Obernau is a municipality in the district of Altenkirchen, Rhineland-Palatinate, Germany.
Obernau may also refer to: Obernau (Rottenburg), a suburb of Rottenburg am Neckar in the district of Tübingen in Baden-Württemberg, Germany Obernau (Sieg), a river of North Rhine-Westphalia, Germany a district of Kriens, canton of Lucerne, Switzerland a district of Aschaffenburg, Bavaria, Germany a district of Kitzbühel, Tyrol, Austria