2005 Washington Nationals season Game log September

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| September 11 | Atlanta Braves | 7-9 | Cordero (2-4) | 31384 | 73-71 |
| September 13 | @ New York Mets | 4-2 | Glavine (10-13) | 34143 | 74-71 |
| September 14 | @ New York Mets | 6-3 | Benson (9-8) | 24049 | 75-71 |
| September 15 | @ New York Mets | 6-5 (10) | Hernández (6-6) | 21441 | 76-71 |
| September 16 | @ San Diego Padres | 5-1 | Peavy (12-7) | 38480 | 77-71 |
| September 17 | @ San Diego Padres | 5-8 (12) | Rauch (1-4) | 37707 | 77-72 |
| September 18 | @ San Diego Padres | 1-2 | Eischen (2-1) | 38054 | 77-73 |
| September 20 | San Francisco Giants | 3-4 | Hernández (15-8) | 32403 | 77-74 |
| September 21 | San Francisco Giants | 1-5 | Patterson (9-6) | 32076 | 77-75 |
| September 22 | San Francisco Giants | 2-0 | Tomko (7-15) | 29807 | 78-75 |