Charlie Hunnam Arthur
Eric Bana Uther Pendragon
Annabelle Wallis Maggie
Guy Ritchie Director, Producer, Screenplay, Inn Owner (uncredited)
Aidan Gillen William "Goosefat Bill"
Jude Law Vortigern
Djimon Hounsou Bedivere
David Beckham Trigger
Millie Brady Catia
Georgina Campbell Kay
Freddie Fox Rubio
Àstrid Bergès-Frisbey The Mage
Katie McGrath Elsa
Michael McElhatton Jack's Eye
Hermione Corfield Syren 3
Mikael Persbrandt Greybeard
Peter Guinness Baron 1
Neil Maskell Back Lack
Geoff Bell Mischief John
Eline Powell Syren 2
Kingsley Ben-Adir Tristan "Wet Stick"
Mark Umbers Baron 2
Tom Wu "Kung Fu" George
Adrian Bouchet Baron 3
Charlie Rawes Axeman
Rebecca Calder Maid 1
Daniel Pemberton Original Music Composer
Daniel Stisen SPAC / Londinum Fighter (uncredited)
Nick Cornwall Clan Head 1 (uncredited)
Annabel Wood Stunt Double
Akiva Goldsman Producer
Peter Ferdinando Earl of Mercia
Joby Harold Screenplay, Story, Producer
Gemma Jackson Production Design
David Dobkin Story, Executive Producer
Alan Turkington General 1
Lorraine Bruce Syren 1
Lee Nicholas Harris Dan Clan Mafia (uncredited)
Chris Lyons Special Effects Makeup Artist
Cali Nelle Stunt Double
Cristian Knight Stunts
Nathaniel De'Lineadeus Special Effects Makeup Artist
Pete Ford Stunts
Lucy Chappell Young Mother (uncredited)
Karl Farrer Nobleman (uncredited)
Max Keene Associate Producer, First Assistant Director
Bruce Berman Executive Producer
Marc Wolff Aerial Coordinator, Pilot
Joel Bryant Londinium Fighter (uncredited)
George Kirby Stunts
Christine Blundell Hair Designer, Makeup Designer
James Warren Mike
Michael Byrch Stunts
Simon Hayes Production Sound Mixer
Wil Coban Brother Blackleg
Luke Scott Stunts
Peter Burgis Foley
Sarah Lochlan Stunts
Chris Burdon Sound Re-Recording Mixer
Gintare Beinoraviciute Noble (uncredited)
Alan Stewart Second Unit Director of Photography
John Mathieson Director of Photography
Darrell Warner Costume Illustrator
Sarah-Jane De Crespigny Low-Rent Villager (uncredited)
Anthony Caron-Delion Art Direction
Steven Mnuchin Executive Producer
Craig McGinlay Percival "Percy"
Michael Schlingmann Storyboard Artist
Florence Bell Woman 1
Hayley Easton Street Art Direction
Poppy Delevingne Igraine
Rob Bliss Concept Artist