| Zhao Huan | |
| Succession: | Leader of Zhao clan |
| Reign: | 423 BCE - 409 BCE |
| Predecessor: | Zhao Jia (Zhao Huan-zi) |
| Successor: | Marquess Lie |
| Full Name: | Ancestral name Yíng (嬴) |
| Posthumous Name: | Xiàn (獻) Marquess Xiàn (獻侯) |
| Death Date: | 409 BCE |
| Father: | Zhao Zhou |
Marquess Xian of Zhao (died 409 BCE) or Zhao Xianzi was a ruler of the State of Zhao from 423 BCE to 409 BCE during the Warring States period of ancient China.
Born Zhào Huàn, he was the son of Zhao Zhou, grandson of Zhao Bolu and the eldest brother of Zhao Xiangzi (or Zhao Wuxu (Chinese: 趙毋卹)).
Zhào Xiāngzĭ believed that it was illegal for him to be the successor to Zhào Bólŭ and wanted to return his inheritance so that Zhào Huàn would become heir apparent.
After Zhào Huàn became leader he was banished from the Zhao capitals of Zhongmu County (in modern-day Henan) and Dai Commandery (near modern-day Yuzhou in Hebei) by Zhao Huanzi, who usurped Zhào Huàn's position and installed himself as ruler.
A year later, Zhào Huánzĭ died and the local people killed all his sons. As a result, Zhào Huàn once more became leader of Zhao. After he died he was awarded the posthumous title of Zhào Xiànzĭ whilst his son became Marquess Lie of Zhao who subsequently altered his father's posthumous title to Marquess Xian of Zhao.
Shen Changyun, “Zhao State Historical Manuscripts”, Zhonghua Publishing