This Study was undertaken under the ASEAN-EU Partnership on Circular Economy through E-READI programme. It is a result of joint effort and extensive consultation among the Institute of Global Environmental Strategies (IGES), the European Commission, and the ASEAN Member States through the ASEAN Working Group on Coastal and Marine Environment, the ASEAN Working Group on Environmentally Sustainable Cities, the ASEAN Working Group on Chemicals and Waste, and other relevant stakeholders. The study is the newest initiative contributing to the ASEAN's commitment and efforts in combating marine debris pollution in the region, namely the Bangkok Declaration on Combating Marine Debris in ASEAN Region and the ASEAN Framework of Action on Marine Debris. The study provides an overview of where ASEAN is in terms of plastics management, what ASEAN Member States can do individually and collectively to move towards circular economy, and how collaboration and partnership can support the regional action.