Charlie Hunnam
Arthur
Jude Law
Vortigern
Astrid Bergès-Frisbey
The Mage
Eric Bana
Uther Pendragon
Djimon Hounsou
Bedivere
Aidan Gillen
William "Goosefat Bill"
Kingsley Ben-Adir
Tristan "Wet Stick"
Neil Maskell
Back Lack
Craig McGinlay
Percival "Percy"
Tom Wu
"Kung Fu" George
Freddie Fox
Rubio
Mikael Persbrandt
Greybeard
Peter Ferdinando
Earl of Mercia
Geoff Bell
Mischief John
Annabelle Wallis
Maggie
Katie McGrath
Elsa
Lorraine Bruce
Syren 1
Eline Powell
Syren 2
Hermione Corfield
Syren 3
Bleu Landau
Blue
Poppy Delevingne
Igraine
Millie Brady
Catia
Zac Barker
Young Arthur 2 Yrs
Oliver Barker
Young Arthur 2 Yrs
Nicola Wren
Lucy
Wil Coban
Brother Blackleg
Jacqui Ainsley
Lady of the Lake
Rob Knighton
Mordred
Michael Hadley
Mage King
David Beckham
Trigger
Alan Turkington
General 1
Michael McElhatton
Jack's Eye
Charlie Rawes
Axeman
James Warren
Mike
Ellie Graham
Maria
Kamil Lemieszewski
Merlin
Kalle Hennie
Viking
Peter Guinness
Baron 1
Mark Umbers
Baron 2
Adrian Bouchet
Baron 3
Florence Bell
Woman 1
Anna Brooks Beckman
Woman 2
Cordelia Bugeja
Woman 3
Rebecca Calder
Maid 1
Lee Nicholas Harris
Dan Clan Mafia (uncredited)
Gintare Beinoraviciute
Noble (uncredited)
Alice E. Mayer
Noble Girl (uncredited)
Claira Watson Parr
Noblewoman (uncredited)
Alphonso Austin
Slave Labourer (uncredited)
Rudy Barrow
Londinium Fighter (uncredited)
Daniel Stisen
SPAC / Londinum Fighter (uncredited)
Joel Bryant
Londinium Fighter (uncredited)
Dacio Caballero
Fighter (uncredited)
Lucy Chappell
Young Mother (uncredited)
Jamie B. Chambers
Knight (uncredited)
Pedro Caxade
Vortigern's Guard (uncredited)
Nick Cornwall
Clan Head 1 (uncredited)
Steve Barnett
Brothel Punter (uncredited)
Guy Ritchie
Inn Owner
Steen Young
Nemesis (uncredited)
Jason Lines
Miscellaneous (uncredited)
Tom Coulston
Pendragon Soldier