Serie B de México

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.

Teams for 2024–25 season
Below are listed the member clubs of the Serie B for the 2024-25 season.

Teams on hiatus
List of teams on hiatus for the 2024–25 season.

Offseason Changes

 * On May 11, 2024 Aguacateros CDU was promoted to Serie A.
 * On May 26, 2024 Yautepec was promoted to Serie B from Liga TDP. On June 28 the team was relocated to Manzanillo. On July 15, 2024 the went on hiatus due to financial problems.
 * On June 28, 2024 C.D. Avispones de Chilpancingo was promoted to Serie A as an expansion team.
 * On June 28, 2024 Cordobés joined the league as an expansion team.
 * On June 28, 2024 Calor and Saltillo were relocated to Serie B from Serie A. Calor was relocated to León.
 * On June 28, 2024 Dongu was put on hiatus.
 * On June 28, 2024 the league format was modified, the two tournaments per season were reinstated after one year with a single-season tournament.
 * On July 15, 2024 Cañoneros was relocated from Mexico City to Xalapa.