 Ostashkovsky District

Ostashkovsky District () is an administrative and municipal district (raion), one of the thirty-six in Tver Oblast, Russia.It is located in the northwest of the oblast and borders with Demyansky District of Novgorod Oblast in the north, Firovsky District in the northwest, Kuvshinovsky District in the east, Selizharovsky District in the south, Penovsky District in the southwest, and with Maryovsky District of Novgorod Oblast in the west.