The question about man appears again in contemporary philosophy no longer as an eidetic, but as an existential question (if itever ceased to be so). Martin Buber, Austrian-Jewish thinker (1878- 1965), seeks with his thought to recover the value of man, addingto the existentialist influences of Kierkegaard and Nietzsche, and to the phenomenological influence of Husserl, the dialogic principle;that is, the necessity of the other as a You for the becoming of the I as a person. This last concept, person, has its origin in the philosophical discourse in the Trinitarian and Christological Theology of the Fathers of the Church, among them, Augustine of Hippo. In this article we want to make explicit the presence of this Augustinian conception of person in the personalism of Martin Buber. To do so, we will identify the most important characteristics of the person for the bishop of Hippo, which are explained in detail in his work De Trinitate, and then we will link these characteristics with those that are central to Buber’s thought. Our hypothesis is that we can find in Buber’s anthropology traces of Augustine’s thought, influenced especially through existentialism and phenomenology.