| Monday, September 22nd, 1980 | Activated CF Bob Cummins from the disabled list. | Sunday, September 21st, 1980 | Activated SS Will Pitts from the disabled list. | Saturday, September 20th, 1980 | Activated MR Michael Mack from the disabled list. | Friday, September 12th, 1980 | Placed SS Dave Day on the 9-day disabled list. | Thursday, September 4th, 1980 | Placed MR Michael Mack on the 9-day disabled list. | Saturday, August 9th, 1980 | Signed 1st round draft pick Júlio Rodríguez for a signing bonus of $950,100 and a 2-year major league contract worth a total of $1,900,200. | Saturday, August 2nd, 1980 | Placed RF Sandy Pearson on the 60-day disabled list. | Friday, August 1st, 1980 | Signed Ronald Reed to a minor league contract with a signing bonus of $49,800. | Saturday, July 26th, 1980 | Signed Boyd Morris to a minor league contract with a signing bonus of $29,700. | Thursday, July 24th, 1980 | Signed Bill Lloyd to a minor league contract with a signing bonus of $110,900. | Thursday, July 17th, 1980 | Recalled MR Corentin Anne from Triple A Vaughan. | MR Juan Gómez was designated for assignment and placed on waivers (from active). | Thursday, June 26th, 1980 | Signed Cristo Vargas to a minor league contract with a signing bonus of $75,100. | Thursday, June 19th, 1980 | Placed SP In-sin Yang on the 60-day disabled list. | Friday, May 2nd, 1980 | Activated LF Sandy Pearson from the disabled list. | LF Archie Gray was designated for assignment and placed on waivers (from active). | Saturday, April 5th, 1980 | Placed LF Sandy Pearson on the 9-day disabled list. | |
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