Ostrożeń Trzeci [ɔsˈtrɔʐɛɲ ˈtʂɛt͡ɕi] is a village in the administrative district of Gmina Żelechów, within Garwolin County, Masovian Voivodeship, in east-central Poland. It lies approximately 9 kilometres (6 mi) south-west of Żelechów, 19 km (12 mi) south-east of Garwolin, and 74 km (46 mi) south-east of Warsaw.