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

Jack Raine

Trebonius

Ian Wolfe

Caius Ligarius

Morgan Farley

Artemidorus

William Phipps

Servant to Antony

Douglass Dumbrille

Lepidus

Rhys Williams

Lucilius

Michael Ansara

Pindarus

Dayton Lummis

Messala

Paul Guilfoyle

Citizen of Rome

Edmund Purdom

Strato

Lawrence Dobkin

Citizen of Rome

Lumsden Hare

Publius

Michael Tolan

Officer to Octavius

John Lupton

Varro

John Parrish

Titinius

Thomas Browne Henry

Volumnius

David Bond

Citizen of Rome

Ann Tyrrell

Citizen of Rome

John Doucette

Carpenter, Citizen of Rome

Oliver Blake

Citizen of Rome

Donald Elson

Citizen of Rome

John Alderson

Citizen of Rome (uncredited)

Henny Backus

Citizen of Rome (uncredited)

Al Bain

Citizen of Rome (uncredited)

George Blagoi

Soldier (uncredited)

Booth Colman

Citizen of Rome (uncredited)

Gene Coogan

Citizen of Rome (uncredited)

Jimmy Dime

Citizen of Rome (uncredited)

Robert Fuller

Citizen of Rome (uncredited)

Ned Glass

Cobbler (uncredited)

Dabbs Greer

Citizen of Rome (uncredited)

Chester Hayes

Roman Soldier (uncredited)

Stuart Holmes

Senator (uncredited)

Shep Houghton

Soldier (uncredited)

Kenneth Kendall

Citizen of Rome by Mark Antony's Speech (uncredited)

Neyle Morrow

Citizen of Rome (uncredited)

Robert Nichols

Citizen of Rome (uncredited)

William H. O'Brien

Senator (uncredited)

Vic Perrin

Hoodlum (uncredited)

Jack Perry

Citizen of Rome (uncredited)

Harry 'Snub' Pollard

Citizen of Rome (uncredited)

Scott Seaton

Senator (uncredited)

Cap Somers

Citizen of Rome (uncredited)

Ray Spiker

Citizen of Rome (uncredited)

Irene Tedrow

Citizen of Rome (uncredited)