Billy Dannreuther
Humphrey Bogart
Billy Dannreuther
Peter Sellers
Mrs. Gwendolen Chelm
Jennifer Jones
Maria Dannreuther
Gina Lollobrigida
Peterson (crook No. 1)
Robert Morley
Julius O'Hara (crook No. 2)
Peter Lorre
Harry Chelm
Edward Underdown
Maj. Jack Ross (crook No. 3; aka The Galloping Major)
Ivor Barnard
Ravello (crook No. 4)
Marco Tulli
Purser
Marion Perroni
Purser, SS Nyanga
Mario Perrone
Hotel manager (uncredited)
Alex Pochet
Insp. Jack Clayton
Bernard Lee
Charles (restaurant owner)
Aldo Silvani
Administrator
Giulio Donnini
Captain of SS Nyanga
Saro Urzì
Hispano-Suiza Driver
Juan de Landa
Manuel Serano
Mimo Peli
Ahmed (uncredited)
Manuel Serrano
Julie Gibson
Barman
Mimmo Poli