John Marc DeMatteis (born December 15, 1953) is an American comic book writer. He has had successful runs on Doctor Fate, Superman and Justice League of America, as well as several Captain America and Spider-Man titles for Marvel. His best known work is his partnership with Keith Giffen on Justice League International and its spin-offs, Super Buddies and I Can't Believe It's Not the Justice League.
- "For the Man Who Has Everything" (writer)
- "The Return" (writer)
- "Ultimatum" (writer)
- "The Ties That Bind" (teleplay)
- "Clash" (writer)
- "Shadow of the Hawk" (writer)
- "Grudge Match" (writer)