Chieri 1955
        
                
                    
                    Gavorrano
        
                
                    
                    Lavagnese
        
                
                    
                    Borgosesia
        
                
                    
                    Forli
        
                
                    
                    Sestri Levante
        
                
                    
                    Prato
        
                
                    
                    Vastese
        
                
                    
                    Fezzanese
        
                
                    
                    Cavese
        
                
                    
                    US Inveruno
        
                
                    
                    Sambenedettese
        
                
                    
                    Vibonese
        
                
                    
                    Taranto
        
                
                    
                    San Marino Calcio
        
                
                    
                    Piacenza
        
                
                    
                    Tuttocuoio
        
                
                    
                    Fano
        
                
                    
                    Pinerolo FC
        
                
                    
                    Robur Siena
        
                
                    
                    Colligiana
        
                
                    
                    Vis Pesaro
        
                
                    
                    Pistoiese
        
                
                    
                    Trapani
        
                
                    
                    Livorno
        
                
                    
                    Bassano
        
                
                    
                    Matera
        
                
                    
                    Mantova
        
                
                    
                    Reggina
        
                
                    
                    Lupa Roma
        
                
                    
                    Casertana
        
                
                    
                    Como
        
                
                    
                    Arezzo
        
                
                    
                    Teramo
        
                
                    
                    Maceratese
        
                
                    
                    Viterbese
        
                
                    
                    Akragas
        
                
                    
                    Fondi
        
                
                    
                    Giana Erminio
        
                
                    
                    Novara
        
                
                    
                    Santarcangelo
        
                
                    
                    Modena
        
                
                    
                    Bari
        
                
                    
                    Sporting Recco
        
                
                    
                    AV Herculaneum
        
                
                    
                    Gubbio
        
                
                    
                    Monopoli
        
                
                    
                    Lucchese
        
                
                    
                    Palermo
        
                
                    
                    Racing Roma
        
              The Serie D (Italian pronunciation: [ˈseːrje ˈdi]) is the highest level of semi-professional football in Italy, and the fourth tier of the Italian national league system, the lowest one with a national organization. It sits beneath the third and lowest fully professional league, Serie C, and feeds in to it through promotion and relegation. Serie D is administered by the Lega Nazionale Dilettanti and is organized by the Roman Comitato Interregionale (Interregional Committee), a "league in the league" inside the LND.
In 1948 the three leagues running Division 3 (Serie C) had to be reorganized due to an ever-growing number of regional teams. FIGC decided not to relegate the excess teams to regional championships. It chose the winners and a few runners-up from the 36 Serie C championships to be added to the new third division set up into 4 groups. The rest of the teams joined the new Promozione, which changed its name in 1952 into IV Serie (Fourth Division) and then in 1959 into Serie D.
From 1959 each player in the Serie D championships had to opt for semi-professional status, by signing a specially issued status attribution form. The championship was thus included in the Lega Nazionale Semiprofessionisti, today known as Lega Pro. Serie D was re-organized in 1981 when championships were reduced. The league name changed into the Interregional. Players lost semi-pro status and converted to amateurs. The championship subsequently passed into the Lega Nazionale Dilettanti. From 1992 to 1999 the name changed into Campionato Nazionale Dilettanti before eventually returning to the current Serie D name. With the merger of the Lega Pro's two divisions at the end of the 2013–14 season to reestablish the Serie C, Serie D and the leagues below it moved up by one level in the pyramid system, reducing the number of leagues in Italian football to nine.