Ust-Donetsky District () is an administrative and municipal district (raion), one of the forty-three in Rostov Oblast, Russia. It is located in the center of the oblast. The area of the district is . Its administrative center is the urban locality (a work settlement) of Ust-Donetsky. Population: 33,647 (2010 Census); The population of the administrative center accounts for 35.1% of the district's total population.