The right to truth, as a legal concept, has emerged in different national, regional and international settings of human rights protection. It refers to the state's obligation to provide information to the victims, their families, and the society as a whole, about the circumstances in which gross human rights violations were committed. The truth is analyzed, therefore, as the consequence of a process involving the search of justice and the issue of rulings that have a merely reparational goal. However, for the safeguard international systems, this right has not been clearly recognized, at least in a conventional manner. Its mention in these systems is limited and ambiguous. Therefore, this paper aims to study how the Human Rights Inter-American System has defined the right to truth, taking as study case the El Mozote Massacre, which took place in El Salvador in 1981. This event still today remains unpunished, leaving the Salvadorian society without justice or reparation, but fundamentally without memory. [ABSTRACT FROM AUTHOR]