Zakrzewek [zaˈkʂɛvɛk] is a village in the administrative district of Gmina Ostrów Mazowiecka, within Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland. It lies approximately 8 kilometres (5 mi) north of Ostrów Mazowiecka and 94 km (58 mi) north-east of Warsaw.