2004 Boston Red Sox season Game log May

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| May 19 | @ Devil Rays | 4 - 1 | Bell (0-1) | 13960 | 24-16 |
| May 20 | @ Devil Rays | 9 - 6 | Lowe (3-4) | 12401 | 24-17 |
| May 21 | Blue Jays | 11 - 5 | Nakamura (0-3) | 35287 | 25-17 |
| May 22 | Blue Jays | 5 - 2 | Ligtenberg (1-2) | 35196 | 26-17 |
| May 23 | Blue Jays | 7 - 2 | Batista (2-4) | 35239 | 27-17 |
| May 25 | Athletics | 12 - 2 | Hudson (5-2) | 35236 | 28-17 |
| May 26 | Athletics | 9 - 6 | Redman (3-3) | 34931 | 29-17 |
| May 27 | Athletics | 15 - 2 | Arroyo (2-2) | 35438 | 29-18 |
| May 28 | Mariners | 8 - 4 | Piñeiro (1-6) | 35134 | 30-18 |
| May 29 | Mariners | 5 - 4 | Wakefield (4-3) | 35250 | 30-19 |