Cetuń (German Zetthun) is a village in the administrative district of Gmina Polanów, within Koszalin County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately west of Polanów (Pollnow), south-east of Koszalin (Köslin), and north-east of the regional capital Szczecin (Stettin).
Before 1945 the area was part of Germany. For the history of the region, see History of Pomerania.
The village has a population of 230.