| Competition: | Serie C |
| Season: | 1939–40 |
| Promoted: | Reggiana Savona Vicenza Maceratese Spezia |
| Relegated: | many disbanded clubs |
| Prevseason: | 1938–39 |
| Nextseason: | 1940–41 |
The 1939–40 Serie C was the fifth edition of Serie C, the third highest league in the Italian football league system.