| Acronym | Definition |
|---|
| CTHA | Chemical Tariff Harmonization Agreement |
| CTHA | Canadian Table Hockey Association (Canada) |
| CTHA | Colorado Tier Hockey Association |
| CTHA | Centro Tecnico Hondureño Aleman (Spanish: Honduran German Technical Center; school) |
| CTHA | Center for Theory and History of Architecture |
| CTHA | Contrawound Torodial Helical Antenna (also seen as CWTHA) |
| CTHA | Columbus Travel Hockey Association (Georgia) |
| CTHA | Colonial Treasure Hunters Association |
| CTHA | Christian Treasure Hunters Association |
| CTHA | Connecticut Volunteer Heavy Artillery regiment |