| Abbreviation | Definition |
|---|---|
| NMNH | National Museum of Natural History |
| NMNI | National Museums Northern Ireland |
| NMNS | National Museum of Natural Science |
| NMO | Naturkunde Museum Ostkreuz |
| NMPS | National Museum Publishing Seminar |
| NMRD | National Museum of Roller Derby |
| NMRN | National Museum of the Royal Navy |
| NMS | National Museum of Scotland |
| NMSC | Northeast Museum Services Center |
| NMSI | National Museum of Science and Industry |
| NMST | National Museum of Science and Technology |
| NMTL | National Museum of Taiwan Literature |
| NMV | National Museum Volunteers |
| NMWA | National Museum of Western Art |
| NMWA | National Museum of Wildlife Art |
| NMWA | National Museum of Women in the Arts |
| NNC | National Numismatic Collection |
| NNM | Nara National Museum |
| NNMCC | Nikkei National Museum Cultural Centre |
| NNMCC | Nikkei National Museum & Cultural Centre |