Kalininsky District is an administrative and municipal district (raion), one of the thirty-six in Tver Oblast, Russia. It is located in the south of the oblast and borders with Likhoslavlsky District in the north, Rameshkovsky District in the northeast, Kimrsky District in the east, Konakovsky District in the southeast, Lotoshinsky District of Moscow Oblast in the south, Staritsky District in the southwest, and with Torzhoksky District in the west. The area of the district is 4,244.7 square kilometers (1,638.9 sq mi). Its administrative center is the city of Tver. Population: 52,047 ; 54,857 (2002 Census); 58,330 (1989 Soviet census).

Tver is a city and the administrative centre of Tver Oblast, Russia. It is situated at the confluence of the Volga and Tvertsa rivers. Tver is located 180 kilometres (110 mi) northwest of Moscow. Population: 416,216 (2021 Census).