Piotr Haczek is a Polish former athlete who mainly competed in the 400 metres. An outdoor and indoor world champion in the 4 × 400 metres relay, his success came mainly in relay, his best individual performance being a gold medal at the 1999 European Under 23 Championships. After retiring from competition he became an athletics coach: among the roles he has held are sports director and head coach of the Polish Athletic Association and sprints coach for Scottish Athletics.