The Fourth Municipality (In Italian: Quarta Municipalità or Municipalità 4) is one of the ten boroughs in which the Italian city of Naples is divided.

The municipality is located in central-eastern area of the city and includes the eastern branch of the Port of Naples.

Its territory includes the zones of Decumani, Centro Storico (historical center, partly included), Porta San Gennaro, Port'Alba, Porta Capuana, Borgo Sant'Antonio Abate, Vasto, Arenaccia, Ferrovia (railway), Sant'Erasmo, Rione Luzzatti, Rione Ascarelli, Rione Sant'Alfonso, Zona Cimiteriale (cemetery of Poggioreale) and Stadera.

The Fourth Municipality is divided into 4 quarters:

Quarter	Population	Area (km²)
Poggioreale	25,257	4.45
San Lorenzo	49,275	1.42
Vicaria	15,464	0.72
Zona Industriale	6,082	2.68
Total	96,078	9.27

• Centro Direzionale

• (in Italian) Municipalità 4 page on Naples website