Dwerniczek [dvɛrˈɲit͡ʂɛk] is a village in the administrative district of Gmina Lutowiska, within Bieszczady County, Subcarpathian Voivodeship, in south-eastern Poland, close to the border with Ukraine. It lies approximately 7 kilometres (4 mi) north of Lutowiska, 17 km (11 mi) south-east of Ustrzyki Dolne, and 96 km (60 mi) south-east of the regional capital Rzeszów.

The San river crosses the area.