| Abbreviation | Definition |
|---|---|
| NF | Norfolk Island |
| NG | Nigeria |
| NI | Nicaragua |
| NI | Niger |
| NISSC | National Information System Support Center |
| NL | Netherlands |
| NL | Newfoundland and Labrador |
| NMATS | National Meter Accounting and Tracking System |
| NMO | Non-Machinable Outside |
| NNSC | National Network Service Center |
| NO | No Office |
| NO | Norway |
| NP | Nepal |
| NR | Nauru |
| NS | Nova Scotia |
| NSN | National Stock Number |
| NT | Neutral Zone (Saudia Arabia/Iraq) |
| NTAC | National Test Administration Center |
| NU | Niue |
| NU | NUnavut |