The Azerbaijan Soviet Socialist Republic (Azerbaijani: Азәрбајҹан Совет Сосиалист Республикасы, Azərbaycan Sovet Sosialist Respublikası; Russian: Азербайджанская Советская Социалистическая Республика [АзССР], Azerbaydzhanskaya Sovetskaya Sotsialisticheskaya Respublika [AzSSR] ), also known as the Azerbaijan SSR or Soviet Azerbaijan, was one of the republics that made up the former Soviet Union.