Gromadzin [ɡrɔˈmad͡ʑin] is a village in the administrative district of Gmina Przywidz, within Gdańsk County, Pomeranian Voivodeship, in northern Poland. It lies approximately 2 kilometres (1 mi) east of Przywidz, 20 km (12 mi) west of Pruszcz Gdański, and 27 km (17 mi) south-west of the regional capital Gdańsk.

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