Colin Henry Wilson was an English existentialist philosopher-novelist. He also wrote widely on true crime, mysticism and the paranormal, eventually writing more than a hundred books. Wilson called his philosophy "new existentialism" or "phenomenological existentialism", and maintained his life work was "that of a philosopher, and (his) purpose to create a new and optimistic existentialism".

Existentialism is a form of philosophical inquiry that explores the issue of human existence. Existentialist philosophers explore questions related to the meaning, purpose, and value of human existence. Common concepts in existentialist thought include existential crisis, dread, and anxiety in the face of an absurd world and free will, as well as authenticity, courage, and virtue.