Samoylovsky District (Russian: Самойловский райо́н) is an administrative and municipal district (raion), one of the thirty-eight in Saratov Oblast, Russia. It is located in the west of the oblast. The area of the district is 2,500 square kilometers (970 sq mi). Its administrative center is the urban locality (a work settlement) of Samoylovka. Population: 21,451 (2010 Census); 25,979 (2002 Census); 26,125 (1989 Census). The population of Samoylovka accounts for 35.3% of the district's total population.