Kotłowacz [kɔˈtwɔvat͡ʂ] is a village in the administrative district of Gmina Rzeczniów, within Lipsko County, Masovian Voivodeship, in east-central Poland. It lies approximately 2 kilometres (1 mi) south of Rzeczniów, 17 km (11 mi) west of Lipsko, and 126 km (78 mi) south of Warsaw.