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Ostaszewo [ɔstaˈʂɛvɔ] is a village in Nowy Dwór Gdański County, Pomeranian Voivodeship, in northern Poland. It is the seat of the gmina (administrative district) called Gmina Ostaszewo. It lies approximately 12 kilometres (7 mi) west of Nowy Dwór Gdański and 27 km (17 mi) south-east of the regional capital Gdańsk.
The village has a population of 1,017.