| | | Saturday, August 16th, 1975 | | Activated SS Joe Maynard from the disabled list. |
| Saturday, August 9th, 1975 | | Activated SP Elliott Meadows from the disabled list. |
| Wednesday, July 30th, 1975 | | Activated CL Tomás Marín from the disabled list. |
| Monday, July 28th, 1975 | | Activated MR José Vallés from the disabled list. |
| Monday, July 7th, 1975 | | Activated CF Bob Cummins from the disabled list. |
| Thursday, June 19th, 1975 | | Placed CF Bob Cummins on the 15-day disabled list. |
| Sunday, June 15th, 1975 | | Drafted 3B Robby Wright in the 1975 first-year player draft (Round 6, Pick 10, 116th overall pick). | | Drafted SP Pedro Vázquez in the 1975 first-year player draft (Round 7, Pick 10, 137th overall pick). | | Drafted C António Castillo in the 1975 first-year player draft (Round 8, Pick 10, 157th overall pick). | | Drafted SP Steven Slagle in the 1975 first-year player draft (Round 9, Pick 10, 177th overall pick). | | Drafted 1B Domingo Marín in the 1975 first-year player draft (Round 10, Pick 10, 197th overall pick). | | Promoted SP Edward Brennan to Double A San Antonio. | | Received SP Jason Clarke from Double A San Antonio. |
| Thursday, May 29th, 1975 | | Activated SP Edward Brennan from the disabled list. |
| Saturday, May 17th, 1975 | | Activated CF Bob Cummins from the disabled list. |
| Tuesday, May 13th, 1975 | | Activated 2B Lester O'Brien from the disabled list. |
| Friday, May 2nd, 1975 | | Placed MR José Vallés on the 15-day disabled list. | | Placed CF Bob Cummins on the 15-day disabled list. |
| Monday, April 28th, 1975 | | Placed 2B Lester O'Brien on the 15-day disabled list. |
| Friday, April 25th, 1975 | | Placed SP Edward Brennan on the 15-day disabled list. |
| Sunday, March 23rd, 1975 | | Activated SP Elliott Meadows from the disabled list. |
| Monday, September 30th, 1974 | | 1B Jason Tucker becomes a free-agent. |
|
|
