Richard Burton

Marcellus Gallio

Jean Simmons

Diana

Victor Mature

Demetrius

Richard Boone

Pontius Pilate

Leon Askin

Abidor

Michael Rennie

Peter

Dean Jagger

Justus

Jay Robinson

Caligula

Torin Thatcher

Sen. Gallio

Betta St. John

Miriam

Jeff Morrow

Paulus

Ernest Thesiger

Emperor Tiberius

Dawn Addams

Junia

Bess Flowers

Spectator at Caligula's court (uncredited)

Michael Ansara

Judas (uncredited)

Percy Helton

Caleb, the wine merchant (uncredited)

Thomas Browne Henry

Marius, the physician (uncredited)

Rosalind Ivan

Julia (uncredited)

George E. Stone

Gracchus (uncredited)

Jay Novello

Tiro (uncredited)

Hayden Rorke

Bidder at slave auction (uncredited)

Arthur Tovey

Roman Soldier (uncredited)

Harry Shearer

David (uncredited)

Mae Marsh

Jerusalem Woman Aiding Demetrius (uncredited)

Ben Astar

Cleander (uncredited)