- Gene Wilder
- Sigerson Holmes
- Madeline Kahn
- Jenny Hill
- Marty Feldman
- Orville Sacker
- Dom DeLuise
- Gambetti
- Leo McKern
- Moriarty
- Roy Kinnear
- Moriarty's Assistant
- John Le Mesurier
- Lord Redcliff
- Douglas Wilmer
- Sherlock Holmes
- Thorley Walters
- Dr. Watson
- George Silver
- Bruner
- Nicholas Smith
- Hunkston
- John Hollis
- Moriarty's Gunman
- Aubrey Morris
- Coach Driver
- Tommy Godfrey
- Fred
- Susan Field
- Queen Victoria
- Joseph Behrmannis
- Russian
- Wolfe Morris
- Frenchman
- Julian Orchard
- Man in Tails
- Kenneth Benda
- Butler
- Michael Crane
- Renato
- Tony Sympson
- Opera Conductor
- Stephen Calcutt
- Oscar the page
- Hyma Beckley
- Opera House Audience Member
- Willy Bowman
- Opera House Audience Member
- John Brennan
- Concert Guest
- Mel Brooks
- Bruner
- Harold Coyne
- Waiter
- Maxwell Craig
- Music Hall Audience Member
- Albert Finney
- Man in Audience at Opera
- Aidan Harrington
- Music Hall Audience Member
- Juba Kennerley
- Music Hall Audience Member
- Alf Mangan
- Music Hall Audience Member
- Ken Parry
- Music Hall Conductor
- Richard A. Roth
- Moriarty's Assistant
- Bunny Seaman
- Ballroom Guest / Opera House Audience Member (uncredited)
- Anita Sharp-Bolster
- Old lady
- Philip Stewart
- Opera House Audience Member
- Rita Tobin-Weske
- Music Hall Audience Member
- Fred Wood
- Stage Roadie
