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Lubsko is situated at an altitude of 77 m on the river Lubsza (Lubis) in the Żary county in the southwestern part of the Lubuskie (Lebus) voivodship of western Poland. The town has a population of about 15,400 (2005).

Lubsko is one of the oldest towns of the region. The earliest written mention is found in a document of 1258. In 1251 it had become part of the principality of Głogów (Glogau) and in 1283 the village was chartered as a town. In 1331 it passed to the Bohemian crown and in 1482 the town, in German called Sommerfeld, became part of the margraviate Brandenburg (1701 Kingdom of Prussia). In 1846 Sommerfeld/Lubsko was connected to the railroad from Berlin to Breslau (today Wrocław). After World War II Lubsko became part of Poland.

Schloss Dolzig [left], the manor house of Dłużek (Dolzig), was the birthplace of Auguste Viktoria, Princess of Schleswig-Holstein-Sonderburg-Augustenburg, consort of the last German emperor, Wilhelm II. Auguste Viktoria was born here on October 22, 1858.