Sumiężne [suˈmjɛ̃ʐnɛ] is a village in the administrative district of Gmina Małkinia Górna, within Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) west of Małkinia Górna, 12 km (7 mi) south of Ostrów Mazowiecka, and 85 km (53 mi) north-east of Warsaw.