Bare-Faced Messiah: The True Story of L. Ron Hubbard is a posthumous biography of Scientology founder L. Ron Hubbard by British journalist Russell Miller. First published in the United Kingdom on 26 October 1987, the book takes a critical perspective, challenging the Church of Scientology's account of Hubbard's life and work. It quotes extensively from official documents acquired using the Freedom of Information Act and from Hubbard's personal papers, which were obtained via a defector from Scientology. It was also published in Australia, Canada and the United States.

Scientology founder L. Ron Hubbard made a number of false claims about his life and background. His estranged son Ronald DeWolf (Nibs) reported that "Ninety-nine percent of what my father ever wrote or said about himself" was false. An acquaintance who knew Hubbard in Pasadena recalled recognizing Hubbard's epic autobiographical tales as being adapted from the writings of others. In October 1984, an American judge issued a ruling, writing of Hubbard that "The evidence portrays a man who has been virtually a pathological liar when it comes to his history, background and achievements."