Malcolm McDowell as Caligula

Teresa Ann Savoy as Drusilla

Helen Mirren as Caesonia

Peter O'Toole as Tiberius

John Steiner as Longinus

Guido Mannari as Macro

Paolo Bonacelli as Chaerea

Leopoldo Trieste as Charicles

Giancarlo Badessi as Claudius

Mirella D'Angelo as Livia

Anneka Di Lorenzo as Messalina

Lori Wagner as Agrippina

Adriana Asti as Ennia

John Gielgud as Nerva

Bruno Brive as Gemellus

Rick Parets as Mnester

Paula Mitchell as Subura Singer

Osiride Pevarello as Giant

Donato Placido as Proculus