Graham Chapman
King Arthur / Voice of God / Middle Head / Hiccoughing Guard
John Cleese
Second Swallow-Savvy Guard / The Black Knight / Peasant 3 / Sir Launcelot the Brave / Taunting French Guard / Tim the Enchanter
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
Terry Gilliam
Patsy / Green Knight / Old Man from Scene 24 (Bridgekeeper) / Sir Bors / Animator / Gorilla Hand
Terry Jones
Dennis's Mother / Sir Bedevere / Left Head / Prince Herbert / Voice of Cartoon Scribe
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!
Connie Booth
The Witch
Carol Cleveland
Zoot / Dingo
Neil Innes
First Monk / Singing Minstrel / Page Crushed by the Rabbit / Peasant #4
Bee Duffell
Old Crone
John Young
Dead Body / Historian Frank
Rita Davies
Historian's Wife
Avril Stewart
Dr. Piglet
Sally Kinghorn
Dr. Winston
Mark Zycon
Prisoner
Elspeth Cameron
Girl in Castle Anthrax
Mitsuko Forstater
Girl in Castle Anthrax
Sandy Johnson
Knight of Ni / Villager at Witch Burning / Musician at Wedding / Monk / Knight in Battle
Sandy Rose
Girl in Castle Anthrax
Romilly Squire
Musician at Wedding / Villager at Witch Burning
Joni Flynn
Girl in Castle Anthrax
Alison Walker
Girl in Castle Anthrax
Loraine Ward
Girl in Castle Anthrax
Anna Lanski
Girl in Castle Anthrax
Sally Coombe
Girl in Castle Anthrax
Vivienne MacDonald
Girl in Castle Anthrax
Yvonne Dick
Girl in Castle Anthrax
Daphne Darling
Girl in Castle Anthrax
Fiona Gordon
Girl in Castle Anthrax
Judy Lamb
Girl in Castle Anthrax
Tracy Sneddon
Girl in Castle Anthrax
Joyce Pollner
Girl in Castle Anthrax
Mary Allen
Girl in Castle Anthrax
Gloria Graham
Girl in Castle Anthrax
Sylvia Taylor
Girl in Castle Anthrax
Iain Banks
Knight in Battle (uncredited)
Julian Doyle
Police Sergeant (uncredited)
Margarita Doyle
Peasant (uncredited)
Charles Knode
Camp Guard / Robin's Minstrel (uncredited)
Zack Matalon
Guard who Falls into Barrels (uncredited)
Scott Mike
Bash (Mudfighter (uncredited)
William Palin
Sir Not-Appearing-in-this-Film (uncredited)
Tom Raeburn
Guard Eating Apple (uncredited)
Brian Ross
Biff (Mudfighter) (uncredited)
Roy Forge Smith
Inspector End of Film (uncredited)
Maggie Weston
Page-turner (uncredited)
John Thornton
Dancing Knight (uncredited)