William Ross (born 1948), is an American composer, orchestrator, arranger, conductor and music director. He has worked with a large array of artists and musicians, from famous Hollywood composers John Williams, Alan Silvestri, John Powell, Michael Giacchino, Klaus Badelt, or Michael Kamen, to pop music icons and best-sellers such as Barbra Streisand, Celine Dion, Andrea Bocelli, Josh Groban, Whitney Houston, Kenny G, Michael Jackson, David Foster, Quincy Jones, Babyface and Sting.

Ross has composed the soundtrack for films such as Tuck Everlasting, My Dog Skip and Ladder 49. He adapted and conducted John Williams's themes for Harry Potter and the Chamber of Secrets. In 2008, he scored the CGI-film The Tale of Despereaux, from Universal Studios.