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Flags of the Soviet Socialist Republics all featured predominantly red flag with hammer and sickle that both symbolised communism, quite similar to the flag of the Soviet Union. Their final versions prior to the dissolution of the USSR in 1991 looked like this:
| Flag of Armenian SSR | Flag of Azerbaijan SSR | Flag of Byelorussian SSR |
| Flag of Estonian SSR | Flag of Georgian SSR | Flag of Kazakh SSR |
| Flag of Kirghiz SSR | Flag of Latvian SSR | Flag of Lithuanian SSR |
| Flag of Moldavian SSR | Flag of Russian SFSR | Flag of Tadzhik SSR |
| Flag of Turkmen SSR | Flag of Ukrainian SSR | Flag of Uzbek SSR |