Charlie Hunnam Arthur
Aidan Gillen William "Goosefat Bill"
Jude Law Vortigern
Annabelle Wallis Maggie
Guy Ritchie Producer, Screenplay, Inn Owner (uncredited), Director
Eric Bana Uther Pendragon
Eline Powell Syren 2
Djimon Hounsou Bedivere
Lionel Wigram Screenplay, Producer
Freddie Fox Rubio
Tom Wu "Kung Fu" George
Millie Brady Catia
David Beckham Trigger
Mikael Persbrandt Greybeard
Geoff Bell Mischief John
Akiva Goldsman Producer
Wil Coban Brother Blackleg
Katie McGrath Elsa
Mark Umbers Baron 2
Àstrid Bergès-Frisbey The Mage
Max Keene First Assistant Director, Associate Producer
Uli Meyer Storyboard Artist
Andrew Palmer Art Direction
Daniel Stisen SPAC / Londinum Fighter (uncredited)
James Warren Mike
Georgina Campbell Kay
Denis Schnegg Supervising Art Director
Michael Cliett Digital Effects Supervisor
Matthew Skelding Dialogue Editor
Gemma Jackson Production Design
Peter Guinness Baron 1
Lucy Chappell Young Mother (uncredited)
Charlie Rawes Axeman
Donald McInnes Makeup Artist
Kingsley Ben-Adir Tristan "Wet Stick"
Gintare Beinoraviciute Noble (uncredited)
Terry Archer Set Costumer
Nick Davis VFX Supervisor
Hermione Corfield Syren 3
Michael McElhatton Jack's Eye
Craig McGinlay Percival "Percy"
Poppy Delevingne Igraine
Simon Hayes Production Sound Mixer
Lorraine Bruce Syren 1
Anthony Caron-Delion Art Direction
Nick Cornwall Clan Head 1 (uncredited)
Jonathan Fawkner Visual Effects Supervisor
Neil Maskell Back Lack
Andrew Stirk Sound Re-Recording Mixer
Alan Turkington General 1
Daniel Smith Still Photographer
Flora Moody Makeup Artist
Adrian Bouchet Baron 3
Karen Elliott Music Supervisor
Alex Bicknell Visual Effects Producer
Cristian Knight Stunts
John Marzano Aerial Director of Photography
Marc Wolff Aerial Coordinator, Pilot
Rebecca Calder Maid 1
Florence Bell Woman 1
Will Samuelson Aerial Coordinator
Chris Burdon Sound Re-Recording Mixer
George Kirby Stunts
Luke Scott Stunts
Angus Munro Second Film Editor
Rudy Barrow Londinium Fighter (uncredited)
Tabitha Quitman Art Department Coordinator
Mike Valentine Underwater Camera
Bruce Berman Executive Producer
Luan Placks Assistant Costume Designer
Lucia Foster Found Aerial Coordinator
Daniel Hillary Third Assistant Director