Florence Ryerson (20 September 1892 – 8 June 1965) was one of the screenwriters who worked on the script of the 1939 MGM film The Wizard of Oz. She and Edgar Allan Woolf worked as a screenwriting team in Hollywood during the 1930s; they wrote scripts for ten films during that decade. They were called in to re-write Noel Langley's script for the Oz film in the summer of 1938; some of their changes were preserved in the final version of the movie — most notably, perhaps, their "There's no place like home" ending. The idea of multiple roles for the actor playing the Wizard was also a Ryerson/Woolf inspiration. They created Professor Marvel as the Kansas equivalent of the Wizard, and named the good witch of the north Glinda.