"Crescent Moon" is the fifth episode of the first series of the 1960s British spy-fi television series The Avengers, starring Ian Hendry, Patrick Macnee and Ingrid Hafner, and guest starring Patience Collier, Roger Delgado, Harold Kasket, and . It was performed and aired live on ABC on 4 February 1961, and is one of many Season 1 episodes that as of 2012 is considered lost. The episode was directed by , and written by and .