This list of tallest buildings in Illinois outside of Chicago ranks skyscrapers and high-rises in the U.S. State of Illinois by height excluding Chicago. This list encompasses both Downstate Illinois and cities within the Chicago metropolitan area. The tallest building in Illinois excluding Chicago is Oakbrook Terrace Tower in Oakbrook Terrace, a Chicago suburb. The tallest building in Downstate Illinois is the Illinois State Capitol in Springfield. The tallest habitable building in Downstate Illinois is Wyndham Springfield City Centre in Springfield.
The majority of buildings on this list were built in the mid-late 20th century, although the oldest building is the 1928 Leland Tower in Aurora. In the 21st century, only Evanston and Champaign have built new buildings over . As of September 2025, they are also the only cities to have any buildings approved or proposed at this height.
This list ranks buildings that stand at least tall, based on standard height measurement.