Olszowiec [ɔlˈʂɔvjɛt͡s] is a village in the administrative district of Gmina Sławno, within Opoczno County, Łódź Voivodeship, in central Poland. It lies 3 kilometres (2 mi) west of Sławno, 13 km (8 mi) west of Opoczno, and 62 km (39 mi) south-east of the regional capital Łódź.