Rutki-Kossaki [ˈrutki kɔsˈsaki] is a village in Zambrów County koszary, Podlaskie Voivodeship, in north-eastern Poland. It is the seat of the gmina (administrative district) called Gmina Rutki. It lies approximately 17 kilometres (11 mi) north-east of Zambrów and 50 km (31 mi) west of the regional capital Białystok.