1980 Toronto Blue Jays season Game log May

| Date_ | Opponent | Score | Loss | Record |
|---|---|---|---|---|
| May 1 | Indians | 2–1 | Lemanczyk (1–3) | 9–8 |
| May 2 | Indians | 6–1 | Stieb (3–1) | 9–9 |
| May 3 | Indians | 8–3 | Waits (1–3) | 10–9 |
| May 4 | Indians | 9–8 (10) | Monge (0–1) | 11–9 |
| May 4 | Indians | 7–2 | Owchinko (0–3) | 12–9 |
| May 6 | @ Angels | 3–2 | Aase (3–2) | 13–9 |
| May 7 | @ Angels | 7–3 | Knapp (0–2) | 14–9 |
| May 8 | @ Angels | 9–2 | Frost (3–3) | 15–9 |
| May 9 | @ Athletics | Postponed (rain) Rescheduled for July 22 | Postponed (rain) Rescheduled for July 22 | Postponed (rain) Rescheduled for July 22 |
| May 10 | @ Athletics | 4–3 | Garvin (0–2) | 15–10 |
| May 11 | @ Athletics | 12–1 | Lemanczyk (2–4) | 15–11 |