| Saturday, June 15th, 1957 | Promoted MR Lee Mayfield to Double A Brownsville. | Received SP José Souza from Double A Brownsville. | Drafted C Mike Martin in the 1957 first-year player draft (Round 6, Pick 11, 98th overall pick). | Drafted SP Orlando García in the 1957 first-year player draft (Round 7, Pick 11, 114th overall pick). | Drafted LF Paul Harris in the 1957 first-year player draft (Round 8, Pick 11, 130th overall pick). | Drafted MR Craig Williams in the 1957 first-year player draft (Round 9, Pick 11, 146th overall pick). | Drafted MR William Bishop in the 1957 first-year player draft (Round 10, Pick 11, 162nd overall pick). | Sunday, February 10th, 1957 | Released CF Pat Martin. | Saturday, February 2nd, 1957 | Released CL Raúl Elías. | Sunday, September 23rd, 1956 | Activated CF Gerry Gillorn from the disabled list. | Sunday, September 16th, 1956 | Activated RF Curt MacGruder from the disabled list. | Tuesday, August 28th, 1956 | Released SS Luis Ortíz. | |
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