Jabłonna [jaˈbwɔnna] is a village in the administrative district of Gmina Grębków, within Węgrów County, Masovian Voivodeship, in east-central Poland. It lies approximately 3 kilometres (2 mi) south-east of Grębków, 18 km (11 mi) south of Węgrów, and 64 km (40 mi) east of Warsaw.