Niedabyl [ɲɛˈdabɨl] is a village in the administrative district of Gmina Stromiec, within Białobrzegi County, Masovian Voivodeship, in east-central Poland. It lies approximately 2 kilometres (1 mi) north-west of Stromiec, 9 km (6 mi) east of Białobrzegi, and 64 km (40 mi) south of Warsaw.