Łątczyn Włościański (Polish pronunciation: [ˈwɔnt.tʂɨn vwɔɕˈtɕaj̃skʲi]) is a village in the administrative district of Gmina Troszyn, within Ostrołęka County, Masovian Voivodeship, in east-central Poland. It lies approximately 9 kilometres (6 mi) north-east of Troszyn, 17 km (11 mi) east of Ostrołęka, and 112 km (70 mi) north-east of Warsaw.