Świeradów-Zdrój (Polish: [ɕfjɛˈraduv ˈzdruj]; German: Bad Flinsberg) is a spa town in Lubań County, Lower Silesian Voivodeship, in south-western Poland near the border with the Czech Republic.

In 1572, the Swiss doctor Leonard Thurneysser, private physician of Elector John George of Brandenburg wrote for the first time about the discovery of the extraordinary features of the local healing waters.

The area was heavily devastated during the Thirty Years' War, at first by Imperial troops under General Ottavio Piccolomini, then by Swedish forces in the course of the seize of nearby Gryf Castle (Greiffenstein) in Proszówka ( Gräflich Neundorf).

A century later the land owners of the Schaffgotsch noble family established a special commission to gather scientific evidence and describe the healing effects of the Świeradów waters.

Direct railway connection to Mirsk (then Friedeberg) operating since 1909 opened Świeradów to the world and contributed to full prosperity of the spa town.

This eventful history begins with the German name Fegebeutel, which meant ‘a place where your purse will be cleaned’ (Czyścisakwa in Polish).

One explanation says that the name derived from a combination of two words: świerk (spruce) and radon without which the spa would not exist, and the other one mentions Saint Andrew Świerad, who came here from Slovakia about the year 1000.

The spa house built in 1899 offers mineral water, radon and mud bath treatments of rheumatism and other adult diseases.