Ust-Kuyga (Russian: Усть-Куйга́; Yakut: Уус Куйга, romanized: Uus Kuyga) is an urban locality (an urban-type settlement) in Ust-Yansky District of the Sakha Republic, Russia.

[3] The settlement is located by the Kyundyulyun mountains, 224 kilometers (139 mi) from Deputatsky, the administrative center of the district,[2] Urban-type settlement status was granted to Ust-Kuyga in 1967.

[2] Within the framework of administrative divisions, the urban-type settlement of Ust-Kuyga[1] is incorporated within Ust-Yansky District as the Settlement of Ust-Kuyga.

[2] As a municipal division, the Settlement of Ust-Kuyga is incorporated within Ust-Yansky Municipal District as Ust-Kuyga Urban Settlement.

[4] Ust-Kuyga is served by the Ust-Kuyga Airport (IATA: UKG).