Yefremovo () is a rural locality (a selo), one of two settlements, in addition to Onnyos and Tegyulte, in Amgino-Nakharinsky Rural Okrug of Aldansky District in the Sakha Republic, Russia. It is located from Amga, the administrative center of the district and from Onnyos, the centre of the settlement. Its population as of the 2010 Census was 29; up from 23 recorded in the 2002 Census.