| 14th Chicago Marathon | |
|---|---|
| Venue | Chicago, United States |
| Dates | October 27 |
| Champions | |
| Men | Joseildo da Silva (2:14:33) |
| Women | Midde Hamrin (2:36:21) |
The 1991 Chicago Marathon was the 14th running of the annual marathon race in Chicago, United States and was held on October 27. The elite men's race was won by Brazil's Joseildo da Silva in a time of 2:14:33 hours and the women's race was won by Sweden's Midde Hamrin in 2:36:21.