The scoping study serves as a preliminary assessment of the current mercury waste management systems and practices in the ASEAN member states (AMS). It is aimed at identifying the current available sources of the relevant information, summarizing the essential information, and identifying gaps of information, challenges, needs and opportunities for further studies or actions. This study covers all AMS jurisdictions, while sector-wise, it focuses on Mercury in the Artisanal and Small-scale Gold Mining (ASGM); Mercury waste from the chemical manufacturing industry using the Chlor- Alkali process; as well as mercury in fluorescent lamps from industry and household sources. In terms of the Hazardous Waste Management (HWM) aspects under the BC Art. 4 and MC Art. 11, the study covers policies; legislative and regulatory framework; institutional framework; main sources/generators, waste prevention and minimization; handling, separation, collection, packaging and labelling, transportation, storage; treatment and disposal; and contaminated sites.