Deka [ˈdɛka] is a village in the administrative district of Gmina Liniewo, within Kościerzyna County, Pomeranian Voivodeship, in northern Poland. It lies approximately 8 kilometres (5 mi) east of Liniewo, 25 km (16 mi) east of Kościerzyna, and 40 km (25 mi) south-west of the regional capital Gdańsk.

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