| Competition: | 28th Chicago Marathon |
| Venue: | Chicago, United States |
| Dates: | October 9 |
| Men: | Felix Limo |
| Men Win Value: | 2:07:02 |
| Women: | Deena Kastor |
| Women Win Value: | 2:21:25 |
| Prev: | 2004 |
| Next: | 2006 |
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.
| Position | Athlete | Nationality | Time | |
|---|---|---|---|---|
| 1 | Felix Limo | 2:07:02 | ||
| 2 | Benjamin Maiyo | 2:07:09 | ||
| 3 | Daniel Njenga | 2:07:14 | ||
| 4 | Evans Rutto | 2:07:28 | ||
| 5 | Patrick Ivuti | 2:07:46 | ||
| 6 | Laban Kipkemboi | 2:09:22 | ||
| 7 | William Kipsang | 2:09:49 | ||
| 8 | Timothy Cherigat | 2:10:34 | ||
| 9 | Sammy Korir | 2:10:53 | ||
| 10 | John Gwako | 2:12:30 |
| Position | Athlete | Nationality | Time | |
|---|---|---|---|---|
| 1 | Deena Kastor | 2:21:25 | ||
| 2 | Constantina Diță | 2:21:30 | ||
| 3 | Masako Chiba | 2:26:00 | ||
| 4 | Colleen De Reuck | 2:28:40 | ||
| 5 | Eri Hayakawa | 2:28:50 | ||
| 6 | Blake Russell | 2:29:10 | ||
| 7 | Kathy Butler | 2:30:01 | ||
| 8 | Tatyana Petrova Arkhipova | 2:31:03 | ||
| 9 | Kate Smyth | 2:33:42 | ||
| 10 | Grażyna Syrek | 2:36:32 |