John Joseph Hayes was an American athlete, a member of the Irish American Athletic Club, and winner of the marathon race at the 1908 Summer Olympics. Hayes' Olympic victory contributed to the early growth of long-distance running and marathoning in the United States. He was also the first man to win a marathon at the now official standard distance of 26 miles 385 yards when Olympic officials lengthened the distance to put the finish line in front of the Royal Box.