Gruzka is a village in the administrative district of Gmina Kleszczele, within Hajnówka County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Belarus.
According to the 1921 census, the village was inhabited by 76 people, among whom 73 Orthodox, and 3 Mosaic. At the same time, 73 inhabitants declared Belarusian nationality, and 3 Jewish. There were 13 residential buildings in the village.Skorowidz miejscowości Rzeczypospolitej Polskiej: opracowany na podstawie wyników pierwszego powszechnego spisu ludności z dn. 30 września 1921 r. i innych źródeł urzędowych., t. T. 5, województwo białostockie, 1924, p. 22.
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