Harlon T. Barnett (born January 2, 1967) is an American football coach and former player. Barnett previously served as Associate Head Coach/Co-Defensive Coordinator at Michigan State University as well as Defensive Coordinator/Defensive Backs Coach at Florida State University. He currently serves as the Secondary Coach at Michigan State University. As a player, Barnett was a four-year letter-winner as a defensive back for Michigan State University, serving as team captain and earning All-America honors during his senior year, and spent seven seasons in the National Football League.