• 
• Margo
• The Baroness Mary Vetsera
  

• 
• Glenn Anders
• Koinoff
  

• 
• Edith Atwater
• Baronin von Neustadt
  

• 
• Wyrley Birch
• Sceps
  

• 
• Edward Broadley
• Loschek
  

• 
• Leo G. Carroll
• Count Joseph Hoyos
  

• 
• Dudley Digges
• The Emperor Franz Joseph of Austria-Hungary
  

• 
• Bijou Fernandez
• Marie
  

• 
• Pauline Frederick
• The Empress Elizabeth of Austria-Hungary
  

• 
• Alan Hewitt
• Fritz von Bremer
  

• 
• Joseph Holland
• The Archduke John of Tuscany
  

• 
• John Hoyt
• Baron von Neustadt
  

• 
• Henry Hull
• The Crown Prince Rudolph of Austria-Hungary
  

• 
• Henry Hull Jr.
• Bratfish
  

• 
• Benjamin Otis
• D'Orsy
  

• 
• Herbert Yost
• Count Taafe
  

• 
• Elizabeth Young
• Louise
  

• 
• Pierre Chace
• A Servant
  

• 
• Frank Downing
• An Officer
  

• 
• Charles Holden
• A Soldier
  

• 
• Catherine Lawrence
• A Maid
  

• 
• Hobart Skidmore
• A Soldier
  

• 
• Maxwell Anderson
• Writer
  

• 
• Philip Moeller
• Director
  

• 
• Lee Simonson
• Scenic Design
  Costume Design
  

• 
• Charles Holden
• Stage Manager
  

• 
• Frank Downing
• Assistant Stage Manager
  

• 
• Henry Hull Jr.
• Assistant Stage Manager
  

• 
• The Theatre Guild
• Producer