| NTSA | National Target Shooting Association 
| Others |
| NTSA | National Theatre for Student Artists
| Others |
| NTSA | National Training and Simulation Association
| Others |
| NTSA | National Training Systems Association
| Others |
| NTSA | National Transport and safety Authority
| Others |
| NTSA | National Tuberous Sclerosis Association
| Others |
| NTSA | Neighborhood Traffic Safety Alliance
| Others |
| NTSA | Netware Telephony Services Architecture
| Others |
| NTSA | Network Technology and Systems Administration
| Others |
| NTSA | Networking Technical Support Alliance
| Others |
| NTSA | Neuronal Time Series Analysis
| Others |
| NTSA | New Talent Singing Awards
| Others |
| NTSA | Nnational Training Systems Association
| Others |
| NTSA | Non-Traditional Student Association
| Others |
| NTSA | North Texas Shooters Association
| Others |
| NTSA | North Texas Suzuki Association
| Others |
| NTSA | Northeast Tennessee Sports Association
| Others |