Garmkhan District (Persian: بخش گرمخان) is a district (bakhsh) in Bojnord County, North Khorasan Province, Iran. At the 2006 census, its population was 28,259, in 6,676 families. The District has one city: Hesar-e Garmkhan. The District has two rural districts (dehestan): Garmkhan Rural District and Gifan Rural District.