Firebrand is the name of several supervillains appearing in American comic books published by Marvel Comics. The first and most prominent, Gary Gilbert, is an enforcer for corrupt industrialist Justin Hammer and a former activist who turned to violence after believing peaceful protest produced no results.

The Gary Gilbert incarnation of Firebrand first appeared in Iron Man #27 (July 1970), and was created by Archie Goodwin and Don Heck.

The Russell Broxtel incarnation of Firebrand first appeared in Web of Spider-Man #77 (April 1991), and was created by Goodwin and Heck.

The Richard Dennison incarnation of Firebrand first appeared in Iron Man (vol. 3) #4 (March 1998), and was created by Kurt Busiek and Sean Chen.

The Amanda incarnation of Firebrand first appeared in Invincible Iron Man #513 (February 2012), and was created by Matt Fraction and Salvador Larroca.

The sixth unnamed incarnation of Firebrand made his sole appearance in Deadpool (vol. 5) #27 (April 2014), and was created by Fabian Nicieza and Scott Hepburn.

The Erikson Hades incarnation of Firebrand first appeared in Great Lakes Avengers #1 (October 2016), and was created by Zac Gorman and Will Robson.

Gary Gilbert was born in Detroit, Michigan. A superpowered enforcer for corrupt industrialist Justin Hammer, as Firebrand he is a former radical activist saboteur who turns to violence after believing peaceful protest produced no results. Firebrand's "clenched fist" logo on his chest recalls the Black Power movement.