Marlon Brando
Mark Antony
James Mason
Brutus
John Gielgud
Cassius
Louis Calhern
Julius Caesar
Edmond O'Brien
Casca
Greer Garson
Calpurnia
Deborah Kerr
Portia
George Macready
Marullus
Michael Pate
Flavius
Richard Hale
A Soothsayer
Alan Napier
Cicero
John Hoyt
Decius Brutus
Tom Powers
Metellus Cimber
William Cottrell
Cinna
Jack Raine
Trebonius
Ian Wolfe
Ligarius
Morgan Farley
Artemidorus
Bill Phipps
Servant to Antony
Douglass Watson
Octavius Caesar
Douglass Dumbrille
Lepidus
Michael Ansara
Pindarus
Dayton Lummis
Messala
Edmund Purdom
Strato
Paul Guilfoyle
First Citizen of Rome
John Doucette
A Carpenter, Second Citizen
Lawrence Dobkin
Third Citizen of Rome
Jo Gilbert
Fourth Citizen of Rome
John Hardy
Lucius
Chester Stratton
Servant to Caesar
Lumsden Hare
Publius
Vic Perry
Popilius Lena
Michael Tolan
Officer to Octavius
Rhys Williams
Lucilius
John Lupton
Varro
John Parrish
Titinius
Joe Waring
Clitus
Stephen Roberts
Dardanius
Thomas Browne Henry
Volumnius
David Bond
Citizen of Rome
Ann Tyrrell
Citizen of Rome
John O'Malley
Citizen of Rome
Oliver Blake
Citizen of Rome
Alvin Hurwitz
Citizen of Rome
Donald Elson
Citizen of Rome
John Call
Citizen of Rome
Rudy Germane
Citizen of Rome (uncredited)
Miklós Rózsa
Music
Joseph Ruttenberg
Director of Photography
Cedric Gibbons
Art Direction
Edward C. Carfagno
Art Direction
John D. Dunning
Editor
Howard W. Koch
Assistant Director
Douglas Shearer
Recording Supervision
Edwin B. Willis
Set Decoration
Hugh Hunt
Set Decoration
Warren Newcombe
Special Effects
Herschel McCoy
Costume Design
Sydney Guilaroff
Hairstylist
William Tuttle
Makeup Supervisor
Joseph L. Mankiewicz
Director
P.M. Pasinetti
Technical Advisor
John Houseman
Producer
William Shakespeare
Theatre Play