Antoniówka [antɔˈɲufka] is a village in the administrative district of Gmina Sławno, within Opoczno County, Łódź Voivodeship, in central Poland. It lies approximately 3 kilometres (2 mi) north-east of Sławno, 9 km (6 mi) west of Opoczno, and 64 km (40 mi) south-east of the regional capital Łódź.