Oy (; ) is a rural locality (a selo), the only inhabited locality, and the administrative center of Nemyuginsky Rural Okrug of Khangalassky District in the Sakha Republic, Russia, located from Pokrovsk, the administrative center of the district. Its population numbered 2,302 per 2021 census, up from the 2010 Census, where the population was 2,266, but down from 2,305 recorded during the 2002 Census.