Krasnosulinsky District (Russian: Красносули́нский райо́н) is an administrative[1] and municipal[5] district (raion), one of the forty-three in Rostov Oblast, Russia.

It is located in the west of the oblast.

The area of the district is 2,104 square kilometers (812 sq mi).

[2] Its administrative center is the town of Krasny Sulin.

[8] The population of Krasny Sulin accounts for 49.9% of the district's total population.