Terrorism represents a persistent and evolving global threat, characterized by its political nature, deliberate targeting of non-combatants, and devastating societal impact. Despite international efforts, a universally agreed-upon definition remains elusive, complicating the global response. This study critically examines the efficacy of the United Nations' multifaceted approach to counter-terrorism, as articulated in its Global Counter-Terrorism Strategy and operationalized through a coordinated system of entities like the UN Office of Counter-Terrorism (UNOCT). The research is guided by a central hypothesis: that an effective and sustainable response to terrorism is contingent upon a comprehensive, rights-based, and cooperative framework, as opposed to predominantly militarized or unilateral state actions. Employing a qualitative, doctrinal methodology, this analysis is grounded in a systematic review of primary UN documents and secondary academic literature. It investigates the fourpillar strategy-addressing conducive conditions, preventing and combating terrorism, building state capacity, and upholding human rights-to assess its coherence and implementation challenges. The study explores key research questions, including the impact of socioeconomic programs on reducing terrorist recruitment, the balance between security measures and civil liberties, the challenges posed by digital terrorist tactics, and the operational impediments created by the lack of a universal definition. The analysis concludes that the UN's holistic model provides a viable and necessary blueprint for sustainable counter-terrorism by integrating security, development, and human rights. However, significant challenges persist, including political obstruction, the agile use of digital platforms by terrorists, and difficulties in maintaining the security-liberty equilibrium at the national level.