Żelaźnia [ʐɛˈlaʑɲa] is a village in the administrative district of Gmina Lubowidz, within Żuromin County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) east of Lubowidz, 5 km (3 mi) north of Żuromin, and 125 km (78 mi) north-west of Warsaw.