Leśniewo [lɛɕˈɲɛvɔ] is a village in the administrative district of Gmina Szulborze Wielkie, within Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland. It lies approximately 2 kilometres (1 mi) west of Szulborze Wielkie, 22 km (14 mi) east of Ostrów Mazowiecka, and 103 km (64 mi) north-east of Warsaw.