Letter from an Unknown Woman

Joan Fontaine

Lisa Berndle

Louis Jourdan

Stefan Brand

Mady Christians

Frau Berndle

Marcel Journet

Johann Stauffer

Art Smith

John

Carol Yorke

Marie

Howard Freeman

Herr Kastner

John Good

Lt. Leopold von Kaltnegger

Leo B. Pessin

Stefan Jr.

Erskine Sanford

Porter

Otto Waldis

Concierge

Sonja Bryden

Frau Spitzer

Patricia Alphin

Pretty Girl (uncredited)

Harry Anderson

Minor Role (uncredited)

Edit Angold

Middle-Aged Woman (uncredited)

Betty Blythe

Frau Kohner (uncredited)

Gabrielle Windsor

Ballet Girl (uncredited)

June Wood

Cashier (uncredited)