Ust-Omchug () is an urban locality (an urban-type settlement) and the administrative center of Tenkinsky District of Magadan Oblast, Russia, located at the mark of the highway to the northwest of Magadan. Population:
Urban-type settlement status was granted to Ust-Omchug in 1953.
Some north from the settlement there are couple of other abandoned settlements that once were part of the TenLag. They are Butugichag and Lower Butugichag. The settlements were part of the Soviet correctional system of GULAG.
There is an ore-mining and processing plant, a mining equipment repair shop, a timber industry company, and a poultry farming sovkhoz.
Ust-Omchug has a very cold subarctic climate (Köppen climate classification Dfc). Winters are prolonged and very cold, with up to eight months of sub-zero maximum daily temperatures, such that the soil remains permanently frozen. Permafrost and tundra cover most of the region. Average temperatures range from in January to in July.
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