Kuybyshevsky District () is an administrative and municipal district (raion), one of the forty-three in Rostov Oblast, Russia. It is located in the west of the oblast. The area of the district is . Its administrative center is the rural locality (a selo) of Kuybyshevo. Population: 14,800 (2010 Census); The population of Kuybyshevo accounts for 41.5% of the district's total population.