- Country: USA
- Genres: Comedy, Romance
- Release: 1934-05-18
- Director: Marion Gering
- Writers: Preston Sturges , Frank Partos , Sam Hellman , Edwin Justus Mayer , Clarence Budington Kelland
- Language: English
- Stars: Sylvia Sidney , Cary Grant , Edward Arnold (I) (1890–1956) , Henry Stephenson (1871–1956)
- Runtime: 74 min
- Awards: N/A
- AKA: Prinzessin für dreissig Tage (Austria) , El precio de un trono (Mexico) , 30 Dias Princesa (Portugal, Portuguese Republic) , Prinţesă pentru o lună (Romania) , Księżniczka przez trzydzieści dni (Poland) , Pünkösdi hercegnő (Hungary) , Πριγκίπισσα για 30 ημέρες (Greece) , Princesa por um Mês (Brazil) , Thirty Day Princess (United Kingdom) , Prigipissa gia 30 imeres (Greece) , Принцесса на тридцать дней , Princesa por un mes (Spain) , Princesse par intérim (France, French Republic) , Thirty Day Princess (United States of America) , 三日姫君 (Japan) , Thirty Day Princess
- Plot: A Princess who arrives in the United States of America from Taronia on a good will tour to raise money for her people develops the mumps and needs to quarantine for 30 days while an actress doppelgänger plays her role. Starring Sylvia Sidney and Cary Grant during the Golden days of Hollywood's black and white movies.
- IMDB:tt0025880
Thirty Day Princess Cast · · · ALL
Marion Gering
Director
Sylvia Sidney
Nancy Lane / Princess Catterina
Cary Grant
Porter Madison III
Edward Arnold
(I)
(1890–1956)
Richard M. Gresham
Henry Stephenson
(1871–1956)
King Anatol XII
Vince Barnett
Count Nicholeus
Edgar Norton
Baron Passeria
Ray Walker
Dan Kirk
Lucien Littlefield
Parker
Robert McWade
(I)
(1872–1938)
Managing Editor
George Baxter
Donald Spottswood
Marguerite Namara
Lady in Waiting