ATHA
| 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) |