Kołacin [kɔˈwat͡ɕin] is a village in the administrative district of Gmina Dmosin, within Brzeziny County, Łódź Voivodeship, in central Poland. It lies approximately 9 kilometres (6 mi) south-east of Dmosin, 8 km (5 mi) north-east of Brzeziny, and 26 km (16 mi) east of the regional capital Łódź.