This session focuses on international risk communication to mitigate direct/indirect effects caused by massive volcanic eruption. The 2010 Icelandic volcano Eyjafjallajokull eruption caused huge international air traffic disturbances, and left large economic and social impact to international community. Disaster management system or volcano monitoring systems are generally established and developed based on each country’s own regulation and purposes, however, the experience demonstrated necessity to develop international risk communication to mitigate transboundary effect caused by eruption. After 2010 eruption several new efforts were started. In Iceland, Catalogue of Icelandic Volcano was newly developed as an open-access web resource in English to share on-time eruption information with international community. In order to improve disaster response for volcanic eruption, International Civil Aviation Organization (ICAO) revised International Volcanic Ash Contingency Plan for North Atlantic (NAT) and European (EUR) Region, and annual Volcanic Ash Exercises (VOLCEX) are conducted. This session discusses how to improve international risk communication system to share information of volcanic eruption from different research disciplines such as disaster management, volcanology, environmental politics.