Den 27:e dagen
- År: 1957
- Land: United States of America
- Genre: Science Fiction
- Studio: Romson Productions, Columbia Pictures
- Nyckelord: flying saucer, decision, alien, alien weapon
- Direktör: William Asher
- Kasta: Gene Barry, Valerie French, George Voskovec, Azemat Janti, Stefan Schnabel, Friedrich von Ledebur