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 20 kilometres (12 mi) south-east of Otwock and 40 km (25 mi) south-east of Warsaw.
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The gmina covers an area of 67.5 square kilometres (26.1 sq mi), and as of 2006 its total population is 3,436.