Guy Ritchie Director, Screenwriter, Producer Charlie Hunnam Arthur Actor Astrid Bergès-Frisbey The Mage Actor Jude Law Vortigern Actor Djimon Hounsou Bedivere Actor Eric Bana Uther Actor Aidan Gillen Bill Actor Freddie Fox Rubio Actor Craig McGinlay Percival Actor Tom Wu George Actor Kingsley Ben-Adir Wet Stick Actor Neil Maskell Back Lack Actor Annabelle Wallis Maggie Actor Zac Barker Young Arthur 2 Yrs Actor Oliver Zac Barker Young Arthur 2 Yrs Actor Geoff Bell Mischief John Actor Poppy Delevingne Igraine Actor Millie Brady Catia Actor Nicola Wren Lucy Actor Wil Coban Brothel Blackleg Actor Bleu Landau Blue Actor Joby Harold Screenwriter, Producer Lionel Wigram Screenwriter, Producer Akiva Goldsman Producer Tory Tunnell Producer Steve Clark-Hall Producer David Dobkin Executive Producer Bruce Berman Executive Producer Steven Mnuchin Executive Producer John Mathieson Cinematographer James Herbert Film Editing Daniel Pemberton Original Music Gemma Jackson Production Design Denis Schnegg Supervising Art Direction Thomas Brown Art Director Andrew Palmer Art Director Lizzie Kilham Art Director Anthony Caron-Delion Art Director Oliver Carroll Art Director James Collins Art Director Luke Hull Art Director Hayley Easton Street Art Director Georgia Warner Art Director Tina Jones Set Decoration Annie Symons Costume Design Reg Poerscout-Edgerton Casting