Gaustad Hospital is a psychiatric hospital located in the neighborhood of Gaustad in Oslo, Norway. Founded in 1855, it is the oldest purpose-built psychiatric hospital in the country. The hospital opened in 1855 as the nation's first insane asylum designed according to the guidelines laid down in Insane Act of 1848 (Sinnssykeloven). The facility was planned by Herman Wedel Major based upon on the model of foreign institutions.