| Abbreviation | Definition |
|---|---|
| NAPD | North Andover Police Department |
| NAPED | National Association of Police Equipment Dealers |
| NAPED | National Association of Police Equipment Distributors |
| NAPO | National Association of Police Organizations |
| NAPO | National Associations of Police Organizations |
| NAPS | Nishnawbe-Aski Police Service |
| NARPO | National Association of Retired Police Officers |
| NAS | No Age Statement |
| NASS | National Asylum Seekers Service |
| NAT | National Aptitude Test (Pakistan) |
| NATB | National Automobile Theft Bureau |
| NBA | Not By Accident |
| NBA | Now Being Arrested |
| NBFE | National Board of Forensic Evaluators |
| NBM | National Briefing Model |
| NBPA | National Black Police Association |
| NBSOIRC | New Brunswick Sex Offender Information Registration Center |
| NC | Nut Case |
| NC3 | National CyberCrime Coordination unit |
| NCCU | National Cyber Crime Unit |