Li Xu was an officer of Wei during the Three Kingdoms period. An underling of Guanqiu Jian, with Shi Zhao he governed Huaibei. He initially joined Guanqiu Jian during his rebellion, but he quickly surrendered when a huge force of Wei troops under Sima Yi attacked, giving them the city. Seeing this, many other officers and men defected to Wei, depleting Wen Qin and Guanqiu Jian's forces considerably.