Kolonia Kuźnia [kɔˈlɔɲa ˈkuʑɲa] is a village in the administrative district of Gmina Jastrząb, within Szydłowiec County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) north of Jastrząb, 9 km (6 mi) north-east of Szydłowiec, and 104 km (65 mi) south of Warsaw.