Marvin Allen Upshaw (born November 22, 1946 in Robstown, Texas) is a former American football defensive lineman in the National Football League. He played nine seasons for the Cleveland Browns (1968–1969), the Kansas City Chiefs (1970–1975) and the St. Louis Cardinals (1976). He is the younger brother of the late Gene Upshaw, who was an offensive lineman for the Oakland Raiders, executive director of the National Football League Players' Association (NFLPA) after retiring as an active player, and a member of the Pro Football Hall of Fame.