La Función Hermenéutica de la Septuaginta en la Configuración de la Cristología Primitiva y la Diferenciación Identitaria This study examines the hypothesis that the Greek Septuagint (LXX) functioned as a historically decisive mediating framework in the early articulation of Christological discourse and in the gradual differentiation between formative Judaism and the emerging Christian movement. Through a historical-critical and philological analysis, the paper evaluates how specific translational features of the LXX—particularly lexical shifts, semantic expansions, and the rendering of the Tetragrammaton as Kyrios—created conceptual conditions that enabled the reconfiguration of Israel’s scriptural traditions within a Hellenistic linguistic environment. Case studies such as Isaiah 7:14 (parthenos), Psalm 22:16 (ōryxan), and the titular application of Kyrios to Jesus are examined not as isolated prooftexts but as components of a broader textual ecosystem. The cumulative analysis suggests that the Septuagint did not merely transmit Hebrew traditions into Greek, but structurally influenced the interpretive horizon within which early Christological claims became intelligible and communicable in the Mediterranean world.