Ust-Kuyga (; ) is an urban locality (an urban-type settlement) in Ust-Yansky District of the Sakha Republic, Russia. on the Yana River. As of the 2010 Census, its population was 979.
The settlement is located by the Kyundyulyun mountains, from Deputatsky, the administrative center of the district,
Urban-type settlement status was granted to Ust-Kuyga in 1967.
Within the framework of administrative divisions, the urban-type settlement of Ust-Kuyga is incorporated within Ust-Yansky District as the Settlement of Ust-Kuyga. As a municipal division, the Settlement of Ust-Kuyga is incorporated within Ust-Yansky Municipal District as Ust-Kuyga Urban Settlement.
Ust-Kuyga is served by the Ust-Kuyga Airport .