| Acronym | Definition |
|---|
| HTRA➣Humboldt-Trinity Recreation Alliance (California) |
| HTRA➣Human Trafficking Rescue Alliance |
| HTRA➣High Time Resolution Astrophysics |
| HTRA➣Homeowner Tax Relief Act |
| HTRA➣Harding Township Recreation Association (New Vernon, NJ) |
| HTRA➣HoofBeats Thoroughbred Racing Association |