1991 Toronto Blue Jays season Game log September

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| September 11 | Mariners | 7 - 3 | Key (15-10) | 50321 | 79-62 |
| September 13 | Athletics | 7 - 6 | Stewart (11-9) | 50315 | 80-62 |
| September 14 | Athletics | 6 - 0 | Welch (11-12) | 50319 | 81-62 |
| September 15 | Athletics | 10 - 5 | Stottlemyre (13-8) | 50315 | 81-63 |
| September 16 | @ Mariners | 6 - 5 (11) | MacDonald (3-3) | 55612 | 81-64 |
| September 17 | @ Mariners | 5 - 4 (11) | Acker (3-5) | 29115 | 81-65 |
| September 18 | @ Mariners | 5 - 3 (12) | Bankhead (2-6) | 30200 | 82-65 |
| September 20 | @ Athletics | 6 - 5 (11) | Ward (7-6) | 33765 | 82-66 |
| September 21 | @ Athletics | 4 - 0 | Key (15-11) | 36601 | 82-67 |
| September 22 | @ Athletics | 3 - 2 | Darling (3-5) | 28276 | 83-67 |