Dongfang Bubai, literally "Invincible East", is a fictional character in the wuxia novel The Smiling, Proud Wanderer by Jin Yong. He is the leader of the Sun Moon Holy Cult (日月神教), an "unorthodox" martial arts school. In his quest to dominate the wulin, he castrated himself to fulfil the prerequisite for learning the skills in a martial arts manual known as the Sunflower Manual (葵花寶典), and became a formidable martial artist after mastering those skills. His castration and supreme prowess in martial arts make him one of the most memorable characters in Jin Yong's wuxia universe even though he appears in only one chapter of the novel. His name has also become virtually synonymous with homosexuality and LGBT sexual orientations in Chinese popular culture.

The Smiling, Proud Wanderer is a wuxia novel by Jin Yong. It was first serialised in Hong Kong in the newspaper Ming Pao from 20 April 1967 to 12 October 1969. The Chinese title of the novel, Xiao Ao Jiang Hu, literally means to live a carefree life in a mundane world of strife. Alternate English translations of the title include The Wandering Swordsman, Laughing in the Wind, The Peerless Gallant Errant, and The Proud and Gallant Wanderer. Another alternative title, State of Divinity, is used for some of the novel's adaptations.