The Pilgrim's Regress is a book of allegorical fiction by C. S. Lewis. This 1933 novel was Lewis's first published work of prose fiction, and his third piece of work to be published and first after he converted to Christianity. It charts the progress of a fictional character named John through a philosophical landscape in search of the Island of his desire. Lewis described the novel to his publisher as "a kind of Bunyan up to date," in reference to John Bunyan's 1678 novel The Pilgrim's Progress, recast with the politics, ideologies, philosophy, and aesthetic principles of the early 20th century. As such, the character struggles with the modern phoniness, hypocrisy, and intellectual vacancy of the Christian church, Communism, Fascism, and various philosophical and artistic movements.

Clive Staples Lewis was a British writer, literary scholar, and Anglican lay theologian. He held academic positions in English literature at both Magdalen College, Oxford (1925–1954), and Magdalene College, Cambridge (1954–1963). He is best known as the author of The Chronicles of Narnia, but he is also noted for his other works of fiction, such as The Screwtape Letters and The Space Trilogy, and for his non-fiction Christian apologetics, including Mere Christianity, Miracles, and The Problem of Pain.