The Horse and His Boy is a fantasy 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.

The Chronicles of Narnia is a series of seven portal fantasy novels by British author C. S. Lewis. Illustrated by Pauline Baynes and originally published between 1950 and 1956, the series is set in the fictional realm of Narnia, a fantasy world of magic, mythical beasts and talking animals. It narrates the adventures of various children who play central roles in the unfolding history of the Narnian world. Except in The Horse and His Boy, the protagonists are all children from the real world who are magically transported to Narnia, where they are sometimes called upon by the lion Aslan to protect Narnia from evil. The books span the entire history of Narnia, from its creation in The Magician's Nephew to its eventual destruction in The Last Battle.