2004 Boston Red Sox season Game log May

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| May 9 | Royals | 8 - 4 | Lowe (3-3) | 34589 | 19-12 |
| May 10 | Indians | 10 - 6 | Kim (1-1) | 35257 | 19-13 |
| May 11 | Indians | 5 - 3 | Jiménez (0-2) | 35401 | 20-13 |
| May 12 | Indians | 6 - 4 | Wakefield (2-2) | 35371 | 20-14 |
| May 13 | @ Blue Jays | 12 - 6 | Schilling (4-3) | 20876 | 20-15 |
| May 14 | @ Blue Jays | 9 - 3 (10) | Ligtenberg (1-1) | 20948 | 21-15 |
| May 15 | @ Blue Jays | 4 - 0 | Hentgen (2-3) | 36841 | 22-15 |
| May 16 | @ Blue Jays | 3 - 1 | Martínez (4-3) | 31618 | 22-16 |
| May 18 | @ Devil Rays | 7 - 3 | Hendrickson (2-4) | 12836 | 23-16 |