Stary Gromadzyn [ˈstarɨ ɡrɔˈmad͡zɨn] is a village in the administrative district of Gmina Kolno, within Kolno County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 2 kilometres (1 mi) north-east of Kolno and 88 km (55 mi) west of the regional capital Białystok.