Kazuń Nowy is a village in the administrative district of Gmina Czosnów, within Nowy Dwór County, Masovian Voivodeship, in east-central Poland. It is situated approximately 6 kilometres (4 mi) north-west of Czosnów, 2 km (1 mi) south of Nowy Dwór Mazowiecki, and 32 km (20 mi) north-west of Warsaw.