This research aims to present elements that make up a Latin American Fundamental Theology. Such theology intends to explain the challenges of the Revelation of God in its context, marked not only by oppression and exclusion but also by a theology that pursues liberation. Fundamental Theology is investigated further as a discipline that seeks to justify the self-manifestation of God in history; the concept of Revelation, conceived from the challenges of Modernity and the intuitions of the Second Vatican Council; and Latin American Liberation Theology, as a perspective that understands Revelation from the point of view of the excluded. Through an interrelationship among the issues addressed, the research will seek to point out the main characteristics of a Fundamental Theology from a Latin American perspective: first, concerning the role of the poor, whether as a social place, hermeneutic place, or theological place; second, regarding the particularities of a Latin American Fundamental Theology, in which the recognition that God is present in history, the centrality of the preferential option for the poor, the need for the See, Judge, and Act Methodology, the uniqueness of the liberating ecclesial identity, along with the relevance of dialogical, critical, plural and transdisciplinary theological practice, and the constitution of a Latin American model of Fundamental Theology focused on liberation. A Latin American Fundamental Theology is, therefore, a reflection on the historicization of the Reign of God through excluded that can be recognized and described with them, from them, and in them, aiming for their liberation.