So Long at the Fair
- taona: 1950
- Firenena: United Kingdom
- Genre: Mystery, Thriller, Drama
- Studio: Gainsborough Pictures
- Keyword: hotel, paris, france, based on novel or book, disappearance, hidden room, 19th century, paris expo, vanished man, brother sister relationship
- tale: Antony Darnborough, Terence Fisher
- Cast: Jean Simmons, Dirk Bogarde, David Tomlinson, Marcel Poncin, Cathleen Nesbitt, Honor Blackman