Jay Gruska (; born April 23, 1952) is an American songwriter and composer best known for his film and television scoring, and for writing hit songs for a variety of artists. He has composed musical scores for dozens of TV dramas, with over 500 hours of shows played internationally. Gruska has received three Emmy Award nominations, one Genie Award nomination, and nine ASCAP awards. Some of his best-known scores are for the TV shows Lois & Clark: The New Adventures of Superman, Charmed, and Supernatural.