The 1979 Toronto Blue Jays season was the franchise's third season of Major League Baseball. It resulted in the Blue Jays finishing seventh in the American League East with a record of 53 wins and 109 losses. The Blue Jays were the only American League East team to finish 1979 with a losing record and the loss total of 109 set the franchise mark; it is also the last time as of 2021 the team lost over 100 games in a season. Attendance for the season decreased to 1,431,651.