Adger Armstrong Jr. (born June 21, 1957) is an American former professional football player who was a fullback in the National Football League (NFL). He played college football for the Texas A&M Aggies. He was signed by the Dallas Cowboys as an undrafted free agent in 1979. He played for the Houston Oilers until 1982, and he played for the Tampa Bay Buccaneers from 1983 to 1985.