Found 4 full forms for NNSS
| Term | Full Form | Category |
|---|---|---|
| NNSS | Navy Navigation Satellite System 
| Others |
| NNSS | Navy Navigational Satellite System
| Others |
| NNSS | Nevada National Security Site
| Military, Defence, Weapon, Experiment, Facility, Research Center |
| NNSS | Nigerian Navy Secondary School
| Others |