This dissertation deals with the question of Mary within Christianity, in the context of the dialogue between the Catholic Church and the Protestant Churches. We started with an approach to ecumenism today, with an emphasis on spiritual ecumenism, to situate a context in which the theme of Mary can be deepened. The perspective that we adopted was the approach of the teaching of the Magisterium of the Church, according to Chapter VIII of the Constitution Lumen Gentium, with which we confronted the book of the Dombes Group Mary in the design of God and the Communion of Saints, that we took as the central point for this dissertation. This book was thoroughly investigated and we presented a summary of its content with its proposals of ecumenical interest. From the same book we raised the ideas that are dealt with in the final sections of the explanation. In these sections, we started by emphasizing aspects of the dialogue with the Anglican Roman Catholic International Commission (ARCIC) and the Lutheran World Federation. Next, we identified points of contact from the book of Dombes and from the Constitution Lumen Gentium with the Exhortation Marialis Cultus, as key to approximations on a vision of the figure of Mary, also taking into account the perspective of some other authors, in current contributions. We developed, in the end, some theological and pastoral aspects of the theme, still in an ecumenical perspective, and we pointed, in particular, to the elements that promote consensus among the Churches verified in the research. Methodologies and proposals that could serve as a basis for the development of ecumenical dialogue on Mary were prioritized.