Donau

Donau may refer to:
 * Danube (German: Donau), Europe's second-longest river
 * Donau (horse) (1907–1913), American thoroughbred racehorse
 * SS Donau, the name of several steamships
 * GERMAN SHIP Donau, a modern German replenishment ship
 * RC Donau, an Austrian rugby club in Vienna
 * Donau Arena, an arena in Regensburg, Germany
 * Donau City, a part of Vienna, Austria
 * Bernd Donau (born 1946), German footballer