Serie B de México
| Founded | 1950 |
|---|---|
| Country | Mexico |
| Number of clubs | 13 teams |
| Level on pyramid | 3 |
| Promotion to | Serie A |
| Relegation to | Liga TDP |
| Current champions | Santiago (Clausura 2025 season) |
| Broadcaster(s) | Megacable Televisa TVC Deportes |
| Website | Official website |
| Current: 2025–26 Serie B de México season | |
The Serie B is a Mexican association football league. Fifteen teams compete in one group. Since the 2024–25 season, it is two tournament per season. The top 8 teams advances directly to the Liguilla to play for promotion to Liga Premier – Serie A, and the stadium must meet the requirements to promote as well. In the 2020–21 season, Serie B was on hiatus due to COVID-19, but Serie B was reactivated for the 2021–22 season.