Over the past decade, Turkish foreign policy -under the strategic vision of the "Century of Türkiye"- has been oriented toward recalibrating its role in the regional power geometry and repositioning itself within the evolving global order. This strategic shift has been driven by a reengineering of national capabilities, an expansion of influence across its geopolitical periphery, and a proactive engagement in multilateral institutional frameworks. Turkey's strategic intentions have coalesced around four pillars: institutionalization of foreign relations, reconstruction of regional security architecture, geopolitical welfare-building, and global meaning-making—each functioning as a mechanism for consolidating Ankara's role within a transforming international system. This study, adopting an analytical-comparative approach, investigates the reverberations of Turkey’s strategic posture on the Islamic Republic of Iran. The findings indicate that the rivalry between the two regional powers has transcended conventional geopolitical contestation, evolving toward symbolic, structural, and normative competition. Turkey’s strategic conduct—manifested through multilateral institutionalism, human-centric diplomacy, and regional welfare initiatives—has disrupted discursive equilibria and triggered a recalibration of Iran's regional role conception. Iran’s response to these shifts has involved the adoption of recalibrative, balancing, and reconstructive strategies—observable across its security doctrine, institutional engagements, and soft power instruments. Furthermore, the research highlights that the Iran–Turkey strategic rivalry is no longer confined to traditional paradigms of hard power competition, but is increasingly shaped by emerging regional interfaces, normative articulation of order, and the rewriting of power narratives in West Asia. This dynamic necessitates a rethinking of power fluidity through the lens of multi-layered interaction and the strategic innovation of foreign policy instruments.