Director: Matthew Vaughn
- Joe Bacino (Posh Goon)
- Randall Batinkoff (Tre Fernandez)
- Nicolas Cage (Big Daddy/Damon Macready)
- Russell De Rozario (Man in Elevator)
- Anthony Desio (Baby Goon)
- Jason Flemyng (Lobby Goon)
- Dexter Fletcher (Cody)
- Tamer Hassan (Matthew)
- Val Jobara (Nervous Goon)
- Corey Johnson (Sporty Goon)
- Adrian Martinez (Ginger Goon)
- Kofi Natei (Rasul)
- Tim Plester (Danil)
- Stu Riley (Huge Goon)
- Michael Rispoli (Big Joe)
- Kenneth Simmons (Scary Goon)
- Omar A. Soriano (Leory)
- Mark Strong (Frank D,Amico)
- Christopher Mintz-Plasse originally auditioned for the role of Kick-Ass.
- In the final lines of the movie, Red Mist says: "As a great man once said: Wait 'till they get a load of me." He is quoting Jack Nicholson playing the Joker in Batman (1989).
- Nicolas Cage modeled his speech mannerisms as Big Daddy on original Batman (1966) Adam West. According to Matthew Vaughn, Cage started acting out his lines this way at the first costume fitting. Vaughn was happy for Cage to continue with this performance in the film, citing his irritation with the gravelly voice Christian Bale used in The Dark Knight (2008).
- In response to criticism towards Hit-Girl's character, Chloë Grace Moretz stated in an interview, "If I ever uttered one word that I said in Kick-Ass, I would be grounded for years! I'd be stuck in my room until I was twenty! I would never in a million years say that. I'm an average, everyday girl." Moretz has said that while filming, she could not bring herself to say the film's title out loud in interviews, instead calling it "the film" in public and "Kick-Butt" at home.
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