Menyuan Hui Autonomous County (, Xiao'erjing: ; ) is a county in the northeast of Qinghai Province, China, bordering Gansu Province to the north. It is under the administration of Haibei Tibetan Autonomous Prefecture. Menyuan is situated on the Datong River between the Qilian Mountains and Daban Mountains. Gangshiqia Peak rises dramatically in the north of the county. It used to be called Menyuan () in Chinese, with a different first character from the current name.
