Stare Kosiny [ˈstarɛ kɔˈɕinɨ] is a village in the administrative district of Gmina Wiśniewo, within Mława County, Masovian Voivodeship, in east-central Poland.

It lies approximately 12 kilometres (7 mi) south of Mława and 101 km (63 mi) north-west of Warsaw.