"When a recently fired policeman falls in love with a French prostitute, he doesn't want her to be with other men, so he creates an alter-ego in order to become her only customer."
Shirley MacLaine
as Irma La Douce
Jack Lemmon
as Nestor Patou
Lou Jacobi
as Moustache
Bruce Yarnell
as Hippolyte
Herschel Bernardi
as Inspector Lefevre
Hope Holiday
as Lolita
Joan Shawlee
as Amazon Annie
Grace Lee Whitney
as Kiki
Paul Dubov
as Andre
Howard McNear
as Concierge
Cliff Osmond
as Police Sergeant
Diki Lerner
as Jojo
Herb Jones
as Casablanca Charlie
Ruth Earl
as Zebra Twin
Jane Earl
Tura Satana
as Suzette Wong
Lou Krugman
as Customer #1
James Brown
as Texan Customer
Bill Bixby
as Tattooed Sailor
John Alvin
as Customer #2
Susan Woods
as Poule with Balcony
De De Young
as Mimi the MauMau
Sheryl Deauville
as Carmen
Billy Beck
as Officer Dupont
Jack Sahakian
as Jack
James Caan
as Soldier with Radio (uncredited)
Billy Wilder
Director
Screenplay
I. A. L. Diamond
Producer
Edward L. Alperson
Doane Harrison
Alexandre Trauner
André Previn
Original Music Composer
Joseph LaShelle
Director of Photography
Daniel Mandell
Editor
Orry-Kelly
Costume Design
Alexandre Breffort
Author
Lynn Stalmaster
Casting
Art Direction
Production Design