The Gallatin County High School was a high school in Bozeman, Montana that was designed by Fred F. Willson and was built in 1902. It later was renamed Willson School when it was converted to a middle school. It includes Classical Revival, Art Deco, and Romanesque architecture. At 404 West Main Street, it was listed on the National Register of Historic Places in 1988. GCHS was succeeded by the new Bozeman High School in 1956, located a mile west at 205 North 11th Avenue.