Number Six is the central character in the 1967–1968 television series The Prisoner. The unnamed character in the original TV series was played by series co-creator Patrick McGoohan. For one episode, "Do Not Forsake Me Oh My Darling", Number Six was portrayed by Nigel Stock due to McGoohan being away filming the movie Ice Station Zebra.

The Prisoner is a British television series created by Patrick McGoohan, with possible contributions from George Markstein. McGoohan portrays Number Six, an unnamed British intelligence agent who is abducted and imprisoned in a mysterious coastal village after resigning from his position. The allegorical plotlines of the series contain elements of science fiction, psychological drama, and spy fiction. It was produced by Everyman Films for distribution by Lew Grade's ITC Entertainment.