This article studies all the interventions of the bishops in Latin America and the Caribbean when drafting the dogmatic constitution Lumen gentium, during Vatican II in 1964. The objective of this work is to bring the contribution made to this document by the churches of Latin America to light. Through this analysis, we draw some conclusions about the shape of the Latin American episcopate, the elements that outlined what would become the ecclesiology of Medellín, and its later effects. Knowing the Latin American episcopate contribution to conciliar ecclesiology does justice to its work which is sometimes unexplored and underappreciated, and better explains the subsequent development of the Catholic Church in Latin America.