Nowosiółki [nɔvɔˈɕuu̯kʲi] is a village in the administrative district of Gmina Milejczyce, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 6 kilometres (4 mi) north-east of Milejczyce, 26 km (16 mi) north-east of Siemiatycze, and 63 km (39 mi) south of the regional capital Białystok.