Li Yun is a fictional character in Water Margin, one of the Four Great Classical Novels of Chinese literature.
As Zhu Fu has been his martial arts student, Li Yun, together with his men, unsuspectingly drinks the spiked wine he offers.
Then Zhu Fu interposes and convinces Li Yun to join Liangshan by emphasising to him that he has no other choice.
Li Yun is put in charge of building houses on Liangshan after the 108 Stars of Destiny came together in what is called the Grand Assembly.
He participates in the campaigns against the Liao invaders and rebel forces in Song territory following amnesty from Emperor Huizong for Liangshan.