| Competition: | Serie B |
| Season: | 1929–30 |
| Winners: | Casale 1st title |
| Prevseason: | 1928–29 DN |
| Nextseason: | 1930–31 |
The 1929–30 Serie B was the first tournament of this round robin competition played in Italy after its creation.
The 18 clubs were the last 7 of each group of 1928–29 Divisione Nazionale, the first 3 teams of the 1928–29 Prima Divisione, and the winner of the special 1928–29 Southern Championship.