Kalyazin (Russian: Каля́зин) is a town and the administrative center of Kalyazinsky District of Tver Oblast, Russia, located on the Volga River, 25 kilometers (16 mi) southeast of Kashin, 110 kilometers (68 mi) north of Sergiyev Posad, and 55 kilometers (34 mi) southwest of Uglich (by highway). Population: 13,867 (2010 Census); 14,820 (2002 Census); 15,544 (1989 Census).
Kalyazin appeared in the 12th century as a sloboda (a settlement for people relieved from paying taxes). The town’s importance grew significantly with the foundation of the Makaryevsky Monastery on the opposite bank of the Volga in the 15th century. This abbey used to be the most conspicuous landmark of Kalyazin and comprised numerous buildings of historic interest, including a refectory from 1525.
In 1940, the monastery and most of the old town were flooded during the construction of the Uglich Hydroelectric Station, which created the Uglich Reservoir. After that, the town was effectively relocated to a new, higher spot.
On November 19, 2001, a chartered IRS Aero Ilyushin Il-18 airplane crashed in Kalyazin, Russia killing all twenty-seven on board.
On August 26, 2010, dozens of Central Asian guest workers were deported from the town after mass clashes with the locals. Their construction site jobs were given to locals instead.