RIHN International symposia are held in English and allow a range of experts to discuss pressing environmental subjects.
| 1st | Water and Better Human Life in the Future |
| November 6-8, 2006 Kyoto International Conference Center | |
| 2nd | Asian Green Belt: Its Past, Present and the Future |
| October 30-31, 2007 Mielparque-Kyoto | |
| 3rd | The Futurability of Islands: Beyond Endemism and Vulnerability |
| October 22-23, 2008 RIHN Lecture Hall | |
| 4rd | The Dilemma of Boundaries: Toward a New Concept of Catchment |
| October 20-22, 2009 RIHN Lecture Hall |