Kaslinsky District (Russian: Ка́слинский райо́н) is an administrative and municipal district (raion), one of the twenty-seven in Chelyabinsk Oblast, Russia.

[1] It is located in the north of the oblast.

The area of the district is 3,356 square kilometers (1,296 sq mi).

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

[7] Within the framework of administrative divisions, it has a status of a town with territorial district—a unit equal in status to administrative districts—the full name of which is The Town of Kasli and Kaslinsky District (город Касли и Каслинский район).