Stephen Christopher Spagnuolo (; born December 21, 1959) is an American football coach who is the defensive coordinator for the Kansas City Chiefs of the National Football League (NFL). He rejoined Andy Reid after being a defensive assistant with him from 1999 to 2006. Spagnuolo has won two Super Bowls as defensive coordinator, one with the New York Giants and one with the Kansas City Chiefs. Spagnuolo is the only offensive or defensive coordinator in NFL history to win a Super Bowl with two different franchises.