Lusatia is a historical region in Central Europe. It stretches from the Bóbr and Kwisa rivers in the east to the Elbe valley in the west, today located within the German states of Saxony and Brandenburg as well as in the Lower Silesian and Lubusz voivodeships of western Poland. After the conquest of Eastern Germany by the Soviet Army and the partition in 1945, the eastern part of Lusatia along the Lusatian Neisse river was handed over to Poland where the boundary is called the Oder–Neisse line. In the Polish part Polish is spoken, and in the German part German, Upper- and Lower Sorbian. The biggest Lusatian town is Cottbus/Chóśebuz.
The name derives from the Sorbian word łužicy meaning "swamps" or "water-hole".
Lausitz is a general region.