Zirkuh County (Persian: شهرستان زیرکوه) is a county in South Khorasan Province in Iran. The capital of the county is Hajjiabad. At the 2006 census, the county's population was 38,129, in 9,339 families. The county consists of two districts: Central District and Zohan District. The county has two cities: Hajjiabad and Zohan. The county was detached and formed from Qaen County in 2012.