Lucy Pevensie is a fictional character in C. S. Lewis's The Chronicles of Narnia series. She is the youngest of the four Pevensie children, and the first to find the Wardrobe entrance to Narnia in The Lion, the Witch and the Wardrobe. Of all the Pevensie children, Lucy is the closest to Aslan. Also, of all the humans who have visited Narnia, Lucy is perhaps the one that believes in Narnia the most. She is ultimately crowned Queen Lucy the Valiant, co-ruler of Narnia along with her two brothers and her sister. Lucy is the central character of the four siblings in the novels. Lucy is a principal character in three of the seven books, and a minor character in two others.

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.