Michelle Williams as Gail Harris

Mark Wahlberg as Fletcher Chase

Christopher Plummer as Jean Paul Getty

Charlie Plummer as John Paul Getty III

Romain Duris as Cinquanta

Timothy Hutton as Oswald Hinge

Charlie Shotwell as John Paul Getty III (Age 7)

Andrew Buchan as John Paul Getty II

Marco Leonardi as Saverio Mammoliti

Giuseppe Bonifati as Giovanni Iacovoni

Nicolas Vaporidis as Il Tamia 'Chipmunk'

Andrea Piedimonte Bodini as Corvo

Guglielmo Favilla as Piccolino

Adele Tirante as Maria

Stacy Martin as Nancy

Maya Kelly as Aileen Getty (Age 6)

Anna Devlin as Aileen Getty (Age 15)

Kit Cranston as Mark Getty (Age 4)

Stanley Treshansky as Mark Getty (Age 13)

Ginevra Migliore as Ariadne Getty (Age 2)

Josie Sayers as Ariadne Getty (Age 11)

Olivia Grant as Millicent

Charlotte Beckett as Annie

Roy McCrerey as Attorney

Giulio Base as Coroner

Nicola Di Chio as Kidnap Van Driver

Alessandra Roca as Prostitue #1

Francesca Inaudi as Prostitute #2

Francesco Bomenuto as Rome Hotel Butler

Ghassan Massoud as Arab Sheikh

Clive Wood as Bullimore

Jonathan Aris as Conservator

Oliver Ryan as BBC Reporter

Cherise Silvestri as Secretary Getty Oil

Enzo Attanasio as Barn Man

Monica Nappo as Barn Woman

Gino Nardella as Villager #1

Chantal Ughi as Villager #2

Riccardo De Torrebruna as Carabinieri Captain

David Brooks as Playboy Interviewer

Giannina Facio as Otto Lam's Assistant