The Outsider is a non-fiction book by Colin Wilson first published in 1956.

Through the works and lives of various artists - including H. G. Wells (Mind at the End of its Tether), Franz Kafka, Albert Camus, Jean-Paul Sartre, T. S. Eliot, Ernest Hemingway, Harley Granville-Barker (The Secret Life), Herman Hesse, T. E. Lawrence, Vincent Van Gogh, Vaslav Nijinsky, George Bernard Shaw, William Blake, Friedrich Nietzsche, Fyodor Dostoevsky and G. I. Gurdjieff - Wilson explores the psyche of the Outsider, his effect on society, and society's effect on him.