Kladno, mining city, north-central Czech Republic, northwest of Prague. The two original forest villages of Kladno and Buštěhrad developed after 1842 as the industrial centre of the Kladno hard-coal basin. There are local deposits of iron, but most is imported. The town has blast furnaces and a rolling mill and is the site of large steelworks. Finished parts for the machine industry, cables, bicycles, and semifinished products are manufactured; steel alloys and pig iron are also produced. Pop. (2007 est.) 69,276.