Paul Iselin Wellman (October 15, 1895 — September 17, 1966) was an American journalist, popular history and novel writer, and screenwriter, known for his books of the Wild West: Kansas, Oklahoma, Great Plains. Hollywood movies Cheyenne, The Walls of Jericho, Jubal, Apache, The Comancheros, and The Iron Mistress are based on Wellman novels. Wellman's brother, Manly Wade Wellman, was also a well published author, as was his father, Frederick Creighton Wellman under the pseudonym Cyril Kay-Scott. Another brother, Frederick Lovejoy Wellman, was a noted plant pathologist.