Ostrołęka [ɔstrɔˈwɛŋka] is a village in the administrative district of Gmina Sulmierzyce, within Pajęczno County, Łódź Voivodeship, in central Poland. It lies approximately 5 kilometres (3 mi) south-west of Sulmierzyce, 10 km (6 mi) east of Pajęczno, and 73 km (45 mi) south of the regional capital Łódź.