Morozovsk (Russian: Моро́зовск) is a town and the administrative center of Morozovsky District of Rostov Oblast, Russia, located on the Bystraya River (left tributary of the Seversky Donets), 265 kilometers (165 mi) northeast of Rostov-on-Don. Population: 27,644 (2010 Census preliminary results); 29,222 (2002 Census); 27,004 (1989 Census).