| 28th Chicago Marathon | |
|---|---|
 Runners at the start of the race | |
| Venue | Chicago, United States |
| Dates | October 9 |
| Champions | |
| Men | Felix Limo (2:07:02) |
| Women | Deena Kastor (2:21:25) |
The 2005 Chicago Marathon was the 28th running of the annual marathon race in Chicago, United States and was held on October 9. The elite men's race was won by Kenya's Felix Limo in a time of 2:07:02 hours and the women's race was won by home athlete Deena Kastor in 2:21:25.