The 1930–31 Serie B was the second tournament of this competition played in Italy since its creation.
Teams Derthona, Lucchese, Udinese and Palermo had been promoted from Prima Divisione, while Cremonese and Padova had been relegated from Serie A.
Events Following a reform of the third division, the relegations were reduced from four to three.
Final classification
Results
Relegation tie-breaker Played in Bologna, 12 July 1931
Lucchese were relegated to Prima Divisione.