Tanica Dolna [taˈnit͡sa ˈdɔlna] is a village in the administrative district of Gmina Michałowo, within Białystok County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Belarus. It lies approximately 13 kilometres (8 mi) south-east of Michałowo and 42 km (26 mi) south-east of the regional capital Białystok.