| Abbreviation | Definition |
|---|---|
| NH | Number Holder |
| NHC | Namtrac Highway Coach |
| NI | Not Included |
| NIAP | Negative Ion Air Purifier |
| NIE | Numero de Identificacion de Extranjeros |
| NiMH | Nickel-Metal Hydride |
| NiMH | Nickel-Metal Hydride rechargeable battery |
| NIP | New In Package |
| NIPA | National Income and Products Accounts |
| NLGA | National Lumber Grades Authority (Canada) |
| NLPIP | National Lighting Product Information Program |
| NM | New Model |
| NM | Non-Metallic |
| NMM | Non-Metalic Metal |
| NMP | Net Material Product |
| NMP | New Map Pack |
| NMPA | National Medical Products Administration |
| NMPC | Niagara Mohawk Power Company |
| NMPL | Northeast Medical Products Laboratory |
| NMSC | Non-Metallic-Sheathed Cable |