Offseason
- October 22, 1979: Craig Kusick was released by the Blue Jays.
- November 1, 1979: Rick Cerone, Tom Underwood and Ted Wilborn were traded by the Blue Jays to the New York Yankees for Chris Chambliss, Dámaso García, and Paul Mirabella.
- December 5, 1979: Chris Chambliss and Luis Gómez were traded by the Blue Jays to the Atlanta Braves for Barry Bonnell, Pat Rockett, and Joey McLaughlin.
- December 10, 1979: Andre Robertson was purchased by the New York Yankees from the Toronto Blue Jays.
- March 29, 1980: Rico Carty was released by the Blue Jays.
- March 29, 1980: Steve Luebber was released by the Blue Jays.
Read more about this topic: 1980 Toronto Blue Jays Season