Robert Taylor as Lancelot

Ava Gardner as Guinevere

Mel Ferrer as Arthur

Anne Crawford as Morgan Le Fay

Stanley Baker as Modred

Felix Aylmer as Merlin

Maureen Swanson as Elaine

Gabriel Woolf as Percival

Anthony Forwood as Gareth

Robert Urquhart as Gawaine

Niall MacGinnis as Green Knight

Ann Hanslip as Nan

Jill Clifford as Bronwyn

Stephen Vercoe as Agravaine

Alan Tilvern as Steward (uncredited)

Patricia Owens as Lady Vivien (uncredited)

Dana Wynter as Morgan Le Fay's servant (uncredited)

Julia Arnall as Bit Role