Słustowo [swusˈtɔvɔ] is a village in the administrative district of Gmina Nasielsk, within Nowy Dwór County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) north-west of Nasielsk, 23 km (14 mi) north of Nowy Dwór Mazowiecki, and 50 km (31 mi) north of Warsaw.