2012–13 Tercera División de México season

The 2012–13 Tercera División season is the fourth-tier football league of Mexico. The tournament began on 31 August 2012 and finished on 2 June 2013.

Competition format
The Tercera División (Third Division) is divided into 14 groups. For the 2009/2010 season, the format of the tournament has been reorganized to a home and away format, which all teams will play in their respective group. The 14 groups consist of teams who are eligible to play in the liguilla de ascenso for one promotion spot, teams who are affiliated with teams in the Liga MX, Ascenso MX and Liga Premier, which are not eligible for promotion but will play that who the better filial team in an eight team filial playoff tournament for the entire season.

The league format allows participating franchises to rent their place to another team, so some clubs compete with a different name than the one registered with the FMF.

Group 1
Group with 9 teams from Campeche, Chiapas, Quintana Roo, Tabasco and Yucatán.

Group 2
Group with 16 teams from Chiapas, Oaxaca and Veracruz.

Group 3
Group with 17 teams from Guerrero, Morelos, Oaxaca, Puebla, State of Mexico and Veracruz.

Group 4
Group with 17 teams from Greater Mexico City.

Group 5
Group with 16 teams from Mexico City, Michoacán and State of Mexico.

Group 6
Group with 16 teams from Hidalgo, Puebla, San Luis Potosí, State of Mexico and Tlaxcala.

Group 7
Group with 16 teams from Greater Mexico City.

Group 8
Group with 17 teams from Guanajuato, Guerrero, Michoacán and Querétaro.

Group 9
Group with 18 teams from Aguascalientes, Guanajuato, Jalisco, Michoacán, San Luis Potosí and Zacatecas.

Group 10
Group with 17 teams from Colima and Jalisco.

Group 11
Group with 18 teams from Jalisco, Michoacán and Nayarit.

Group 12
Group with 17 teams from Coahuila, Nuevo León, San Luis Potosí and Tamaulipas.

Group 13
Group with 11 teams from Baja California, Sinaloa and Sonora.

Group 14
Group with 9 teams from Chihuahua, Coahuila, Durango and Sonora.