Jack Lemmon
Wendell Armbruster, Jr.

Juliet Mills
Pamela Piggott

Clive Revill
Carlo Carlucci

Edward Andrews
J.J. Blodgett

Gianfranco Barra
Bruno

Franco Angrisano
Arnoldo Trotta

Pippo Franco
Mattarazzo

Giselda Castrini
Anna

Giacomo Rizzo
Barman

Antonino Faà di Bruno
Concierge (as Antonino Faa' Di Bruno)

Yanti Somer
Nurse (as Yanti Sommer)

Janet Ågren
Nurse

Aldo Rendine
Rossi

Bruno Alias
Man at Airport (uncredited)

Nestore Cavaricci
Male Nurse (uncredited)

Enrico Cesaretti
Man at Airport (uncredited)

Giorgio Dolfin
Waiter (uncredited)

Ferruccio Fregonese
Man at Aiport (uncredited)

Ettore Geri
Airplane Passenger (uncredited)

Ty Hardin
Helicopter Pilot (uncredited)

Margherita Horowitz
Hotel Guest (uncredited)

Silvio Klein
Man at Airport (uncredited)

Alba Maiolini
Woman at Airport (uncredited)

Giuseppe Marrocco
Commissionaire (uncredited)

Luigi Scavran
Sommelier (uncredited)

Pupita Lea Scuderoni
Airline Passenger (uncredited)

Maria Tedeschi
Hotel Guest (uncredited)

Giuseppe Terranova
Commissionaire (uncredited)

Sandra Wolff
Airplane Passenger (uncredited)

Lidia Zanussi
Hotel Guest (uncredited)

Gianni Di Segni
Policeman (uncredited)