Douglas Claydon Van Horn (born June 24, 1944) is an American former professional football player who was an offensive lineman in the National Football League (NFL) for the Detroit Lions and New York Giants. He played college football for the Ohio State Buckeyes, earning first-team All-American honors in 1965. Van Horn was selected in the fourth round of the 1966 NFL draft. He was also selected in the fifth round of the 1966 AFL Draft by the Kansas City Chiefs. He earned the Giants starting right guard spot in 1969, playing in that role until he was switched to right tackle in 1974.