| 26th Chicago Marathon | |
|---|---|
| Venue | Chicago, United States |
| Dates | October 12 |
| Champions | |
| Men | Evans Rutto (2:05:50) |
| Women | Svetlana Zakharova (2:23:07) |
The 2003 Chicago Marathon was the 26th running of the annual marathon race in Chicago, United States and was held on October 12. The elite men's race was won by Kenya's Evans Rutto in a time of 2:05:50 hours and the women's race was won by Russia's Svetlana Zakharova in 2:23:07.