Peter J. Tomasi is an American comic book editor and writer, best known for his work for DC Comics. As an editor, he oversaw numerous books featuring the Justice League, including books starring various members of that team, such as Batman, Aquaman, Martian Manhunter, Green Lantern and the Flash. As a writer, he has written books featuring Batman-related characters, such as Batman and Robin and The Outsiders, and Green Lantern-related books such as "Blackest Night", Brightest Day and Green Lantern: Emerald Warriors.