| 13th Chicago Marathon | |
|---|---|
| Venue | Chicago, United States |
| Dates | October 28 |
| Champions | |
| Men | Martín Pitayo (2:09:41) |
| Women | Aurora Cunha (2:30:11) |
The 1990 Chicago Marathon was the 13th running of the annual marathon race in Chicago, United States and was held on October 28. The elite men's race was won by Mexico's Martín Pitayo in a time of 2:09:41 hours and the women's race was won by Portugal's Aurora Cunha in 2:30:11.