Nagaybaksky District is an administrative and municipal district (raion), one of the twenty-seven in Chelyabinsk Oblast, Russia. It is located in the south of the oblast. The area of the district is 3,022 square kilometers (1,167 sq mi). Its administrative center is the rural locality of Fershampenuaz. Population: 20,927 (2010 Census); 24,310 ; 25,959 (1989 Soviet census). The population of Fershampenuaz accounts for 20.9% of the district's total population.