Romy Schneider

as Kitty Dupont

Karlheinz Böhm

as Robert Ashlin

O.E. Hasse

as Sir William Ashlin

Ernst Schröder

as Crawford, Sekretär der britischen Delegation

Paul Dahlke

as Henry Dupont

Alice Treff

as Luise Dupont

Peer Schmidt

as Boris Malewski