Li Zhen (李振) (died November 20, 923), courtesy name Xingxu (興緒), was an important official of the Chinese Five Dynasties and Ten Kingdoms period state Later Liang. He was a trusted aide of Later Liang's founding emperor Emperor Taizu (Zhu Quanzhong) before the founding of the Later Liang state, and later served as the director of imperial governance (崇政使, Chongzhengshi) during the reigns of Emperor Taizu's sons and successors Zhu Yougui and Zhu Zhen. After Later Liang was destroyed by its rival Later Tang, Later Tang's Emperor Zhuangzong put Li to death.
It is not known when Li Zhen was born. It is known that he was a great-grandson of the mid-Tang general Li Baozhen, and that his grandfather and father, whose names were lost to history, were both prefectural prefects. Li Zhen had submitted himself for imperial examinations in the Jinshi class several times during Emperor Yizong's Xiantong era (860-874) and Emperor Xizong's Qianfu era (874-879), but was unable to pass, and therefore developed a hatred for those officials who passed the Jinshi examinations. He was eventually able to obtain a commission as a general of the imperial guards, and was later commissioned as the prefect of Tai Prefecture (臺州, in modern Taizhou, Zhejiang). However, when he was reporting to the prefecture, the prefecture had become overrun by agrarian rebels, and he was unable to take office. As he headed back toward the imperial capital Chang'an, he went through Bian Prefecture (汴州, in modern Kaifeng, Henan), the capital of Xuanwu Circuit (宣武). He offered strategical advice to Zhu Quanzhong the military governor of Xuanwu; Zhu was impressed, and therefore kept Li at Xuanwu as an assistant to himself.