| 27th Chicago Marathon | |
|---|---|
| Venue | Chicago, United States |
| Dates | October 10 |
| Champions | |
| Men | Evans Rutto (2:06:44) |
| Women | Constantina Diță (2:23:44) |
The 2004 Chicago Marathon was the 27th running of the annual marathon race in Chicago, United States and was held on October 10. The elite men's race was won by Kenya's Evans Rutto in a time of 2:06:44 hours and the women's race was won by Romania's Constantina Diță in 2:23:44.