John Loves Mary is a 1949 comedy film directed by David Butler and written by Henry Ephron and Phoebe Ephron. The film stars Ronald Reagan, Patricia Neal and Jack Carson. The film was released by Warner Bros. on February 19, 1949. It's based on a Broadway play of the same name written by Norman Krasna, which ran from February 4, 1947, to February 7, 1948, at the Booth Theatre and Music Box Theatre in New York City.