The holding of the seminar "The Role of Mexico's Foreign Policy in the Peace Process in El Salvador", which took place on April 27, 2012, on the occasion of the commemoration of the 20th anniversary of the Peace Agreements in El Salvador, It is, in a certain sense, the origin of the special number of the Revista Mexicana de Política Exterior. The texts selected in this special issue offer a historical panorama of the Central American region and a retrospective diagnosis of the economic, political and social conditions that led to an armed conflict. Other texts collect and gloss initiatives such as the Franco-Mexican Declaration on El Salvador, of August 28, 1981, while others deal with the trajectory of the Contadora Group, a notable diplomatic coordination mechanism. Likewise, texts and testimonies are included that account for the role of Mexican diplomacy in the negotiation process of the Chapultepec Agreements, signed in Mexico by the Salvadoran government and the insurgent forces in January 1992.