The present work will attempt to analyze the document of the second conference of the Latin American episcopate - held in the city of Medellín - (1968), tracing the subsequent documents of the general conferences until Aparecida (2007); with the intention of exploring the notion of the categories of “ecumenism” and “interreligious dialogue”. From the above, we seek to see the narrative transformations of the conferences, the influence of the Second Vatican Council on the commitment of the Latin American Church, the confluence of discourses, contexts and interpretative forms; Thus, an attempt will be made to find the central points to see “ecumenism” and “interreligious dialogue” historically in their advancement and/or regression.