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