Dłużek [ˈdwuʐɛk] is a village in the administrative district of Gmina Lubsko, within Żary County, Lubusz Voivodeship, in western Poland. It lies approximately 3 kilometres (2 mi) south-west of Lubsko, 21 km (13 mi) north-west of Żary, and 44 km (27 mi) south-west of Zielona Góra.

Notable residents

• Ernst Gunther, Duke of Schleswig-Holstein (1863-1921)
• Augusta Victoria of Schleswig-Holstein (1858-1921), last German Empress