The Presidium of the Supreme Soviet was the standing body of the highest body of state authority in the Union of Soviet Socialist Republics (USSR). The presidium was elected by joint session of both houses of the Supreme Soviet to act on its behalf while the Supreme Soviet was not in session. By the 1936 and 1977 Soviet Constitution, the Presidium of the Supreme Soviet served as the collective head of state of the USSR. In all its activities, the Presidium was accountable to the Supreme Soviet of the USSR.

The Supreme Soviet of the Union of Soviet Socialist Republics was, from 1936 to 1991, the highest body of state authority of the Union of Soviet Socialist Republics (USSR), and based on the principle of unified power was the only branch of government in the Soviet state.