Benxi Manchu Autonomous County (simplified Chinese: 本溪满族自治县; traditional Chinese: 本溪滿族自治縣; pinyin: Běnxī Mǎnzú Zìzhìxiàn; Manchu: ᠪᡝᠨᠰᡳ ᠮᠠᠨᠵᡠ ᠪᡝᠶᡝ ᡩᠠᠰᠠᠩᡤᠠ ᠰᡳᠶᠠᠨ; Möllendorff: bensi manju beye dasangga siyan) is an autonomous county under the administration of the prefecture-level city of Benxi, in the east of Liaoning province, China. It has a total area of 3,362 square kilometres (1,298 sq mi), and a population of approximately 300,000 people as of 2002.

The city is home to a sizable Manchu and Hui population.

There is one subdistrict, 10 towns, and one townships within the county:

The only subdistrict is Guanyinge Subdistrict (观音阁街道).

10 towns are: Xiaoshi (小市镇), Caohezhang (草河掌镇), Caohecheng (草河城镇), Caohekou (草河口镇), Lianshanguan (连山关镇), Qinghecheng (清河城镇), Tianshifu (田师傅镇), Nandianzi (南甸子镇), Jianchang (碱厂镇), Pianling (偏岭镇), Gaoguan (高官镇).

The only township is Dongyingfang Township (东营房乡).