John Murphy (born 4 March 1965) is a British film composer. He is a self-taught multi-instrumental musician who began his career in the 1980s, working with The Lotus Eaters, Thomas Lang, and Claudia Brücken. He has collaborated with directors Danny Boyle, Guy Ritchie, Michael Mann, Matthew Vaughn, Stephen Frears, and James Gunn.

Murphy gained recognition in the film industry while working with Guy Ritchie on his film Lock, Stock and Two Smoking Barrels, Michael Mann's Miami Vice, Matthew Vaughn's Kick-Ass and scoring various films by Danny Boyle. His instrumental tracks "In the House – In a Heartbeat" from 28 Days Later and "Adagio in D Minor" from Sunshine have been featured in a variety of TV shows, commercials and film trailers.