Bierzwnica [bjɛʐvˈnit͡sa] (German Reinfeld) is a village in the administrative district of Gmina Świdwin, within Świdwin County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 13 kilometres (8 mi) south-east of Świdwin and 95 km (59 mi) east of the regional capital Szczecin.