Sarnówko [sarˈnufkɔ] is a settlement in the administrative district of Gmina Kartuzy, within Kartuzy County, Pomeranian Voivodeship, in northern Poland. It lies approximately 9 kilometres (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.