Rostki Wielkie [ˈrɔstki ˈvjɛlkʲɛ] is a village in the administrative district of Gmina Małkinia Górna, within Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland. It lies approximately 3 kilometres (2 mi) east of Małkinia Górna, 17 km (11 mi) south-east of Ostrów Mazowiecka, and 91 km (57 mi) north-east of Warsaw.