| 21st Chicago Marathon | |
|---|---|
| Venue | Chicago, United States |
| Dates | October 11 |
| Champions | |
| Men | Ondoro Osoro (2:06:54) |
| Women | Joyce Chepchumba (2:23:57) |
The 1998 Chicago Marathon was the 21st running of the annual marathon race in Chicago, United States and was held on October 11. The elite men's race was won by Kenya's Ondoro Osoro in a time of 2:06:54 hours and the women's race was won in 2:23:57 by Joyce Chepchumba, also of Kenya.