The 2017–18 Serie D was the seventieth edition of the top level Italian non-professional football championship.
It represents the fourth tier in the Italian football league system.
Scudetto winners: Pro Patria The nine group winners are automatically promoted to Serie C. Vibonese was promoted after defeating Troina in a promotion playoff after penalties, as the two teams ended the Girone I on level points.
On 3 August 2018, it was officially announced by the Italian Football Federation (FIGC) that Cavese and Imolese were admitted to Serie C to fill the vacancies created by teams that withdrew.
Como 1907's request to move up to Serie C was rejected due to its failure to present two required financial guarantees.