Kiznersky District (; , Kizner joros) is an administrative and municipal district (raion), one of the twenty-five in the Udmurt Republic, Russia. It is located in the southwest of the republic. The area of the district is . Its administrative center is the rural locality (a settlement) of Kizner. Population: 23,502 (2002 Census); The population of Kizner accounts for 47.1% of the district's total population.
Major rivers in the district include the Vyatka, the Kazanka, the Pyzhmanka, the Lyuga, and the Umyak.
Ethnic composition (according to the 2002 Census):
District's economy is based on agriculture.