The 2011–12 Serie D was the sixty-fourth edition of the top level Italian non-professional football championship. It represented the fifth tier in the Italian football league system. It consisted of 168 teams divided into six 18-team divisions and three 20-team divisions. In the summer 2011 Montecchio Maggiore was readmitted in Serie D to the judgment of the High Court of Justice, that has transformed the score of Montebelluna-Este from 2–1 to 0–3, for infringement of the rule on under. And the last team admitted was Verbano, increasing the total number of teams to 168.