Liu Zhijun (Chinese: 劉知俊; died January 21, 918?), courtesy name Xixian (希賢), nicknamed Liu Kaidao (劉開道, "Liu who opened the way"), was a general under Zhu Wen (Zhu Quanzhong) while Emperor Taizu was a major warlord during the late Tang Dynasty and then during Emperor Taizu's reign in his new Later Liang. Later, fearing that Emperor Taizu was going to act against him, he defected, first to Qi, then to Former Shu. Former Shu's emperor Wang Jian (Emperor Gaozu), however, also was apprehensive of his talent and later had him executed.
It is not known when Liu Zhijun was born, but it is known that he was from Pei County. It was said that he had a handsome appearance and had great ambitions. He initially served under Shi Pu the military governor (Jiedushi) of Ganhua Circuit (感化, headquartered in modern Xuzhou, Jiangsu), and was highly regarded by Shi. However, his bravery and good use of tactics eventually caused Shi to be apprehensive of him. Around the new year 892, he submitted to Zhu Quanzhong the military governor of Xuanwu Circuit (宣武, headquartered in modern Kaifeng, Henan), who was then engaged in a lengthy campaign against Shi. It was said that Liu's surrender to Zhu was a big blow to the Ganhua army, which from that point on was no longer able to stand up against Xuanwu. (Ganhua's capital Xu Prefecture (徐州) would eventually fall to Zhu's army in 893, and Shi committed suicide.) Zhu put the two Yisheng armies (義勝軍) under Liu's command, and made him "Kaidao Commander" (開道指揮使, "the commander who opens the way"), thus leading to Liu's receiving the nickname of "Liu Kaidao." He later successively served as the prefect of Hai Prefecture (海州, in modern Lianyungang, Jiangsu), Huai Prefecture (懷州, in modern Jiaozuo, Henan), and Zheng Prefecture (鄭州, in modern Zhengzhou, Henan).