Ossa [ˈɔssa] is a village in the administrative district of Gmina Białaczów, within Opoczno County, Łódź Voivodeship, in central Poland. It lies approximately 5 kilometres (3 mi) west of Białaczów, 12 km (7 mi) south of Opoczno, and 77 km (48 mi) south-east of the regional capital Łódź.