The 1930–31 Prima Divisione was the third-level league of the 31st Italian football championship.
In 1928, FIGC had decided a reform of the league structure of Italian football.
The Northern section rose from 45 to 56 clubs including twelve teams from the disbanded lower inter-regional Authority.
The Southern section rose from 15 to 24 clubs including quite all the provincial capitals under FIGC decision.
Final group winners were promoted, ultimate and penultimate clubs in the regular season should be relegated.