Ostowo [ɔsˈtɔvɔ] is a settlement in the administrative district of Gmina Somonino, within Kartuzy County, Pomeranian Voivodeship, in northern Poland. It lies approximately 7 kilometres (4 mi) west of Somonino, 10 km (6 mi) south-west of Kartuzy, and 36 km (22 mi) west of the regional capital Gdańsk.

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