| King Wucheng of Yan 燕武成王 | |
| Succession: | King of Yan |
| Reign: | 271–258 BC |
| Predecessor: | King Hui |
| Successor: | King Xiao |
| Full Name: | Ancestral name Jī (姬) |
| House: | Ji |
| Dynasty: | Yan |
| Posthumous Name: | King Wucheng (武成王) |
| Birth Date: | ? |
| Death Date: | 258 BC |
| Spouse: | A daughter of King Huiwen of Zhao |
| Issue: | King Xiao of Yan |
King Wucheng of Yan (; died 258 BC), personal name unknown, was a king of the Yan state. He ruled the kingdom between 271 BC until his death in 258 BC.[1]
In 272 BC, King Wucheng's father, King Hui, was murdered by the powerful chancellor Gongsun Cao (公孫操).[2] King Wucheng was crowned as the new Yan king. In the same year, Yan was attacked by a joint expedition of the forces of Han, Wei and Chu states. In 265 BC, Yan lost a battle against the troops of the Qi state led by Tian Dan.[3] King Wucheng died in 258 BC, and was succeeded by his son, King Xiao.[4] [1]