John Cleese Second Swallow-Savvy Guard / The Black Knight / Peasant 3 / Sir Launcelot the Brave / Taunting French Guard / Tim the Enchanter, Writer
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
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
Terry Gilliam Director, Patsy / Green Knight / Old Man from Scene 24 (Bridgekeeper) / Sir Bors / Animator / Gorilla Hand, Writer
Rita Davies Historian's Wife
Gary Cooper Thanks
Terry Jones Director, Dennis's Mother / Sir Bedevere / Left Head / Prince Herbert / Voice of Cartoon Scribe, Writer
Connie Booth The Witch
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 Production Design, Inspector End of Film (uncredited)
Campbell Askew Assistant Editor
Penny Eyles Continuity
Hazel Pethig Costume Design
Gloria Graham Girl in Castle Anthrax
Ian Crafford Sound Effects
Mitsuko Forstater Girl in Castle Anthrax
Iain Banks Knight in Battle (uncredited)
Bill Harman Construction Manager
Mark Forstater Producer
Vivienne MacDonald Girl in Castle Anthrax
Julian Doyle Production Manager, Police Sergeant (uncredited)
John Young Dead Body / Historian Frank
Avril Stewart Dr. Piglet
Fiona Gordon Girl in Castle Anthrax
Tom Raeburn Property Master, Guard Eating Apple (uncredited)
Joyce Pollner Girl in Castle Anthrax
Sandy Rose Girl in Castle Anthrax
Terry Bedford Director of Photography
Leo Kharibian Choreographer
Daphne Darling Girl in Castle Anthrax
Mary Allen Girl in Castle Anthrax
Graham Bullock Painter
Pam Luke Makeup Artist
John Hackney Editor
Tracy Sneddon Girl in Castle Anthrax
Jean-Raphaël Dedieu Sound Effects Editor
Maggie Weston Page-turner (uncredited)
Christine Watt Production Secretary
Philip Cowlam Assistant Art Director
Yvonne Dick Girl in Castle Anthrax
Mark Zycon Prisoner
Zack Matalon Guard who Falls into Barrels (uncredited)
Sally Coombe Girl in Castle Anthrax
Gerry Harrison Assistant Director
Judy Lamb Girl in Castle Anthrax
Anna Lanski Girl in Castle Anthrax
Loraine Ward Girl in Castle Anthrax
Alison Walker Girl in Castle Anthrax
John Thornton Dancing Knight (uncredited)
Brian Ross Biff (Mudfighter) (uncredited)
Sylvia Taylor Girl in Castle Anthrax
Elspeth Cameron Girl in Castle Anthrax
John Horton Special Effects
Nobby Clark Carpenter
John Foster Sound
Brian Winterborn Property Buyer
Garth Marshall Sound Recordist
Brian Brockwell Accountant