Abstract: India and the US have crossed the proverbial Rubicon in their bilateral ties, with maritime cooperation being the mainstay. The US-India navy-to-navy cooperation has emerged as the “best performing area of bilateral relationship”. The maritime domain including the Indian Ocean and the Indo-Pacific area has emerged as the domain for the identification of commonly perceptible threats and goals in the larger Asian maritime expanse. A series of developments, agreements and understandings has gradually been cementing the rubric of US-India maritime cooperation. This paper proposes to justify the hypothesis that maritime cooperation between the US and India is one of the primary mainstays of their bilateral cooperation, and that the proposition will only get stronger going forward. By analysing various steps in maritime cooperation between the two countries, the paper seeks to highlight the rationales for such cooperation; growing Chinese presence in the region, non-traditional threats, HA/DR cooperation, domain awareness, reconnaissance, intelligence gathering, regional stability, and balance of power. Full text available here.