| Monday, September 30th, 1957 | Activated CF George Bissett from the disabled list. | Sunday, September 29th, 1957 | Activated MR Félix Escobedo from the disabled list. | Friday, September 20th, 1957 | Placed CF Charlie Reid on the 15-day disabled list. | Sunday, September 15th, 1957 | Placed CF George Bissett on the 15-day disabled list. | Saturday, September 14th, 1957 | Placed MR Félix Escobedo on the 15-day disabled list. | Tuesday, August 13th, 1957 | Signed Pat Gallagher to a minor league contract with a signing bonus of $5,600. | Placed CF Jorge Castillo on waivers. | Saturday, August 10th, 1957 | Signed 1st round draft pick Juan Velásquez for a signing bonus of $122,600 and a 2-year major league contract worth a total of $245,200. | Friday, August 9th, 1957 | Signed Stephen Dearman to a minor league contract with a signing bonus of $25,100. | Signed Scott Osborne to a minor league contract with a signing bonus of $3,600. | Wednesday, August 7th, 1957 | Signed Bob Hale to a minor league contract with a signing bonus of $11,400. | Tuesday, May 28th, 1957 | Purchased the contract of 2B Teuk-chin Ch'oe from Triple A Thornhill. | RF Ken Reece was designated for assignment and placed on waivers (from active). | Saturday, April 13th, 1957 | Activated 3B Francisco Mojica from the disabled list. | 2B Gerald Gray was designated for assignment and placed on irrevocable waivers. | Thursday, March 28th, 1957 | Placed 3B Francisco Mojica on the 15-day disabled list. | |
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