This report fills and identifies some of the existing information gaps by providing a synthesis of social and economic impacts and their gender and human rights dimensions. Information emerging from this report is central to strengthening the science-based evidence necessary for inclusive action on marine plastic litter – action that internalizes the social, economic, environmental and rights-related costs of plastic mismanagement. The findings from this report, as well as further findings from the SEA circular initiative, will be used to leverage support from South East Asian intergovernmental mechanisms, engage stakeholders with a marine focus, and enable government partners in target countries to bridge existing policy gaps and address upstream sources of pollution. The premise of the initiative and this report is that marine plastic litter needs to be tackled through a lifecycle approach with close consideration of gender equality and human rights issues, from plastic production on land and use by consumers to its disposal and possible leakage into the ocean. The focus lies on inclusive circular plastic management upstream in the plastic value chain to prevent plastic waste entering the environment. While removing existing marine litter is important, the downstream costs of clean-up and management may outweigh impact