Qi County or Qixian (simplified Chinese: 杞县; traditional Chinese: 杞縣; pinyin: Qǐ Xiàn) is a county of Kaifeng, Henan, People's Republic of China, with an area of 1243 square km and a population of 1.05 million.

In Qin dynasty, Qi was named as Yongqiu (Chinese: 雍丘).

In the Song dynasty, Yongqiu was renamed to Qi.

Cai Wenji, a Han dynasty poet and composer, was born shortly before 178 in Yu Prefecture (圉縣), Chenliu Commandery (陳留), in what is now Qi County, Kaifeng, Henan.

Qi County has 8 towns and 13 townships.