Grzegorz Witold Kleszcz (born 12 November 1977 in Oława) is a Polish weightlifter.

[1] He is a three-time Olympian and a bronze medalist for the super heavyweight class at the 2001 European Weightlifting Championships in Trenčín, Slovakia.

[2] Kleszcz made his official debut for the 2000 Summer Olympics in Sydney, where he hauled 405 kilograms in total for an eighth-place finish in the men's heavyweight class (105 kg).

At the 2004 Summer Olympics in Athens, Kleszcz switched to a heavier class by competing this time in the +105 kg category.

At the 2008 Summer Olympics in Beijing, Kleszcz competed for his second time in the men's +105 kg class.