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.

Offseason Transactions Transactions by the Toronto Blue Jays during the off-season before the 1984 season. November 1983 Randy Moffitt granted free agency. Signed amateur free agent Sil Campusano to a contract.

December 1983 Drafted Kelly Gruber from the Cleveland Indians in the 1983 MLB Rule 5 draft. Dave Geisel drafted by the Seattle Mariners in the 1983 MLB Rule 5 draft. Drafted José Segura from the Philadelphia Phillies in the 1983 Minor League Draft. Acquired Bryan Clark from the Seattle Mariners for Barry Bonnell. Acquired Willie Aikens from the Kansas City Royals for Jorge Orta.

January 1984 Signed free agent Dennis Lamp from the Chicago White Sox to a five-year contract.

March 1984 Acquired Derwin McNealy from the New York Yankees for Don Cooper.

April 1984 Signed free agent Manny Castillo from the Seattle Mariners to a contract. Signed free agent Rick Leach from the Detroit Tigers to a contract.

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.Great Baseball Feats, Facts and Figures, 2008 Edition, p.232, David Nemec and Scott Flatow, A Signet Book, Penguin Group, New York, 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

Season standings

Record vs. opponents

Transactions Transactions for the Toronto Blue Jays during the 1984 regular season. May 1984 Signed free agent Mike Proly from the Chicago Cubs to a contract. Player rights of Geno Petralli sold to the Cleveland Indians. Released Joey McLaughlin. Signed amateur free agent Rob Ducey to a contract.

June 1984 Purchased the contract of Ron Musselman from the Texas Rangers. Signed free agent Don Gordon from the Detroit Tigers to a contract.

August 1984 Signed amateur free agent Domingo Martínez to a contract.

September 1984 Released Alvis Woods. Signed amateur free agent Vince Horsman.

Roster 1984 Toronto Blue Jays Roster Pitchers Catchers

Infielders Outfielders

Other batters Manager

Coaches

Game log

|- align="center" bgcolor="ffbbbb" | 1 || April 4 || @ Mariners || 2–3 (10) || Stanton (1–0) || Lamp (0–1) || || 43,200 || 0–1 |- align="center" bgcolor="bbffbb" | 2 || April 5 || @ Mariners || 13–5 || Leal (1–0) || Beattie (0–1) || || 5,399 || 1–1 |- align="center" bgcolor="bbffbb" | 3 || April 6 || @ Angels || 11–5 || Key (1–0) || Brown (0–1) || || 24,431 || 2–1 |- align="center" bgcolor="bbffbb" | 4 || April 7 || @ Angels || 3–1 || Stieb (1–0) || Forsch (1–1) || Lamp (1) || 41,859 || 3–1 |- align="center" bgcolor="ffbbbb" | 5 || April 8 || @ Angels || 3–4 || Sánchez (1–1) || Jackson (0–1) || || 24,095 || 3–2 |- align="center" bgcolor="ffbbbb" | 6 || April 9 || @ Athletics || 3–4 || Caudill (1–0) || Lamp (0–2) || || 9,868 || 3–3 |- align="center" bgcolor="bbffbb" | 7 || April 10 || @ Athletics || 3–0 || Leal (2–0) || Sorensen (1–1) || Jackson (1) || 7,226 || 4–3 |- align="center" bgcolor="bbffbb" | 8 || April 13 || @ Rangers || 3–2 || Lamp (1–2) || Tobik (1–2) || Key (1) || 10,515 || 5–3 |- align="center" bgcolor="ffbbbb" | 9 || April 14 || @ Rangers || 2–6 || Hough (1–1) || Clancy (0–1) || || 9,852 || 5–4 |- align="center" bgcolor="bbffbb" | 10 || April 15 || @ Rangers || 2–1 || Lamp (2–2) || Stewart (0–3) || || 12,583 || 6–4 |- align="center" bgcolor="bbffbb" | 11 || April 17 || Orioles || 3–2 || Key (2–0) || Martinez (0–1) || Lamp (2) || 35,602 || 7–4 |- align="center" bgcolor="bbffbb" | 12 || April 18 || Orioles || 7–1 || Stieb (2–0) || Palmer (0–2) || || 13,489 || 8–4 |- align="center" bgcolor="bbffbb" | 13 || April 19 || Orioles || 2–1 || Clancy (1–1) || McGregor (1–3) || || 14,323 || 9–4 |- align="center" bgcolor="ffbbbb" | 14 || April 20 || Angels || 6–10 (13) || Sánchez (2–1) || Acker (0–1) || || 37,241 || 9–5 |- align="center" bgcolor="ffbbbb" | 15 || April 21 || Angels || 4–8 || Romanick (2–1) || Gott (0–1) || || 44,164 || 9–6 |- align="center" bgcolor="ffbbbb" | 16 || April 22 || Angels || 6–9 || Slaton (1–0) || Key (2–1) || Kaufman (1) || 16,462 || 9–7 |- align="center" bgcolor="bbffbb" | 17 || April 23 || Mariners || 8–5 || Stieb (3–0) || Langston (1–1) || Jackson (2) || 13,330 || 10–7 |- align="center" bgcolor="ffbbbb" | 18 || April 24 || Mariners || 2–4 || Beard (1–0) || Clancy (1–2) || || 12,398 || 10–8 |- align="center" bgcolor="bbffbb" | 19 || April 25 || Athletics || 11–0 || Leal (3–0) || Conroy (0–2) || || 15,434 || 11–8 |- align="center" bgcolor="ffbbbb" | 20 || April 26 || Athletics || 4–7 || Warren (3–2) || Gott (0–2) || Burgmeier (2) || 16,488 || 11–9 |- align="center" bgcolor="bbffbb" | 21 || April 27 || @ Royals || 1–0 || Alexander (1–0) || Gubicza (0–2) || Lamp (3) || 16,435 || 12–9 |- align="center" bgcolor="bbffbb" | 22 || April 28 || @ Royals || 6–0 || Stieb (4–0) || Saberhagen (1–1) || || 18,194 || 13–9 |- align="center" bgcolor="bbbbbb" | -- || April 29 || @ Royals || colspan=6|Postponed (rain) Rescheduled for July 23 |- align="center" bgcolor="bbbbbb" | -- || April 30 || Rangers || colspan=6|Postponed (wind) Rescheduled for May 1

|- align="center" bgcolor="bbffbb" | 23 || May 1 || Rangers || 10–4 || Leal (4–0) || Tanana (2–3) || Lamp (4) || || 14–9 |- align="center" bgcolor="ffbbbb" | 24 || May 1 || Rangers || 1–4 || Darwin (3–0) || Alexander (1–1) || || 13,159 || 14–10 |- align="center" bgcolor="bbffbb" | 25 || May 2 || Rangers || 7–6 || Clancy (2–2) || Hough (1–4) || Lamp (5) || 13,274 || 15–10 |- align="center" bgcolor="bbffbb" | 26 || May 4 || Royals || 4–3 (10)|| Stieb (5–0) || Huismann (0–2) || || 16,469 || 16–10 |- align="center" bgcolor="bbffbb" | 27 || May 5 || Royals || 10–1 || Gott (1–2) || Jackson (0–3) || || 31,076 || 17–10 |- align="center" bgcolor="bbffbb" | 28 || May 6 || Royals || 2–1 || Jackson (1–1) || Gura (4–1) || || 23,334 || 18–10 |- align="center" bgcolor="bbbbbb" | -- || May 7 || @ Orioles || colspan=6|Postponed (wet grounds) Rescheduled for May 10 |- align="center" bgcolor="bbbbbb" | -- || May 8 || @ Orioles || colspan=6|Postponed (rain) Rescheduled for May 9 |- align="center" bgcolor="ffbbbb" | 29 || May 9 || @ Orioles || 4–7 || McGregor (4–3) || Clancy (2–3) || || || 18–11 |- align="center" bgcolor="ffbbbb" | 30 || May 9 || @ Orioles || 3–7 || Martinez (1–3) || Key (2–2) || || 18,731 || 18–12 |- align="center" bgcolor="bbffbb" | 31 || May 10 || @ Orioles || 4–3 (10)|| Jackson (2–1) || Martínez (1–1) || || 11,214 || 19–12 |- align="center" bgcolor="bbbbbb" | -- || May 11 || @ Indians || colspan=6|Postponed (rain) Rescheduled for May 13 |- align="center" bgcolor="ffbbbb" | 32 || May 12 || @ Indians || 4–8 || Blyleven (4–2) || Acker (0–2) || Camacho (4) || 11,066 || 19–13 |- align="center" | 33 || May 13 || @ Indians || 4–4 (8) || colspan=3|Postponed (rain) Rescheduled for August 14 || 5,630 || 19–13 |- align="center" bgcolor="bbbbbb" | -- || May 13 || @ Indians || colspan=6|Postponed (rain) Rescheduled for August 15 |- align="center" bgcolor="bbffbb" | 34 || May 15 || @ Twins || 5–2 (10)|| Jackson (3–1) || Davis (2–3) || || 26,761 || 20–13 |- align="center" bgcolor="bbffbb" | 35 || May 16 || @ Twins || 8–7 || Alexander (2–1) || Filson (3–1) || Acker (1) || 51,863 || 21–13 |- align="center" bgcolor="bbffbb" | 36 || May 17 || White Sox || 3–2 || Jackson (4–1) || Hoyt (3–5) || Lamp (6) || 18,328 || 22–13 |- align="center" bgcolor="bbffbb" | 37 || May 18 || White Sox || 4–3 || Clancy (3–3) || Burns (2–2) || Key (2) || 19,507 || 23–13 |- align="center" bgcolor="bbffbb" | 38 || May 19 || White Sox || 1–0 || Gott (2–2) || Seaver (4–3) || Lamp (7) || 28,382 || 24–13 |- align="center" bgcolor="ffbbbb" | 39 || May 20 || White Sox || 0–3 || Dotson (6–2) || Stieb (5–1) || || 26,347 || 24–14 |- align="center" bgcolor="bbffbb" | 40 || May 21 || Twins || 3–2 || Alexander (3–1) || Davis (2–4) || || 43,347 || 25–14 |- align="center" bgcolor="bbffbb" | 41 || May 22 || Twins || 3–2 || Jackson (5–1) || Smithson (6–4) || || 17,287 || 26–14 |- align="center" bgcolor="bbffbb" | 42 || May 23 || Twins || 4–1 || Clancy (4–3) || Viola (4–5) || Lamp (8) || 17,189 || 27–14 |- align="center" bgcolor="bbffbb" | 43 || May 25 || Indians || 5–1 || Stieb (6–1) || Heaton (2–4) || || 18,195 || 28–14 |- align="center" bgcolor="bbffbb" | 44 || May 26 || Indians || 2–1 || Alexander (4–1) || Farr (0–3) || Key (3) || 22,283 || 29–14 |- align="center" bgcolor="bbffbb" | 45 || May 27 || Indians || 6–1 || Leal (5–0) || Sutcliffe (3–4) || || || 30–14 |- align="center" bgcolor="bbffbb" | 46 || May 27 || Indians || 6–5 || Jackson (6–1) || Camacho (1–4) || || 37,097 || 31–14 |- align="center" bgcolor="bbbbbb" | -- || May 28 || @ White Sox || colspan=6|Postponed (rain) Rescheduled for August 30 |- align="center" bgcolor="ffbbbb" | 47 || May 29 || @ White Sox || 1–8 || Hoyt (4–5) || Clancy (4–4) || || 19,603 || 31–15 |- align="center" bgcolor="bbffbb" | 48 || May 30 || @ White Sox || 2–1 || Stieb (7–1) || Burns (2–4) || Key (4) || 23,490 || 32–15

|- align="center" bgcolor="bbffbb" | 49 || June 1 || Yankees || 10–2 || Alexander (5–1) || Fontenot (1–5) || || 30,586 || 33–15 |- align="center" bgcolor="bbffbb" | 50 || June 2 || Yankees || 9–8 (10)|| Lamp (3–2) || Christiansen (1–2) || || 42,269 || 34–15 |- align="center" bgcolor="ffbbbb" | 51 || June 3 || Yankees || 2–15 || Niekro (8–3) || Clancy (4–5) || || 33,077 || 34–16 |- align="center" bgcolor="ffbbbb" | 52 || June 4 || @ Tigers || 3–6 (10)|| López (5–0) || Key (2–3) || || 26,733 || 34–17 |- align="center" bgcolor="bbffbb" | 53 || June 5 || @ Tigers || 8–4 || Acker (1–2) || Abbott (2–2) || || 35,983 || 35–17 |- align="center" bgcolor="bbffbb" | 54 || June 6 || @ Tigers || 6–3 || Leal (6–0) || Petry (8–3) || || 38,167 || 36–17 |- align="center" bgcolor="ffbbbb" | 55 || June 7 || @ Tigers || 3–5 || Morris (11–2) || Clancy (4–6) || || 40,879 || 36–18 |- align="center" bgcolor="ffbbbb" | 56 || June 8 || @ Yankees || 3–4 (11)|| Righetti (2–0) || Acker (1–3) || || 20,252 || 36–19 |- align="center" bgcolor="ffbbbb" | 57 || June 9 || @ Yankees || 1–2 || Guidry (5–4) || Stieb (7–2) || || 20,661 || 36–20 |- align="center" bgcolor="ffbbbb" | 58 || June 10 || @ Yankees || 3–5 || Christiansen (2–2) || Alexander (5–2) || Righetti (7) || 41,018 || 36–21 |- align="center" bgcolor="ffbbbb" | 59 || June 11 || Tigers || 4–5 || Rozema (2–0) || Leal (6–1) || Hernández (10) || 35,062 || 36–22 |- align="center" bgcolor="bbffbb" | 60 || June 12 || Tigers || 12–3 || Clancy (5–6) || Morris (11–3) || || 40,437 || 37–22 |- align="center" bgcolor="bbffbb" | 61 || June 13 || Tigers || 7–3 || Stieb (8–2) || Wilcox (7–4) || || 34,122 || 38–22 |- align="center" bgcolor="bbffbb" | 62 || June 15 || Red Sox || 4–3 (11)|| Lamp (4–2) || Clear (5–1) || || 30,065 || 39–22 |- align="center" bgcolor="bbffbb" | 63 || June 16 || Red Sox || 7–0 || Leal (7–1) || Hurst (8–5) || || 31,278 || 40–22 |- align="center" bgcolor="bbffbb" | 64 || June 17 || Red Sox || 5–3 || Clancy (6–6) || Gale (1–1) || Jackson (3) || 28,396 || 41–22 |- align="center" bgcolor="ffbbbb" | 65 || June 19 || Brewers || 5–6 || Fingers (1–2) || Key (2–4) || || 32,210 || 41–23 |- align="center" bgcolor="ffbbbb" | 66 || June 20 || Brewers || 4–5 || Tellmann (2–1) || Alexander (5–3) || || 31,282 || 41–24 |- align="center" bgcolor="bbffbb" | 67 || June 21 || @ Red Sox || 5–2 || Leal (8–1) || Nipper (0–2) || || 18,372 || 42–24