2004 Boston Red Sox season Game log September

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| September 21 | Orioles | 3 - 2 | Ryan (3-6) | 35083 | 90-60 |
| September 22 | Orioles | 7 - 6 (12) | Bauer (1-1) | 35103 | 91-60 |
| September 23 | Orioles | 9 - 7 | Mendoza (1-1) | 35026 | 91-61 |
| September 24 | Yankees | 6 - 4 | Martínez (16-8) | 35022 | 91-62 |
| September 25 | Yankees | 12 - 5 | Quantrill (6-3) | 34856 | 92-62 |
| September 26 | Yankees | 11 - 4 | Brown (10-5) | 34582 | 93-62 |
| September 27 | @ Devil Rays | 7 - 3 | Sosa (4-7) | 17602 | 94-62 |
| September 28 | @ Devil Rays | 10 - 8 (11) | Báez (4-4) | 20116 | 95-62 |
| September 29 | @ Devil Rays | 9 - 4 | Martínez (16-9) | 21274 | 95-63 |