Li Yun (李熅) (died 887), imperial princely title Prince of Xiang (襄王), was a pretender to the throne of the Tang dynasty, who briefly, under the support of the warlord Zhu Mei, claimed the Tang imperial throne for two months in 886–887 at the capital Chang'an, in competition with Emperor Xizong.
Tian Lingzi had Emperor Xizong issue an edict transferring Wang to Taining Circuit (泰寧, headquartered in modern Jining, Shandong).
In anger, Wang refused, and allied himself with the ethnic Shatuo military governor Li Keyong of Hedong Circuit (河東, headquartered in modern Taiyuan, Shanxi).
Tian reacted by aligning himself with Zhu Mei the military governor of Jingnan Circuit (靜難, headquartered in modern Xianyang, Shaanxi) and Li Changfu the military governor of Fengxiang Circuit (鳳翔, headquartered in modern Baoji, Shaanxi).
Xiao opposed, but Zhu ignored his opposition and forced the imperial officials who were at Fengxiang to submit a petition supporting Li Yun to take over the throne.
Initially, Emperor Xizong was to hold a grand celebration over Li Yun's death, but on the advice of the ceremonial scholar Yin Yingsun (殷盈孫), who pointed out that the death of an imperial clan member was not a good reason to celebrate, Emperor Xizong instead ordered Li Yun posthumously demoted to commoner rank and had the head buried.