Demyansky District is an administrative and municipal district (raion), one of the twenty-one in Novgorod Oblast, Russia. It is located in the south of the oblast and borders with Krestetsky District in the north, Valdaysky District in the northeast, Firovsky District of Tver Oblast in the southeast, Ostashkovsky District of Tver Oblast in the south, Maryovsky District in the southwest, Starorussky District in the west, and with Parfinsky District in the northwest. The area of the district is . Its administrative center is the urban locality (a work settlement) of Demyansk. Population: 16,020 (2002 Census); The population of Demyansk accounts for 41.3% of the district's total population.