Kalyazin (Russian: Каля́зин) is a town and the administrative center of Kalyazinsky District in Tver Oblast, Russia, located on the right bank of the Volga River, 175 kilometers (109 mi) northeast of Tver, the administrative center of the oblast. Population: 13,867 (2010 Census); 14,820 (2002 Census); 15,544 (1989 Census).