Kętrzyno [kɛnˈtʂɨnɔ] is a village in the administrative district of Gmina Linia, within Wejherowo County, Pomeranian Voivodeship, in northern Poland. It lies approximately 5 kilometres (3 mi) north of Linia, 24 km (15 mi) south-west of Wejherowo, and 47 km (29 mi) west of the regional capital Gdańsk.

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