NIJ
| Acronym | Definition |
|---|---|
| NIJ | National Institute of Justice |
| NIJ | Nikon Imaging Japan (est. 1988) |
| NIJ | North Icelandic Jet (ocean current) |
| NIJ | Nigerian Institute of Journalism (Nigeria) |
| NIJ | New Invisible Joy (band) |
| NIJ | Network of Independent Journalists (est. 1993; Institute for Democracy in Eastern Europe) |