Krasny Sulin is a town located in the Rostov Oblast of Russia. It serves as the administrative center of the Krasnosulinsky District and is situated within the Donets Basin region.
According to census data, the population of the town has fluctuated over recent decades. The 2010 census recorded a population of 40,866, following figures of 44,187 in 2002 and 43,133 during the 1989 Soviet census.