The Wizard of Oz is an American musical movie. It was produced by MGM and released by RKO in 1939. The movie is based on the children's book "The Wonderful Wizard of Oz" by L. Frank Baum. This book was first published in May 1900. The book and movie are about a little girl's adventures in the land called Oz. This is still watched from 1939 to 2017.