(en) The theme of truth in the work of Alasdair MacIntyre has rarely been developed. The present thesis aims at filling this lack. In a long first part the goes in details through the whole of MacIntyre's work with a special attention to the item of truth, which is omnipresent. This heuristic part leads to a hermeneutic part, in which the thought of the Anglo-Saxon philosopher is compared with that of Hans-Georg Gadamer - to whom he affirms to be widely indebted - in order to discern the proper of the Macintyrian researcher and that of his access to truth, which he considers as absolute. The unifying thread of it is the dichotomy Aristotle vs. Heidegger in Gadamer's work. This dichotomy, which is suggested by the Anglo-Saxon philosopher, proves to be an important key of interpretation of his thought in the field of hermeneutic. In a third part the author studies a diversity of themes for a right understanding of the Macintyrian conception of truth: today's context of plurality of traditions and civilisations, Macintyrian Thomism, the absolute and what is relative and truth as a good. This thematic part is built upon a confrontation with the thought of the second Hilary Putnam, that of "Reason, Truth and History", which is used as a safeguard in the work of MacIntyre when he tries to define the conception of truth in the tradition rationality. The author makes some critics of MacIntyre's thought, notably on the credit given to human rationality: the Anglo-Saxon philosopher does not seem to understand the limits proper to it, on theoretical level and practical level as well.