Sierzywk [ˈɕɛʐɨfk] is a settlement in the administrative district of Gmina Lipnica, within Bytów County, Pomeranian Voivodeship, in northern Poland. It lies approximately 5 kilometres (3 mi) north-east of Lipnica, 13 km (8 mi) south of Bytów, and 86 km (53 mi) south-west of the regional capital Gdańsk.

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