Zaręby Kościelne [zaˈrɛmbɨ kɔɕˈt͡ɕɛlnɛ] is a village in Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland. It is the seat of the gmina (administrative district) called Gmina Zaręby Kościelne. It lies approximately 17 kilometres (11 mi) east of Ostrów Mazowiecka and 97 km (60 mi) north-east of Warsaw.