The Grant County Courthouse, built in 1902, is an historic glass-and-copper-domed county courthouse building located at 126 West Main Street in Lancaster, Wisconsin.

Designed by Armand D. Koch in the Classical Revival style, it was built of red sandstone.

the flag of the Confederacy, captured from Archer's troops at the Battle of Gettysburg by the 7th Wisconsin.

On October 19, 1978, it was added to the National Register of Historic Places.

This article about a property in Wisconsin on the National Register of Historic Places is a stub.