Wólka Dolna [ˈvulka ˈdɔlna] is a village in the administrative district of Gmina Kosów Lacki, within Sokołów County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) north of Kosów Lacki, 29 km (18 mi) north of Sokołów Podlaski, and 90 km (56 mi) north-east of Warsaw.