Osiek [ˈɔɕɛk] is a village in Starogard County, Pomeranian Voivodeship, in northern Poland. It is the seat of the gmina (administrative district) called Gmina Osiek. It lies approximately 28 kilometres (17 mi) south of Starogard Gdański and 73 km (45 mi) south of the regional capital Gdańsk.

For details of the history of the region, see History of Pomerania.