The 27th Day is a 1957 science fiction film from Columbia Pictures. It was directed by William Asher, produced by Helen Ainsworth, and the screenplay was written by John Mantley, who also wrote the original story. The cast includes Gene Barry and Valerie French.

This was a low budget film with few special effects and little action. Instead the story focuses on dialogue. It was filmed in black and white, and runs for 75 minutes.

Five individuals from five nations, including the "Superpowers," USA, USSR, and China, suddenly find themselves on an alien spacecraft. An alien gives each a container holding capsules. No power on earth can open a given container except a mental command from the person to whom it is given. Each person has been provided with the power of life and death. Any of these individuals has the capability to instantaneously launch the capsules to whatever coordinates he/she chooses, and each capsule will then eradicate all human life within a 3,000-mile radius of its designated location. Written by Craig Chilton