Lawrence LeShan (born September 6, 1920) is an American psychologist, educator and the author of the best-selling How to Meditate (1974), one of the first practical guides to meditation. He has authored or co-authored approximately 75 articles in the professional literature and thirteen books on a diverse range of topics including psychotherapy, war, cancer treatment, and mysticism. He has also written science fiction under the pseudonym Edward Grendon.
In the 1960s and 1970s, LeShan conducted extensive research in the field of parapsychology. In books The Medium, the Mystic, and the Physicist and Alternate Realities, he investigated similarities between quantum mechanics and mystical thought. In World of the Paranormal: The Next Frontier, LeShan advanced these ideas further, claiming that psychic abilities such as telepathy, clairvoyance, and precognition can be explained using quantum theory. While shared by many in the New Thought movement, LeShan's ideas have been criticized by skeptics as "quantum pseudo-mysticism."
In the 1980s, LeShan's focus shifted to the psychotherapy of cancer support, a field in which he is considered a pioneer. LeShan lives in New York City.
LeShan was married to the late Eda LeShan, who was also a writer.