Olsze is a village in the administrative district of Gmina Morzeszczyn, within Tczew County, Pomeranian Voivodeship, in northern Poland. It lies approximately 5 kilometres (3 mi) north-west of Morzeszczyn, 28 km (17 mi) south of Tczew, and 57 km (35 mi) south of the regional capital Gdańsk.