Francis Israel Regardie 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.

The occult is a category of esoteric or supernatural beliefs and practices which generally fall outside the scope of organized religion and science, encompassing phenomena involving a 'hidden' or 'secret' agency, such as magic and mysticism. It can also refer to supernatural ideas like extra-sensory perception and parapsychology.