Serie D
| Organising body | Lega Nazionale Dilettanti |
|---|---|
| Founded | 1948 as Promozione 1992 as Campionato Nazionale Dilettanti |
| Country | Italy |
| Other club from | San Marino |
| Confederation | UEFA |
| Leagues | Leghe Interregionali (1948) Lega IV Serie (1952) Lega Semiprofessionisti (1959) Lega Nazionale Dilettanti (1981) |
| Divisions | 9 (8 in 2026) |
| Number of clubs | 162 (160 in 2026) |
| Level on pyramid | 4 (1948-78 and 2014-today) 5 (1978-2014) |
| Promotion to | Serie C |
| Relegation to | Eccellenza |
| Domestic cup | Coppa Italia Dilettanti (until 1999) |
| League cup | Coppa Italia Serie D (since 1999) |
| Current champions | Livorno (1st title) (2024–25) |
| Most championships | Siena (2 titles) |
| Website | seried.lnd.it |
| Current: 2025–26 Serie D | |
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.