Mercury is the name of several superheroes in a variety of different media.
- Mercury is one of the members of the Metal Men, a being of living mercury.
- Mercury is an ally to magician John Constantine.
- Max Mercury is a speedster hero and was the mentor to the young hero Impulse for a time.
- The Roman god Mercury and his Greek counterpart Hermes both also exist in the DC Universe.
- Mercury is also a minor enemy of the superhero Johnny Quick.
- Sgt. Mercury is a speedster hero in the comic book series Worldwatch.
- Sailor Mercury, ally of the Sailor Moon.