| 109th Boston Marathon | |
|---|---|
 Mina Ogawa during the race | |
| Venue | Boston, United States |
| Dates | April 18 |
| Champions | |
| Men | Hailu Negussie (2:11:45) |
| Women | Catherine Ndereba (2:25:13) |
The 2005 Boston Marathon was the 109th running of the annual marathon race in Boston, United States and was held on April 18. The elite men's race was won by Ethiopia's Hailu Negussie in a time of 2:11:45 hours and the women's race was won by Kenya's Catherine Ndereba in 2:25:13.