| Conventional Long Name: | Yakut Autonomous Soviet Socialist Republic |
| Native Name: | |
| Common Name: | Yakut ASSR |
| Subdivision: | ASSR |
| Nation: | the Russian SFSR |
| P1: | Yakutsk Oblast |
| Flag P1: | Flag of Russia.svg |
| S1: | Sakha Republic |
| Flag S1: | Flag of Sakha.svg |
| Flag Type: | Flag (1978–1991) |
| Image Map Caption: | Map of Yakut ASSR (Green) within USSR (Dark Grey) |
| Capital: | Yakutsk |
| Title Leader: | First Secretary |
| Leader1: | Maksim Ammosov |
| Year Leader1: | 1920 - 1921 (first) |
| Leader2: | Yuri Prokopyev |
| Year Leader2: | 1982 - 1991 (last) |
| Title Deputy: | Chairman of the Council of People's Commissars |
| Deputy1: | Isidor Barakhov |
| Year Deputy1: | 1923 - 1924 (first) |
| Deputy2: | Kliment Ivanov |
| Year Deputy2: | 1923 - 1924 (last) |
| Start: | 1922 |
| End: | 1991 |
The Yakut Autonomous Soviet Socialist Republic (ru|Якутская Автономная Советская Социалистическая Республика|Yakutskaya Avtonomnaya Sovetskaya Sotsialisticheskaya Respublika; sah|Саха автономнай сэбиэскэй социалистическэй республиката|Saxa avtonomnay sebieskey sotsialistiçeskey respublikata), also known as Soviet Sakha, Soviet Yakutia or the Yakut ASSR (ru|Якутская АССР|links=no, Yakutskaya ASSR), was an autonomous republic of the Russian SFSR within the Soviet Union.[1]
The Yakut ASSR was formed as part of the RSFSR on April 27, 1922, during the Yakut revolt. It comprised the territory of the Yakutsk Oblast, excluding the Nizhnyaya Tunguska district, which became part of the Kirensky district of the Irkutsk Governorate; the Republic also included the Khatango-Anabar district of the Yeniseysk Governorate, the Olekminsko-Suntarskaya volost of the Kirensky district of the Irkutsk Governorate and all the islands of the Arctic Ocean located between the meridians of 84° and 140½° east longitude.[2] It was transformed into the Sakha Republic in 1991.
Maksim Ammosov, together with Platon Oyunsky and Isidor Barakhov, played a major role in the formation of the Yakut Autonomous Republic. Ammosov served as the first Executive Secretary of the Yakut Communist Party, Oyunsky was the first Chairman of the Central Executive Committee, and Barakhov was the first Chairman of the Council of People's Commissars.[3]