Kashinsky District is an administrative and municipal district (raion), one of the thirty-six in Tver Oblast, Russia. It is located in the east of the oblast and borders with Kesovogorsky District in the north, Uglichsky District of Yaroslavl Oblast in the east, Kalyazinsky District in the southeast, Kimrsky District in the south, Rameshkovsky District in the west, and with Bezhetsky District in the northwest. The area of the district is . Its administrative center is the town of Kashin. Population: 27,410 (2010 Census); The population of Kashin accounts for 59.0% of the district's total population.