Leonardo DiCaprio
Howard Hughes
Cate Blanchett
Katharine Hepburn
Kate Beckinsale
Ava Gardner
John C. Reilly
Noah Dietrich
Alec Baldwin
Juan Trippe
Alan Alda
Senator Ralph Owen Brewster
Ian Holm
Professor Fitz
Danny Huston
Jack Frye
Gwen Stefani
Jean Harlow
Jude Law
Errol Flynn
Adam Scott
Johnny Meyer
Matt Ross
Glenn Odekirk
Kelli Garner
Faith Domergue
Frances Conroy
Mrs. Hepburn
Brent Spiner
Robert Gross
Stanley DeSantis
Louis B. Mayer
Edward Herrmann
Joseph Breen
Willem Dafoe
Roland Sweet
Kenneth Welsh
Dr. Hepburn
J.C. MacKenzie
Ludlow
Jacob Davich
Howard Hughes (9 yrs old)
Amy Sloan
Howard Hughes' Mother
Sam Hennings
HELL'S ANGELS Stunt Coordinator
Joe Chrest
HELL'S ANGELS Director of Photography
Rufus Wainwright
Cocoanut Grove Vocalist #1
Harry Strandjofski
Crony of Louis B. Mayer
Vince Giordano
Cocoanut Grove Band Member
Josie Maran
Cigarette Girl
Justin Shilton
HELL'S ANGELS Pilot
Arthur Holden
Radio Announcer
Raymond Ducasse
Roscoe Turner
Joseph P. Reidy
Aide to Howard
Stéphane Demers
Maitre d'
Yves Jacques
Waiter
Loudon Wainwright III
Cocoanut Grove Vocalist #2
Jason Cavalier
Cocoanut Grove Patron
Chris Ufland
Engineer
Al Dubois
Pan Am Executive #1
Alan Toy
Man on Crutches
Sebastian Tillinger
Timer
Francesca Scorsese
Little Girl
Charlotte Scott
Little Girl
James Bradford
Uncle Willy
Joe Cobden
Another Guest #1
Linda E. Smith
Another Guest #2
Alan Fawcett
Chairman MPA
Jordan St. James
Hughes' Aide at Censor Hearing
David Purdham
Emcee
Kevin O'Rourke
Spencer Tracy
Lisa Bronwyn Moore
Noah's Wife
Emma Campbell
Jack Frye's Wife, Helen
Martha Wainwright
Cocoanut Grove Vocalist #3
Vincent Laresca
Jorge
Matt Holland
Hughes' Staff Person
Dennis St John
Custodian
Keith Campbell
Marine
Al Vandecruys
Doctor
James Rae
FBI Agent
Kathleen McAuliffe
Brewster's Maid
Nellie Sciutto
Secretary
Terry Haig
Another Senator
James McNamara
James McNamara (voice)
John Koensgen
Pan Am Executive #2
Vladimir Kuznetsov Smith
Caretaker
Mark Akeson
Caretaker
Jason Pollard
Caretaker
Heather Petrone
Vivien Leigh (uncredited)
Danielle Franke
Esquire Starlet (uncredited)
Meghan Elizabeth
Starlet (uncredited)
Elizabeth DeCicco
Starlet (uncredited)
Elisa Dyann
Coat Check Girl (uncredited)
Isabelle Champeau
Editor (uncredited)
Al Coronel
Bi-Plane Mechanic (uncredited)
Gerardo Lo Dico
Military Officer (uncredited)
Anne V. Coates
Howard Hughes' Film Editor (uncredited)