Sherbakulsky District (Russian: Шербаку́льский райо́н) is an administrative and municipal district (raion), one of the thirty-two in Omsk Oblast, Russia. It is located in the southwest of the oblast on the border with Kazakhstan. The area of the district is 2,300 square kilometers (890 sq mi). Its administrative center is the urban locality (a work settlement) of Sherbakul. Population: 21,342 (2010 Census); 25,486 (2002 Census); 29,906 (1989 Census).