Olszewiec [ɔlˈʂɛvjɛt͡s] is a village in the administrative district of Gmina Czernice Borowe, within Przasnysz County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) east of Czernice Borowe, 7 km (4 mi) north-west of Przasnysz, and 94 km (58 mi) north of Warsaw.