Look up USSR in Wiktionary, the free dictionary.

USSR most commonly refers to the Soviet Union.

USSR may also refer to:

• The Ukrainian Soviet Socialist Republic (1919–1991)
• The Polish Soviet Republic
• The Hungarian Soviet Republic
• The Czechoslovak Soviet Republic
• The Uzbek Soviet Socialist Republic (1924–1991)
• The Romanian Soviet Republic
• The Bulgarian Soviet Socialist Republic
• The Estonian Soviet Republic
• The Union of Soviet Sovereign Republics, a proposed replacement state for the Union of Soviet Socialist Republics
• The USSR, a former Soviet magazine distributed in the United States; its modern successor is Russian Life
• "U.S.S.R." (song), a hit song by eurodance singer Eddy Huntington, recorded in 1986
• "U.S.S.R.", a bonus track from a reissue of Siamese Dream by Smashing Pumpkins