Sustainable health financing is critical in humanitarian settings to ensure that the most vulnerable populations have access to necessary healthcare services. In crises such as conflicts, natural disasters, or prolonged emergencies, healthcare systems are often destabilized, leading to significant challenges in providing adequate care. This review explores innovative financing mechanisms designed to support health services in these contexts, focusing on their potential to achieve Universal Health Coverage (UHC). Key challenges include limited funding, high out-of-pocket costs, and the uneven distribution of healthcare resources. In response, emerging models such as impact bonds, Islamic social finance, disaster risk insurance, and digital financial solutions offer new approaches to mobilizing resources and sustaining health interventions. These strategies are essential to bridging gaps in healthcare access, promoting equity, and strengthening the resilience of health systems. Policy recommendations highlight the importance of integrating emergency and routine health services, engaging communities, and enhancing coordination among stakeholders. Strengthening health financing mechanisms is vital for long-term improvements in health outcomes, especially in fragile settings. This research underscores the need for sustainable, inclusive policies that bolster health systems in the face of humanitarian crises.