Oktyabrsky District (Russian: Октя́брьский райо́н; Kalmyk: Октябрин район, Oktyabrin rayon) is an administrative[1] and municipal[3] district (raion), one of the thirteen in the Republic of Kalmykia, Russia.

The area of the district is 3,680.58 square kilometers (1,421.08 sq mi).

[1] Its administrative center is the rural locality (a settlement) of Bolshoy Tsaryn.

[1] As of the 2010 Census, the total population of the district was 9,438, with the population of Bolshoy Tsaryn accounting for 58.2% of that number.

[1] Within the framework of administrative divisions, Oktyabrsky District is one of the thirteen in the Republic of Kalmykia.