Li Siye (Chinese: 李嗣業; died March 2, 759[1]), posthumous name Prince Zhongyong of Wuwei (武威忠勇王), was a general of the Tang dynasty.
Li Siye later died from battle injuries whilst fighting against rebel forces during the An Lushan Rebellion.
In 748, when Gao Xianzhi, then the deputy military governor of Anxi, led an army against Lesser Bolü (小勃律, a city state centering modern Gilgit, Pakistan), then a vassal of the Tibetan Empire, Gao selected Li Siye and Tian Zhen (田珍) to serve as his deputies.
At Gao's direction, Li Siye and Tian launched a surprise attack on Suole by leading their soldiers through a path that involved climbing a cliff.
However, Duan Xiushi, also serving under Gao, rebuked Li Siye for advocating what effectively meant the abandonment of any straggling soldiers.
Li Siye was then the deputy military governor of Anxi, and he initially suggested to the jiedushi Liang Zai (梁宰) that they wait for more information.
He was made the commander of the expedition forces from Anxi and Beiting (北庭, headquartered in modern Changji Hui Autonomous Prefecture, Xinjiang).
Li Siye, seeing this situation, took off his upper clothing and rode on his horse, battering fleeing soldiers with his staff, to stop the panic.
For Li Siye contributions, he was made the minister of army supplies (衛尉卿, Weiwei Qing) and created the Duke of Guo.
However, when Tang forces launched a subsequent attack, when Li Siye heard the war drums being played, he yelled out in a loud voice, and suddenly, he bled profusely from his wound and died.