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. The town is located in the Kwisa valley of the Jizera Mountains, a part of the Sudetes range. As at 2019, it has a population of 4,147.