Piotr Haczek (born 26 January 1977 in Żywiec, Śląskie) is a Polish former athlete who mainly competed in the 400 metres.

An outdoor and indoor world champion in the 4 x 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.

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