| Abbreviation | Definition |
|---|---|
| NITF | National Imagery Transmission Format |
| NITF | National Intelligence Transmission Format |
| NITFS | National Imagery Transmission Format Standard |
| NIU | NATO (North Atlantic Treaty Organization) Interface Unit |
| NIWA | Naval Information Warfare Activity |
| NIWG | Network and Infrastructure Working Group |
| NJG | NachtJaGd (Night Fighter) |
| NJI | Non- Judicial Instruction |
| NJROTC | Naval Junior Reserve Officer Training Corps |
| NJROTC | Naval Reserve Officer Training Corps |
| NJV | Not Just Victory |
| NJVC | New Jersey Volunteer Cavalry |
| NJW | New Jersey Wing |
| NJW | Not Just War |
| NK | No Kills |
| NKAWTG | No-one Kicks A** Without Tanker Gas |
| NKAWTG | No-one Kicks Ass Without Tanker Gas |
| NKC | New Kabul Compound |
| NKDA | Nagorno Karabakh Defense Army |
| NKG | North Korean Gooks |