Grzywnik [ˈɡʐɨvnik] is a village in the administrative district of Gmina Borne Sulinowo, within Szczecinek County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 10 kilometres (6 mi) north of Borne Sulinowo, 10 km (6 mi) south-west of Szczecinek, and 135 km (84 mi) east of the regional capital Szczecin.

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

The village has a population of 20.