| Abbreviation | Definition |
|---|---|
| NFTC | Northeast Forensic Training Center |
| NGG | Nasty Girly Gang |
| NGK | No Good Kind |
| NGNP | North Greenwood Neighborhood Patrol |
| NH | Not Human |
| NH&MP | National Highways & Motorway Police |
| NH&MP | National Highways & Motorway Police (Pakistan) |
| NHMP | National Highways & Motorway Police |
| NHMP | National Highways & Motorway Police (Pakistan) |
| NHPD | New Haven Police Department |
| NHS | National Health Service |
| NHSP | New Hampshire State Police |
| NI | National Insurance |
| NI | Non-Informative |
| NIFS | National Institute of Forensic Science |
| NIHHS | Notification of Installations Handling Hazardous Substances |
| NIK | Narcotics Identification Kit |
| NIM | National Intelligence Model |
| NIM | Non-Investigative Matter |
| Nina | 9-millimeter hand gun |