Niewiadoma [ɲɛvjaˈdɔma] is a village in the administrative district of Gmina Sabnie, within Sokołów County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) south of Sabnie, 8 km (5 mi) north-east of Sokołów Podlaski, and 93 km (58 mi) east of Warsaw.