2005 Seattle Mariners season Game log May

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| May 25 | @ Orioles | 3–1 | Moyer (4–2) | 18820 | 18–27 |
| May 26 | @ Orioles | 5–2 | Franklin (2–6) | 22166 | 18–28 |
| May 27 | @ Devil Rays | 5–4 | Meche (4–3) | 10130 | 18–29 |
| May 28 | @ Devil Rays | 3–2 | Fossum (2–3) | 13281 | 19–29 |
| May 29 | @ Devil Rays | 10–9 | McClung (0–2) | 13851 | 20–29 |
| May 30 | Blue Jays | 4–3 | Lilly (3–5) | 25540 | 21–29 |
| May 31 | Blue Jays | 9–7 | Franklin (2–7) | 25737 | 21–30 |