The article analyzes the concept of the language norm as a key instrument for the formation and preservation of national identity in the linguistic and linguo-philosophical legacy of Ivan Ohіienko. Based on his fundamental works, in particular «Native Language», «The Science of Native Language Duties», and «Ukrainian Culture», the language norm is examined as a multidimensional phenomenon that integrates linguistic, cultural, spiritual, and ethical aspects. It is substantiated that, in Ivan Ohiienko’s interpretation, the language norm performs not only a regulatory function but also an axiological one, serving as a marker of national self-awareness, spiritual continuity, and cultural coherence. It is emphasized that for Metropolitan Ilarion, language was not merely a means of communication, but also a primary marker of a people’s cultural and spiritual identity, a key to shaping collective consciousness and the spiritual integrity of the nation. The article analyzes the lexical-stylistic and rhetorical means through which the scholar actualizes the idea of linguistic responsibility as a component of civic and national maturity. It is noted that, in Ohiіenko’s concept, the language norm fulfills several functions: a sacred marker – language as a temple and shrine of the people; an instrument of moral education – adherence to norms as a duty to the nation; a means of social cohesion – correct language shapes collective consciousness; a tool for preserving historical memory and cultural codes – through grammatical, lexical, and stylistic rules; and an identification mechanism – «one’s own» is contrasted with the «other» through linguistic and stylistic differences. It is proven that the language norm in Ivan Ohiienko’s works is a factor of the nation’s spiritual consolidation and an important element of its cultural security. His ideas remain relevant for contemporary language policy, education, and humanitarian discourse, opening prospects for further research into the language norm as a component of national security.