The object of the present study is the due process of law. The hypothesis is: if the conventionality control of international human rights is able to modify domestic laws, it is no longer enough to say due process “of law”. The aim of the study is to find out if it is possible to claim for a “conventional due process”. It was realized that due process was never a closed clause. Everyone agrees we also have a “constitutional due process” and due process is enhanced by international human rights. The expression “conventional due process” was already used in 2007 in Petition 1113/06 against Brazil by the Inter-American Commission on Human Rights. In addition, the same expression was used by the Inter-American Court of Human Rights in Cabrera García y Montiel Flores vs. Mexico. The study concludes that the expression “conventional due process” is suitable to refer to the “due process of law” shaped by the conventionality control based on international human rights.