Wittnau

Wittnau can mean:
 Wittnau, Aargau, a municipality in the district of Laufenburg in the canton of Aargau, Switzerland
 Wittnau, Baden-Württemberg, a municipality in the district of Breisgau-Hochschwarzwald in Baden-Württemberg, Deutschland

 Other 
 Widnau, a municipality in the Wahlkreis of Rheintal in the canton of St. Gallen, Switzerland