Prequel Oz is a term that can describe Oz books and films that take place before the timeline of The Wonderful Wizard of Oz. They tend to be mostly origin stories about the good and bad Witches along with the Wizard. They tend to have elements that also allow them to fit in the category of alternate Oz, but for the most part, they try to be consistant with L. Frank Baum's version of Oz.
- Wicked: The Life and Times of the Wicked Witch of the West, the musical and upcoming film.
- How the Wizard Came to Oz and its upcoming film
- Gabriel Gale's Ages of Oz
- The Hidden History of Oz
- Lion of Oz and the Badge of Courage and its film
- Oz the Great and Powerful