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.
Offseason
Transactions
Transactions by the Toronto Blue Jays during the off-season before the 1980 season.
October 1979
November 1979
December 1979
January 1980
March 1980
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.
Season standings
Record vs. opponents
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.
April 1980
May 1980
June 1980
July 1980
August 1980
September 1980
Roster
Game log
|- align="center" bgcolor="ffbbbb" | 1 || April 9 || @ Mariners || 8–6 || Parrott (1–0) || Lemanczyk (0–1) || Heaverlo (1) || 22,588 || 0–1 |- align="center" bgcolor="bbffbb" | 2 || April 11 || @ Mariners || 10–7 (11) || Moore (1–0) || Dressler (0–1) || || 6,104 || 1–1 |- align="center" bgcolor="ffbbbb" | 3 || April 12 || @ Mariners || 3–2 (10) || Honeycutt (1–0) || Garvin (0–1) || || 6,773 || 1–2 |- align="center" bgcolor="ffbbbb" | 4 || April 13 || @ Mariners || 5–1 || Bannister (1–0) || Lemanczyk (0–2) || || 4,567 || 1–3 |- align="center" bgcolor="bbbbbb" | – || April 14 || Brewers || colspan=6|Postponed (rain) Rescheduled for July 13 |- align="center" bgcolor="bbffbb" | 5 || April 16 || Brewers || 11–2 || Stieb (1–0) || Slaton (0–1) || || 12,688 || 2–3 |- align="center" bgcolor="bbffbb" | 6 || April 17 || Brewers || 1–0 || Mirabella (1–0) || Sorensen (1–1) || || 11,235 || 3–3 |- align="center" bgcolor="ffbbbb" | 7 || April 19 || @ Indians || 8–1 || Waits (1–1) || Clancy (0–1) || || 61,753 || 3–4 |- align="center" bgcolor="bbffbb" | 8 || April 20 || @ Indians || 5–3 || Lemanczyk (1–2) || Denny (0–2) || McLaughlin (1) || 11,220 || 4–4 |- align="center" bgcolor="bbffbb" | 9 || April 21 || @ Royals || 7–1 || Stieb (2–0) || Gale (0–2) || || 21,117 || 5–4 |- align="center" bgcolor="ffbbbb" | 10 || April 22 || @ Royals || 7–2 || Splittorff (2–0) || Mirabella (1–1) || || 16,993 || 5–5 |- align="center" bgcolor="ffbbbb" | 11 || April 23 || @ Royals || 7–4 || Christenson (1–0) || McLaughlin (0–1) || Quisenberry (2) || 18,855 || 5–6 |- align="center" bgcolor="bbffbb" | 12 || April 25 || @ Brewers || 5–3 || McLaughlin (1–1) || Sorensen (1–2) || || 9,902 || 6–6 |- align="center" bgcolor="bbffbb" | 13 || April 26 || @ Brewers || 4–0 || Stieb (3–0) || Caldwell (2–1) || || 11,038 || 7–6 |- align="center" bgcolor="bbffbb" | 14 || April 27 || @ Brewers || 8–2 || Mirabella (2–1) || Haas (1–3) || Moore (1) || 11,099 || 8–6 |- align="center" bgcolor="bbbbbb" | – || April 28 || Royals || colspan=6|Postponed (rain) Rescheduled for August 8 |- align="center" bgcolor="bbffbb" | 15 || April 29 || Royals || 3–1 || Clancy (1–1) || Leonard (0–3) || || 11,553 || 9–6 |- align="center" bgcolor="ffbbbb" | 16 || April 30 || Royals || 3–0 || Gura (3–1) || Jefferson (0–1) || || 14,029 || 9–7 |-