Kałęczyn [kaˈwɛnt͡ʂɨn] is a village in the administrative district of Gmina Nur, within Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland. It lies approximately six km north of Nur, 27 km (17 mi) east of Ostrów Mazowiecka and 103 km (64 mi) north-east of Warsaw.