The sustainable blue economy lays a strong emphasis on utilising ocean resources responsibly in order to enhance livelihoods, preserve ecosystem health, and grow the economy. Financial technology, or fintech, has emerged as a major enabler, offering creative ways to eliminate financial gaps, enhance monitoring, and more efficiently manage ocean resources. In this chapter discusses how fintech may stimulate sustainable growth in the blue economy by concentrating on key issues including transparent resource management, scalable investment mechanisms, and inclusive financial systems. This chapter presents a conceptual framework for addressing economic, environmental, and social issues by fusing sustainable marine practices with technological advancements like blockchain, artificial intelligence, and the internet of things. Fintech’s practical implications in advancing sustainability are demonstrated through in-depth case studies, such as blockchain for Indonesian fisheries and crowdfunding for the restoration of coral reefs in the Caribbean. It also focuses on practical policy recommendations for incorporating fintech into nationally and globally blue economy strategies, like developing regulatory framework and strengthening cross-sector collaborations. The chapter concludes by highlighting fintech’s critical role in promoting sustainability, inclusion, and resilience in ocean-based economies, widening up opportunities for the accomplishment of more general sustainable development goals.