Kołaki-Wietrzychowo [kɔˈwaki vjɛtʂɨˈxɔvɔ] is a village in the administrative district of Gmina Mały Płock, within Kolno County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 16 kilometres (10 mi) south-east of Kolno and 77 km (48 mi) west of the regional capital Białystok.