Juan Castillo (born October 8, 1959) is an American football coach. He was defensive coordinator for the Philadelphia Eagles of the National Football League from February 2, 2011 to October 16, 2012 when he was fired. He played college football at Texas A&I as a linebacker. He played for the San Antonio Gunslingers of the United States Football League from 1984–1985. He joined the Eagles in 1995 as an offensive assistant. He was promoted to tight ends coach in 1997, and switched to offensive line coach in 1998.