Działyń [ˈd͡ʑawɨɲ] is a village in the administrative district of Gmina Olszewo-Borki, within Ostrołęka County, Masovian Voivodeship, in east-central Poland.^[1] It lies approximately 11 kilometres (7 mi) west of Ostrołęka and 99 km (62 mi) north of Warsaw.