Łubna [ˈwubna] is a village in the administrative district of Gmina Góra Kalwaria, within Piaseczno County, Masovian Voivodeship, in east-central Poland. It lies approximately 9 kilometres (6 mi) north-west of Góra Kalwaria, 9 km (6 mi) south-east of Piaseczno, and 23 km (14 mi) south-east of Warsaw.