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

Sandy Johnson

Knight of Ni / Villager at Witch Burning / Musician at Wedding / Monk / Knight in Battle

Joni Flynn

Girl in Castle Anthrax

Fiona Gordon

Girl in Castle Anthrax

Julian Doyle

Police Sergeant (uncredited)