| Competition: | Liga Mexicana de Football Amateur Association |
| Season: | 1920-21 |
| Winners: | Liga Mexicana: Asturias (1st title) Liga Nacional: Real España (1st title) (Unrecognized titles) |
| Prevseason: | 1919-20 |
| Nextseason: | 1921-22 |
The 1920-21 season was the first divided into two leagues, the Liga Mexicana and Liga Nacional (en|Mexican League and National League) were played. After the expulsion of Tigres México from the league, España FC and España Veracruz withdrew in solidarity. España FC changed its name to "Real España" and decided to form their own league called Liga Nacional.Due to the separation of the leagues, both tournaments and champions were not recognized by the organizing body, which was the Asociación de Aficionados de México en la Liga de Football (en|Mexican Fan Association in the Football League).
The 5 participating teams from Mexico City, and all the matches were played at Parque Asturias.Pachuca AC and Deportivo Español were dissolved. In replacement Deportivo Internacional and Club Morelos joined the league.
| Club | Pld | W | D | L | Pts | |
|---|---|---|---|---|---|---|
| Asturias | 8 | 5 | 2 | 1 | 12 | |
| Deportivo Internacional | 7 | 3 | 3 | 1 | 9 | |
| Club Morelos | 7 | 2 | 2 | 3 | 6 | |
| Germania | 7 | 1 | 3 | 3 | 5 | |
| Club México | 7 | 1 | 2 | 4 | 4 |
The 5 participating teams from Mexico City, and all the matches were played at Parque España.Reforma, América, Luz y Fuerza and L'Amicale Française joined the Liga Nacional.
| Club | Pld | W | D | L | Pts | |
|---|---|---|---|---|---|---|
| Real España | 8 | 6 | 2 | 0 | 14 | |
| América | 8 | 4 | 3 | 1 | 11 | |
| L'Amicale Française | 8 | 3 | 1 | 4 | 7 | |
| Luz y Fuerza | 8 | 2 | 0 | 6 | 4 | |
| Reforma | 8 | 1 | 2 | 5 | 4 |