What was the name of C.S. Lewis’s final completed Narnia book?

The Last Battle was C.S. Lewis’s final completed Narnia book.

Published in 1956, The Last Battle concludes the seven-book Chronicles of Narnia. It is set during the final crisis of Narnia, when deception, political conflict, and the appearance of a false Aslan lead to the destruction of the old Narnian world. The novel then turns toward a renewed reality associated with Aslan’s country.

The book follows several recurring Narnian themes, including loyalty, false appearances, judgment, and the difference between genuine and counterfeit authority. It also brings back characters from earlier stories and gives the series a deliberately conclusive ending.

The title is sometimes confused with the final book in chronological reading order, but both publication and internal series lists identify The Last Battle as the conclusion. Lewis’s seven Narnia novels were published between 1950 and 1956. The Last Battle received the Carnegie Medal in 1957, one year after publication.