An Admiral of the Fleet of the Soviet Union (Russian: Адмирал Флота Советского Союза, romanized: Admiral Flota Sovietskogo Soyuza) was the highest naval rank of the Soviet Union.

It was formally established by the Council of Ministers of the Soviet Union on March 3, 1955, and replaced a similarly named rank, Fleet Admiral/Admiral of the Fleet (адмирал флота) that had been equivalent to marshal of the Soviet Union since 1945.

Upon its creation, the only two admirals of the fleet, Nikolai Kuznetsov and Ivan Isakov, were "promoted" to this rank.

Gorshkov died in 1988 and no further appointments were made before the fall of the Soviet Union in 1991 and the elimination of the rank.

From 1962 onwards, it was one grade higher than Fleet Admiral, which was recreated as an intermediate rank, equivalent to Army General.