This championship had three groups organized with geographical criteria for the last time. The round-robin system should be restored in 1948.
Six clubs had been promoted from the three Serie C leagues, while Brescia and Venezia had been relegated from Serie A, and US Cagliari was restored after 7 years following the end of the American occupation of Sardinia.
11 out of 18 clubs per group should be relegated to restore the national round-robin tournament.
A.C. Prato relegated to Serie C.