Oleśnica (Polish pronunciation: [ɔlɛˈɕɲit͡sa]) is a village in the administrative district of Gmina Ostrówek, within Wieluń County, Łódź Voivodeship, in central Poland. It lies approximately 5 kilometres (3 mi) north of Ostrówek, 18 km (11 mi) north of Wieluń, and 75 km (47 mi) south-west of the regional capital Łódź.