- Stewart Granger
- Philip Konigsmark
- Joan Greenwood
- Sophie Dorothea
- Flora Robson
- Countess Platen
- Françoise Rosay
- The Electress Sophia
- Frederick Valk
- The Elector Ernest Augustus
- Peter Bull
- Prince George Louis
- Anthony Quayle
- Durer
- Michael Gough
- Prince Charles
- Megs Jenkins
- Frau Busche
- Jill Balcon
- Knesebeck
- David Horne
- Duke George William
- Mercia Swinburne
- Countess Eleanore
- Cecil Trouncer
- Major Eck
- Noel Howlett
- Count Platen
- Barbara Leake
- Maria
- Miles Malleson
- Lord of Misrule
- Anthony Lang
- Young Prince George
- Rosemary Lang
- Young Princess Sophie
- Edward Sinclair
- Nils
- Allan Jeayes
- Governor of Ahlden
- Aubrey Mallalieu
- Envoy at Ahlden
- Guy Rolfe
- Envoy at Ahlden
- Margaret Vines
- Servant
- Peter George
- Anders
- W.E. Holloway
- Lawyer
- Myles Eason
- Soldier
- Victor Adams
- Soldier
- Peter Albrecht
- Soldier
- Janet Howe
- Spanish Singer
- Peter Arne
- Assailant
- Sandra Dorne
- (uncredited)
- John Gregson
- (uncredited)
- Christopher Lee
- Herzog Anthony von Wolfenbüttel (rehearsed only)
- Jack May
- Reveller
- Barbara Murray
- (uncredited)
- Constance Smith
- Bit
- Anthony Steel
- (uncredited)
- James Ure
- Courtier
- Dennis Vance
- Bit
- Michael Ward
- (uncredited)
