- Kirk Douglas as Spartacus
- Laurence Olivier as Crassus
- Anthony Hopkins as Crassus (uncredited dub; 1991 restoration[10])
- Jean Simmons as Varinia
- Charles Laughton as Gracchus
- Peter Ustinov as Batiatus
- Tony Curtis as Antoninus
- John Gavin as Julius Caesar
- John Dall as Marcus Glabrus
- Nina Foch as Helena Glabrus
- John Ireland as Crixus
- Herbert Lom as Tigranes Levantus (pirate envoy)
- Charles McGraw as Marcellus
- Joanna Barnes as Claudia Marius
- Harold J. Stone as David
- Woody Strode as Draba
- Peter Brocco as Ramon
- Paul Lambert as Gannicus
- Robert J. Wilke as Guard Captain
- Nicholas Dennis as Dionysius
- John Hoyt as Caius
- Frederic Worlock as Laelius
- Gil Perkins as Slave Leader (uncredited)
- Cliff Lyons as Soldier (uncredited)
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