Colin Firth (Harry Hart / Galahad), Samuel L. Jackson (Valentine), Mark Strong (Merlin), Taron Egerton (Gary 'Eggsy' Unwin), Sophie Cookson (Roxy), Sofia Boutella (Gazelle), Michael Caine (Arthur) more..., Mark Hamill (Professor Arnold), Samantha Womack (Michelle Unwin), Jonno Davies (Lee), Jack Davenport (Lancelot), Adrian Quinton (Terrorist), Alex Nikolov (Little Eggsy), Velibor Topic (Big Goon), Geoff Bell (Dean), Jordan Long (Poodle), Theo Barklem-Biggs (Ryan), Tobi Bakare (Jamal), Morgan Watkins (Rottweiler), Paul Kennington (Barman), Ralph Ineson (Policeman), Edward Holcroft (Charlie), Nicholas Banks (Digby), Jack Cutmore-Scott (Rufus), Nicholas Agnew (Nathaniel), Rowan Polonski (Piers), Tom Prior (Hugo), Fiona Hampton (Amelia), Bjørn Floberg (Scandinavian Prime Minister), Hanna Alström (Princess Tilde), Johanna Taylor (Valentine's Assistant 1), Lily Travers (Lady Sophie), Richard Brake (The Interrogator), Andrew Bridgmont (Kingsman Tailor), Corey Johnson (Church Leader), Anne Wittman (Church Blonde Woman), Andrei Lenart (Arctic Guard), Simon Green (Valentine's Butler), Lazara Storm (Valentine's Assistant 2), Sarah Hewson (Sky News Reader) and others.

Dave Gibbons (Characters), Mark Millar (Characters), Adam Bohling (Producer), David Reid (Producer), Matthew Vaughn (Producer), Jane Goldman (Writer), Matthew Vaughn (Writer) more..., Eddie Hamilton (Editor), Jon Harris (Editor), George Richmond (Director of Photography), Henry Jackman (Original Music Composer), Matthew Margeson (Original Music Composer), Reg Poerscout-Edgerton (Casting), Paul Kirby (Production Design), Andrew Ackland-Snow (Art Direction), Steve Carter (Art Direction), Paul Spriggs (Art Direction), Tom Whitehead (Art Direction), David Morison (Set Decoration), Arianne Phillips (Costume Design), Tamara Catlin-Birch (Art Department Coordinator), Jennifer Williams (Set Decoration), Andy Thomson (Supervising Art Director), Lucy Ward (Script Supervisor), Liang Yang (Stunts), John Bruno (Visual Effects Supervisor), Gordon Alexander (Stunts), Belinda McGinley (Stunts), Lucy Maycock (Stunts), Donna Williams (Stunts), Maxine Whittaker (Stunts), Sarah Lochlan (Stunts), Belle Williams (Stunts), Annabel Canaven (Stunts), Bradley James Allan (Stunt Coordinator),