- HAEA
- see Hungarian Atomic Energy Authority, Government of the Republic of Hungary
- Heat generating waste (c. 2000 - ), Radioactive waste
- HGW
- see Heat generating waste (c. 2000 - ), Radioactive waste
- High level waste (2000 - ), Radioactive waste
- Hungarian Academy of Sciences (1825 - )
- Hungarian Academy of Sciences, Central Research Institute for Physics (1950 - )
- Hungarian Academy of Sciences, Institute of Nuclear Research (c. 1994 - )
- Hungarian Academy of Sciences, Solymár Repository (1959 - 1980?)
- Hungarian Atomic Energy Authority, Government of the Republic of Hungary
- Hungarian Atomic Energy Authority, Central Nuclear Financial Fund
- Hungarian Atomic Energy Authority, Fund Management Unit
- Hungarian Atomic Energy Authority, Nuclear Safety Directorate
- Hungarian Atomic Energy Commission, Government of the Republic of Hungary
- Hungarian Geological Survey, Government of the Republic of Hungary
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