| 107th Boston Marathon | |
|---|---|
 Men's winner Robert Kipkoech Cheruiyot | |
| Venue | Boston, United States |
| Dates | April 21 |
| Champions | |
| Men | Robert Kipkoech Cheruiyot (2:10:11) |
| Women | Svetlana Zakharova (2:25:20) |
The 2003 Boston Marathon was the 107th running of the annual marathon race in Boston, United States and was held on April 21. The elite men's race was won by Kenya's Robert Kipkoech Cheruiyot in a time of 2:10:11 hours and the women's race was won by Russia's Svetlana Zakharova in 2:25:20.