Audrey Hepburn as Nicole Bonnet

Peter O'Toole as Simon Dermott

Eli Wallach as Davis Leland

Hugh Griffith as Charles Bonnet

Charles Boyer as Bernard De Solnay

Fernand Gravey as Grammont

Marcel Dalio as Senior Paravideo

Jacques Marin as Chief Guard

Moustache as Guard

Roger Tréville as Auctioneer

Edward Malin as Insurance Clerk

Bert Bertram as Marcel

Georg Stanford Brown as Waiter (uncredited)

Louise Chevalier as Cleaning Woman (uncredited)

Rémy Longa as Young Man (uncredited)

Pierre Mirat as Guard (uncredited)

Jacques Ramade as Guard (uncredited)

Leoda Richards as Lady in Ritz Hotel Bar (uncredited)

Olga Valéry as Lady with dog (uncredited)