Deputatsky (Russian: Депута́тский; Yakut: Депутатскай, romanized: Deputatskay) is an urban locality (an urban-type settlement) and the administrative center of Ust-Yansky District in the Sakha Republic, Russia, located in the Selennyakh Range, about 930 kilometers (580 mi) north-northeast of Yakutsk, the capital of the republic.

Due to the downturn in the mining industry following the dissolution of the Soviet Union, more than three-quarters of population left during the 1990s.

From there, a winter road (zimnik) leads through Batagay and the Verkhoyansk Range to Topolinoye, from where the Kolyma Highway is accessible.

An unmaintained winter road heads east from Deputatsky down the Uyandina Valley to Belaya Gora.

Winters are prolonged and bitterly cold, with up to seven months of sub-zero high temperatures, so that the soil remains permanently frozen.