The Outsider, 1956.
Religion & the Rebel, 1957.
Age of Defeat (US: Stature of Man), 1959.
Ritual on the Dark, 1960.
Encyclopaedia of Murder (with Pat Pitman), 1961.
Adrift in Soho, 1961.
The Strength to Dream, 1962.
Origins of the Sexual Impulse, 1963.
The World of Violence (US: The Violent World of Hugh Greene), 1963.
Man Without a Shadow (US: The Sex Diary of Gerard Sorme), 1963.
Rasputin & the Fall of the Romanovs, 1964.
Brandy of the Damned, 1964.
Necessary Doubt, 1964.
Beyond the Outsider, 1965.
Eagle & Earwig, 1965.
Sex & the Intelligent Teenager, 1966.
Introduction to the New Existentialism, 1966.
The Glass Cage, 1966.
The Mind Parasites, 1967.
Voyage to a Beginning, 1969.
A Casebook of Murder, 1969.
Bernard Shaw: A Reassessment, 1969.
The Philosopher's Stone, 1969.
L'amour: The Ways of Love, 1970.
The Return of the Lloigor, 1974.
The Strange Genius of David Lindsay (with E. H. Visiak & J. B. Pick) (US
abridged: The Haunted Man: The Strange Genius of David Lindsay), 1970.
Poetry & Mysticism (US abridged: Poetry & Mysticism), 1970.
Strindberg, 1970.
The God of the Labyrinth, 1970.
The Killer (US: Lingard), 1970.
The Occult, 1971.
The Black Room, 1971.
Order of Assassins, 1972.
New Pathways in Psychology, 1972.
Strange Powers, 1973.
"Tree" by Tolkien, 1973.
Hermann Hesse (US: Hesse, Reich, Borges), 1974.
Wilhelm Reich, 1974.
Jorge Luis Borges, 1974.
Ken Russell: A Director in Search of a Soul, 1974.
A Book of Booze, 1974.
The Schoolgirl Murder Case, 1974.
The Unexplained, 1975.
Mysterious Powers, 1975.
The Craft of the Novel, 1975.
Enigmas & Mysteries, 1975.
The Geller Phenomenon, 1975.
Men of Mystery (US: Dark Dimensions), 1977.
Mysteries, 1978.
Starseekers, 1980.
Science Fiction as Existentialism, 1980.
Frankenstein's Castle, 1980.
The Book of Time (editor), 1980.
The War Against Sleep, 1980.
The Directory of Possibilities (editor), 1981.
Poltergeist!, 1981.
Witches, 1981.
Anti-Sartre, 1981.
The Quest for Wilhelm Reich, 1982.
Access to Inner Worlds, 1983.
Encyclopedia of Modern Murder, 1983.
The Psychic Detectives, 1985.
A Criminal History of Mankind, 1984.
Lord of the Underworld, 1984.
The Janus Murder Case, 1984.
The Essential Colin Wilson, 1986.
The Bicameral Critic, 1985.
Rudolph Steiner, 1985.
Afterlife, 1985.
The Personality Surgeon, 1986.
An Encyclopedia of Scandal (with Donald Seaman), 1986.
The Book of Great Mysteries (with Christopher Evans), 1986.
An Essay on the New Existentialism, 1986.
The Laurel & Hardy Theory of Consciousness, 1986.
Spider World: The Tower, 1987.
Spider World: The Delta, 1987.
Marx Refuted (editor), 1987.
Aleister Crowley, 1987.
The Musician as Outsider, 1987.
Jack-the-Ripper: Summing Up & Verdict, 1987.
Autobiographical Reflections, 1988.
The Misfits, 1988.
Beyond the Occult, 1988.
The Mammoth Book of True Crime, 1988.
The Magician from Siberia, 1988.
The Decline & Fall of Leftism, 1989.
Written in Blood,1989.
Existentially Speaking, 1989.
Spider World: The Magician, 1992.
Strange Life of P. D. Ouspensky, 1993.
Unsolved Mysteries (with Damon Wilson), 1993.
From Atlantis to the Sphinx,
1996.
Atlas of Holy Places and Sacred Sites, 1997.
Alien Dawn, 1998.
The Devil's Party, a History of Charlatan Messiahs, (US: A History of Rogue
Messiahs), 2000.
Atlantis Blueprint, 2000.
Scandal (Update), 2003
Shadowlands (Spiderworld), 2003
Dreaming to Some Purpose, 2004