Płonka [ˈpwɔnka] is a settlement in the administrative district of Gmina Sianów, within Koszalin County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 6 kilometres (4 mi) north-east of Sianów, 15 km (9 mi) north-east of Koszalin, and 151 km (94 mi) north-east of the regional capital Szczecin.