Gmina Grodzisk is a rural gmina (administrative district) in Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland. Its seat is the village of Grodzisk, which lies approximately north-west of Siemiatycze and south-west of the regional capital Biaà Âystok.
The gmina covers an area of , and as of 2006 its total population is 4,596.
Gmina Grodzisk contains the villages and settlements of:
Gmina Grodzisk is bordered by the gminas of Braà Âsk, Ciechanowiec, Drohiczyn, Dziadkowice, Perlejewo, Rudka and Siemiatycze.
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