| State: | IL |
| Type: | IL 1926 |
| Maint: | none |
| Route: | 118 |
| Map Custom: | yes |
| Map Notes: | IL 118 highlighted in red--> |
| Direction A: | West |
| Terminus A: | in Elmhurst |
| Junction: |
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| Direction B: | East |
| Terminus B: | in Maywood |
| Established: | 1935 |
| Decommissioned: | 1938 |
| Previous Type: | IL |
| Previous Route: | 117 |
| Next Type: | IL |
| Next Route: | 119 |
| Counties: | DuPage, Cook |
Illinois Route 118 (IL 118) was an east–west state highway in Illinois. Located in the Chicago metropolitan area, the route traveled from Elmhurst to Maywood primarily along St. Charles Road.
IL 118 began at IL 64 (North Avenue) and traveled south along West Avenue. IL 118 then traveled eastward along St. Charles Road, serving the municipalities of Berkeley, Bellwood, and Maywood. IL 118 briefly travels north along 5th Avenue before ending at US 20 (Lake Street).
IL 118 first appeared in 1929 to connect from US 66/IL 4 in Pontiac to IL 17 (now IL 18)/IL 23 in Streator through Cornell. By 1935, IL 118 was supplanted by an extension of IL 23.
Before 1935, IL 64 used to travel along St. Charles Road from Elmhurst to Maywood. Then, in 1935, IL 64 was realigned to travel along North Avenue, absorbing part of IL 54; IL 54 instead traveled north along York Road and present-day IL 83 and US 45. With the realignment of IL 64, IL 118 was created. In 1938, without any intermediate changes, IL 118 was removed.