Jeziornik [jɛˈʑɔrnik] is a settlement in the administrative district of Gmina Zblewo, within Starogard County, Pomeranian Voivodeship, in northern Poland. It lies approximately 7 kilometres (4 mi) south-east of Zblewo, 14 km (9 mi) south-west of Starogard Gdański, and 56 km (35 mi) south of the regional capital Gdańsk.

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