| NNS | IEEE Neural Network Society 
| Others |
| NNS | Nakayoshi No Sataraito
| Others |
| NNS | Nanoscience and Nanotechnology Symposium
| Others |
| NNS | NANP Notification System
| Others |
| NNS | Nascar Nationwide Series
| Others |
| NNS | Nashville North Studios
| Others |
| NNS | National Network Solutions
| Others |
| NNS | National Neurotrauma Society
| Others |
| NNS | National Numeracy Strategy
| Others |
| NNS | Natural Number System
| Others |
| NNS | Near North Side
| Others |
| NNS | Nebraska Nepalese Society
| Others |
| NNS | Neighborhood News Service
| Others |
| NNS | Neighborhood Nuclear Superiority
| Others |
| NNS | NEO Name Service
| Others |
| NNS | Net National Saving
| Others |
| NNS | Net Nitrogen Synthesis
| Others |
| NNS | Netware Name Service
| Others |
| NNS | Network News Service
| Others |
| NNS | Network Node Server
| Others |
| NNS | Neural Network Stick
| Others |
| NNS | New Numeral Scheme
| Others |
| NNS | Newport Naval Station
| Others |
| NNS | Newport News Shipbuilding
| Others |
| NNS | Next Naming System
| Others |
| NNS | Nick N Stef
| Others |
| NNS | Nigerian Naval Ship
| Others |
| NNS | Nigerian Navy ship
| Others |
| NNS | Nissan Navigation System
| Others |
| NNS | Nitro Nation Stories
| Others |
| NNS | Non Native Speaker
| Others |
| NNS | Non Native Speakers
| Others |
| NNS | Non Native Speaking
| Others |
| NNS | Non Nutritive Sucking
| Others |
| NNS | Nonlinear Nonparametric Statistics
| Others |
| NNS | Northeast Nudist Society
| Others |
| NNS | Northern North Sea
| Others |
| NNS | Norwegian Neuroscience Society
| Others |
| NNS | Number Needed to Screen
| Others |