Gina Lollobrigida as Maria Marcello

Sean Connery as Anthony Richmond

Ralph Richardson as Charles Richmond

Alexander Knox as Detective Inspector Lomer

Johnny Sekka as Thomas

Peter Madden as Yacht Captain

Danny Daniels as Fenton

Laurence Hardy as Baines

Michael Goodliffe as Solicitor

André Morell as Judge

Noel Howlett as Assistant Solicitor

Douglas Wilmer as Dr. Murray

A. J. Brown as Third Executive (uncredited)

Robert Bruce as John (uncredited)

Georgina Cookson as Guest at Villa Salon (uncredited)

Michael Corcoran as The Cook (uncredited)

George Curzon as Second Executive (uncredited)

Gilda Dahlberg as Guest at Villa Salon (uncredited)