OHTA
| Acronym | Definition |
|---|---|
| OHTA | Office of Historical Trust Accounting (US DOI) |
| OHTA | Organ Historical Trust of Australia |
| OHTA | Office of Health Technology Assessment |
| OHTA | Ozark Highlands Trail Association (Fayetteville, AR) |
| OHTA | Ontario Heritage Tree Alliance (Toronto, Ontario, Canada) |
| OHTA | Ohio Hospital Telecommunications Association (Cleveland, OH) |