Pilninsky District (Russian: Пи́льнинский райо́н) is an administrative and municipal district (raion), one of the forty-three in Nizhny Novgorod Oblast, Russia. It is located in the east of the oblast. The area of the district is 1,312.9 square kilometers (506.9 sq mi). Its administrative center is the urban locality (a work settlement) of Pilna. Population: 21,960 (2010 Census); 25,352 (2002 Census); 28,937 (1989 Census). The population of Pilna accounts for 33.4% of the district's total population.