Auhausen is a municipality located in the Swabian district of Donau-Ries in Bavaria, Germany. It falls under the jurisdiction of the Oettingen central administrative body.
The town is historically significant as the site of the 1608 meeting that established the Protestant Union, an event known as the Union of Auhausen. Additionally, the municipality houses Schloss Hirschbrunn, a castle owned by the House of Oettingen-Spielberg.