Clive Owen

Character: Arthur

Ioan Gruffudd

Character: Lancelot

Keira Knightley

Character: Guinevere

Mads Mikkelsen

Character: Tristan

Joel Edgerton

Character: Gawain

Hugh Dancy

Character: Galahad

Ray Winstone

Character: Bors

Stephen Dillane

Character: Merlin

Ray Stevenson

Character: Dagonet

Til Schweiger

Character: Cynric

Stellan Skarsgård

Character: Cerdic

Sean Gilder

Character: Jols

Ken Stott

Character: Marius Honorius

Charlie Creed-Miles

Character: Ganis

David Murray

Character: Merlin's Lieutenant

Ned Dennehy

Character: Mental Monk

Phelim Drew

Character: Obnoxius Monk

Des Braiden

Character: Third Monk

Bosco Hogan

Character: Bishop Decoy

David Wilmot

Character: Woad Killed by Lancelot

Lochlann Ó Mearáin

Character: Roman Commander

Ivano Marescotti

Character: Bishop Germanus

Clive Russell

Character: Lancelot's Father

Graham McTavish

Character: Roman Officer

Dessie Gallagher

Character: Mercenary

Elliot Henderson-Boyle

Character: Young Lancelot

Owen Teale

Character: Pelagius (uncredited)

Dawn Bradfield

Character: Vanora

Pat Kinevane

Character: Horton

Paul Tall-Order Ritchie

Character: Saxon (uncredited)

Lorenzo De Angelis

Character: Alecto