Li Tieguai is a Chinese mythological figure and one of the Eight Immortals in the Taoist pantheon. He is sometimes described as irascible and ill-tempered, but also benevolent to the poor, sick and the needy, whose suffering he alleviates with special medicine from his bottle gourd. He is often portrayed as an ugly old man with a dirty face, a scraggly beard, and messy hair held by a golden band. He walks with the aid of an iron crutch and often has a gourd slung over his shoulder or held in his hand. He often is depicted as a clown figure who descends to earth in the form of a beggar who uses his power to fight for the oppressed and needy, and to heal others.

The Eight Immortals are a group of legendary xian (immortals) in Chinese mythology. Each immortal's power can be transferred to a vessel (法器) that can bestow life or destroy evil. Together, these eight vessels are called the "Covert Eight Immortals" (暗八仙). Most of them are said to have been born in the Tang or Song Dynasty. They are revered by the Taoists and are also a popular element in secular Chinese culture. They are said to live on a group of five islands in the Bohai Sea, which includes Mount Penglai.