The Winnebago County Courthouse is a five-story county courthouse built in 1937 and located in Oshkosh, Wisconsin. It houses the circuit court and government offices of Winnebago County, Wisconsin. The building was listed on the National Register of Historic Places in 1982 and on the State Register of Historic Places in 1989 for its statewide significance as an example of Moderne architecture, a variety of Art Deco.