Liu Rengong (Chinese: 劉仁恭) (died 914) was a warlord late in the Chinese Tang dynasty who controlled Lulong Circuit (盧龍, headquartered in modern Beijing) from 895 (when his one-time lord Li Keyong conquered Lulong and left him in charge of it) to 907 (when he was overthrown by his son Liu Shouguang and put under house arrest). He was initially a Lulong officer, but later fled to Li Keyong's Hedong Circuit (河東, headquartered in modern Taiyuan, Shanxi). After Li conquered Lulong and left him in charge, he turned against Li and became an independent warlord, although at times he and Li would still act in concert. His domain later became the basis of the Five Dynasties and Ten Kingdoms period state Yan that Liu Shouguang established. In 913, however, Li Keyong's son and successor Li Cunxu the Prince of Jin conquered Yan and captured both Liu Shouguang and Liu Rengong; he put them to death the next year.