Denny Riddleberger | Pittsburgh Pirates | Washington Senators | Trade |
| Aug 31, 1970 | Trade | George Brunet | Washington Senators | Pittsburgh Pirates | Trade |
| Aug 30, 1970 | Trade | Jim Browning | St. Louis Cardinals | Philadelphia Phillies | Added to trade |
| Aug 26, 1970 | Released | Orlando Peña | Pittsburgh Pirates | — | Release |
| Aug 25, 1970 | Released | Camilo Pascual | Los Angeles Dodgers | — | Release |
| Aug 24, 1970 | Signed | Sergio Ferrer | — | Los Angeles Dodgers | Amateur free agent signing |
| Aug 24, 1970 | Signed | Larry Harlow | — | Baltimore Orioles | Amateur free agent signing |
| Aug 22, 1970 | Signed | Ike Hampton | — | New York Mets | Amateur free agent signing |
| Aug 21, 1970 | Signed | Jerry Royster | — | Los Angeles Dodgers | Amateur free agent signing |
| Aug 19, 1970 | Released | John Roseboro | Washington Senators | — | Release |
| Aug 12, 1970 | Released | Jim Bouton | Houston Astros | — | Release |
| Aug 11, 1970 | Released | Lou Klimchock | Cleveland Indians | — | Release |
| Aug 1, 1970 | Signed | Juan Bernhardt | — | New York Yankees | Amateur free agent signing |
| Jul 25, 1970 | Signed | Jimmy Sexton | — | Pittsburgh Pirates | Amateur free agent signing |
| Jul 20, 1970 | Trade | Mike McCormick | San Francisco Giants | New York Yankees | Trade |
| Jul 20, 1970 | Trade | John Cumberland | New York Yankees | San Francisco Giants | Trade |
| Jul 17, 1970 | Signed | Ron Washington | — | Kansas City Royals | Amateur free agent signing |
| Jul 14, 1970 | Signed | Mario Mendoza | — | Pittsburgh Pirates | Amateur free agent signing |
| Jul 13, 1970 | Released | Jim Davenport | San Francisco Giants | — | Release |
| Jul 9, 1970 | Trade | Archie Reynolds | Chicago Cubs | California Angels | Trade |
| Jul 9, 1970 | Trade | Juan Pizarro | California Angels | Chicago Cubs | Trade |
| Jul 8, 1970 | Released | Bob Johnson | Oakland Athletics | — | Release |
| Jul 7, 1970 | Signed | Steve Grilli | — | Detroit Tigers | Amateur free agent signing |
| Jul 6, 1970 | Released | Hank Aguirre | Chicago Cubs | — | Release |
| Jul 5, 1970 | Signed as free agent | Steve Barber | — | Atlanta Braves | Free agent signing |
| Jul 2, 1970 | Signed | Frank White | — | Kansas City Royals | Amateur free agent signing |
| Jul 1, 1970 | Trade | Ted Abernathy | St. Louis Cardinals | Kansas City Royals | Trade |
| Jul 1, 1970 | Trade | Chris Zachary | Kansas City Royals | St. Louis Cardinals | Trade |
| Jun 30, 1970 | Released | Steve Barber | Chicago Cubs | — | Release |
| Jun 29, 1970 | Signed as free agent | Al Spangler | — | Chicago Cubs | Free agent signing |
| Jun 27, 1970 | Signed | Craig Kusick | — | Minnesota Twins | Amateur free agent signing |
| Jun 23, 1970 | Trade | Roberto Rodriguez | Oakland Athletics | Chicago Cubs | Trade |
| Jun 23, 1970 | Trade | Don Young | Chicago Cubs | Oakland Athletics | Trade |
| Jun 23, 1970 | Trade | Mike Marshall | Houston Astros | Montreal Expos | Trade |
| Jun 23, 1970 | Trade | Don Bosch | Montreal Expos | Houston Astros | Trade |
| Jun 22, 1970 | Released | Ron Kline | Atlanta Braves | — | Release |
| Jun 22, 1970 | Signed | Bombo Rivera | — | Montreal Expos | Amateur free agent signing |
| Jun 17, 1970 | Signed | Mike Barlow | — | Oakland Athletics | Amateur free agent signing |
| Jun 15, 1970 | Signed as free agent | Bob Humphreys | — | Milwaukee Brewers | Free agent signing |
| Jun 15, 1970 | Trade | Dick Baney | Milwaukee Brewers | Baltimore Orioles | Trade |
| Jun 15, 1970 | Trade | Buzz Stephen | Milwaukee Brewers | Baltimore Orioles | Trade |
| Jun 15, 1970 | Trade | Dave May | Baltimore Orioles | Milwaukee Brewers | Trade |
| Jun 15, 1970 | Trade | Moe Drabowsky | Kansas City Royals | Baltimore Orioles | Trade |
| Jun 15, 1970 | Trade | Bobby Floyd | Baltimore Orioles | Kansas City Royals | Trade |
| Jun 15, 1970 | Trade | Barry Moore | Cleveland Indians | Chicago White Sox | Trade |
| Jun 15, 1970 | Trade | Bob Miller | Cleveland Indians | Chicago White Sox | Trade |
| Jun 15, 1970 | Trade | Buddy Bradford | Chicago White Sox | Cleveland Indians | Trade |
| Jun 15, 1970 | Trade | Tommie Sisk | Chicago White Sox | Cleveland Indians | Trade |
| Jun 15, 1970 | Trade | Ty Cline | Montreal Expos | Cincinnati Reds | Trade |
| Jun 15, 1970 | Trade | Clyde Mashore | Cincinnati Reds | Montreal Expos | Trade |
| Jun 15, 1970 | Trade | John O'Donoghue | Milwaukee Brewers | Montreal Expos | Trade |
| Jun 15, 1970 | Trade | Jose Herrera | Montreal Expos | Milwaukee Brewers | Trade |
| Jun 13, 1970 | Released | Bob Humphreys | Washington Senators | — | Release |
| Jun 13, 1970 | Trade | Jim Beauchamp | Houston Astros | St. Louis Cardinals | Trade |
| Jun 13, 1970 | Trade | Leon McFadden | Houston Astros | St. Louis Cardinals | Trade |
| Jun 13, 1970 | Trade | George Culver | St. Louis Cardinals | Houston Astros | Trade |
| Jun 13, 1970 | Trade | Cookie Rojas | St. Louis Cardinals | Kansas City Royals | Trade |
| Jun 13, 1970 | Trade | Fred Rico | Kansas City Royals | St. Louis Cardinals | Trade |
| Jun 11, 1970 | Trade | Al Downing | Oakland Athletics | Milwaukee Brewers | Trade |
| Jun 11, 1970 | Trade | Tito Francona | Oakland Athletics | Milwaukee Brewers | Trade |
| Jun 11, 1970 | Trade | Steve Hovley | Milwaukee Brewers | Oakland Athletics | Trade |
| Jun 10, 1970 | Signed | Bill Bonham | — | Chicago Cubs | Amateur free agent signing |
| Jun 9, 1970 | Signed as free agent | Orlando Peña | — | Pittsburgh Pirates | Free agent signing |
| Jun 8, 1970 | Released | Bart Zeller | St. Louis Cardinals | — | Release |
| Jun 6, 1970 | Signed as free agent | Doc Edwards | — | Philadelphia Phillies | Free agent signing |
| May 29, 1970 | Trade | Phil Gagliano | St. Louis Cardinals | Chicago Cubs | Trade |
| May 29, 1970 | Trade | Ted Abernathy | Chicago Cubs | St. Louis Cardinals | Trade |
| May 28, 1970 | Trade | Mike Fiore | Kansas City Royals | Boston Red Sox | Trade |
| May 28, 1970 | Trade | Tommy Matchick | Boston Red Sox | Kansas City Royals | Trade |
| May 27, 1970 | Signed | Arturo DeFreites | — | Cincinnati Reds | Amateur free agent signing |
| May 26, 1970 | Trade | Bobby Pfeil | New York Mets | Philadelphia Phillies | Trade |
| May 22, 1970 | Trade | Fred Lasher | Detroit Tigers | Cleveland Indians | Trade |
| May 22, 1970 | Trade | Russ Nagelson | Cleveland Indians | Detroit Tigers | Trade |
| May 22, 1970 | Trade | Billy Rohr | Cleveland Indians | Detroit Tigers | Trade |
| May 20, 1970 | Signed as free agent | Jay Ritchie | — | Boston Red Sox | Free agent signing (date approximate, per the source) |
| May 19, 1970 | Trade | Frank Linzy | San Francisco Giants | St. Louis Cardinals | Trade |
| May 19, 1970 | Trade | Jerry Johnson | St. Louis Cardinals | San Francisco Giants | Trade |
| May 18, 1970 | Released | Al McBean | Pittsburgh Pirates | — | Release |
| May 18, 1970 | Trade | Roberto Peña | Oakland Athletics | Milwaukee Brewers | Trade |
| May 18, 1970 | Trade | John Donaldson | Milwaukee Brewers | Oakland Athletics | Trade |
| May 16, 1970 | Trade | Terry Dailey | New York Mets | Montreal Expos | Trade |
| May 15, 1970 | Released | Juan Pizarro | Oakland Athletics | — | Release |
| May 15, 1970 | Signed as free agent | Juan Pizarro | — | California Angels | Free agent signing |
| May 15, 1970 | Trade | Gary Waslewski | Montreal Expos | New York Yankees | Trade |
| May 15, 1970 | Trade | Dave McDonald | New York Yankees | Montreal Expos | Trade |
| May 14, 1970 | Released | Jay Ritchie | Atlanta Braves | — | Release |
| May 13, 1970 | Released | Rich Rollins | Milwaukee Brewers | — | Release |
| May 13, 1970 | Signed as free agent | Rich Rollins | — | Cleveland Indians | Free agent signing |
| May 12, 1970 | Released | Jerry Adair | Kansas City Royals | — | Release |
| May 12, 1970 | Trade | Jack Hiatt | Montreal Expos | Chicago Cubs | Trade |
| May 12, 1970 | Trade | Boots Day | Chicago Cubs | Montreal Expos | Trade |
| May 11, 1970 | Trade | Hank Allen | Washington Senators | Milwaukee Brewers | Trade |
| May 11, 1970 | Trade | Ron Theobald | Washington Senators | Milwaukee Brewers | Trade |
| May 11, 1970 | Trade | Wayne Comer | Milwaukee Brewers | Washington Senators | Trade |
| May 6, 1970 | Released | Turk Farrell | Atlanta Braves | — | Release |
| May 5, 1970 | Released | Tony Pierce | Oakland Athletics | — | Release |
| May 5, 1970 | Trade | Bill Dillman | St. Louis Cardinals | Montreal Expos | Trade (date approximate, per the source) |
| May 5, 1970 | Trade | Carroll Sembera | Montreal Expos | St. Louis Cardinals | Trade (date approximate, per the source) |
| May 4, 1970 | Trade | Jerry Crider | Minnesota Twins | Chicago White Sox | Trade |
| May 1, 1970 | Signed as free agent | Tom Kelley | — | Atlanta Braves | Free agent signing |
| Apr 30, 1970 | Signed as free agent | Ron Kline | — | Atlanta Braves | Free agent signing |
| Apr 28, 1970 | Released | Ken Johnson | Montreal Expos | — | Release |
| Apr 27, 1970 | Released | Pedro Ramos | Washington Senators | — | Release |
| Apr 27, 1970 | Trade | Ken McMullen | Washington Senators | California Angels | Trade |
| Apr 27, 1970 | Trade | Aurelio Rodriguez | California Angels | Washington Senators | Trade |
| Apr 27, 1970 | Trade | Rick Reichardt | California Angels | Washington Senators | Trade |
| Apr 24, 1970 | Released | Al McBean | Los Angeles Dodgers | — | Release |
| Apr 24, 1970 | Signed as free agent | Al McBean | — | Pittsburgh Pirates | Free agent signing |
| Apr 23, 1970 | Signed as free agent | Steve Barber | — | Chicago Cubs | Free agent signing |
| Apr 22, 1970 | Trade | Jim Qualls | Chicago Cubs | Montreal Expos | Trade |
| Apr 22, 1970 | Trade | Garry Jestadt | Montreal Expos | Chicago Cubs | Trade |
| Apr 20, 1970 | Signed as free agent | Turk Farrell | — | Atlanta Braves | Free agent signing |
| Apr 15, 1970 | Released | Fernando Gonzalez | Milwaukee Brewers | — | Release |
| Apr 13, 1970 | Signed as free agent | Ruben Amaro | — | Philadelphia Phillies | Free agent signing |
| Apr 13, 1970 | Released | Al Jackson | Cincinnati Reds | — | Release |
| Apr 13, 1970 | Released | Camilo Pascual | Cincinnati Reds | — | Release |
| Apr 13, 1970 | Signed as free agent | Camilo Pascual | — | Los Angeles Dodgers | Free agent signing |
| Apr 12, 1970 | Released | Jesus Hernaiz | Chicago Cubs | — | Release |
| Apr 10, 1970 | Trade | Ron Allen | Philadelphia Phillies | New York Mets | Trade |
| Apr 8, 1970 | Released | Ken Johnson | Chicago Cubs | — | Release |
| Apr 8, 1970 | Signed as free agent | Ken Johnson | — | Montreal Expos | Free agent signing |
| Apr 8, 1970 | Released | Tom Tresh | Detroit Tigers | — | Release |
| Apr 8, 1970 | Trade | Willie Montanez | St. Louis Cardinals | Philadelphia Phillies | Added to trade |
| Apr 7, 1970 | Released | Jack Fisher | California Angels | — | Release |
| Apr 7, 1970 | Released | Larry Milbourne | Baltimore Orioles | — | Release |
| Apr 6, 1970 | Released | Darrell Brandon | Minnesota Twins | — | Release |
| Apr 6, 1970 | Signed as free agent | Darrell Brandon | — | Chicago White Sox | Free agent signing |
| Apr 6, 1970 | Released | Chuck Cottier | California Angels | — | Release |
| Apr 6, 1970 | Released | Orlando Peña | Kansas City Royals | — | Release |
| Apr 6, 1970 | Released | Zoilo Versalles | Washington Senators | — | Release |
| Apr 5, 1970 | Released | Jack Baldschun | San Diego Padres | — | Release |
| Apr 4, 1970 | Trade | Unnamed | Milwaukee Brewers | Cleveland Indians | $ |
| Apr 4, 1970 | Trade | Roy Foster | Milwaukee Brewers | Cleveland Indians | Trade |
| Apr 4, 1970 | Trade | Frank Coggins | Milwaukee Brewers | Cleveland Indians | Trade |
| Apr 4, 1970 | Trade | Max Alvis | Cleveland Indians | Milwaukee Brewers | Trade |
| Apr 4, 1970 | Trade | Russ Snyder | Cleveland Indians | Milwaukee Brewers | Trade |
| Apr 2, 1970 | Signed as free agent | Fred Whitfield | — | Montreal Expos | Free agent signing |
| Apr 2, 1970 | Trade | Billy McCool | San Diego Padres | St. Louis Cardinals | Trade |
| Apr 2, 1970 | Trade | Steve Huntz | St. Louis Cardinals | San Diego Padres | Trade |
| Apr 1, 1970 | Released | Steve Barber | Milwaukee Brewers | — | Release |
| Mar 31, 1970 | Released | Ramon Hernandez | St. Louis Cardinals | — | Release |
| Mar 30, 1970 | Signed as free agent | Pedro Ramos | — | Washington Senators | Free agent signing |
| Mar 30, 1970 | Trade | Tommie Sisk | San Diego Padres | Chicago White Sox | Trade |
| Mar 30, 1970 | Trade | Jerry Nyman | Chicago White Sox | San Diego Padres | Trade |
| Mar 29, 1970 | Trade | Randy Bobb | Chicago Cubs | New York Mets | Trade |
| Mar 29, 1970 | Trade | J. C. Martin | New York Mets | Chicago Cubs | Trade |
| Mar 24, 1970 | Released | Al Spangler | Chicago Cubs | — | Release |
| Mar 24, 1970 | Trade | Ramon Webster | Oakland Athletics | San Diego Padres | Trade |
| Mar 24, 1970 | Trade | Roberto Peña | San Diego Padres | Oakland Athletics | Trade |
| Mar 21, 1970 | Trade | Joe Grzenda | Minnesota Twins | Washington Senators | Trade |
| Mar 21, 1970 | Trade | Charlie Walters | Minnesota Twins | Washington Senators | Trade |
| Mar 21, 1970 | Trade | Brant Alyea | Washington Senators | Minnesota Twins | Trade |
| Mar 9, 1970 | Trade | Gerry Janeski | Boston Red Sox | Chicago White Sox | Added to trade |
| Feb 21, 1970 | Signed as free agent | Ed Figueroa | — | San Francisco Giants | Free agent signing |
| Feb 18, 1970 | Trade | Jay Ward | Cleveland Indians | Cincinnati Reds | Trade |
| Feb 18, 1970 | Trade | Steve Mingori | Cincinnati Reds | Cleveland Indians | Trade |
| Feb 4, 1970 | Trade | Bo Belinsky | Pittsburgh Pirates | Cincinnati Reds | Trade |
| Feb 4, 1970 | Trade | Dennis Ribant | Cincinnati Reds | Pittsburgh Pirates | Trade |
| Jan 28, 1970 | Trade | Del Bates | Pittsburgh Pirates | Philadelphia Phillies | Trade |
| Jan 28, 1970 | Trade | Michael Everett | Philadelphia Phillies | Pittsburgh Pirates | Trade |
| Jan 28, 1970 | Trade | Dave Bennett | Philadelphia Phillies | Pittsburgh Pirates | Trade |
| Jan 22, 1970 | Signed | Hector Cruz | — | St. Louis Cardinals | Amateur free agent signing |
| Jan 15, 1970 | Trade | Don Mincher | Milwaukee Brewers | Oakland Athletics | Trade |
| Jan 15, 1970 | Trade | Ron Clark | Milwaukee Brewers | Oakland Athletics | Trade |
| Jan 15, 1970 | Trade | Phil Roof | Oakland Athletics | Milwaukee Brewers | Trade |
| Jan 15, 1970 | Trade | Mike Hershberger | Oakland Athletics | Milwaukee Brewers | Trade |
| Jan 15, 1970 | Trade | Lew Krausse | Oakland Athletics | Milwaukee Brewers | Trade |
| Jan 15, 1970 | Trade | Ken Sanders | Oakland Athletics | Milwaukee Brewers | Trade |
| Jan 14, 1970 | Trade | Bill Harrelson | California Angels | Cincinnati Reds | Trade |
| Jan 14, 1970 | Trade | Daniel Loomer | California Angels | Cincinnati Reds | Trade |
| Jan 14, 1970 | Trade | Jack Fisher | Cincinnati Reds | California Angels | Trade |
| Jan 6, 1970 | Trade | Rick Bladt | Chicago Cubs | New York Yankees | Trade |
| Jan 1970 | Trade | Larry Colton | Philadelphia Phillies | Chicago Cubs | Trade (date approximate, per the source) |
| before the 1970 season | Signed | Santo Alcala | — | Cincinnati Reds | Amateur free agent signing |
| before the 1970 season | Signed | Orlando Alvarez | — | Los Angeles Dodgers | Amateur free agent signing |
| before the 1970 season | Signed | Dave Coleman | — | Boston Red Sox | Amateur free agent signing |
| before the 1970 season | Signed | Lafayette Currence | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1970 season | Released | Doc Edwards | Philadelphia Phillies | — | Release |
| before the 1970 season | Signed | Greg Harts | — | New York Mets | Amateur free agent signing |
| before the 1970 season | Signed | Don Hopkins | — | Montreal Expos | Amateur free agent signing |
| before the 1970 season | Signed | Tom Johnson | — | Minnesota Twins | Amateur free agent signing |
| before the 1970 season | Released | Tom Kelley | Cleveland Indians | — | Release |
| before the 1970 season | Released | Ron Kline | Boston Red Sox | — | Release |
| before the 1970 season | Signed | Brian Ostrosser | — | New York Mets | Amateur free agent signing |
| before the 1970 season | Signed | Dave Pagan | — | New York Yankees | Amateur free agent signing |
| before the 1970 season | Signed | Jim Sadowski | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1970 season | Signed | Jose Sosa | — | Houston Astros | Amateur free agent signing |
| before the 1970 season | Signed | Tom Spencer | — | Cincinnati Reds | Amateur free agent signing |
| before the 1970 season | Signed | Joe Staton | — | Detroit Tigers | Amateur free agent signing |
| before the 1970 season | Released | Fred Whitfield | Cincinnati Reds | — | Release |
| before the 1970 season | Trade | Bruce Brubaker | Los Angeles Dodgers | Milwaukee Brewers | Trade |
| before the 1970 season | Trade | Jerry Stephenson | Milwaukee Brewers | Los Angeles Dodgers | 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.