Buryatia, officially the Republic of Buryatia, is a republic of Russia located in the Russian Far East. Formerly part of the Siberian Federal District, it has been administered as part of the Far Eastern Federal District since 2018. It borders Irkutsk Oblast and Lake Baikal, the deepest lake in the world to the north, Zabaykalsky Krai to the east, Tuva to the west and Mongolia to the south. Its capital is the city of Ulan-Ude. It has an area of 351,300 square kilometers (135,600 sq mi) with a population of 978,588. It is home to the indigenous Buryats.

Buryat or Buriat, known in foreign sources as the Bargu-Buryat dialect of Mongolian, and in pre-1956 Soviet sources as Buryat-Mongolian, is a variety of the Mongolic languages spoken by the Buryats and Bargas that is classified either as a language or major dialect group of Mongolian.