Xu Wen (Chinese: 徐溫) (862 – November 20, 927), courtesy name Dunmei (敦美), formally Prince Zhongwu of Qi (齊忠武王), later further posthumously honored Emperor Wu (武皇帝) with the temple name Yizu (義祖) by his adoptive son Xu Zhigao after Xu Zhigao founded the state of Southern Tang, was a major general and regent of the Chinese Five Dynasties and Ten Kingdoms period state Wu. He took over the reins of the Wu state (then also known as Hongnong) after assassinating, with his colleague Zhang Hao, Yang Wo, the first Prince of Hongnong, and then killing Zhang. Xu was in essence the decision-maker throughout the reign of Yang Wo's brother and successor Yang Longyan and the first part of the reign of Yang Longyan's brother and successor Yang Pu. After his death, Xu Zhigao inherited his position as regen