Darling Lili is a 1970 American romantic-musical spy film, written by William Peter Blatty and Blake Edwards, the latter also directing the film. It stars Julie Andrews, Rock Hudson, and Jeremy Kemp, with music by Henry Mancini and lyrics by Johnny Mercer. This was the last full musical to have song lyrics written by Mercer.

William Peter Blatty was an American writer, director and producer. He is best known for his 1971 novel, The Exorcist, and for his 1973 screenplay for the film adaptation of the same name. Blatty won an Academy Award for Best Adapted Screenplay for The Exorcist, and was nominated for Best Picture as its producer. The film also earned Blatty a Golden Globe Award for Best Motion Picture – Drama as producer.