| Abbreviation | Definition |
|---|---|
| NOO | Nation Of Order |
| NOX | Nation Of Xile |
| NRR | Nyte's Realm Radio |
| NRUM | New Religious UFO Movement |
| NSF | Nemoni Star Forces |
| NSFL | Not Safe For Life |
| NSS | Nanakaland Space Ship |
| NT | Non Tolkienian |
| NTBS | Ninja Turtle Bomb Squad |
| NTNM | Ninja Turtles The Next Mutation |
| NTT | New Teen Titans |
| NWE | New World Empire |
| OA | Order of Alequi |
| OATS | Official Assassin Travel Sustenance |
| OBHWF | One Big Happy Weasley Family |
| OBSF | Obligatory Science Fiction Reference (rec.arts.sf.written newsgroup) |
| OCC | Order of Chaos and Corruption |
| OD | Outcast Destroyers |
| ODN | One-Dimensional Noetherian |
| ODST | Orbital Drop Shock Troopers |