NJ
| Acronym | Definition |
|---|---|
| NJ | New Jersey (US postal abbreviation) |
| NJ | Nice Job |
| NJ | National Jewish (Medical & Research Center) |
| NJ | No Joke |
| NJ | Nick Jonas (of Jonas Brothers) |
| NJ | New Jack (pro wrestler) |
| NJ | Neighbor-Joining |
| NJ | Norma Jean |
| NJ | Norsk Journalistlag (Norway) |
| NJ | Not Joking |
| NJ | Nasojejunal (feeding tube) |
| NJ | Nidec Corporation (Japan) |
| NJ | Norges Juristforbund (Norway) |
| NJ | Not Judgeable (skydiving competitions) |
| NJ | Occupation Postage Due (Scott Catalogue prefix; philately) |
| NJ | Napierville Junction Railway Company |