Wąsosze [vɔ̃ˈsɔʂɛ] is a village in the administrative district of Gmina Wieczfnia Kościelna, within Mława County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) south-east of Wieczfnia Kościelna, 12 km (7 mi) north-east of Mława, and 111 km (69 mi) north of Warsaw.