| N/O | Not Obligated 
| Others |
| NO | Nameless One
| Others |
| NO | Nameplate Output
| Others |
| NO | National Office
| Others |
| NO | National Organization
| Others |
| NO | Native Officer (colonial India)
| Others |
| NO | Navy Oscar
| Others |
| NO | Neither One
| Others |
| NO | Neos
| Others |
| NO | Nerf Online
| Others |
| NO | New Opportunity
| Others |
| NO | New Ordeals
| Others |
| NO | New Order
| Others |
| NO | New Orleans
| Others |
| NO | New Orleans Field Office
| Others |
| NO | New Orleans Saints
| Others |
| NO | Next Operating
| Others |
| NO | Next Opportunity
| Others |
| NO | Nitric Oxide
| Others |
| NO | No Office
| Others |
| NO | No Onions
| Others |
| NO | NO or
| Others |
| NO | Nobelium
| Element |
| NO | NObet
| Others |
| NO | Nodal Office
| Others |
| NO | Noise Ordnance
| Others |
| NO | Nomine Officii
| Others |
| NO | Non Oscillatory
| Others |
| NO | NordOsten
| Others |
| NO | Normal Open
| Others |
| NO | Normal Ordering
| Others |
| NO | Normal Output
| Others |
| NO | Norway
| Others |
| NO | Norwegian
| Others |
| no | Norwegian language
| Others |
| NO | Not for Off-KSC (Kennedy Space Center) Distribution
| Others |
| NO | Not Official
| Others |
| NO | Not On
| Others |
| NO | Not Open
| Others |
| NO | Not Optimized
| Others |
| NO | Not Organized
| Others |
| NO | Not Out
| Others |
| NO | Nothing The Opposite
| Others |
| NO | Novara (Provence)
| Others |
| No | Number
| Others |
| NO | Number Of
| Others |
| NO | Number One
| Others |
| NO | Numero
| Others |
| NO | Nursing Office
| Others |