- Michelle Williams Gail Harris
- Christopher Plummer Jean Paul Getty
- Mark Wahlberg Fletcher Chase
- Romain Duris Cinquanta
- Timothy Hutton Oswald Hinge
- Charlie Plummer John Paul Getty III
- Marco Leonardi Mammoliti
- Charlie Shotwell John Paul Getty III (joven)
- Francesca Inaudi Prostituta
- Nicolas Vaporidis Il Tamia 'Chipmunk'