Korsakovsky District (Russian: Корса́ковский райо́н) is an administrative district (raion) of Sakhalin Oblast, Russia; one of the seventeen in the oblast.

[1] Municipally, it is incorporated as Korsakovsky Urban Okrug.

[4] It is located in the southeast of the oblast.

The area of the district is 2,623.6 square kilometers (1,013.0 sq mi).

[2] Its administrative center is the town of Korsakov.