Olszewnica Nowa [ɔlʂɛvˈnit͡sa ˈnɔva] is a village in the administrative district of Gmina Wieliszew, within Legionowo County, Masovian Voivodeship, in east-central Poland. It lies approximately 10 kilometres (6 mi) west of Wieliszew, 7 km (4 mi) north-west of Legionowo, and 27 km (17 mi) north-west of Warsaw.