| Viscount Huan of Wei 魏桓子 | |
| Succession: | Leader of Wei clan |
| Predecessor1: | Viscount Xiang |
| Successor1: | Marquess Wen |
| Full Name: | Ancestral name Jī (姬) |
| Posthumous Name: | Viscount Huan (桓子) or Viscount Xuan (宣子) |
| Death Date: | 446 BC |
| Father: | Viscount Xiang (Wei Manduo) |
| Issue: | Marquess Wen |
| House: | Ji |
Viscount Huan of Wei, personal name Wei Ju, was a leader of the Wei clan in the Jin state, where he served as dafu (大夫). He succeeded his father Wei Manduo (Viscount Xiang of Wei) as clan leader.
Together with Zhao Wuxu (Viscount Xiang of Zhao) and Han Hu (Viscount Kang of Han), Viscount Huan of Wei defeated Zhi Yao (Viscount Xiang of Zhi). Afterwards the three allies divided up the Zhi (知) territory and expanded their own state borders making them larger than the other states.
After Viscount Huan of Wei died, his son, Marquess Wen of Wei, became the Wei leader.