Piastowice [pjastɔˈvit͡sɛ] is a village in the administrative district of Gmina Lubsza, within Brzeg County, Opole Voivodeship, in south-western Poland. It lies approximately 3 kilometres (2 mi) south-west of Lubsza, 4 km (2 mi) north of Brzeg, and 41 km (25 mi) north-west of the regional capital Opole.