| Transactions |
| Date | Team | Player | Type | OthTm | EffDate | When |
| 4/10/1970 | PHI | Gardner,R | Demoted to reserve roster |   |   | Before |
| 4/20/1970 | CIN | Spinks | Demoted to reserve roster |   |   | Before |
| 4/29/1970 | HOU | Sprague | Demoted to reserve roster |   |   | Before |
| 5/8/1970 | SDP | Ivie | Demoted to reserve roster |   |   | Before |
| 5/18/1970 | CIN | Nelson,R | Promoted to active roster |   |   | Before |
| 5/18/1970 | HOU | Sprague | Promoted to active roster |   |   | Before |
| 5/18/1970 | SFG | Borbon | Demoted to reserve roster |   |   | Before |
| 5/18/1970 | SFG | Willoughby | Demoted to reserve roster |   |   | Before |
| 5/22/1970 | HOU | Sprague | Demoted to reserve roster |   |   | Before |
| 5/22/1970 | SDP | Brye | Demoted to reserve roster |   |   | Before |
| 6/1/1970 | CHC | Cooper | Demoted to reserve roster |   |   | Before |
| 6/1/1970 | CHC | Lamont | Demoted to reserve roster |   |   | Before |
| 6/1/1970 | CIN | Ellsworth,D | Demoted to reserve roster |   |   | Before |
| 6/1/1970 | CIN | O'Brien,B | Signed |   |   | Before |
| 6/1/1970 | MON | Hovley,S | Demoted to reserve roster |   |   | Before |
| 6/1/1970 | SFG | Gibbs | Demoted to reserve roster |   |   | Before |
| 6/8/1970 | SDP | Burda,B | Signed |   |   | Before |
| 6/8/1970 | SDP | Cowan | Demoted to reserve roster |   |   | Before |
| 6/8/1970 | SDP | Moeller | Demoted to reserve roster |   |   | Before |
| 6/15/1970 | CIN | Humphreys,B | Signed |   |   | Before |
| 6/15/1970 | CIN | O'Brien,B | Demoted to reserve roster |   |   | Before |
| 6/29/1970 | CIN | Queen | Demoted to reserve roster |   |   | Before |
| 6/29/1970 | CIN | Thompson,M | Signed |   |   | Before |
| 6/29/1970 | PHI | Davalillo | Demoted to reserve roster |   |   | Before |
| 7/3/1970 | SDP | Ferraro | Demoted to reserve roster |   |   | Before |
| 7/6/1970 | PHI | Alvarado | Signed |   |   | Before |
| 7/6/1970 | PHI | Oates | Demoted to reserve roster |   |   | Before |
| 7/6/1970 | STL | Allen,B | Demoted to reserve roster |   |   | Before |
| 7/7/1970 | MON | Boccabella | Traded away | |   | Before |
| 7/16/1970 | ATL | McRae,N | Signed |   |   | Before |
| 7/16/1970 | CHC | Ellsworth,D | Signed |   |   | Before |
| 7/16/1970 | CHC | Smith,B | Signed |   |   | Before |
| 7/16/1970 | CIN | Swanson | Signed |   |   | Before |
| 7/16/1970 | HOU | O'Brien,B | Signed |   |   | Before |
| 7/16/1970 | MON | Compton | Signed |   |   | Before |
| 7/16/1970 | MON | Davison | Released |   |   | Before |
| 7/16/1970 | MON | Davison | Signed |   |   | Before |
| 7/16/1970 | PIT | Breeden,D | Released |   |   | Before |
| 7/16/1970 | PIT | Breeden,D | Released |   |   | Before |
| 7/16/1970 | PIT | Breeden,D | Signed |   |   | Before |
| 7/16/1970 | PIT | Breeden,D | Signed |   |   | Before |
| 7/16/1970 | PIT | Breeden,H | Signed |   |   | Before |
| 7/16/1970 | STL | Auerbach | Signed |   |   | Before |
| 7/16/1970 | STL | Versalles | Signed |   |   | Before |
| 7/19/1970 | CIN | Moore,B | Signed |   |   | Before |
| 7/19/1970 | HOU | Strahler | Signed |   |   | Before |
| 7/19/1970 | PHI | Gibson,R | Signed |   |   | Before |
| 7/19/1970 | PIT | Tischinski | Signed |   |   | Before |
| 7/19/1970 | SFG | Pagan | Signed |   |   | Before |
| 7/22/1970 | ATL | Ballinger | Demoted to reserve roster |   |   | Before |
| 7/22/1970 | CIN | Tompkins | Signed |   |   | Before |
| 7/22/1970 | PHI | Breeden,D | Signed |   |   | Before |
| 7/22/1970 | PHI | Gardner,R | Released |   |   | Before |
| 7/22/1970 | PHI | Gardner,R | Signed |   |   | Before |
| 7/22/1970 | PHI | Gardner,R | Demoted to reserve roster |   |   | Before |
| 7/22/1970 | PHI | Hamilton | Demoted to reserve roster |   |   | Before |
| 7/22/1970 | PHI | Herrmann | Demoted to reserve roster |   |   | Before |
| 7/22/1970 | PHI | Morales,J | Demoted to reserve roster |   |   | Before |
| 7/22/1970 | PHI | Motton | Signed |   |   | Before |
| 7/22/1970 | PIT | Queen | Signed |   |   | Before |
| 7/25/1970 | CIN | Cambria | Signed |   |   | Before |
| 7/25/1970 | MON | Crowley | Demoted to reserve roster |   |   | Before |
| 7/25/1970 | MON | Jorgensen | Demoted to reserve roster |   |   | Before |
| 7/25/1970 | SFG | Hansen | Demoted to reserve roster |   |   | Before |
| 7/28/1970 | CIN | Arnold | Signed |   |   | Before |
| 7/28/1970 | LAD | Didier | Demoted to reserve roster |   |   | Before |
| 7/28/1970 | NYM | Baldwin | Demoted to reserve roster |   |   | Before |
| 7/28/1970 | STL | Humphrey | Signed |   |   | Before |
| 7/28/1970 | STL | Renick | Signed |   |   | Before |
| 7/31/1970 | CHC | Weis | Signed |   |   | Before |
| 7/31/1970 | NYM | Montgomery,M | Demoted to reserve roster |   |   | Before |
| 7/31/1970 | STL | Cruz | Demoted to reserve roster |   |   | Before |
| 8/3/1970 | CHC | Comer,W | Signed |   |   | Before |
| 8/3/1970 | CHC | Lamont | Promoted to active roster |   |   | Before |
| 8/3/1970 | CHC | Weaver | Signed |   |   | Before |
| 8/3/1970 | CIN | Arnold | Demoted to reserve roster |   |   | Before |
| 8/3/1970 | PHI | Davalillo | Promoted to active roster |   |   | Before |
| 8/3/1970 | PHI | Hamilton | Promoted to active roster |   |   | Before |
| 8/3/1970 | PIT | Breeden,H | Demoted to reserve roster |   |   | Before |
| 8/3/1970 | PIT | Fanzone | Signed |   |   | Before |
| 8/3/1970 | SDP | Voss | Demoted to reserve roster |   |   | Before |
| 8/4/1970 | CIN | Luebber | Signed |   |   | Before |
| 8/4/1970 | CIN | Luebber | Demoted to reserve roster |   |   | Before |
| 8/4/1970 | CIN | Thompson,M | Demoted to reserve roster |   |   | Before |
| 8/4/1970 | CIN | Tompkins | Demoted to reserve roster |   |   | Before |
| 8/4/1970 | CIN | Tompkins | Promoted to active roster |   |   | Before |
| 8/4/1970 | SDP | Spiezio | Demoted to reserve roster |   |   | Before |
| 8/5/1970 | CHC | Denehy | Signed |   |   | Before |
| 8/5/1970 | CHC | Lamont | Demoted to reserve roster |   |   | Before |
| 8/5/1970 | SFG | Robles | Signed |   |   | Before |
| 8/7/1970 | SDP | Baker,FJr | Signed |   |   | Before |
| 8/7/1970 | SDP | Paciorek | Demoted to reserve roster |   |   | Before |
| 8/8/1970 | MON | Gogolewski | Demoted to reserve roster |   |   | Before |
| 8/8/1970 | SDP | Beauchamp | Signed |   |   | Before |
| 8/8/1970 | SDP | Spriggs | Signed |   |   | Before |
| 8/8/1970 | SDP | Valdespino | Signed |   |   | Before |
| 8/10/1970 | MON | Allen,H | Signed |   |   | Before |
| 8/10/1970 | MON | Price | Demoted to reserve roster |   |   | Before |
| 8/10/1970 | PHI | Davalillo | Demoted to reserve roster |   |   | Before |
| 8/11/1970 | MON | Mashore | Signed |   |   | Before |
| 8/12/1970 | LAD | Briggs | Demoted to reserve roster |   |   | Before |
| 8/12/1970 | MON | Richard,L | Demoted to reserve roster |   |   | Before |
| 8/12/1970 | PHI | Bravo | Signed |   |   | Before |
| 8/13/1970 | HOU | Sudakis | Demoted to reserve roster |   |   | Before |
| 8/15/1970 | LAD | Harrelson,K | Demoted to reserve roster |   |   | Before |
| 8/15/1970 | LAD | Harrelson,K | Promoted to active roster |   |   | Before |
| 8/15/1970 | LAD | Ward,P | Demoted to reserve roster |   |   | Before |
| 8/17/1970 | CHC | Banks | Demoted to reserve roster |   |   | Before |
| 8/17/1970 | CIN | Aaron,T | Signed |   |   | Before |
| 8/17/1970 | CIN | Swanson | Demoted to reserve roster |   |   | Before |
| 8/18/1970 | ATL | Lamb,J | Demoted to reserve roster |   |   | Before |
| 8/18/1970 | CIN | Aaron,T | Signed |   |   | Before |
| 8/18/1970 | CIN | Swanson | Demoted to reserve roster |   |   | Before |
| 8/18/1970 | MON | Chiles | Demoted to reserve roster |   |   | Before |
| 8/18/1970 | MON | Nelson,J | Demoted to reserve roster |   |   | Before |
| 8/18/1970 | NYM | Briles | Demoted to reserve roster |   |   | Before |
| 8/19/1970 | NYM | Robertson,B | Demoted to reserve roster |   |   | Before |
| 8/19/1970 | SDP | Hilgendorf | Demoted to reserve roster |   |   | Before |
| 8/20/1970 | MON | Thompson | Signed |   |   | Before |
| 8/24/1970 | CHC | Banks | Promoted to active roster |   |   | Before |
| 8/24/1970 | CHC | Cooper | Promoted to active roster |   |   | Before |
| 8/24/1970 | CIN | Swanson | Released |   |   | Before |
| 8/24/1970 | PHI | Baylor | Demoted to reserve roster |   |   | Before |
| 8/24/1970 | PHI | Davalillo | Promoted to active roster |   |   | Before |
| 8/24/1970 | PHI | Herrmann | Promoted to active roster |   |   | Before |
| 8/24/1970 | PHI | Reynolds,B | Demoted to reserve roster |   |   | Before |
| 8/26/1970 | MON | Morehead | Demoted to reserve roster |   |   | Before |
| 8/27/1970 | NYM | Acosta | Demoted to reserve roster |   |   | Before |
| 8/28/1970 | CIN | Fahey | Signed |   |   | Before |
| 8/28/1970 | CIN | Fahey | Demoted to reserve roster |   |   | Before |
| 8/28/1970 | CIN | Tompkins | Demoted to reserve roster |   |   | Before |
| 8/28/1970 | PHI | Davalillo | Demoted to reserve roster |   |   | Before |
| 8/31/1970 | SDP | Stone,S | Demoted to reserve roster |   |   | Before |
| 8/31/1970 | STL | Ryan,N | Demoted to reserve roster |   |   | Before |
| 9/2/1970 | MON | Hershberger | Demoted to reserve roster |   |   | Before |
| 9/2/1970 | MON | Jones,M | Demoted to reserve roster |   |   | Before |
| 9/2/1970 | SFG | Brown,I | Demoted to reserve roster |   |   | Before |
| 9/3/1970 | SDP | Matlack | Demoted to reserve roster |   |   | Before |
| 9/4/1970 | SDP | Decker | Demoted to reserve roster |   |   | Before |
| 9/7/1970 | CIN | Hall,D | Demoted to reserve roster |   |   | Before |
| 9/7/1970 | CIN | Hosley | Signed |   |   | Before |
| 9/7/1970 | CIN | Spinks | Promoted to active roster |   |   | Before |
| 9/7/1970 | MON | Tompkins | Signed |   |   | Before |
| 9/7/1970 | PHI | Davalillo | Promoted to active roster |   |   | Before |
| 9/7/1970 | SDP | Shellenback | Demoted to reserve roster |   |   | Before |
| 9/8/1970 | SDP | Garber | Demoted to reserve roster |   |   | Before |
| 9/8/1970 | SDP | Hassler | Demoted to reserve roster |   |   | Before |
| 9/8/1970 | SDP | Morris | Demoted to reserve roster |   |   | Before |
| 9/9/1970 | NYM | Bell | Demoted to reserve roster |   |   | Before |
| 9/9/1970 | SDP | Murphy,D | Signed |   |   | Before |
| 9/9/1970 | SDP | Patterson | Signed |   |   | Before |
| 9/9/1970 | STL | Tillman | Demoted to reserve roster |   |   | Before |
| 9/10/1970 | MON | Colbert,V | Demoted to reserve roster |   |   | Before |
| 9/10/1970 | SDP | Billings | Demoted to reserve roster |   |   | Before |
| 9/14/1970 | ATL | Hutto | Signed |   |   | Before |
| 9/14/1970 | NYM | Odom | Demoted to reserve roster |   |   | Before |
| 9/14/1970 | SDP | Folkers | Demoted to reserve roster |   |   | Before |
| 9/14/1970 | SDP | Strohmayer | Demoted to reserve roster |   |   | Before |
| 9/14/1970 | SDP | Washburn | Signed |   |   | Before |
| 9/14/1970 | STL | Thomas,D | Demoted to reserve roster |   |   | Before |
| 9/16/1970 | ATL | Richard,JR | Demoted to reserve roster |   |   | Before |
| 9/16/1970 | CHC | Cooper | Demoted to reserve roster |   |   | Before |
| 9/16/1970 | PHI | Herrmann | Demoted to reserve roster |   |   | Before |
| 9/16/1970 | SDP | Valdespino | Demoted to reserve roster |   |   | Before |
| 9/17/1970 | MON | Campisi | Demoted to reserve roster |   |   | Before |
| 9/17/1970 | PHI | Johnstone | Demoted to reserve roster |   |   | Before |
| 9/17/1970 | STL | Sadecki | Demoted to reserve roster |   |   | Before |
| 9/18/1970 | LAD | Grimsley | Demoted to reserve roster |   |   | Before |
| 9/18/1970 | LAD | Mikkelsen | Demoted to reserve roster |   |   | Before |
| 9/19/1970 | HOU | Slaton | Demoted to reserve roster |   |   | Before |
| 9/21/1970 | CHC | Moses | Demoted to reserve roster |   |   | Before |
| 9/21/1970 | HOU | Jones,C | Demoted to reserve roster |   |   | Before |
| 9/21/1970 | MON | Morales,R | Demoted to reserve roster |   |   | Before |
| 9/21/1970 | PHI | Gibson,R | Demoted to reserve roster |   |   | Before |
| 9/21/1970 | PHI | Motton | Demoted to reserve roster |   |   | Before |
| 9/21/1970 | SDP | Hough | Demoted to reserve roster |   |   | Before |
| 9/23/1970 | LAD | Marshall,D | Demoted to reserve roster |   |   | Before |
| 9/23/1970 | PHI | Herrmann | Promoted to active roster |   |   | Before |
| 9/23/1970 | PHI | Johnstone | Promoted to active roster |   |   | Before |
| 9/23/1970 | PHI | Morales,J | Promoted to active roster |   |   | Before |
| 9/24/1970 | CHC | Dalrymple | Demoted to reserve roster |   |   | Before |
| 9/24/1970 | MON | Fairey | Demoted to reserve roster |   |   | Before |
| 9/24/1970 | PHI | Herrmann | Demoted to reserve roster |   |   | Before |
| 9/24/1970 | PIT | Clemente | Demoted to reserve roster |   |   | Before |
| 9/25/1970 | CHC | Hiatt | Demoted to reserve roster |   |   | Before |
| 9/26/1970 | ATL | Duncan | Demoted to reserve roster |   |   | Before |
| 9/26/1970 | CHC | Gelnar | Demoted to reserve roster |   |   | Before |
| 9/26/1970 | LAD | Ryan,M | Demoted to reserve roster |   |   | Before |
| 9/26/1970 | STL | Day | Demoted to reserve roster |   |   | Before |
| 9/28/1970 | ATL | Brand | Demoted to reserve roster |   |   | Before |
| 9/28/1970 | CHC | Giusti | Demoted to reserve roster |   |   | Before |
| 9/28/1970 | HOU | Pepitone | Demoted to reserve roster |   |   | Before |
| 9/28/1970 | PHI | Davalillo | Demoted to reserve roster |   |   | Before |
| 9/28/1970 | PHI | Johnstone | Demoted to reserve roster |   |   | Before |
| 9/29/1970 | CHC | Francona,T | Demoted to reserve roster |   |   | Before |
| 9/30/1970 | ATL | Newman | Demoted to reserve roster |   |   | Before |
| 9/30/1970 | CHC | Grabarkewitz | Demoted to reserve roster |   |   | Before |
| 9/30/1970 | CIN | Nelson,R | Demoted to reserve roster |   |   | Before |
| 9/30/1970 | LAD | Santorini | Demoted to reserve roster |   |   | Before |
| 9/30/1970 | LAD | Webster | Demoted to reserve roster |   |   | Before |
| 10/1/1970 | ATL | Ballinger | Promoted to active roster |   |   | Before |
| 10/1/1970 | ATL | Brand | Promoted to active roster |   |   | Before |
| 10/1/1970 | ATL | Duncan | Promoted to active roster |   |   | Before |
| 10/1/1970 | ATL | Lamb,J | Promoted to active roster |   |   | Before |
| 10/1/1970 | ATL | Newman | Promoted to active roster |   |   | Before |
| 10/1/1970 | ATL | Richard,JR | Promoted to active roster |   |   | Before |
| 10/1/1970 | LAD | Butler | Demoted to reserve roster |   |   | Before |
| 10/1/1970 | MON | Kosco | Demoted to reserve roster |   |   | Before |
| 10/1/1970 | PHI | Baylor | Promoted to active roster |   |   | Before |
| 10/1/1970 | PHI | Davalillo | Promoted to active roster |   |   | Before |
| 10/1/1970 | PHI | Gibson,R | Promoted to active roster |   |   | Before |
| 10/1/1970 | PHI | Herrmann | Promoted to active roster |   |   | Before |
| 10/1/1970 | PHI | Johnstone | Promoted to active roster |   |   | Before |
| 10/1/1970 | PHI | Motton | Promoted to active roster |   |   | Before |
| 10/1/1970 | PHI | Oates | Promoted to active roster |   |   | Before |
| 10/1/1970 | SDP | Scherman | Demoted to reserve roster |   |   | Before |
| 10/3/1970 | LAD | Briggs | Promoted to active roster |   |   | Before |
| 10/3/1970 | LAD | Butler | Promoted to active roster |   |   | Before |
| 10/3/1970 | LAD | Didier | Promoted to active roster |   |   | Before |
| 10/3/1970 | LAD | Grimsley | Promoted to active roster |   |   | Before |
| 10/3/1970 | LAD | Marshall,D | Promoted to active roster |   |   | Before |
| 10/3/1970 | LAD | Mikkelsen | Promoted to active roster |   |   | Before |
| 10/3/1970 | LAD | Ryan,M | Promoted to active roster |   |   | Before |
| 10/3/1970 | LAD | Santorini | Promoted to active roster |   |   | Before |
| 10/3/1970 | LAD | Ward,P | Promoted to active roster |   |   | Before |
| 10/3/1970 | LAD | Webster | Promoted to active roster |   |   | Before |
| 10/3/1970 | PHI | Baylor | Demoted to reserve roster |   |   | Before |
| 10/3/1970 | PHI | Baylor | Promoted to active roster |   |   | Before |
| 10/3/1970 | PHI | Breeden,D | Demoted to reserve roster |   |   | Before |
| 10/3/1970 | PHI | Greif | Demoted to reserve roster |   |   | Before |
| 10/3/1970 | PHI | Oates | Demoted to reserve roster |   |   | Before |
| 10/3/1970 | PHI | Parker,H | Demoted to reserve roster |   |   | Before |
| 10/3/1970 | PHI | Wilcox | Demoted to reserve roster |   |   | Before |
| 10/3/1970 | PHI | Woodson | Demoted to reserve roster |   |   | Before |
| 10/4/1970 | PHI | Grant,J | Demoted to reserve roster |   |   | Before |
| 10/6/1970 | ATL | McRae,N | Demoted to reserve roster |   |   | Before |
| 10/15/1970 | ATL | Rader,Da | Demoted to reserve roster |   |   | Before |