Forst (Lausitz) (German) or Baršć (Łužyca) (Lower Sorbian, pronounced [ˈbarɕtɕ ˈwuʒɨtsa]) is a town in Lower Lusatia, Brandenburg, in eastern Germany. It lies east of Cottbus, on the Lusatian Neisse river which is also the German-Polish border. It is the capital of the Spree-Neiße district. It is known for its rose garden and textile museum. The town's population is 18,651. In Forst, there is a railway bridge across the Neiße belonging to the line Cottbus–Żary which is serviced by regional trains and a EuroCity train between Hamburg and Kraków (2011). There is also a road bridge across the river north of Forst.

Lower Lusatia is a historical region in Central Europe, stretching from the southeast of the German state of Brandenburg to the southwest of Lubusz Voivodeship in Poland. Like adjacent Upper Lusatia in the south, Lower Lusatia is a settlement area of the West Slavic Sorbs whose endangered Lower Sorbian language is related to Upper Sorbian and Polish.