It still remains to be seen when, or even if, Juan Manuel Marquez will return to the boxing ring. But as long as he is still officially active, he has to be regarded as the top Mexican pound-for-pound boxer.
He's on the short list for the top Mexican boxer of all time.
But the United States' neighbor to the south has one of the richest boxing traditions on the planet. In recent decades, especially, boxing fans with Mexican heritage on both sides of the border have been essential for keeping the sport strong.
This list is limited specifically to fighters of Mexican nationality, not simply Mexican ethnicity. For the purposes of my list, if BoxRec doesn't rate them as Mexican, I have not rated them as such, either.