Louis Hayward as Simon Templar

Naomi Chance as Carol Denby

Sydney Tafler as Max Lennar

Charles Victor as Chief Insp. Claud Teal

Jane Carr as Kate Finch

Harold Lang as Jarvis

William Russell as Keith Merton

Diana Dors as The Blonde in Lennar's Apartment

Fred Johnson as Irish Cassidy

Thomas Gallagher as Hoppy Uniatz

Russell Napier as Col. Stafford

Sam Kydd as Barkley

John Wynn as Man

George Margo as Lennar's Henchman

Ian Fleming as Lord Merton

Ernest Blyth as Party Guest (uncredited)

Erik Chitty as Older gang member (uncredited)

Jack Mandeville as Party Guest (uncredited)

Bunny Seaman as Gambler (uncredited)

Ian Selby as Gambler (uncredited)

John Smart as Merton Party Guest (uncredited)

Harry Van Engel as Safari Club patron (uncredited)

Ian Wilson as Man Waiting for Telephone Booth (uncredited)