| Sunday, August 24th, 1980 | Activated LF Dorian Bach from the disabled list. | Activated LF Ji-chol Kim from the disabled list. | Saturday, August 9th, 1980 | Placed LF Ji-chol Kim on the 15-day disabled list. | Saturday, July 26th, 1980 | Activated MR Donald Hicks from the disabled list. | Wednesday, July 16th, 1980 | Activated CF Ji-chol Kim from the disabled list. | Sunday, July 6th, 1980 | Activated RF Alonso Reyes from the disabled list. | Sunday, June 15th, 1980 | Drafted SP Orlando Gutiérrez in the 1980 first-year player draft (Round 6, Pick 9, 113rd overall pick). | Drafted C Brock Parker in the 1980 first-year player draft (Round 7, Pick 9, 134th overall pick). | Drafted CF Dorian Bach in the 1980 first-year player draft (Round 8, Pick 9, 154th overall pick). | Drafted C Dave Knapp in the 1980 first-year player draft (Round 9, Pick 9, 174th overall pick). | Drafted SP Doug Hughes in the 1980 first-year player draft (Round 10, Pick 9, 194th overall pick). | Tuesday, June 10th, 1980 | Activated RF Adrian Lang from the disabled list. | Wednesday, June 4th, 1980 | Placed RF Alonso Reyes on the 15-day disabled list. | Friday, May 16th, 1980 | Placed RF Adrian Lang on the 15-day disabled list. | Sunday, May 11th, 1980 | Activated LF Domingo Arreola from the disabled list. | Tuesday, April 15th, 1980 | Placed LF Domingo Arreola on the 15-day disabled list. | Saturday, October 6th, 1979 | Activated CL Jimmy Heyer from the disabled list. | Thursday, October 4th, 1979 | Signed pitching coach Qi-zhen Mo. | |
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