Kolno [ˈkɔlnɔ] is a village in the administrative district of Gmina Poświętne, within Wołomin County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) west of Poświętne, 10 km (6 mi) east of Wołomin, and 28 km (17 mi) north-east of Warsaw.