The present thesis investigates a new form of dialogue among monks, the dialogue of experience, bringing into focus the psychosocial process of religious identity-alterity. The research is based on documents and testimonies of the Monastic Inter-religious Dialogue (MID), organism attached to the Vatican s Pontifical Council for Inter-religious Dialogue (PCID), that gathers monks from Catholic s monasteries of all the world participating at dialogue s commissions with monks of others religious traditions. Although recent, this type of dialogue indicates a renewable tendency in the occidental and oriental religions relationship; and it is fruit not only of the personal efforts of some pioneers, but also of religious and social transformations, that are accelerating in the actual world-wideness stage. Then, after presenting the monachism s foundations, having presented the differences among their main tendencies and the references to a common base, I situate the dialogue s development in the perspective of Christian monastic history, of the current context of religious pluralism and of Catholic s elaboration about this subject. The importance of this type of dialogue to the religious study s field lies in its experience s emphasis, in its association between dialogue and contemplation (or meditation) and in the sharing of monastic practices by the different religious traditions members. At the same time, as the monk s experience accounts are rooted in their personal and communitarian religious life and are orientated to testimony, they allowed an approach of historical representations that relates these representations to religious practices, to spiritual experiences and to life s histories of monks and monastic communities. The convergence of reflections coming from various fields toward experience has transform this one in a central point of reference around which it was possible to integrate these fields and establish the articulation of experience to testimony, narration and psychosocial process. Based on Ricoeur s hermeneutical phenomenology and on Nabert`s conception of religious consciousness, and having put in evidence the social psychology s contribution to clarify identityalterity s dynamic between the ego and the alter, this thesis analysis the sense, the formation and the consolidation of a new dynamic developed in the inter-monastic dialogue s context, studying it from the point of view of the catholic s monastic community and of their living and historical dialogue and contemplation s experience. This one breaks off with the separated subjectivities vision and with the negation and exclusion s of religious alterity, arriving to a unity in plurality s inter-subjectivity perspective and to a new type of catholic dialogical identity and spirituality. Having verified the central importance of this dynamic and its religious sense to the dialogue s development among contemplatives, the thesis stands out not only this dynamic s psychosocial dimension, but also its rooting in the deepest center of being, underlying relation established by catholic monks between the inter-religious dialogue and their dialogue with God. The Christian conception of God and fellow s alterity has been determinant to the dialogical mutual recognition and to the peace and harmony s monastic experiences among monks from different religions. The study of this conception and of its application on inter-monastic dialogue conducts to the distinction between this dialogical dynamics from the one established in terms of auto- affirmation and other s deny, that is related to the differences negation, to war, and to several kinds of alterity s elimination. The mutual recognition was favored for the monastic social rupture, for the contemplative practices and for the profound process of identityalterity s reformulation the monks go through in their path toward the Absolute. Nowadays, the recognition of Christian identity and religious alterity is being considered by these monks as central to their inter-religious dialogue, and is allowing them to revise their own identity going, at the same time, beyond negative historical representations about other religions and promoting an opening to other beings, cultures and religions. These monks consider that their catholic monastic tradition has been renewed by the spiritual hope and research of other traditions, and that dialogue is helping them to go deeper in their own Christian identity. The thesis describes their profound personal and communitarian transformations, the resistances and progress, as well as the changes in historical representations and spiritual experiences, provoking a great reformulation of catholic posture about others religions. The analyses of all this changes in relation with the contemporary Babel context put in relief the monastic contribution to a new dialogical perspective about unity in diversity of languages and beings, allowing distinguishing the vision of plurality in the recognition of identityalterity from others perspectives of unity and plurality based only on identity.