The 27th Day is a 1957 American black-and-white science fiction film, distributed by Columbia Pictures. It was produced by Helen Ainsworth, directed by William Asher, and stars Gene Barry, Valerie French, George Voskovec, and Arnold Moss. The screenplay by John Mantley is based on his 1956 original science fiction novel of the same name.

William Milton Asher was an American television and film producer, film director, and screenwriter. He was one of the most prolific early television directors, producing or directing over two dozen series.