Sullivan County Courthouse is a historic courthouse located at Sullivan, Sullivan County, Indiana. It was built between 1926 and 1928, and is a three-story, nearly square, steel frame and concrete, Beaux-Arts style building faced in limestone. All four faces are nearly identical and feature a traditional Corinthian order composite cornice. The central of the each facade has a rounded arch parapet with clock. The building is nearly identical to the Vermillion County Courthouse. It was listed on the National Register of Historic Places in 2008.