John Wesley Dennis (May 16, 1903 – September 3, 1966) was an American illustrator, known best for fifteen children's books about horses that he created in collaboration with writer Marguerite Henry. He illustrated over 150 books in his lifetime, including Anna Sewell's Black Beauty and John Steinbeck's The Red Pony. He also wrote and illustrated a few books of his own, among which are Flip, Flip and the Cows, Flip and the Morning, and Tumble.