Karkheh County () is in Khuzestan province, Iran. Its capital is the city of Alvan, whose population at the time of the 2016 National Census was 6,860 in 1,824 households.
In 2019, Shavur District was separated from Shush County in the establishment of Karkheh County, which was divided into two districts of two rural districts each, with Alvan as its capital.
Karkheh County's administrative structure is shown in the following table.