• 
  Joseph Losey

  regizor

• 
  Barbara Bray

  scenarist

• 
  Edward Fox

  Cardinal Inquisitor
• 
  John Gielgud

  The Old Cardinal
• 
  Topol

  Galileo Galilei
• 
  Colin Blakely

  Priuli
• 
  Michael Gough

  Sagredo
• 
  Judy Parfitt

  Angelica Sarti

• 
  Richard O'Callaghan

  Fulganzio
• 
  John McEnery

  Federzoni
• 
  Georgia Brown

  Ballad Singer's Wife
• 
  Michael Lonsdale

  Cardinal Barberini (later Pope Urban VIII)
• 
  Patrick Magee

  Cardinal Bellarmin
• 
  Madeline Smith

  Young Court Lady
• 
  Bill Wallis

  Supporting Monk

• 
  Robert Bridges

  Fat Prelate
• 
  John Savident

  Second Senator
• 
  Basil Henson

  Infuriated Monk
• 
  Vernon Dobtcheff

  First Secretary
• 
  Margaret Leighton

  Elderly Court Lady
• 
  Clive Revill

  Ballad Singer