Since 1945, the United Nations (UN) has played a central role in shaping the global order through its laws, norms, and institutions. As a founding member, Türkiye has consistently engaged with the UN, balancing its commitment to multilateralism with evolving national interests. This study examines Türkiye’s role within the UN system, exploring its historical trajectory, pursuit of legitimacy, and status as an emerging power. While Türkiye remains committed to the UN’s ideals, it also advocates for institutional reforms, as reflected in President Erdoğan’s call that “The World Is Bigger than Five.” Türkiye’s engagement spans the “Three UNs” framework, contributing to the organization’s normative, bureaucratic, and operational dimensions. Despite the challenges, Türkiye continues to see the UN as a crucial platform for multilateral diplomacy and global governance.