Justin Hammer is a fictional character appearing in American comic books published by Marvel Comics. The character is depicted as a villainous entrepreneur, head of Hammer Industries and a frequent adversary of the superhero Iron Man. As he explains in his first major appearance, he is the reason why many of Iron Man's supervillain enemies have access to extremely advanced technology and why these foes use their equipment for violent crimes instead of profiting by bringing the designs to market. Hammer reveals that the villains are his underworld mercenaries, secretly armed and contractually obliged to fulfill missions against Hammer's competitors and enemies, such as Tony Stark.
