Blue finance has emerged as a critical instrument in supporting the sustainable use of ocean and freshwater resources, aligning closely with the objectives of the United Nations Sustainable Development Goals (SDGs), particularly SDG 6 (Clean Water and Sanitation), SDG 13 (Climate Action), and SDG 14 (Life Below Water). This empirical study investigates the extent to which blue finance contributes to achieving the SDGs by analyzing financial flows, investment patterns, and the performance outcomes of blue economy projects across selected coastal and island nations. Using a mixed-methods approach—combining econometric analysis of blue bond issuances, public and private investment data, and case studies of marine conservation and sustainable aquaculture initiatives—the study evaluates both environmental and socioeconomic impacts. The findings reveal that blue finance significantly enhances progress toward ocean-related SDGs by improving marine ecosystem health, strengthening climate resilience, and fostering inclusive economic growth in coastal communities. However, challenges remain in terms of regulatory frameworks, transparency, and measurement of blue-related impacts. The study concludes that scaling blue finance, supported by robust governance and standardized impact metrics, is essential for accelerating global SDG achievement and ensuring the long-term sustainability of the blue economy.