Piątkowo [pjɔntˈkɔvɔ] is a settlement in the administrative district of Gmina Karsin, within Kościerzyna County, Pomeranian Voivodeship, in northern Poland. It lies approximately 7 kilometres (4 mi) west of Karsin, 25 km (16 mi) south-west of Kościerzyna, and 73 km (45 mi) south-west of the regional capital Gdańsk.

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