Au
Au can refer to:
Au (Breisgau)
a municipality in the Breisgau-Hochschwarzwald district, Germany- Au-ill.jpg
Au (Illertissen)
a former municipality, now part of Illertissen, Germany 
Au (Vorarlberg)
a municipality in the Vorarlberg State, Austria
Au am Leithaberge
a municipality in the Burgenland State, Austria
Au am Rhein
a municipality in the Rastatt district, Germany
Au im Murgtal
a former municipality, now part of Weisenbach, Germany
Au in der Hallertau
a municipality in the Freising district, Germany
