The Metropolitan City of Milan is a metropolitan city in the Lombardy region of Italy. It is the second most populous metropolitan city in the nation after the Metropolitan City of Rome Capital. Its capital is the city of Milan. It replaced the province of Milan and includes the city of Milan and other 132 comuni. It was first created by the reform of local authorities and then established by the Law 56/2014. It has been operative since 1 January 2015.

The 14 metropolitan cities of Italy are administrative divisions of Italy, operative since 2015, which are a special type of province. The metropolitan city, as defined by law, includes a large core city and the surrounding suburbs and countryside closely related to it by economic activities and essential public services, as well as to cultural relations and to territorial features.