Spassky District is a territorial administrative unit and municipal district of the Republic of Tatarstan within the Russian Federation. The total area of the district is 2028 km². It is located in the southwestern part of Tatarstan. The administrative center is Bolgar. As of 2020, the population estimated at 18,599 residents.

Bolgar is a town and the administrative center of Spassky District in the Republic of Tatarstan, Russia, located on the left bank of the Volga River, 140 kilometers (87 mi) from Kazan. As of the 2010 Census, its population was 8,650.