The Lost Weekend
- Release Date: November 16, 1945
- Genre: Drama
- Director: Billy Wilder
- Producer(s): Charles Brackett
- Writer(s): Charles Brackett, Billy Wilder
- Studio: Paramount Pictures
- Length: 1h 41m
Cast
as Don Birnam
as Helen St. James
Phillip Terry
as Wick Birnam
Howard Da Silva
as Nat the Bartender
Doris Dowling
as Gloria
Frank Faylen
as `Bim" Nolan, Male Nurse
Mary Young
as Mrs. Deveridge
Lewis Russell
as Charles St. James
Frank Orth
as Opera Attendant
Gisela Werbiseck
as Mrs. Wertheim (uncredited)
Eddie Laughton
as Mr. Brophy, Liquor Store Owner (uncredited)
Harry Barris
as Piano Player (uncredited)
Jayne Hazard
as M.M. (uncredited)
Craig Reynolds
as George (uncredited)
Fred Toones
as Washroom Attendant (uncredited)
Helen Dickson
as Mrs. Frink (uncredited)
David Clyde
as Dave, Janitor (uncredited)
Pat Moriarity
as Irishman (uncredited)
William O'Leary
as Irishman (uncredited)