| Acronym | Definition |
|---|
| ATHA➣American Trail Horse Association |
| ATHA➣Anacostia Trails Heritage Area (Hyattsville, MD) |
| ATHA➣Advanced Training Program on Humanitarian Action |
| ATHA➣Alliance Theatrale Haitienne (Montreal, Quebec, Canada) |
| ATHA➣Association of Traditional Hunting Archers |
| ATHA➣Adrenal Tyrosine Hydroxylase Activity (biochemistry) |