Wu Rui (died 202 BC), King Wen of Changsha, was an ancient Chinese general and rebel leader who helped Liu Bang establish the Han dynasty.

He enjoyed high popularity and prestige among the local Baiyue people and was known as "Lord of the Po" (番君).

Wu Rui's followers included Mei Xuan (梅鋗, Méi Xuān) and his son-in-law Ying Bu, both of whom assisted Liu Bang and played a major role in his victory against Qin and Xiang Yu.

Wu Rui died shortly after reaching Linxiang (present-day Changsha), the capital of his new fief.

In the early Three Kingdoms period, Wu Rui's tomb was demolished to provide the source of wood for a new temple for Sun Jian.