- IAEA
- see International Atomic Energy Agency (1956 - )
- ICRP
- see International Commission on Radiological Protection (1950 - )
- Institute of Nuclear Research (c. 1994 - ), Hungarian Academy of Sciences
- International Atomic Energy Agency (1956 - )
- International Atomic Energy Agency, Department of Nuclear Energy (1995? - )
- International Atomic Energy Agency, Department of Nuclear Safety (1995? - )
- International Atomic Energy Agency, Director General (1956? - )
- International Atomic Energy Agency, Division of Nuclear Fuel Cycle and Waste Technology (1995? - )
- International Atomic Energy Agency, Division of Radiation and Waste Safety (1995? - )
- International Atomic Energy Agency, International Radioactive Waste Advisory Committee (1989 - )
- International Atomic Energy Agency, Waste Management Advisory Programme (1987 - ?)
- International Atomic Energy Agency, Waste Management Assessment and Technical Review Programme (1989 - )
- International Atomic Energy Agency, Waste Safety Section
- International Atomic Energy Agency, Waste Technology Section
- International Commission on Radiological Protection (1950 - )
- International Radioactive Waste Advisory Committee (1989 - ), International Atomic Energy Agency
- International Society of Radiology (1925? - )
- International Society of Radiology, International X-ray and Radium Protection Committee (1928 - 1950)
- International X-ray and Radium Protection Committee (1928 - 1950), International Society of Radiology
- INWAC
- see International Radioactive Waste Advisory Committee (1989 - ), International Atomic Energy Agency
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