Nelidovsky District (Russian: Нели́довский райо́н) is an administrative and municipal district (raion), one of the thirty-six in Tver Oblast, Russia. It is located in the southwest of the oblast and borders with Andreapolsky District in the north, Selizharovsky District in the northeast, Oleninsky District in the east, Belsky District in the south, Zharkovsky District in the southwest, and with Zapadnodvinsky District in the west. The area of the district is 2,632 square kilometers (1,016 sq mi). Its administrative center is the town of Nelidovo. Population: 30,731 (2010 Census); 9,144 (2002 Census); 11,829 (1989 Census). The population of Nelidovo accounts for 74.5% of the district's total population.