Kolonia Ostoja [kɔˈlɔɲa ɔsˈtɔja] is a village in the administrative district of Gmina Zelów, within Bełchatów County, Łódź Voivodeship, in central Poland. It lies approximately 7 kilometres (4 mi) east of Zelów, 10 km (6 mi) north-west of Bełchatów, and 40 km (25 mi) south of the regional capital Łódź.