Mikoszewo is a village in the administrative district of Gmina Stegna, within Nowy Dwór Gdański County, Pomeranian Voivodeship, in northern Poland. It lies approximately 17 kilometres north-west of Nowy Dwór Gdański and 22 km east of the regional capital Gdańsk. Mikoszewo is where the longest Polish river, Vistula, empties into the Baltic Sea. It is located within the historic region of Pomerania.