Serednica [sɛrɛdˈɲit͡sa] is a village in the administrative district of Gmina Ustrzyki Dolne, within Bieszczady County, Subcarpathian Voivodeship, in south-eastern Poland. It lies approximately 10 kilometres (6 mi) north-west of Ustrzyki Dolne and 70 km (43 mi) south-east of the regional capital Rzeszów.