Aumühle (German: [aʊˈmyːlə] ⓘ) is a municipality in Schleswig-Holstein in northern Germany, about 21 km (14 mi) east of Hamburg.

Its Friedrichsruh district is home to the family estate and mausoleum of Otto von Bismarck.

Aumühle lies on the river Bille in the Sachsenwald, the largest forest in Schleswig-Holstein.

In 1871 Kaiser Wilhelm I of Germany gifted the Sachsenwald forest, adjacent to the Au, to Otto von Bismarck in recognition of his services to the newly unified German nation.

Karl Dönitz, the last head of state of Nazi Germany, moved to Aumühle after his release from Spandau Prison in 1956.