John Treacy is an Irish long-distance runner born on June 14, 1960, in Tullamore, Ireland. He is best known for his achievements in the 1980s, particularly in the marathon and cross-country events. Treacy won a silver medal in the marathon at the 1984 Summer Olympics in Los Angeles and has multiple titles in the European Cross Country Championships. In addition to his Olympic success, Treacy has set several national records and is celebrated for his contributions to athletics in Ireland. After retiring from competitive running, he became involved in sports administration and coaching, promoting physical fitness and encouraging young athletes.