Huidong County (; ) is a county in the far south of Sichuan Province, China. It is under the administration of the Liangshan Yi Autonomous Prefecture.
Huidong is located in southern Sichuan. It borders Huili to the west, Ningnan County to the north, and Qiaojia County, Dongchuan District and Luquan County, Yunnan across the Jinsha River to the south and east.
Huidong County comprises 2 subdistricts, 13 towns, and 4 townships.