1964 was a decisive year for carrying out the process of liturgical reform. Although the early days of these reforms have been widely studied by Vatican II liturgists and historians, new documentary sources give researchers access to material that complements, deepens, expands, and provides further insight into the research published to date. This is the case with the personal archives of Jorge Medina. Various documents cataloged therein contain material relating both to the complex path of liturgical reform in Chile and to the early reception and implementation of the Constitution on the Sacred Liturgy, Sacrosanctum concilium. In light of this unpublished documentation, and against the backdrop of the motu proprio Sacram Liturgiam, this work examines the liturgical proposals that the Chilean episcopate elevated to the Holy See in order to implement the reforms in the country.1964 was a decisive year for carrying out the process of liturgical reform. Although the early days of these reforms have been widely studied by Vatican II liturgists and historians, new documentary sources give researchers access to material that complements, deepens, expands, and provides further insight into the research published to date. This is the case with the personal archives of Jorge Medina. Various documents cataloged therein contain material relating both to the complex path of liturgical reform in Chile and to the early reception and implementation of the Constitution on the Sacred Liturgy, Sacrosanctum concilium. In light of this unpublished documentation, and against the backdrop of the motu proprio Sacram Liturgiam, this work examines the liturgical proposals that the Chilean episcopate elevated to the Holy See in order to implement the reforms in the country.  1964 fue un año resolutivo en el arranque del proceso aplicativo de la reforma litúrgica. Aunque estos inicios han sido ampliamente estudiados por liturgistas e historiadores del concilio, el acceso a nuevas fuentes documentales pone a disposición de los investigadores un material que sirve para completar, complementar, enriquecer y abrir nuevas pistas a los trabajos realizados hasta la fecha. Es el caso del archivo personal de Jorge Medina, en el que se encuentran catalogados diversos documentos, los que contienen material relativo, tanto al complejo trayecto de la actuación de la reforma litúrgica como a la primera recepción y aplicación de la constitución Sacrosanctum concilium en Chile. A la luz de esta documentación inédita, este trabajo, que tiene como telón de fondo la publicación del motu proprio Sacram Liturgiam, estudia las propuestas que, en materia litúrgica, el episcopado chileno elevó a la santa sede para poner en marcha la reforma en el país.