| Abbreviation | Definition |
|---|---|
| NHMA | Natural History Museum, Aarhus Denmark |
| NHMLA | Natural History Museum of Los Angeles County |
| NHMLAC | Natural History Museum of Los Angeles County |
| NHRM | National Horse Racing Museum |
| NHRM | National Human Rights Museum |
| NIAH | National Inventory of Architectural Heritage |
| NIM | National Infantry Museum |
| NIMC | Northern Ireland Museums Council |
| NJCM | New Jersey Children's Museum |
| NMA | Nasher Museum of Art |
| NMA | National Memorial Arboretum |
| NMA | National Museum of Antiquities |
| NMA | National Museum of Australia |
| NMA | Nevada Museum of Art |
| NMAA | National Museum of American Art |
| NMAF | National Museum of the U S Air Force |
| NMAG | National Museum and Art gallery |
| NMAI | National Museum of American Illustration |
| NMAI | National Museum of the American Indian |
| NMAO | National Museum of Art Osaka |