SEAFDEC Training Department (SEAFDEC/TD) organized “Regional Training Course on the Liable Research Methods to Collect and Analyze the Marine Debris and Microplastic” from 24 to 31 January 2025 at SEAFDEC/TD, Samut Prakan, Thailand. There were 38 participants from SEAFDEC Member Countries who attended the training. The major envisaged output is to enhance human resources capacity on sampling and analysis of marine debris and microplastics both lecture and practical and also strengthen cooperation among SEAFDEC Member countries researchers on marine debris and microplastics in Southeast Asia region. To impart knowledge and understanding for the subjects in training, resource persons from Chulalongkorn University, Burapha University (Chanthaburi Campus), Kasetsart University, Kyushu University, Tokyo University of Marine Science and Technology, and SEAFDEC/TD were invited. This training is an activity of the project “Regional Collaborative Research and Capacity Building for Monitoring and Reduction of Marine Debris from Fisheries in Southeast Asia”.