Nain County (Persian: شهرستان نائین‎‎) is a county in Isfahan Province in Iran. The capital of the county is Nain. At the 2006 census, the county's population (including the portions of the county that were later split off to form Khur and Biabanak County) was 54,298, in 15,919 families; excluding those portions, the population was 36,810 in 10,995 families. The county is subdivided into two districts: the Central District and Anarak District. The county has two cities: Nain and Anarak.