John B. Hart was an American football player and coach. The Yale University graduate served as head coach of the University of Texas at Austin in 1902. He holds a 6–3–1 record at Texas. At 5 ft 5 in (1.65 m) and weighing 130 pounds (59 kg; 9.3 st) Hart was one of the smallest backs Yale ever had. Hart had to leave Texas after a 12–0 loss to Texas A&M.