The blue economy is a development paradigm that emphasizes the sustainable use of marine resources by paying attention to ecological, social and economic aspects. Indonesia as a maritime country has great potential to develop a blue economy, but its implementation still faces various obstacles, both from a regulatory and institutional perspective. This article aims to analyze the strengthening of the blue economy law through the role of the Red and White Village/Subdistrict Cooperative as a forum for the people's economy. The research method used is a juridical-normative approach by examining related laws and regulations, legal doctrine, and cooperative institutional construction. The results of the analysis show that the Red and White Village/Subdistrict Cooperative normatively has the potential as an institutional instrument in supporting the blue economy through the function of organizing community businesses, strengthening the marine economic value chain, distributing economic benefits, and empowering coastal communities. However, the legal framework that regulates the relationship between cooperative law, maritime law and the principles of environmental sustainability still shows a fragmentation of norms so that harmonization of regulations and strengthening of sectoral policies is needed. The conclusions of this research are limited to a normative analysis of the legal design and institutional potential of cooperatives, not to measuring the actual effectiveness of cooperatives as blue economy actors because they have not been supported by empirical testing of institutional performance, governance capacity, or economic and ecological impacts at the community level. Further research needs to be directed at empirical studies regarding the effectiveness of the Red and White Village/Kelurahan Cooperatives in blue economy practices, including aspects of governance, access to financing, supply chains, environmental compliance, and their contribution to improving the welfare of coastal communities.