Sesto San Giovanni, locally referred to as just Sesto, is a comune (municipality) in the Metropolitan City of Milan, in the Italian region of Lombardy. Its railway station is the northernmost stop on the Milan Metro M1 line. The comune has the honorary title of city, despite being a de facto suburb of Milan.

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.