John Cardon Debney (born August 18, 1956) is an American composer and conductor of film, television, and video game scores. His work encompasses a variety of mediums and genres, including comedy, horror, science fiction, thriller, fantasy, and action-adventure. He is a long-time collaborator of The Walt Disney Company, having written music for their films, television series, and theme parks. He has also collaborated with film directors such as Jon Favreau, Garry Marshall, Tom Shadyac, Peter Hyams, John A. Davis, Brad Anderson, Howard Deutch, Mark Dindal, Robert Rodriguez, and Paul Tibbitt.

Debney has been the recipient of three Primetime Emmy Awards and an Academy Award nomination for his score for Mel Gibson's The Passion of the Christ (2004).