| Abbreviation | Definition |
|---|---|
| NBM | National Building Museum |
| NBM | New Brunswick Museum |
| NCAH | North Carolina Association of Historians |
| NCAM | Nepal Children's Art Museum |
| NCHMT | National Capital Historical Museum of Transportation |
| NCM | National Children's Museum |
| NCM | National Corvette Museum |
| NCM | National Corvette Museum's |
| NCM | National Cryptologic Museum |
| NCMA | Nassau County Museum of Art |
| NCMA | North Carolina Museum of Art |
| NCMC | North Carolina Museums Council |
| NCMF | National Cryptologic Museum Foundation's |
| NCMH | North Carolina Museum of History |
| NCMM | National Coal Mining Museum |
| NCMM | North Carolina Maritime Museum |
| NCRM | National Civil Rights Museum |
| NCSM | National Council of Science Museums |
| NCSML | National Czech & Slovak Museum & Library |
| NCSML | National Czech Slovak Museum Library |