Wieprz (Polish: [ˈvjɛpʂ] (listen), lit. '"Boar"') 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 lies approximately 7 kilometres (4 mi) south of Żywiec and 70 km (43 mi) south of the regional capital Katowice. The village has a population of 3,535.
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.