| Abbreviation | Definition |
|---|---|
| NEES | Network for Earthquake Engineering Simulation |
| NEFC | Northeast Fisheries Center |
| NEG | Numerical Experimentation Group |
| NEI | New England Ice |
| NEIC | National Earthquake Information Center |
| NELC | Naval Environmental Protection Act National Estuarine Research Reserve System |
| NEMO | iNdigenous Estuarine and Marine Organisms |
| NEMO | New Millennium Observatory |
| NEPC | Naval Environmental Protection Act |
| NERA | Nonlinear Earthquake Response Analysis |
| NERC | Natural Environment Research Council |
| NERRS | National Estuarine Research Reserve System |
| NES | National Energy Strategy |
| NESDRES | National Environmental Data Referral Service |
| NFC | National Finance Center |
| NFI | National Fisheries Center |
| NGM | Nested Grid Model |
| NGRS | National Geodetic Reference System |
| NGS | National Geodetic Survey |
| NH | Northern Hemisphere |