John D. Dunning (May 5, 1916 – February 25, 1991) was an American film editor who worked on several large-scale Hollywood movies from 1947 to 1970. He was an editor contracted to MGM Studios. While working with MGM, Dunning was picked by the famed director Frank Capra to collorabate with him on a World War II series of seven patriotic films for the American public, collectively called Why We Fight, produced from 1942 to 1945. This early relation with Capra honed his skills with a talented director and brought him to the professional recognition in the film world.