Grzegorz Masternak (born 2 April 1970) is a Polish chess International Master (1996).

Masternak is a two-time medallist of the Polish Junior Chess Championships.

In 1993, he won the international chess Swiss-system tournament in Chorzów.

Masternak reached his career highest rating on 1 July 1995, with a score of 2395 points, and was then 30th -37th place among Polish chess players.

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