John Cleese Second Swallow-Savvy Guard / The Black Knight / Peasant 3 / Sir Launcelot the Brave / Taunting French Guard / Tim the Enchanter, Writer
Terry Gilliam Patsy / Green Knight / Old Man from Scene 24 (Bridgekeeper) / Sir Bors / Animator / Gorilla Hand, Writer, Director
Michael Palin First Swallow-Savvy Guard / Dennis / Peasant 2 / Right Head / Sir Galahad the Pure / Narrator / King of Swamp Castle / Brother Maynard's Brother / Leader of The Knights Who Say NI!, Writer
Terry Jones Dennis's Mother / Sir Bedevere / Left Head / Prince Herbert / Voice of Cartoon Scribe, Director, Writer
Eric Idle Dead Collector / Peasant 1 / Sir Robin the Not-Quite-So-Brave-as-Sir Launcelot / First Swamp Castle Guard / Concorde / Roger the Shrubber / Brother Maynard, Writer
Gary Cooper Thanks
Connie Booth The Witch
Rita Davies Historian's Wife
Carol Cleveland Zoot / Dingo
Graham Chapman King Arthur / Voice of God / Middle Head / Hiccoughing Guard, Writer
Sandy Johnson Knight of Ni / Villager at Witch Burning / Musician at Wedding / Monk / Knight in Battle
Bee Duffell Old Crone
Neil Innes First Monk / Singing Minstrel / Page Crushed by the Rabbit / Peasant #4
Michael White Producer, Presenter
Roger Pratt Assistant Camera
Charles Knode Camp Guard / Robin's Minstrel (uncredited)
Sally Kinghorn Dr. Winston
Joni Flynn Girl in Castle Anthrax
John Goldstone Executive Producer
Thomas Malory Writer
Hugh Strain Sound Mixer
Margarita Doyle Peasant (uncredited)
Howard Atherton Camera Operator
Roy Forge Smith Inspector End of Film (uncredited), Production Design
Penny Eyles Continuity
Hazel Pethig Costume Design
Gloria Graham Girl in Castle Anthrax
Ian Crafford Sound Effects
Iain Banks Knight in Battle (uncredited)
Mitsuko Forstater Girl in Castle Anthrax
Bill Harman Construction Manager
Mark Forstater Producer
Campbell Askew Assistant Editor
Vivienne MacDonald Girl in Castle Anthrax
Julian Doyle Police Sergeant (uncredited), Production Manager
John Young Dead Body / Historian Frank
Avril Stewart Dr. Piglet
Fiona Gordon Girl in Castle Anthrax
Tom Raeburn Guard Eating Apple (uncredited), Property Master
Joyce Pollner Girl in Castle Anthrax
Terry Bedford Director of Photography
Sandy Rose Girl in Castle Anthrax
Leo Kharibian Choreographer
Daphne Darling Girl in Castle Anthrax
Mary Allen Girl in Castle Anthrax
Graham Bullock Painter
John Hackney Editor
Pam Luke Makeup Artist
Tracy Sneddon Girl in Castle Anthrax
Jean-Raphaël Dedieu Sound Effects Editor
Maggie Weston Page-turner (uncredited)
Zack Matalon Guard who Falls into Barrels (uncredited)
Philip Cowlam Assistant Art Director
Mark Zycon Prisoner
Yvonne Dick Girl in Castle Anthrax
Christine Watt Production Secretary
Sylvia Taylor Girl in Castle Anthrax
Sally Coombe Girl in Castle Anthrax
Judy Lamb Girl in Castle Anthrax
Anna Lanski Girl in Castle Anthrax
Gerry Harrison Assistant Director
Loraine Ward Girl in Castle Anthrax
Alison Walker Girl in Castle Anthrax
John Thornton Dancing Knight (uncredited)
Brian Ross Biff (Mudfighter) (uncredited)
Elspeth Cameron Girl in Castle Anthrax
John Horton Special Effects
Brian Winterborn Property Buyer
John Foster Sound
William Palin Sir Not-Appearing-in-this-Film (uncredited)
Garth Marshall Sound Recordist
Brian Brockwell Accountant