The Austrian State Treaty or Austrian Independence Treaty re-established Austria as a sovereign state. It was signed on 15 May 1955 in Vienna, at the Schloss Belvedere among the Allied occupying powers and the Austrian government. The neighbouring Federal People's Republic of Yugoslavia acceded to the treaty subsequently. It officially came into force on 27 July 1955.

Austria was occupied by the Allies and proclaimed independence from Nazi Germany on 27 April 1945, as a result of the Vienna offensive and ended with the Austrian State Treaty on 27 July 1955.