Miles O'Keeffe
Sir Gawain
Cyrielle Clair
Linet
Leigh Lawson
Humphrey
Sean Connery
The Green Knight
Trevor Howard
The King
Peter Cushing
Seneschal
Ronald Lacey
Oswald
Lila Kedrova
Lady of Lyonesse
John Rhys-Davies
Baron Fortinbras
Wilfrid Brambell
Porter
Bruce Lidington
Sir Bertilak
Douglas Wilmer
The Black Knight
Brian Coburn
Friar Vosper
David Rappaport
Sage
Emma Sutton
Morgan La Fey
Thomas Heathcote
Armourer
John Serret
Priest
Mike Edmonds
Tiny Man
J
John Pierce Jones
Sergeant
J
James Windsor
1st Recruit
R
Richardson Morgan
2nd Recruit
P
Peter Mackriel
3rd Recruit
Jerold Wells
1st Torturer
H
Harry Jones
2nd Torturer
J
John J. Carney
Messenger
Peter Firth
Sir Gaiwan (uncredited voice)