| Abbreviation | Definition |
|---|---|
| NCTM | National Capital Trolley Museum |
| NDM | Cooper Hewitt National Design Museum |
| NDS | National Dairy Shrine |
| NEAM | New England Air Museum |
| NEC | National Exhibition Centre |
| NELM | National English Literary Museum |
| NEMA | New England Museum Association |
| NFM | National Firearms Museum |
| NGA | National Gallery of Art |
| NGRM | Narrow Gauge Railway Museum |
| NHDA | Nederlands Historisch Data Archief |
| NHDC | Norwegian Historical Data Centre |
| NHM | National Health Museum |
| NHM | National Hellenic Museum |
| NHM | National Heritage Museum |
| NHM | Natural History Museum |
| NHM | Natural History Museum of Los Angeles County |
| NHM | Natural History Museum, London |
| NHM | NHMNatural History Museum |
| NHM | Norwegian History Museum |