Zwardoń is a village in the administrative district of Gmina Rajcza, within Żywiec County, Silesian Voivodeship, in the Żywiec Beskids mountain range in southern Poland, on the border with Slovakia. It lies approximately west of Rajcza, south-west of Żywiec, and south of the regional capital Katowice. The village is mostly known for mountain tourism and as a border crossing point. In 1884, a railway line to Čadca was opened. Although Zwardoń belongs nowadays to the Silesian Voivodeship, historically it lied in Lesser Poland. The village has a population of approximately 1,000.