- Bing Crosby
- Hank Martin
- Rhonda Fleming
- Alisande La Carteloise / Sandy Pendragon
- Cedric Hardwicke
- King Arthur / Lord Pendragon (as Sir Cedric Hardwicke)
- William Bendix
- Sir Sagramore
- Murvyn Vye
- Merlin
- Virginia Field
- Morgan Le Fay
- Joseph Vitale
- Sir Logris
- Henry Wilcoxon
- Sir Lancelot
- Richard Webb
- Sir Galahad
- Alan Napier
- High Executioner
- Julia Faye
- Lady Penelope
- Mary Field
- Peasant Woman
- Ann Carter
- Peasant Girl
- Eric Alden
- Jailer
- Fred Aldrich
- Peasant
- Al Bain
- Footman
- Lucille Barkley
- Page Girl
- Chet Brandenburg
- Peasant
- Colin Campbell
- Executioner
- George Cathrey
- Sir Kay
- Tony Cirillo
- Idiot #2
- Charles Coleman
- Richard - Lord Pendragon's Aide
- Jim Davies
- Slave Overseer
- Donya Dean
- Noblewoman / Slave (uncredited)
- Vernon Dent
- Guard
- Lester Dorr
- Townsman
- George Douglas
- Sergeant at Arms
- Jimmie Dundee
- Henchman / Sergeant at Arms (uncredited)
- Tay Dunn
- Sir Persant
- Art Foster
- Axeman
- John George
- Peasant
- John Goldsworthy
- Guard
- Robert Graham
- Boy
- Alec Harford
- Little Man
- Jimmy Hawkins
- Boy
- Timmy Hawkins
- Boy
- Olin Howland
- Sam - Connecticut Postman
- Olaf Hytten
- Tailor
- Duke Johnson
- Juggler
- Anthony Jowitt
- Bidder at Auction / Townsman (uncredited)
- Richard Keene
- Royal Cook
- George Kirby
- Tailor
- Larry Lawson
- Henchman
- Babe London
- Fat Woman
- Joseph Marr
- Bidder at Auction
- Doreen McCann
- Girl
- John 'Skins' Miller
- Skins / Idiot #1 (uncredited)
- Roger Moore
- Bidder
- Bob Morgan
- Henchman
- Frances Morris
- Townswoman
- Leonard Mudie
- Lord Mayor's Aide
- Ottola Nesmith
- Tourist
- Georgie Nokes
- Boy
- B.G. Norman
- Boy
- Anton Northpole
- Footman
- Vesey O'Davoren
- Castle Servant
- Dorothy Phillips
- Townswoman
- Hugh Prosser
- Sir Bedivere
- Joey Ray
- Townsman
- Gordon Richards
- Tour Guide
- Loretta Russell
- Aristocrat
- Russell Saunders
- Acrobat
- Paul Scardon
- White Haired Peddler
- Reginald Sheffield
- Auctioneer
- Art Stewart
- Lancelot's Man at Arms
- David Stollery
- Billy
- Fred Sweeney
- Peasant
- Larry Thompson
- Watchman
- Victor Travis
- Peasant
- Harry Wilson
- Guard
- Frederick Worlock
- Lord Mayor
- Fred Zendar
- Peasant
