The Gaza Strip faces a severe and ongoing humanitarian crisis, shaped by decades of military occupation by Israel, political instability, economic collapse, and a comprehensive blockade. This study aims to determine the effectiveness of international humanitarian aid in Gaza and to assess the impact of foreign humanitarian interventions on local realities through a qualitative case study, using document analysis of UN reports, donor data, academic literature, and media sources from 2022 to 2025. The findings expose a stark disconnect between international aid commitments and their actual impact on the ground. Although donor states pledged significant funding, humanitarian access was systematically obstructed, averaging just 5 out of 500 essential aid trucks entering Gaza daily in May 2025, a 99% shortfall that crippled food, health, and WASH responses. Furthermore, only 9.8% of pooled-fund grants reached local NGOs in 2024, reflecting entrenched power asymmetries in aid distribution, strategic planning, and risk allocation. These figures point to a humanitarian system that remains externally driven and politically constrained. Drawing on Humanitarianism and Localization Theories, the study concludes that aid effectiveness requires not just resources, but structural reforms namely, direct funding to local actors, inclusive planning mechanisms, and monitored enforcement of access and neutrality commitments.