Rock Hudson as Robert L. Talbot

Gina Lollobrigida as Lisa Helena Fellini

Sandra Dee as Sandy Stevens

Bobby Darin as Tony

Walter Slezak as Maurice Clavell

Brenda De Banzie as Margaret Allison

Rossana Rory as Anna

Ronald Howard as Spencer

Joel Grey as Beagle

Ronnie Haran as Sparrow

Christopher Seitz as Larry

Cindy Conroy as Julia

Joan Freeman as Linda

Nancy Anderson as Patricia

Michael Eden as Ron

Claudia Brack as Carol

Nello Appodia as Station Master (uncredited)

Liliana Celli as Seamstress (uncredited)

Pietro De Vico as Poliziotto (uncredited)

Liana Del Balzo as Mother Superior (uncredited)

Charles Fawcett as Warren (uncredited)

Betty Foa as Elena (uncredited)

Giacomo Furia as Poliziotto (uncredited)

Anna Maestri as Maria (Maid) (uncredited)

Renato Malavasi as Man (uncredited)

Edy Nogara as Lisa's Maid (uncredited)

Mimmo Poli as Commissario (uncredited)

Stella Rho as Teresa (Maid) (uncredited)

John Stacy as Douglas (uncredited)

Helen Stirling as Katherine (uncredited)

Francesco Tensi as Robert's Secretary (uncredited)

Milena Vukotić as Melinda (Maid) (uncredited)