The Horse and His Boy is a novel for children by C. S. Lewis, published by Geoffrey Bles in 1954. Of the seven novels that comprise The Chronicles of Narnia (1950–1956), The Horse and His Boy was the fifth to be published. The novel is set in the period covered by the last chapter of The Lion, the Witch, and the Wardrobe during the reign of the four Pevensie children as Kings and Queens of Narnia. Though three of the Pevensies appear as minor characters in The Horse and His Boy, the main characters are two children and two talking horses who escape from Calormen and travel north into Narnia. On their journey, they learn of the Prince of Calormen's plan to attack Archenland, and warn the King of Archenland of the impending strike.
Like the other novels in The Chronicles of Narnia, The Horse and His Boy was illustrated by Pauline Baynes; her work has been retained in many later editions.