Bierzów [ˈbjɛʐuf] is a village in the administrative district of Gmina Kobyla Góra, within Ostrzeszów County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 3 kilometres (2 mi) north of Kobyla Góra, 11 km (7 mi) west of Ostrzeszów, and 128 km (80 mi) south-east of the regional capital Poznań.