John Glenn Grimsley (February 25, 1962 – February 6, 2008) was an American linebacker in the National Football League who played for seven seasons for the Houston Oilers. Grimsley was born in Canton, Ohio, where he graduated from McKinley High School. He played college football at Kentucky under coach Jerry Claiborne. Grimsley was selected to the Pro Bowl after the 1988 season. In 1991, he was traded to the Miami Dolphins and stayed there until he retired in 1993.