Mostostal is a Polish steel construction group of companies. The company fabricates and builds a wide range of industrial structures from chemical plants to radio masts.
The company was formed in 1945 in Kraków, but a short time after moved its headquarters to Zabrze, then to Warsaw. It is now part of one of the largest industrial conglomerates in Poland.
In the 1970s, the company built the radio mast in Konstantynów, which was the tallest structure on Earth until its collapse in 1991.