Kwidzyn (Polish pronunciation: [ˈkfʲid͡zɨn]; German: Marienwerder; Prussian: Kwēdina) is a town in northern Poland on the Liwa river in the Powiśle (right bank of Vistula) region, with 40,008 inhabitants (2004). It has been a part of the Pomeranian Voivodeship since 1999, and was previously in the Elbląg Voivodeship (1975–1998).