Hesar-e Garmkhan (Persian: حصارگرمخان) 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. As a village, it was the capital of Baba Aman Rural District until its capital was transferred to the village of Baba Aman. Hesar-e Garmkhan was elevated to that status of a city in 2000.