| Monday, July 31st, 1978 | Activated SS Mark Conner from the disabled list. | Sunday, July 16th, 1978 | Placed SS Mark Conner on the 15-day disabled list. | Sunday, July 9th, 1978 | Activated 2B William Smith from the disabled list. | Thursday, June 15th, 1978 | Drafted MR Larry Coney in the 1978 first-year player draft (Round 6, Pick 20, 125th overall pick). | Drafted 1B Errol Moore in the 1978 first-year player draft (Round 7, Pick 20, 145th overall pick). | Drafted MR Vincente Ochoa in the 1978 first-year player draft (Round 8, Pick 20, 165th overall pick). | Drafted CF Mike Hollis in the 1978 first-year player draft (Round 9, Pick 20, 185th overall pick). | Drafted CL Gregory Wood in the 1978 first-year player draft (Round 10, Pick 20, 205th overall pick). | Promoted 3B Bernardo Sandoval to Double A Laredo. | Received C Holden O'Bryan from Double A Laredo. | Monday, June 5th, 1978 | Activated RF Oscar House from the disabled list. | Tuesday, May 30th, 1978 | Placed 2B William Smith on the 15-day disabled list. | Sunday, April 30th, 1978 | Placed RF Oscar House on the 15-day disabled list. | Thursday, April 20th, 1978 | Placed 3B Brenton Griffin on the 15-day disabled list. | Sunday, December 4th, 1977 | Activated C Enrico Burgos from the disabled list. | Activated CF Júlio Mora from the disabled list. | Thursday, November 17th, 1977 | Activated SP Mario Parra from the disabled list. | |
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