| Acronym | Definition |
|---|
| TNAS➣Tecnica Naturale Anti-Stress (Italian: Natural Anti-Stress Technique) |
| TNAS➣Triangle Native American Society (est. 1983; North Carolina) |
| TNAS➣Telephone Network Access Subsystem |
| TNAS➣Telephone Network Access System |
| TNAS➣Transmission Network Administration System |
| TNAS➣Trade Negotiations Analysis System (Australia) |