The composing hut of Gustav Mahler (German: Gustav Mahler-Komponierhäuschen) is a little museum and memorial in Maiernigg, near Maria Wörth in Carinthia, Austria. It is dedicated to the classical composer Gustav Mahler (1860–1911). In this hut he retreated from 1900 to 1907 in order to compose music. Since 7 July 1986 a permanent exhibition can be seen here. There is also a composing hut at the Attersee, Upper Austria, and one next to the Gustav Mahler Stube in South Tyrol, Italy.