| Sunday, August 11th, 1957 | Signed Kenny Hill to a minor league contract with a signing bonus of $2,600. | Saturday, August 10th, 1957 | Signed Sergio López to a minor league contract with a signing bonus of $20,300. | Thursday, August 8th, 1957 | Signed Álex Durón to a minor league contract with a signing bonus of $5,600. | Signed Lorenzo Peña to a minor league contract with a signing bonus of $3,300. | Tuesday, July 30th, 1957 | Signed Isaac Ward to a minor league contract with a signing bonus of $19,100. | Thursday, June 27th, 1957 | Purchased the contract of CF David Garza from Triple A Pickering. | RF Tom O'Keefe was designated for assignment and placed on irrevocable waivers. | Sunday, June 9th, 1957 | Placed SP Raúl Trujillo on the 60-day disabled list. | Wednesday, May 8th, 1957 | Activated CF Sergio Salas from the disabled list. | RF Hugh O'Hagarty was designated for assignment and placed on irrevocable waivers. | Saturday, March 30th, 1957 | Placed MR Scott Gordon on the 60-day disabled list. | Tuesday, November 6th, 1956 | Activated 3B Jim Clothier from the disabled list. | SS Jesús Hinojosa was designated for assignment and placed on irrevocable waivers. | |
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