Thomas Patrick Mullen (born November 11, 1951) is a former American football offensive lineman who played five seasons in the National Football League with the New York Giants and St. Louis Cardinals. He was drafted by the New York Giants in the second round of the 1974 NFL Draft. He played college football at Southwest Missouri State University and attended St. John Vianney High School in Kirkwood, Missouri. Mullen is a brother of Sigma Phi Epsilon fraternity.