Kupowo [kuˈpɔvɔ] is a village in the administrative district of Gmina Rutka-Tartak, within Suwałki County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Lithuania. It lies approximately 5 kilometres (3 mi) south-east of Rutka-Tartak, 27 km (17 mi) north of Suwałki, and 134 km (83 mi) north of the regional capital Białystok.