Qimen County (simplified Chinese: 祁门县; traditional Chinese: 祁門縣; pinyin: Qímén Xiàn; alternately romanized as Keemun) is a county in the southeast of Anhui Province, China, bordering Jiangxi Province to the southwest.

Qimen County was established in 766 during the Tang dynasty (Yongtai Era 2).

It takes its name from the Mount Qi in the northeast and the Chang River (阊江) in the southwest.

[citation needed] The headquarters of the Xiang Army were in Qimen during part of the Taiping Rebellion.

The area around the border with Shitai County contains a National Nature Reserve.