| 113rd Boston Marathon | |
|---|---|
 Deriba Merga during the race | |
| Venue | Boston, United States |
| Dates | April 20 |
| Champions | |
| Men | Deriba Merga (2:08:42) |
| Women | Salina Kosgei (2:32:16) |
The 2009 Boston Marathon was the 113rd running of the annual marathon race in Boston, United States and was held on April 20. The elite men's race was won by Ethiopia's Deriba Merga in a time of 2:08:42 hours and the women's race was won by Ethiopia's Salina Kosgei in 2:32:16.