This chapter examines the potential emergence of a BRICS (Brazil, Russia, India, China, and South Africa)-led interregional maritime security agenda in a shifting international order, where United States’ (U.S.) dominance gives way to a more multiplex configuration. It applies a literature review of policy documents on maritime security from BRICS members, both individually and collectively. The study identifies growing collaboration among BRICS countries in maritime security, including joint exercises, information sharing, and capacity building in military, energy, economic, and environmental domains. These efforts reflect shared interests rooted in vast maritime territories and strategic ambitions across the South Atlantic and Indo-Pacific. While BRICS maritime cooperation aligns with broader geopolitical goals, institutional hurdles and strategic divergences may hinder the formation of a cohesive interregional agenda. The chapter argues that BRICS holds potential to shape a “Blue BRICS” framework, but its success depends on managing internal differences and articulating a common maritime security vision that supports long-term geopolitical objectives across both regions.