This study investigates how Financial Technology (FinTech) contributes to the development of a sustainable finance ecosystem in Middle Eastern countries with a focus on Saudi Arabia, the UAE, Qatar and Kuwait. The research uses a qualitative research design and secondary data, the study evaluates the current state of FinTech adoption, its role in advancing ESG-led financial practices and the barriers limiting effective implementation. The findings shows that strong growth in digital financial services but persistent challenges related to regulation, infrastructure and technological capability. The study concludes with policy recommendations to improve FinTech-driven sustainability and long-term financial resilience across the region.