| Abbreviation | Definition |
|---|---|
| NMUA | Northwest Metropolitan Urology Associates |
| NMUI | New Mexico Utilities, Inc. |
| NMUK | Nissan Motor Manufacturing, United Kingdom, LTD. |
| NMV | New Media Vision |
| NMV | Nybergs Mekaniska Verkstad |
| NMW | New Music Works |
| NMY | New Media Yuppies |
| NMY | Newcomer, Morris, & Young Advertising Agency |
| NMZ | NetMediaZone |
| NN | Nationale-Nederlanden |
| NNA | National Nephrology Associates |
| NNA | National Newspaper Association |
| NNA | Neal Nelson Associates |
| NNA | Nexon North America |
| NNA | Nickel Nation Amusements |
| NNB | Need New Body |
| NNB | Nikkei Net Business |
| NNB | Northern Native Broadcasting |
| NNBP | Nanobac Pharmaceuticals, Inc. |
| NNC | National Navigation Company |