Rosnowo [rɔsˈnɔvɔ] (formerly German Roßnow) is a village in the administrative district of Gmina Manowo, within Koszalin County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 6 kilometres (4 mi) south of Manowo, 15 km (9 mi) south-east of Koszalin, and 135 km (84 mi) north-east of the regional capital Szczecin.

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

The village has a population of 2,300.