Kamieńczyk Wielki (Polish pronunciation: [kaˈmjɛj̃tʂɨk ˈfjɛlkʲi]) is a village in the administrative district of Gmina Boguty-Pianki, within Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) west of Boguty-Pianki, 32 km (20 mi) east of Ostrów Mazowiecka, and 108 km (67 mi) north-east of Warsaw.