Łopianka [wɔˈpjaŋka] is a village in the administrative district of Gmina Łochów, within Węgrów County, Masovian Voivodeship, in east-central Poland. It lies approximately 3 kilometres (2 mi) north-east of Łochów, 26 km (16 mi) north-west of Węgrów, and 63 km (39 mi) north-east of Warsaw.