| NGSA | National Grade Six Assessment 
| Others |
| NGSA | Natural Gas Service Agreement
| Others |
| NGSA | Natural Gas Supply Association
| Others |
| NGSA | Neag Graduate Student Association
| Others |
| NGSA | Neuroscience Grad Student Association
| Others |
| NGSA | Neuroscience Graduate Student
| Others |
| NGSA | Neuroscience Graduate Student Association
| Others |
| NGSA | Neuroscience Graduate Students' Association
| Others |
| NGSA | Next Generation Science Assessment
| Others |
| NGSA | Next Generation STEAM Academy
| Others |
| NGSA | Nigerian Geological Survey Agency
| Others |
| NGSA | Noblesville Girls Softball Association
| Others |
| NGSA | North Garland Sports Association
| Others |
| NGSA | North Georgia Sports Academy
| Others |
| NGSA | Northampton Girls Softball Association
| Others |
| NGSA | Northbrook Girls Softball Association
| Others |
| NGSA | Northridge Girls' Softball Association
| Others |
| NGSA | Nursing Graduate Student Association
| Others |
| NGSA | Nutrition and Gender Sensitive Agriculture
| Others |