Błotnia is a village in the administrative district of Gmina Trąbki Wielkie, within Gdańsk County, Pomeranian Voivodeship, in northern Poland. It lies approximately west of Trąbki Wielkie, south-west of Pruszcz Gdański, and south-west of the regional capital Gdańsk. The name of Błotnia was Braunsdorf (County Danzig, Free City of Danzig) till the end of World War II.
