Kosewo [kɔˈsɛvɔ] is a village in the administrative district of Gmina Pomiechówek, within Nowy Dwór County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) west of Brody-Parcele (the gmina seat), 4 km (2 mi) north of Nowy Dwór Mazowiecki, and 36 km (22 mi) north-west of Warsaw.