Grzelak is a Polish surname, it may refer to:
- Bartłomiej Grzelak, Polish footballer
- Bartosz Grzelak, Polish-Swedish football player and manager
- Klaudia Grzelak, Polish volleyball player
- Mikołaj Grzelak, Polish footballer
- Rafał Grzelak, Polish footballer
- Rafał Grzelak (born 1988), Polish footballer
- Stanisław Grzelak, Polish cyclist
- Tadeusz Grzelak, Polish boxer
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