| 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) |