| Wednesday, September 17th, 1980 | Placed SP Ed Larsen on the 60-day disabled list. | Thursday, August 14th, 1980 | Failed to sign 5th round draft pick Tim Roberts. | Wednesday, August 13th, 1980 | Signed Dave Hudson to a minor league contract with a signing bonus of $55,600. | Monday, August 11th, 1980 | Signed José Ramírez to a minor league contract with a signing bonus of $21,900. | Sunday, August 10th, 1980 | Signed Bruce Chandler to a minor league contract with a signing bonus of $178,400. | Thursday, August 7th, 1980 | Signed John Hairston to a minor league contract with a signing bonus of $88,000. | Saturday, August 2nd, 1980 | Signed Gerald Coleman to a minor league contract with a signing bonus of $241,600. | Sunday, June 1st, 1980 | Placed SP Luis Miranda on the 60-day disabled list. | Monday, April 7th, 1980 | Activated MR Carlos Ríos from the disabled list. | Saturday, March 29th, 1980 | Placed MR Carlos Ríos on the 9-day disabled list. | Placed LF Manuel Flores on the 9-day disabled list. | Tuesday, October 30th, 1979 | Signed scouting director Lance Robinson to a 3-year, $20,800 per year contract. | Saturday, October 13th, 1979 | Activated SS David Craig from the 60-day disabled list. | 3B Bartolo Zavala was designated for assignment and placed on waivers (from active). | |
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