| Abbreviation | Definition |
|---|---|
| GENF | Global Emergency Nuclear Fuel |
| GENTLE | Graduate and Executive Nuclear Training and Lifelong |
| GKN | Gemeenschappelijke Kernenergiecentrale Nederland (in Dutch) Common Nuclear Power Plant Netherlands |
| GND | Generalized Nuclear Data |
| GNF | Global Nuclear Fuel |
| GUNDAM | Giant Unrealistic Nuclear Dams Armed Masterfully (anime) |
| HNA | Human Nuclear Antigen |
| HNF | Hepatocyte nuclear factors |
| HNP | Horizon Nuclear Power |
| IANF | Inter Allied Nuclear Force |
| ICAN | Ion Compressed Antimatter Nuclear |
| ICNT | International Collaborations in Nuclear Theory |
| IDANT | International Day against Nuclear Tests |
| IJNA | Indo Japan Nuclear Agreement |
| INAA | Instrumental nuclear activation analysis |
| INARA | Iran Nuclear Agreement Review Act |
| INF | Irradiated Nuclear Fuel |
| INFS | Integrative Nuclear FGFR1 Signaling |
| INL | Idaho Nuclear Laboratory |
| INPA | Institute for Nuclear and Particle Astrophysics |