Petrovka () is a rural locality (a selo), the only inhabited locality, and the administrative center of Kharansky Rural Okrug of Megino-Kangalassky District in the Sakha Republic, Russia, located from Nizhny Bestyakh, the administrative center of the district. Its population as of the 2010 Census was 1,139, of whom 520 were male and 619 female, up from 1,068 as recorded during the 2002 Census.