| Transactions |
| Date | Team | Player | Type | OthTm | EffDate | When | Appl |
| 4/21/1979 | Hou | Dixon | Placed on Injured List | | 4/21/1979 | Before | Yes |
| 4/22/1979 | Hou | Williams | Promoted to active roster | | | Before | Yes |
| 5/12/1979 | Hou | Dixon | Activated from Injured List | | | Before | No |
| 5/12/1979 | Hou | Wilson | Demoted to reserve roster | | | Before | No |
| 5/14/1979 | Hou | Ruhle | Placed on Injured List | | 5/14/1979 | Before | No |
| 5/17/1979 | Hou | Niemann | Promoted to active roster | | | Before | No |
| 5/23/1979 | Hou | Forsch | Placed on Injured List | | 5/23/1979 | Before | No |
| 5/25/1979 | Hou | McLaughlin | Traded away | Atl | | Before | No |
| 5/25/1979 | Hou | Roberge | Promoted to active roster | | | Before | No |
| 5/25/1979 | Hou | Throop | Promoted to active roster | | | Before | No |
| 6/15/1979 | Hou | Watson | Traded away | Bos | | Before | No |
| 6/18/1979 | Hou | Baldwin | Promoted to active roster | | | Before | No |
| 6/19/1979 | Hou | Sprowl | Acquired via trade | Bos | | Before | No |
| 6/19/1979 | Hou | Sprowl | Demoted to reserve roster | | | Before | No |
| 6/23/1979 | Hou | Riccelli | Placed on Injured List | | 6/23/1979 | Before | No |
| 6/26/1979 | Hou | Forsch | Activated from Injured List | | | Before | No |
| 7/13/1979 | Hou | Dixon | Placed on Injured List | | 7/13/1979 | Before | No |
| 7/17/1979 | Hou | LaCorte | Acquired via trade | Atl | | Before | No |
| 8/12/1979 | Hou | Baldwin | Demoted to reserve roster | | | Before | No |
| 8/12/1979 | Hou | Knicely | Promoted to active roster | | | Before | No |
| 8/16/1979 | Hou | Ladd | Promoted to active roster | | | Before | No |
| 8/16/1979 | Hou | Roberge | Placed on Injured List | | 8/16/1979 | Before | No |
| 8/30/1979 | Hou | Ashby | Placed on Injured List | | 8/30/1979 | Before | No |
| 8/30/1979 | Hou | Heep | Promoted to active roster | | | Before | No |
| 8/30/1979 | Hou | Throop | Demoted to reserve roster | | | Before | No |
| 9/1/1979 | Hou | Baldwin | Promoted to active roster | | | Before | No |
| 9/1/1979 | Hou | Bergman | Promoted to active roster | | | Before | No |
| 9/1/1979 | Hou | Dixon | Activated from Injured List | | | Before | No |
| 9/1/1979 | Hou | Mendoza | Promoted to active roster | | | Before | No |
| 9/1/1979 | Hou | Pladson | Promoted to active roster | | | Before | No |
| 9/1/1979 | Hou | Pujols | Promoted to active roster | | | Before | No |
| 9/1/1979 | Hou | Riccelli | Activated from Injured List | | | Before | No |
| 9/1/1979 | Hou | Ruhle | Activated from Injured List | | | Before | No |
| 9/1/1979 | Hou | Sprowl | Promoted to active roster | | | Before | No |
| 9/1/1979 | Hou | Wiedenbauer | Promoted to active roster | | | Before | No |
| 9/1/1979 | Hou | Wilson | Promoted to active roster | | | Before | No |
| 9/6/1979 | Hou | Roberge | Activated from Injured List | | | Before | No |
| 9/17/1979 | Hou | Ashby | Activated from Injured List | | | Before | No |