Lewis wrote that "The Narnian books are not as much allegory as supposal. Suppose there were a Narnian world and it, like ours, needed redemption. What kind of incarnation and Passion might Christ be supposed to undergo there?"
The main story is an allegory of Christ's crucifixion: Aslan sacrifices himself for Edmund, a traitor who may deserve death, in the same way that Christians believe Jesus sacrificed himself for sinners. Aslan is killed on the Stone Table, symbolizing Mosaic Law, which breaks when he is resurrected, symbolizing the replacement of the strict justice of Old Testament law with redeeming grace and forgiveness granted on the basis of substitutional atonement, according to Christian theology. As with the Christian Passion, it is women (Susan and Lucy) who tend Aslan's body after he dies and are the first to see him after his resurrection. The significance of the death contains elements of both the ransom theory of atonement and the satisfaction theory: Aslan suffers Edmund's penalty (satisfaction), and buys him back from the White Witch, who was entitled to him by reason of his treachery (ransom). In Christian belief, Christ is associated with the Biblical "Lion of Judah" of Revelation 5:5.
Professor Kirke is based on W.T. Kirkpatrick, who tutored a 16-year-old Lewis. "Kirk," as he was sometimes called, taught the young Lewis much about thinking and communicating clearly, skills that would be invaluable to him later.
Narnia is caught in endless winter that has lasted a century when the children first enter. Norse tradition mythologises a "great winter," known as the Fimbulwinter, said to precede Ragnarök. The trapping of Edmund by the White Witch is reminiscent of the seduction and imprisonment of Kay by The Snow Queen in Hans Christian Andersen's novella of that name.
The dwarves and giants are found in Norse mythology; fauns, centaurs, minotaurs and dryads derive from Greek mythology. Father Christmas, of course, was part of popular English folklore.
There are several parallels between the White Witch and the immortal white queen, Ayesha, of H. Rider Haggard's She, a novel greatly admired by C.S. Lewis.
The Story of the Amulet written by Edith Nesbit also contains scenes that can be considered precursors to sequences presenting Jadis, particularly in The Magician's Nephew. Nesbit's short story The Aunt and Amabel includes the motif of a girl entering a wardrobe to gain access to a magical place.
The freeing of Aslan's body from the stone table by field mice is reminiscent of Aesop's fable of "The Lion and the Mouse." In the fable, a lion catches a mouse, but the mouse persuades the lion to release him, promising that the favor would be rewarded. Later in the story, he gnaws through the lion's bonds after he has been captured by hunters. It is also reminiscent of a scene from Edgar Allan Poe's story "The Pit and the Pendulum," in which a prisoner is freed when rats gnaw through his bonds. In a later book, "Prince Caspian," we learn that as reward for their actions, mice gained the same intelligence and speech as other Narnian animals.