Oktyabrsky District () is an administrative and municipal district, (raion), one of the forty-three in Rostov Oblast, Russia. It is located in the western central part of the oblast. The area of the district is . Its administrative center is the urban locality (a work settlement) of Kamenolomni. Population: 73,224 (2010 Census); The population of Kamenolomni accounts for 15.4% of the district's total population.