As the PEMSEA Regional Centre of Excellence (RCOE) in Marine Pollution, SKLMP took the lead in organising the East Asia Regional training workshop on monitoring and assessment of microplastics in marine environments on 9 December 2022. The workshop was delivered online via Zoom and well attended by 130 participants from governments, NGOs and academia in the region. More than ten speakers were invited to give lectures on various topics related to microplastics monitoring and assessment. A summary of the current status of microplastics in the seas of East Asia and worldwide was also presented by the workshop chairman, Dr. James Fang, together with two discussion sessions on monitoring approaches for microplastics in marine environments, and methods for toxicity assessment. This training workshop had succeeded in updating information on microplastics-related research, and also facilitating a closer collaboration between SKLMP members and scientists from the region.