David Niven:Sir Charles Lytton;Peter Sellers:Insp. Jacques Clouseau;Robert Wagner:George Lytton;Capucine:Simone Clouseau;Brenda De Banzie:Angela Dunning;Colin Gordon:Tucker;John Le Mesurier:Defence Barrister (as John LeMesurier);James Lanphier:Saloud;Guy Thomajan:Artoff;Michael Trubshawe:Felix Townes;Riccardo Billi:Aristotle Sarajos;Meri Welles:Monica Fawn (as Meri Wells);Martin Miller:Pierre Luigi - Photographer;Fran Jeffries:Greek 'cousin';Claudia Cardinale:The Princess Dala;John Bartha:Policeman (uncredited);William Bryant:Policeman (uncredited);Mario Fabrizi:Hotel Manager (uncredited);Eugene Walter:Hotel Manager (voice) (uncredited);Wael Zuaiter:Waiter (uncredited)