Howard Hughes
Katharine Hepburn
Ava Gardner
Noah Dietrich
Juan Trippe
Senator Ralph Owen Brewster
Professor Fitz
Jack Frye
Jean Harlow
Errol Flynn
Johnny Meyer
Glenn Odekirk
Faith Domergue
Mrs. Hepburn
Robert Gross
Louis B. Mayer
Joseph Breen
Roland Sweet
Dr. Hepburn
Ludlow
Howard Hughes (9 yrs old)
Howard Hughes' Mother
HELL'S ANGELS Stunt Coordinator
HELL'S ANGELS Director of Photography
Cocoanut Grove Vocalist #1
Crony of Louis B. Mayer
Cocoanut Grove Band Member
Cigarette Girl
HELL'S ANGELS Pilot
Radio Announcer
Roscoe Turner
Aide to Howard
Maitre d'
Waiter
Cocoanut Grove Vocalist #2
Cocoanut Grove Patron
Engineer
Pan Am Executive #1
Man on Crutches
Timer
Little Girl
Uncle Willy
Another Guest #1
Another Guest #2
Chairman MPA
Hughes' Aide at Censor Hearing
Emcee
Spencer Tracy
Noah's Wife
Jack Frye's Wife, Helen
Cocoanut Grove Vocalist #3
Jorge
Hughes' Staff Person
Custodian
Marine
Doctor
FBI Agent
Brewster's Maid
Secretary
Another Senator
James McNamara (voice)
Pan Am Executive #2
Caretaker
Vivien Leigh (uncredited)
Esquire Starlet (uncredited)
Starlet (uncredited)
Coat Check Girl (uncredited)
Editor (uncredited)
Bi-Plane Mechanic (uncredited)
Military Officer (uncredited)
Howard Hughes' Film Editor (uncredited)