Kostarowce [kɔstaˈrɔft͡sɛ] is a village in the administrative district of Gmina Sanok, within Sanok County, Subcarpathian Voivodeship, in south-eastern Poland. It lies approximately 10 kilometres (6 mi) north-west of Sanok and 51 km (32 mi) south of the regional capital Rzeszów.