| Transactions |
| Date | Team | Player | Type | OthTm | EffDate | When | Appl |
| 4/3/1979 | NYA | Beniquez | Placed on Injured List | | | Before | Yes |
| 4/12/1979 | NYA | Beniquez | Activated from Injured List | | | Before | Yes |
| 4/12/1979 | NYA | Blair | Released | | | Before | Yes |
| 4/19/1979 | NYA | Brown | Acquired via trade | Tor | | Before | Yes |
| 4/19/1979 | NYA | Brown | Demoted to reserve roster | | | Before | Yes |
| 4/21/1979 | NYA | Gossage | Placed on Injured List | | 4/21/1979 | Before | Yes |
| 4/22/1979 | NYA | Davis | Promoted to active roster | | | Before | Yes |
| 5/4/1979 | NYA | Beattie | Promoted to active roster | | | Before | No |
| 5/4/1979 | NYA | Davis | Demoted to reserve roster | | | Before | No |
| 5/11/1979 | NYA | Kaat | Acquired via trade | Phi | | Before | No |
| 5/12/1979 | NYA | Mirabella | Demoted to reserve roster | | | Before | No |
| 5/23/1979 | NYA | Burris | Acquired via trade | ChN | | Before | No |
| 5/23/1979 | NYA | Tidrow | Traded away | ChN | | Before | No |
| 5/28/1979 | NYA | Davis | Promoted to active roster | | | Before | No |
| 5/28/1979 | NYA | Doyle | Demoted to reserve roster | | | Before | No |
| 6/3/1979 | NYA | Jackson | Placed on Injured List | | 6/3/1979 | Before | No |
| 6/6/1979 | NYA | Jones | Promoted to active roster | | | Before | No |
| 6/15/1979 | NYA | Hood | Acquired via trade | Cle | | Before | No |
| 6/15/1979 | NYA | Johnson | Traded away | Cle | | Before | No |
| 6/15/1979 | NYA | Johnstone | Traded away | SD | | Before | No |
| 6/20/1979 | NYA | Brown | Promoted to active roster | | | Before | No |
| 6/25/1979 | NYA | Beattie | Placed on Injured List | | 6/25/1979 | Before | No |
| 6/25/1979 | NYA | Figueroa | Placed on Injured List | | 6/25/1979 | Before | No |
| 6/26/1979 | NYA | Brown | Demoted to reserve roster | | | Before | No |
| 6/26/1979 | NYA | Murcer | Acquired via trade | ChN | | Before | No |
| 6/27/1979 | NYA | Jackson | Activated from Injured List | | | Before | No |
| 6/30/1979 | NYA | Doyle | Promoted to active roster | | | Before | No |
| 6/30/1979 | NYA | Rivers | Placed on Injured List | | 6/30/1979 | Before | No |
| 7/9/1979 | NYA | Beniquez | Placed on Injured List | | 7/9/1979 | Before | No |
| 7/9/1979 | NYA | Brown | Promoted to active roster | | | Before | No |
| 7/9/1979 | NYA | Gossage | Activated from Injured List | | | Before | No |
| 7/20/1979 | NYA | Jones | Demoted to reserve roster | | | Before | No |
| 7/20/1979 | NYA | Rivers | Activated from Injured List | | | Before | No |
| 7/22/1979 | NYA | Beattie | Activated from Injured List | | | Before | No |
| 7/22/1979 | NYA | Beattie | Demoted to reserve roster | | | Before | No |
| 7/23/1979 | NYA | Brown | Demoted to reserve roster | | | Before | No |
| 7/23/1979 | NYA | Figueroa | Activated from Injured List | | | Before | No |
| 7/30/1979 | NYA | Beniquez | Activated from Injured List | | | Before | No |
| 7/30/1979 | NYA | Rivers | Traded away | Tex | | Before | No |
| 7/31/1979 | NYA | Beniquez | Placed on Injured List | | 7/31/1979 | Before | No |
| 8/2/1979 | NYA | Figueroa | Placed on Injured List | | 8/2/1979 | Before | No |
| 8/2/1979 | NYA | Gamble | Acquired via trade | Tex | | Before | No |
| 8/2/1979 | NYA | Munson | Released | | | Before | No |
| 8/2/1979 | NYA | Randle | Promoted to active roster | | | Before | No |
| 8/3/1979 | NYA | Brown | Promoted to active roster | | | Before | No |
| 8/3/1979 | NYA | Doyle | Demoted to reserve roster | | | Before | No |
| 8/3/1979 | NYA | Gulden | Promoted to active roster | | | Before | No |
| 8/17/1979 | NYA | Beattie | Promoted to active roster | | | Before | No |
| 8/17/1979 | NYA | Burris | Demoted to reserve roster | | | Before | No |
| 8/20/1979 | NYA | Burris | Traded away | NYN | | Before | No |
| 8/27/1979 | NYA | Brown | Demoted to reserve roster | | | Before | No |
| 8/27/1979 | NYA | Scott | Signed | | | Before | No |
| 9/1/1979 | NYA | Beniquez | Activated from Injured List | | | Before | No |
| 9/1/1979 | NYA | Brown | Promoted to active roster | | | Before | No |
| 9/1/1979 | NYA | Doyle | Promoted to active roster | | | Before | No |
| 9/1/1979 | NYA | Garcia | Promoted to active roster | | | Before | No |
| 9/1/1979 | NYA | Griffin | Promoted to active roster | | | Before | No |
| 9/1/1979 | NYA | Jones | Promoted to active roster | | | Before | No |
| 9/1/1979 | NYA | Mirabella | Promoted to active roster | | | Before | No |
| 9/1/1979 | NYA | Slagle | Promoted to active roster | | | Before | No |
| 9/1/1979 | NYA | Staiger | Promoted to active roster | | | Before | No |
| 9/16/1979 | NYA | Anderson | Promoted to active roster | | | Before | No |
| 9/16/1979 | NYA | Jones | Demoted to reserve roster | | | Before | No |
| 9/16/1979 | NYA | Kammeyer | Promoted to active roster | | | Before | No |
| 9/16/1979 | NYA | Randle | Demoted to reserve roster | | | Before | No |
| 9/16/1979 | NYA | Righetti | Promoted to active roster | | | Before | No |
| 9/16/1979 | NYA | Robinson | Promoted to active roster | | | Before | No |
| 9/16/1979 | NYA | Slagle | Demoted to reserve roster | | | Before | No |
| 9/16/1979 | NYA | Werth | Promoted to active roster | | | Before | No |