ENSI is represented in the following national and international bodies:

• United Nations (e.g. IAEA, UNSCEAR)
• OECD (e.g. NEA)
• Regional organisations (e.g. WENRA, ENSREG)
• Bilateral bodies (e.g. Deutsch-Schweizerische Kommission (DSK), Commissione Italo-Svizzera (CIS), Commission franco-suisse (CFS))
• Swiss internal administrative bodies
• Higher education and research bodies
• National and international professional associations