1984 Toronto Blue Jays season

The 1984 Toronto Blue Jays season was the franchise's eighth season of Major League Baseball. It resulted in the Blue Jays finishing second in the American League East with a record of 89 wins and 73 losses.

Transactions
Transactions by the Toronto Blue Jays during the off-season before the 1984 season.

Regular season

 * August 19, 1984: In a game against the Oakland Athletics, Cliff Johnson hit the 19th pinch home run of his career, breaking Jerry Lynch's record of 18.
 * Jimmy Key set a team record for rookie pitchers by appearing in 63 games.
 * Lloyd Moseby and Dave Collins each led the American League with 15 triples.
 * Rance Mulliniks sets a team record by getting 8 consecutive hits.
 * Dave Stieb finished second in the American League in strikeouts and ERA.

Opening Day starters

 * Jim Clancy
 * Jesse Barfield
 * George Bell
 * Dámaso García
 * Alfredo Griffin
 * Cliff Johnson
 * Lloyd Moseby
 * Rance Mulliniks
 * Willie Upshaw
 * Ernie Whitt

Transactions
Transactions for the Toronto Blue Jays during the 1984 regular season.

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

Award winners

 * Doyle Alexander, Pitcher of the Month Award, September
 * Dave Collins, American League Leader, Triples, 15
 * Lloyd Moseby, American League Leader, Triples, 15

All-Star Game
 * Dámaso García, second base
 * Alfredo Griffin, shortstop
 * Dave Stieb, pitcher