Firefly is a fictional character from the G.I. Joe: A Real American Hero toyline, comic books and animated series. He is a mercenary who works for the Cobra Organization as a saboteur. He is portrayed by Ray Stevenson in the 2013 film G.I. Joe: Retaliation.

George Raymond Stevenson was a Northern Irish actor. He portrayed Dagonet in the film King Arthur (2004) and Titus Pullo in the BBC/HBO television series Rome (2005–2007). He portrayed two Marvel Comics characters: Frank Castle / The Punisher in Punisher: War Zone (2008) and The Super Hero Squad Show and Volstagg in the Marvel Cinematic Universe (2011–2017). His other films include Kill the Irishman (2011), where he portrayed mobster Danny Greene; The Three Musketeers (2011); and RRR (2022), where he portrayed the villainous Governor Scott. His television roles include Ukrainian mobster Isaak Sirko in the seventh season of Dexter, Blackbeard in the third and fourth seasons of Black Sails, voicing Gar Saxon in Star Wars Rebels and Star Wars: The Clone Wars, and portraying Baylan Skoll in Ahsoka.