Wieprz (, ) is a village in Żywiec County, Silesian Voivodeship, in southern Poland. It is the seat of the gmina (administrative district) called Gmina Radziechowy-Wieprz.
It is one of the oldest villages in Żywiec Basin. It was first mentioned in Liber beneficiorum (1470-1480) as Wyeprze Maior and Wyeprze Minor.Joannis Długosz Senioris Canonici Cracoviensis, "Liber Beneficiorum", Aleksander Przedziecki, Tom II, Kraków 1864, p. 290.
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