Malcolm McDowell

Caligula

Teresa Ann Savoy

Drusilla

Helen Mirren

Caesonia

Peter O'Toole

Tiberius

John Steiner

Longinus

Guido Mannari

Macro

Paolo Bonacelli

Chaerea

Leopoldo Trieste

Charicles

Giancarlo Badessi

Claudius

Mirella D'Angelo

Livia

Anneka Di Lorenzo

Messalina

Lori Wagner

Agrippina

Adriana Asti

Ennia

John Gielgud

Nerva

Bruno Brive

Gemellus

Rick Parets

Mnester

Paula Mitchell

Subura Singer

Osiride Pevarello

Giant

Donato Placido

Proculus

Angela La Vorgna

Tortured Slave (uncredited)