Was the movie Labyrinth with David Bowie based on a book?

Yes, the movie Labyrinth was based on a children's book by Dennis Lee, entitled "Labyrinth: The Story of Sarah and the Goblin King". The novel and the film share a number of similarities, but also contain notable differences. For example, the novel features numerous fantastical creatures that are not present in the film, such as a talking fox and a giant snail. Additionally, the film's ending differs significantly from the book's conclusion.