Liu Wu (Chinese: 劉悟) (died September 25, 825), formally the Prince of Pengcheng (彭城王), was a Chinese military general, monarch, and politician during the Tang Dynasty, whose killing of his superior, the warlord Li Shidao, and subsequent submission to the imperial government, were the high point of Emperor Xianzong's campaign to end warlordism. During the subsequent reign of Emperor Muzong, however, Liu, angered by a conspiracy between an imperial eunuch and one of his subordinates, drifted away from the imperial government and ruled Zhaoyi Circuit (昭義, headquartered in modern Changzhi, Shanxi) semi-independently.