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 . Its administrative center is the rural locality (a selo) of Fershampenuaz. Population: 24,310 (2002 Census); The population of Fershampenuaz accounts for 20.9% of the district's total population.
The coat of arms and flag of Nagaybaksky District consists of two wheat stalks holding a sword on a blue field, symbolizing an agrarian population serving for the protection of other agrarians from nomads. The blue field symbolizes their Turkic steppe origin.