Francis Israel Regardie (/rɪˈɡɑːrdi/; né Regudy; November 17, 1907 – March 10, 1985) was an English and American occultist, ceremonial magician, and writer who spent much of his life in the United States. He wrote fifteen books on the subject of occultism.
Born to a working-class Orthodox Jewish family in the East End of London, Regardie and his family soon moved to Washington, D.C., in the United States. Regardie rejected Orthodox Judaism during his teenage years and took an interest in Theosophy, Hinduism, Buddhism, and Jewish mysticism. It was through his interest in yoga that he encountered the writings of the occultist Aleister Crowley. Contacting Crowley, he was invited to serve as the occultist's secretary, necessitating a move to Paris, France in 1928. He followed Crowley to England before their association ended. Living in England, he wrote two books on the Qabalah, A Garden of Pomegranates and The Tree of Life. In 1934 he then joined the Stella Matutina—a ceremonial magic order descended from the defunct Hermetic Order of the Golden Dawn—but grew dissatisfied with its leadership and left. He also studied psychology, being particularly influenced by ideas from Jungian psychology, and explored Christian mysticism.