Marine plastics pollution is one of the most urgent environmental challenges of the 21st century. Tackling this problem means rethinking how plastics are produced, used and disposed of. From upstream to downstream, turning the tide on plastic pollution will require an all-hands-on-deck approach, involving producers, governments and consumers. Supporting this transition is the Regional Knowledge Centre for Marine Plastic Debris. Established under the Economic Research Institute for ASEAN and East Asia (ERIA) in 2019, the Knowledge Centre’s mission is to provide information and support to ASEAN+3 Member States, thereby helping them to improve the circularity of plastic and prevent leakage into marine environments. Our activities include the following: 1. Supporting research and data collection that contributes to science-based policy formulation. 2. Gathering and sharing scientific knowledge to support solution-orientated initiatives and build public awareness. 3. Facilitating national and regional capacity-building activities. 4. Developing strong collaborative networks and regional partnerships. 5. Promoting innovations from the private sector