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