The Archdiocese of Milan is a metropolitan see of the Catholic Church in Italy that covers the areas of Milano, Monza, Lecco and Varese.

It has long maintained its own Latin liturgical rite, the Ambrosian rite, which is still used in most of its extension.

Among its past archbishops, the better known are Saint Ambrose, Saint Charles Borromeo, and Pope Paul VI.The Archdiocese of Milan is the metropolitan see of the ecclesiastical province of Milan, which includes the suffragan dioceses of Bergamo, Brescia, Como, Crema, Cremona, Lodi, Mantova, Pavia, and Vigevano.Milan's Archdiocese is the largest in Europe.