Wallhausen is a municipality in the Mansfeld-Südharz district of Saxony-Anhalt, Germany. It is located on the Helme river north of the Kyffhäuser mountain range and the border with Thuringia. Wallhausen is part of the Verbandsgemeinde Goldene Aue. The municipality consists of the 4 villages Wallhausen, Hohlstedt, Martinsrieth and Riethnordhausen. The former municipalities Martinsrieth and Riethnordhausen were absorbed into Wallhausen in July 2009.