Dłużyna [dwuˈʐɨna] (German Marienaue) is a village in the administrative district of Gmina Banie, within Gryfino County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 3 kilometres (2 mi) east of Banie, 23 km (14 mi) south-east of Gryfino, and 37 km (23 mi) south of the regional capital Szczecin.

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