| Abbreviation | Definition |
|---|---|
| NRV | Naija Real Vibez |
| NS | NationStates |
| NT | Nitro Type |
| NWCP | Night Warriors Club Penguin |
| NWL | Northwest Lace |
| OBF | Official Bellybutton Forum |
| OCIA | OverClock Intelligence Agency |
| ODE | On Demand Environment |
| ODIGMA | Online Digtal Marketing |
| ODO | Or best offer |
| OFD | Open Fortress Deathmatch |
| OG | Open Graph |
| OGC | Online Gaming Cheats |
| OGRA | Online Gambling Regulation Act 2001 (Isle of Man) |
| OK | Odnoklassniki |
| OLBB | Online Banking for Business |
| OLCA | On-Line Corrosion Advisor |
| OLG | On-Line Gateway |
| OLH | On-Line Help |
| OMB | On My Block |