The Screwtape Letters is a Christian apologetic novel by C. S. Lewis and dedicated to J. R. R. Tolkien. It is written in a satirical, epistolary style and, while it is fictional in format, the plot and characters are used to address Christian theological issues, primarily those to do with temptation and resistance to it.

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.