Matthew John Costello (born 1948) is an American writer specializing in the genres of horror, gothic, and science fiction.
Along with F. Paul Wilson, Costello created and scripted FTL Newsfeed, which ran daily on the Sci-Fi Channel from 1992 to 1996.
Costello also wrote Island of the Skull (Pocket Books), an original prequel to Peter Jackson's film, King Kong.
His works include the book series The Kids of Einstein Elementary (Scholastic), and Magic Everywhere (Random House), as well as games including Aladdin's Mathquest (Disney), A Cartoon History of the Universe (Putnam), and two math games based on the hit PBS Kids show Cyberchase.
He is the designer of role-playing and board games, including Dungeons & Dragons, Call of Cthulhu, Batman, Lone Wolf & Cub, and many others.