Bielsko-Biała is a city in southern Poland, with a population of approximately 166,765 as of December 2022, making it the 22nd largest city in Poland, and an area of 124.51 km2 (48.07 sq mi). It is the core of the broader metropolitan area with around 335,000 inhabitants. It serves as the seat of the Bielsko County, Euroregion Beskydy, Roman Catholic Diocese of Bielsko–Żywiec and the Evangelical Church Diocese of Cieszyn.

Wymysorys, also known as Vilamovian or Wilamowicean, is a West Germanic language spoken by the Vilamovian ethnic minority in the small town of Wilamowice, Silesian Voivodeship, Poland, on the border between Silesia and Lesser Poland, near Bielsko-Biała. It is considered an endangered language, possibly the most so of any of the Germanic languages. There are probably fewer than 20 native users of Wymysorys, virtually all bilingual; the majority are elderly.