Gmina Osieck is an urban-rural gmina (administrative district) in Otwock County, Masovian Voivodeship, in east-central Poland. Its seat is the town of Osieck, which lies approximately south-east of Otwock and south-east of Warsaw. n The gmina covers an area of , and as of 2006 its total population is 3,436.
The gmina contains part of the protected area called Masovian Landscape Park.
Apart from the town of Osieck, Gmina Osieck contains the villages and settlements of Augustówka, Czarnowiec, Górki, Grabianka, Kolonia Osieck, Kolonia Pogorzel, Lipiny, Natolin, Nowe Koà Âcieliska, Pogorzel, Rudnik, Sobieà Âki, Stare Koà Âcieliska and Wójtowizna.
Gmina Osieck is bordered by the gminas of Celestynów, Garwolin, Koà Âbiel, Pilawa and Sobienie-Jeziory.
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