| Acronym | Definition |
|---|
| NTSA | Netware Telephony Services Architecture |
| NTSA | National Training and Simulation Association |
| NTSA | National Traffic Safety Administration (nonprofit organization) |
| NTSA | National Tuberous Sclerosis Association |
| NTSA | National Training Systems Association |
| NTSA | National Technical Services Association |
| NTSA | National Target Shotgun Association (UK) |
| NTSA | North Texas Shooting Academy (Allen, TX) |
| NTSA | Napthalenetrisulfonic Acid (sulfonic acid) |
| NTSA | New Talent Singing Awards (annual singing contest) |
| NTSA | Navy Tactical Support Activity |
| NTSA | North Texas Speakers Association |
| NTSA | Naval Telecommunications System Architecture |
| NTSA | National Trap Shooting Association |
| NTSA | Not This Stuff Again (polite form) |