1980 Toronto Blue Jays season

The 1980 Toronto Blue Jays season was the franchise's fourth season of Major League Baseball. It resulted in the Blue Jays finishing seventh in the American League East with a record of 67 wins and 95 losses. The season represented a turning point as Bobby Mattick became the second field manager in franchise history.

Transactions
Transactions by the Toronto Blue Jays during the off-season before the 1980 season.

Regular season
One of the highlights for the 1980 Blue Jays was the emergence of Dave Stieb as a quality starter. Also, on May 4, Otto Vélez hit four home runs in a doubleheader sweep of the Cleveland Indians, including a walk-off shot in the first game.

Opening Day starters

 * Barry Bonnell
 * Rick Bosetti
 * Dámaso García
 * Alfredo Griffin
 * Roy Howell
 * John Mayberry
 * Dave Stieb
 * Otto Vélez
 * Ernie Whitt
 * Alvis Woods

Transactions
Transactions for the Toronto Blue Jays during the 1980 regular season.

Game log

 * † Game suspended due to curfew after the 14th inning. Completed on August 29. ‡ Game suspended due to rain in the top of the 10th inning.  Completed on September 18.

Starters by position
''Note: Pos = Position; G = Games played; AB = At bats; R = Runs scored; H = Hits; 2B = Doubles; 3B = Triples; Avg. = Batting average; HR = Home runs; RBI = Runs batted in; SB = Stolen bases''

Other batters
''Note: G = Games played; AB = At bats; R = Runs scored; H = Hits; 2B = Doubles; 3B = Triples; Avg. = Batting average; HR = Home runs; RBI = Runs batted in; SB = Stolen bases''

Starting pitchers
Note: G = Games pitched; GS = Games started; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; R = Runs allowed; ER = Earned runs allowed; BB = Walks allowed; K = Strikeouts

Other pitchers
Note: G = Games pitched; GS = Games started; IP = Innings pitched; W = Wins; L = Losses; SV = Saves; ERA = Earned run average; R = Runs allowed; ER = Earned runs allowed; BB = Walks allowed; K = Strikeouts

Relief pitchers
Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; SV = Saves; ERA = Earned run average; R = Runs allowed; ER = Earned runs allowed; BB = Walks allowed; K = Strikeouts

Awards and honours

 * Dave Stieb, Pitcher of the Month Award, April

All-Star Game
 * Dave Stieb