The Metropolis GZM (Polish: Metropolia GZM, formally in Polish Górnośląsko-Zagłębiowska Metropolia is a metropolitan association composed of 41 contiguous gminas, with a total population of over 2 million, covering most of the Katowice metropolitan area in the Silesian Voivodeship of Poland. The seat of metropolitan administration is Katowice, the largest member city and the voivodeship capital.