Tselinsky District is an administrative and municipal district (raion), one of the forty-three in Rostov Oblast, Russia. It is located in the south of the oblast. The area of the district is 2,129 square kilometers (822 sq mi). Its administrative center is the rural locality of Tselina. Population: 33,690 ; 36,742 (2002 census); 34,666 (1989 Soviet census). The population of Tselina accounts for 31.6% of the district's total population.