Giugliano in Campania, also known simply as Giugliano, is a city and comune (municipality) in the Metropolitan City of Naples, Campania, Italy. A suburb of Naples, as of 2017, it had some 124,000 inhabitants, making it the most populated Italian city that is not a provincial capital.

The Metropolitan City of Naples is a metropolitan city in the Campania region of Italy. Its capital is the city of Naples. The province was established on 1 January 2015 and contains 92 comuni . It was first created by the reform of local authorities and established by Law 56/2014, thus replacing the province of Naples in 2015.