The Children of Llyr is a fantasy novel by American writer Evangeline Walton, the second in a series of four based on the Welsh Mabinogion. It was first published in paperback by Ballantine Books as the thirty-third volume of the Ballantine Adult Fantasy series in August, 1971. It has been reprinted a number of times since, and gathered together with Walton's other Mabinogion novels by Overlook Press as the omnibus The Mabinogion Tetralogy in 2002. The novel has also been published in translation in several European languages. The other three novels in the series are The Island of the Mighty (1936), The Song of Rhiannon (1972), and Prince of Annwn (1974).