USSR most often refers to the Soviet Union.

USSR may also refer to:

• 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 song by Eddy Huntington, recorded in 1986
• "U.S.S.R.", a bonus track from a reissue of Siamese Dream by Smashing Pumpkins

• CCCP (disambiguation)
• SSSR (disambiguation)
• Soviet Union (disambiguation), including Sovetsky Soyuz
• Ukrainian Soviet Socialist Republic, normally abbreviated as UkrSSR
• Uzbek Soviet Socialist Republic, normally abbreviated as UzSSR