Hesar-e Garmkhan (Persian: حصارگرمخان)[a] is a city in, and the capital of, Garmkhan District of Bojnord County, North Khorasan province, Iran.

It also serves as the administrative center for Garmkhan Rural District.

[4] As a village, it was the capital of Baba Aman Rural District[5] until its capital was transferred to the village of Baba Aman.

[6] At the time of the 2006 National Census, the city's population was 716 in 182 households.

[8] The 2016 census measured the population of the city as 1,499 people in 403 households.