James Coburn as John Cunningham

Lee Remick as Sheila Metcalfe

Lilli Palmer as Adrianne

Burgess Meredith as Ramsey Williams

Patrick Magee as Alexi

Sterling Hayden as Michael Carlson

Claude Dauphin as Maurice

Helen Cherry as Evelyn Carlson

Karen Black as Ellen

Sabine Sun as Belgian Prostitute

Dominique Davray as Barmaid (uncredited)

Allen Emerson as Slick Haired Men (uncredited)

Laura Hale as Asst. in Stock Exchange (uncredited)

Diane Myles as Voting Booth Clerk (uncredited)

Jo Nupie as Flemish lady (uncredited)

Hedy Scott as Voting Booth Clerk (uncredited)

Bea Thompkins as Voting Booth Clerk (uncredited)