Zhu Bajie, also named Zhu Wuneng, is one of the three helpers of Xuanzang in the classic Chinese novel Journey to the West. He is called "Pigsy" or "Pig" in many English versions of the story.

Zhu Bajie is a complex and developed character in the novel. He looks like a terrible monster, part human and part pig, who often gets himself and his companions into trouble by his laziness, his gluttony, and his propensity for lusting after pretty women. He is jealous of Wukong and always tries to bring him down. His Buddhist name "Zhu Wuneng", given by bodhisattva Guanyin, means "pig (reincarnate) who is aware of ability, or pig who rises to power", a reference to the fact that he values himself so much as to forget his own grisly appearance. Xuanzang gave him the nickname Bājiè which means "eight restraints, or eight commandments" to remind him of his Buddhist diet. He is often seen as the most outgoing of the group. In the original Chinese novel, he is often called dāizi (呆子), meaning "idiot". Sun Wukong, Xuanzang and even the author refer to him as "idiot" over the course of the story. Bodhisattvas and other heavenly beings usually refer to him as "Heavenly Tumbleweed."