 Peter SellersRobert Danvers | Robert Danvers |
 Goldie HawnMarion | Marion |
 Tony BrittonAndrew Hunter | Andrew Hunter |
 Nicky HensonJimmy | Jimmy |
 Diana DorsJohn's Wife | John's Wife |
 Judy CampbellLady Heather | Lady Heather |
 Gabrielle DrakeJulia Halforde-Smythe | Julia Halforde-Smythe |
 Nicola PagettClaire the Bride | Claire the Bride |
| GGeraldine ShermanCaroline | Caroline |
 Thorley WaltersManager of Carlton Hotel | Manager of Carlton Hotel |
 Ruth TrouncerGilly Hunter | Gilly Hunter |
 Françoise PascalPaola | Paola |
| TTom MarshallBryan | Bryan |
 Raf De La TorreMonsieur Le Guestier | Monsieur Le Guestier |
 Marianne StoneReporter | Reporter |
 John ComerJohn, the porter | John, the porter |
 Robin ParkinsonLe reporter aux lunettes | Le reporter aux lunettes |
 Constantine GregoryMichel Le Guestier | Michel Le Guestier |
 Avril AngersEnglish Tourist in Lift | English Tourist in Lift |
| GGeorges LambertFloor Waiter | Floor Waiter |
 Margaret LaceyAutograph Hunter at Wedding | Autograph Hunter at Wedding |
| JJack ArmstrongWedding Guest (uncredited) | Wedding Guest (uncredited) |
 Eric BarkerWedding Guest (uncredited) | Wedding Guest (uncredited) |
| EErnest BlythWedding Guest (uncredited) | Wedding Guest (uncredited) |
 Christopher CazenoveNigel (uncredited) | Nigel (uncredited) |
 Andre CharisseConcierge (uncredited) | Concierge (uncredited) |
 Mark DignamWedding Guest (uncredited) | Wedding Guest (uncredited) |
| HHugh EltonPhotographer (uncredited) | Photographer (uncredited) |
| MMabel EtheringtonWedding Guest (uncredited) | Wedding Guest (uncredited) |
| MMuriel GreensladeWedding Guest (uncredited) | Wedding Guest (uncredited) |
