Kosiny Bartosowe [kɔˈɕinɨ bartɔˈsɔvɛ] is a village in the administrative district of Gmina Wiśniewo, within Mława County, Masovian Voivodeship, in east-central Poland. It lies approximately 3 kilometres (2 mi) south-west of Wiśniewo, 9 km (6 mi) south-west of Mława, and 104 km (65 mi) north-west of Warsaw.