This paper explain the Baltic Marine Environment Protection Commission / Helsinki Commission’s efforts to solve the environment problem of Baltic Sea. There are some problems on Balic Sea such as eutrophication, unsustainable shipping, unsustainable fishing, and marine litter. Helsinki Commission, an international governmental organization has been created for improving the Baltic Sea’s environment quality. This study uses the concept of international organization by Harold K. Jacobson and the concept of marine protected area (MPA). The international organization concept explain the effort of Helsinki Commission by its function as an international organization to make change to the Baltic Sea status into good quality according to the Baltic Sea Action Plan (BSAP) in 2021. Baltic Sea Action Plan focuses on reducimg eutrophication, biodiversity lose, hazardous susbtance, and regulating maritime activities. The second concept is marine protected area which explain one of Helsinki Commission function to create conservation area to preserve environment from the harmful human activities.