This report was prepared by the United Nations Environment Programme (UNEP) and the Coordinating Body for the Seas of East Asia (COBSEA) Secretariat to provide legal guidance to COBSEA member countries requesting assistance on tackling marine liter. This assessment has been carried out at the request of the Cambodian government through the Ministry of Environment. The main objective is to conduct a gap analysis and assessment of marine litter related legal frameworks in Cambodia, within the context of the issue in the East Seas region. The outcome is a set of recommendations on interventions for the development and/or strengthening of laws and policies on marine litter (land and sea-based sources with a focus on plastics), to align with global efforts and best practices on the issue. Marine litter is one of the most insidious forms of ocean pollution. Most of it originates on land and about 80% is comprised of plastic waste. Plastics are the largest, most harmful and most persistent fraction of marine litter, accounting for at least 85 % of total marine waste. Accumulation of plastic wastes in the marine ecosystem is growing rapidly given production and consumption patterns, particularly of single-use plastics. In addition, unsustainable plastic waste management practices, particularly of land-based sources are recognized as the main cause of marine plastic pollution.