Titus Groan is a novel by Mervyn Peake, first published in 1946. It is the first novel in the Gormenghast series.

Mervyn Laurence Peake was an English writer, artist, poet, and illustrator. He is best known for what are usually referred to as the Gormenghast books. The four works were part of what Peake conceived as a lengthy cycle, the completion of which was prevented by his death. They are sometimes compared to the work of his older contemporary J. R. R. Tolkien, but Peake's surreal fiction was influenced by his early love for Charles Dickens and Robert Louis Stevenson rather than Tolkien's studies of mythology and philology.