Buczyn Szlachecki (Polish pronunciation: [ˈbutʂɨn ʂlaˈxɛtskʲi]) is a village in the administrative district of Gmina Kosów Lacki, within Sokołów County, Masovian Voivodeship, in east-central Poland. It lies approximately 11 kilometres (7 mi) south-east of Kosów Lacki, 13 km (8 mi) north of Sokołów Podlaski, and 90 km (56 mi) east of Warsaw.