Fredric March (Marcus Superbus)
Claudette Colbert (Empress Poppaea)
Elissa Landi (Mercia)
Charles Laughton (Nero)
Ian Keith (Tigellinus)
Ynez Seabury (Actor/Actress)
Nat Pendleton (Strabo)
William V. Mong (Licinius)
James Millican (Capt. Kevin Driscoll (1944 prologue))
Charles B. Middleton (Tyros)
Robert Manning (Philodemus)
Arthur Shields (Chaplain Costello (1944 prologue))
Kent Taylor (A lover)
Tom Tully (Hoboken (1944 prologue))
Florence Turner (Actor/Actress)
Ethel Wales (Complaining wife)
Horace B. Carpenter (Actor/Actress)
Jerome Storm (Actor/Actress)
Stanley Ridges (Chaplian Lloyd (1944 prologue))
Gertrude Norman (Actor/Actress)
Aline MacMahon (Actor/Actress)
Wilfred Lucas (Actor/Actress)
William Forrest (Colonel Hugh Mason (1944 prologue))
Lane Chandler (Christian in chains)
John Carradine (Leader of Gladiators/Christian Martyr/Crowd Voice)
Clarence Burton (Servillius)
Henry Brandon (Actor/Actress)
Joe Bonomo (Mute Giant)
Lionel Belmore (Bettor)
Joel Allen (Bombadier (1944 prologue))
Richard Alexander (Viturius)
Carol Holloway (Actor/Actress)
Dorothy Granger (Actor/Actress)
Harold Healy (Tybul)
Lillian Leighton (Actor/Actress)
Otto Lederer (Actor/Actress)
Angelo Rossitto (Pygmy)
John James (Lieutenant Herb Hanson (1944 prologue))
Ferdinand Gottschalk (Glabrio)
Joyzelle Joyner (Ancaria)
Harry Beresford (Flavius)
Arthur Hohl (Titus)
Tommy Conlon (Stephanus)
Vivian Tobin (Dacia)