Billy Liar is a 1963 British CinemaScope comedy-drama film based on the 1959 novel by Keith Waterhouse. Directed by John Schlesinger, it stars Tom Courtenay as Billy and Julie Christie as Liz, one of his three girlfriends. Mona Washbourne plays Mrs. Fisher and Wilfred Pickles plays Mr. Fisher. Rodney Bewes, Finlay Currie and Leonard Rossiter also feature. The Cinemascope photography is by Denys Coop and Richard Rodney Bennett supplied the score.

Billy Liar is a 1959 novel by Keith Waterhouse that was later adapted into a play, a film, a musical and a TV series. The work has inspired and been featured in a number of popular songs.