The Metropolitan Ceety o Milan (Italian: Città Metropolitana di Milano) is a metropolitan ceety in the Lombardy region, Italy. Its caipital is the ceety o Milan. It replacit the Province o Milan an includes the ceety o Milan an ither 133 municipalities (comuni). It wis first creatit bi the reform o local authorities (Law 142/1990) an then established bi the Law 56/2014. It haes been operative since 1 Januar 2015.