- Unknown:
- Friedrich von Schiller
- Unknown:
- Clemence Dane
- Composed By:
- Roberto Gerhard
- Unknown:
- Charles Spinks
- Harpsichord:
- Hubert Dawkes
- Produced By:
- H. B. Fortuin
- Domingo, the King's confessor:
- Miles Malleson
- Don Carlos:
- David Peel
- Marquis Posa:
- Laurence Payne
- Elisabeth Valois, Queen of Spain:
- Christine Finn
- Princess Eboli:
- Rosalie Crutchley
- Marchioness Mondecar:
- Judy Bailey
- Duchess Olivarez:
- Ella Milne
- Count Lerma:
- Godfrey Kenton
- Philip II, King of Spain:
- Leon Quartermaine
- Duke of Alba:
- Francis de Wolff
- The Queen's Page:
- S Grant
- Duke of Feria:
- Norman Claridge
- Admiral Medina Sidonia:
- Wilfrid Grantham
- Prince of Parma:
- John Rye
- The Infanta:
- Sheila Grant
- Count Taxis:
- Edgar Norfolk
- Grand Inquisitor of Spain:
- Ernest Milton
