The Old DuPage County Courthouse is a Richardsonian Romanesque style court house designed by Mifflin E. Bell in Wheaton, Illinois, United States.

The building served as the seat of government for DuPage County, Illinois from its construction in 1896, until a new courthouse was built in 1990.

The original DuPage County Courthouse was built in 1868 on land purchased from Warren L. Wheaton.

Clarence Darrow defended George Munding in a trial in 1924 that made regional headlines.

Built of red brick, the building features a bell tower and multiple turrets.