Krasnoarmeysky District () is an administrative and municipal district (raion), one of the twenty-seven in Chelyabinsk Oblast, Russia. It is located in the northeast of the oblast. The area of the district is . Its administrative center is the rural locality (a selo) of Miasskoye. Population: 43,553 (2002 Census); The population of Miasskoye accounts for 23.4% of the district's total population.