Eye of the Devil, also known by its working title 13 or Thirteen, is a 1966 British mystery horror film directed by J. Lee Thompson and starring Deborah Kerr, David Niven, Donald Pleasence and Sharon Tate. Adapted from the 1964 novel Day of the Arrow by Philip Loraine, the movie is set in rural France. It was shot at the Château de Hautefort and in England. The film's plot concerns a family inheritance of an estate shrouded by a mysterious and highly ritualistic veil of secrets, and the investigation that follows in trying to uncover the meaning of these ominous peculiarities.

The film was not a commercial success upon release but is considered by some to have obtained a cult status of sorts.