Oleśnica (Polish: [ɔlɛˈɕɲit͡sa]) is a village in the administrative district of Gmina Zagórów, within Słupca County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 3 kilometres (2 mi) east of Zagórów, 16 km (10 mi) south of Słupca, and 74 km (46 mi) east of the regional capital Poznań.