- _An Eye for an Eye_ (1922)
- _The Trail of the Shadow_ (1924)
- _The House of Intrigue_ (1925)
- _The Blue Horizon_ (1926)
- _The Brimming Cup_ (1928)
- _Challenge_ (1928)
- _The Starlit Pool_ (1930)
- _The Flame of Islam_ (1931)
- _The Uncharted Way_ (1932)
- _The Road to Endor_ (1933)
- _The Prince of Atlantis_ (1934)
- _The City Under the Sea_ (1936)
- _The Golden Reign_ (1938)
- _The Island of Horror_ (1940)
- _The Land of Mystery_ (1942)
- _The Valley of the Vanished_ (1944)
- _The World of Wonders_ (1946)
- _The Land of Enchantment_ (1948)
- _The Realm of the Impossible_ (1950)
Μη μυθοπλασία:
- _Outward Bound_ (1929)
- _Mysteries of the Orient_ (1931)
- _The Romance of Ancient Egypt_ (1934)
- _Travels in Arabia Deserta_ (1938)
- _Η Βίβλος υπό το φως της σύγχρονης επιστήμης_ (1941)
- _The Meaning of Life_ (1945)
- _In Search of God_ (1947)
- _The Nature of Reality_ (1949)
- _The Destiny of Man_ (1951)
- _The Future of the World_ (1953)
- _The Power of the Mind_ (1955)
- _The Unity of Knowledge_ (1957)
- _The Mystery of Matter_ (1959)
- _The Evolution of Consciousness_ (1961)
- _The Meaning of Evolution_ (1963)
- _The Problem of Evil_ (1965)
- _The Philosophy of Religion_ (1967)
- _The Nature of Man_ (1969)
- _The Future of Humanity_ (1971)
- _The Search for God_ (1973)
- _The Meaning of Death_ (1975)
- _The Unity of Life_ (1977)
- _The Nature of Reality_ (1979)
- _The Destiny of Man_ (1981)
- _The Future of the World_ (1983)
- _The Power of the Mind_ (1985)
- _The Unity of Knowledge_ (1987)
- _The Mystery of Matter_ (1989)
- _The Evolution of Consciousness_ (1991)
- _The Meaning of Evolution_ (1993)
- _The Problem of Evil_ (1995)
- _The Philosophy of Religion_ (1997)
- _The Nature of Man_ (1999)
- _The Future of Humanity_ (2001)
- _The Search for God_ (2003)
- _The Meaning of Death_ (2005)
- _The Unity of Life_ (2007)