| Tuesday, August 13th, 1957 | Signed Carlos Rodríguez to a minor league contract with a signing bonus of $10,500. | Monday, August 12th, 1957 | Signed Jesús Sánchez to a minor league contract with a signing bonus of $24,900. | Tuesday, August 6th, 1957 | Signed Thatcher Leonard to a minor league contract with a signing bonus of $2,400. | Thursday, July 18th, 1957 | Signed Arturo Salazar to a minor league contract with a signing bonus of $7,100. | Wednesday, July 17th, 1957 | Placed CF Gary Sampson on the 60-day disabled list. | Thursday, June 13th, 1957 | Activated 2B Aurelio Marrero from the disabled list. | 3B Ronaldo Pagán was designated for assignment and placed on waivers (from active). | Wednesday, June 12th, 1957 | Placed SP Bob Patterson on the 60-day disabled list. | Sunday, May 5th, 1957 | Activated 1B Larry Todd from the disabled list. | SS Ronaldo Pagán was designated for assignment and placed on waivers (from active). | Wednesday, May 1st, 1957 | Purchased the contract of LF Ricardo Palbes from Triple A Brampton. | RF Bruno Cobb was designated for assignment and placed on irrevocable waivers. | Monday, November 12th, 1956 | Activated SP Glenn Loiselle from the 60-day disabled list. | MR David Ward was designated for assignment and placed on irrevocable waivers. | Friday, October 26th, 1956 | Activated CL Victor Buckley from the disabled list. | MR Jason Ayers was designated for assignment and placed on waivers (from active). | |
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