1977 Seattle Mariners season Game log May

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| May 11 | New York Yankees | 5-2 | Holtzman (2-2) | 23978 | 10-24 |
| May 12 | New York Yankees | 8-6 | Hunter (1-2) | 42132 | 11-24 |
| May 13 | Boston Red Sox | 5-7 | Romo (0-2) | 20523 | 11-25 |
| May 14 | Boston Red Sox | 4-8 | Thomas (1-5) | 52485 | 11-26 |
| May 15 | Boston Red Sox | 4-5 | Jones (0-2) | 47353 | 11-27 |
| May 16 | Baltimore Orioles | 8-3 | Palmer (5-3) | 10388 | 12-27 |
| May 17 | Baltimore Orioles | 10-2 | May (4-4) | 10920 | 13-27 |
| May 19 | @ Oakland Athletics | 3-0 | Langford (3-3) | 2179 | 14-27 |
| May 20 | @ Oakland Athletics | 5-14 | Jones (0-3) | 2660 | 14-28 |
| May 21 | @ Oakland Athletics | 7-6 | Lacey (1-1) | 3230 | 15-28 |
| May 22 | @ Oakland Athletics | 6-2 | Blue (3-4) | 3138 | 16-28 |