Luan Da (died 112 BC; simplified Chinese: 栾大; traditional Chinese: 欒大; Pinyin: Luán Dà; Wade-Giles: Luan Ta) was a religious figure during the early Han Dynasty from the state of Yue. He professed to know the secret to immortality and be able to communicate with spiritual beings. Possessing the gift of gab and adept at confidence tricks, Luan Da gained the favour of Emperor Wu of Han, also known as Han Wudi. In the space of a few months, he rose from a commoner to great influence, holding titles and land, and marrying one of the emperor's daughters. However, he could not fulfill his promise to Emperor Wu, failing to produce a means to immortality. He gradually lost the emperor's favour and went on a purported visit to immortals; however, he was eventually captured and executed. At the apex of his career, many of his fellow mystics held him up as their role model and sought to emulate him. His death was a sign of the trade's fall from favour; laws were passed to restrict the practice of mediumship, even penalising those who married its practitioners.