| Abbreviation | Definition |
|---|---|
| NICS | National Instant Criminal Search |
| NICS | Northwest Intertribal Court System |
| NIEJI | National Indigenous Elder Justice Initiative |
| NIF | not in force |
| NIL | Negotiable Instruments Law |
| NILL | National Indian Law Library |
| NINA | New Identity Not Applicable |
| NIP | Naked In Public |
| NIP | Notice of Intended Prosecution |
| NIPAS | National Integrated Protected Areas System (Philippines) |
| NIPO | National Intellectual Property Office |
| NIPO | National Intellectual Property Organization |
| NIPRA | National Intellectual Property Researchers Association |
| NIRA | National Industrial Recovery Act |
| NITA | National Institute Of Trial Advocacy |
| NIWRM | Northern Ireland Women's Rights Movement |
| NJ | Nederlandse Jurisprudentie |
| NJ | No Justice |
| NJ | Non-Jury |
| NJA | Nevada Justice Association |