|Flag of the Soviet Union|
|Adopted||November 12, 1923 |
The obverse of the flag of the 1923-1991 former Soviet Union was red with a small golden stylized hammer and sickle symbol in the canton. The reverse was a plain red field. 
The red colour represented Communism, the state ideology of the Soviet Union. the symbol in the top left corner is the symbol of the Communist Party, the hammer and the sickle represent the union of of the proletariat (the industrial workers) and the peasants. The star represents the party's guidance of both.
|Republics of the Soviet Union|
|Armenian SSR ● Azerbaijan SSR ● Byelorussian SSR ● Estonian SSR ● Georgian SSR Moldavian SSR ● Russian SFSR ● Tajik SSR ● Turkmen SSR ● Ukrainian SSR ● Uzbek SSR|
|Short-Lived Republics: Karelo-Finnish SSR ● Transcaucasian SFSR|