Kaslinsky District () is an administrative and municipal district (raion), one of the twenty-seven in Chelyabinsk Oblast, Russia. It is located in the north of the oblast. The area of the district is . Its administrative center is the town of Kasli. Population (excluding the administrative center): 14,955 (2002 Census);
Within the framework of administrative divisions, it has a status of a town with territorial districtâÂÂa unit equal in status to administrative districtsâÂÂthe full name of which is The Town of Kasli and Kaslinsky District (). As a municipal division, it is incorporated as Kaslinsky Municipal District.