Developed by Battelle, US EPA, and the Coordinating Body on the Seas of East Asia (COBSEA), the Proven Practice Guide to Improve Waste Management and Address Plastic Pollution in South-East Asia seeks to share good practices for improving waste collection and management, with the ultimate goal of reducing plastic pollution and improving solid waste management. The guide examines plastic pollution in Southeast Asia across several implementation areas, including stakeholder engagement, capacity building, implementation, social and behavior change, data and evaluation, and financing. This resource will be useful for waste practitioners, city managers, policy advocates, project implementors, and more. Additionally, the guide serves as a starting place for those looking to learn more about plastic pollution mitigation.