John Du Prez (born Trevor Jones; 14 December 1946) is a British musician, conductor and composer. He was a member of the 1980s salsa-driven pop band Modern Romance and has since written several film scores including Oxford Blues (1984), Once Bitten, Teenage Mutant Ninja Turtles (1990), and the final Carry On film, Carry On Columbus (1992). He contributed to The Wild (2006) soundtrack.

He is also known for his extensive collaborations with Monty Python, having worked on several films and shows by members of the troupe, including composing, conducting, and arranging for Monty Python’s Life of Brian (1979), Time Bandits (1981), Monty Python Live at the Hollywood Bowl (both 1982), Monty Python's The Meaning of Life (1983), A Private Function (1984), A Fish Called Wanda (1988), The Wind in the Willows (1996), Spamalot (2004), Not the Messiah (He's a Very Naughty Boy) (2010), and Monty Python Live (Mostly) (2014). For his work on Spamalot, which ran 1,575 performances on Broadway, he was nominated for the Tony Award for Best Original Score.