Sielsko is a village in the administrative district of Gmina Węgorzyno, within Łobez County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 9 kilometres north-west of Węgorzyno, 12 km south-west of Łobez, and 62 km east of the regional capital Szczecin. Before 1945 the area was part of Germany. For the history of the region, see History of Pomerania.