Yimen County () is a county in the central part of Yunnan Province, China. It is under the administration of the prefecture-level city of Yuxi.
Yimen borders Anning and Jinning District to the east, Eshan County to the south, Shuangbai County to the west, and Lufeng to the north.
Yimen County has 2 subdistricts, 1 town, 2 townships and 3 ethnic townships.