The economics, safety, and way of life of its littoral states depend on the Indian Ocean. India has been a major theater of world geopolitics. It is the inevitable lifeline of the global economy. One-third of the world’s populace lives in the rim countries, which face challenges with economic and sustainable development because they significantly rely on ocean resources for food. Consequently, the ocean’s resources are put under heavy pressures like that of marine degradation, habitat destruction, pollution, and over-exploitation. But if marine resources livelihoods and food security are to be secured, as well as sustainable development goals, then increasing blue economy through sustainable and all-inclusive development of ocean’s possessions must be bestowed as topmost priority of the region. The mammoth potential of the blue economy should start to dawn on diplomats striving for a “blue diplomacy.” To overcome gravity and guarantee sustainable development in the area, this chapter offers ways to improve the blue economy. This chapter is articulated in the following manner: Section I presents literature review of Blue Economy; Section II Sustainable Development Goals in Context of Blue Economy; Section III Geostrategic Location of India and Indian Ocean: Potentialities and Opportunities for India; Section IV Indian Diplomacy Through Blue Economy.