Azerbaijan Soviet Socialist Republic

Azerbaijan Socialist Soviet Republic (1920–1922) Азәрбајҹан Сосиалист Совет Республикасы  (Azerbaijani) Азербайджанская Социалистическая Советская Республика  (Russian) Azerbaijan Soviet Socialist Republic (1936–1991) Азәрбајҹан Совет Сосиалист Республикасы  (Azerbaijani) Азербайджанская Советская Социалистическая Республика  (Russian) Republic of Azerbaijan (1991) Азәрбајҹан Республикасы  (Azerbaijani) Азербайджанская Республика  (Russian)
1920–1922 1936–1991
Flag (1956–1991) State emblem (1978–1991)
Motto: Бүтүн өлкәләрин пролетарлары, бирләшин! (Azerbaijani) Bütün ölkələrin proletarları, birləşin! (transliteration) "Proletarians of all countries, unite!"
Anthem:  (1920–1922) Azərbaycan marşı (1944–1991) Азәрбајҹан Совет Сосиалист Республикасынын Һимни Azərbaycan Sovet Sosialist Respublikasının Himni "Anthem of the Azerbaijan Soviet Socialist Republic"
Location of Azerbaijan (red) within the Soviet Union
Status	Independent state (1920–1922) Part of the Transcaucasian SFSR (1922–1936) Union republic (1936–1991) De facto sovereign entity (1989–1991)
Capital	Baku
Common languages	Official languages: Azerbaijani · Russian Minority languages: Armenian · Lezgin
Religion	State atheism
Demonym(s)	Azerbaijani Soviet
Government	1920–1990: Unitary Marxist-Leninist single-party Soviet socialist republic 1990–1991: Unitary presidential republic
Leader
• 1920	Mirza Davud Huseynov (first)
• 1990–1991	Ayaz Mutallibov (last)
Head of government
• 1920–1922	Nariman Narimanov (first)
• 1990–1991	Hasan Hasanov (last)
Legislature	Supreme Soviet
History
• Republic proclaimed	28 April 1920
• Becomes part of the Transcaucasian SFSR	30 December 1922
• Re-established	5 December 1936
• Sovereignty declared	23 September 1989
• Black January	19–20 January 1990
• Renamed Republic of Azerbaijan	5 February 1991
• Independence declared	30 August 1991
• Independence completed	26 December 1991
Population
• 1989 census	7,037,867
Currency	Soviet ruble (руб) (SUR)
Calling code	7 892/895
Preceded by Succeeded by Azerbaijan Democratic Republic Republic of Mountainous Armenia Transcaucasian SSR Azerbaijan Nagorno-Karabakh Republic

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

It was founded on April 28, 1920 as the Azerbaijan SSR. From March 12, 1922 to December 5, 1936, it was part of the Transcaucasian SFSR together with the Armenian SSR and the Georgian SSR. In December 1922, the Transcaucasian SFSR became part of the newly established Soviet Union. The Constitution of Azerbaijan SSR was approved by the 9th Extraordinary All-Azerbaijani Congress of Soviets on March 14, 1937. On November 19, 1990, the Azerbaijan SSR was renamed the "Republic of Azerbaijan" while still a part of the Soviet Union for another year before its collapse and the independence of Azerbaijan in 1991.