| Abbreviation | Definition |
|---|---|
| AOIR | Association of Internet Researchers |
| AOK | Association of Knowledgework |
| AOM | Association of Ontario Midwives |
| AOMA | Arizona Osteopathic Medical Association |
| AOMA | Arkansas Oil Marketers Association |
| AOMA | Arkansas Osteopathic Medical Association |
| AONA | Australian Ophthalmic Nurses Association |
| AONT | Association of Nazarene Technologists (Kansas City, MO) |
| AOOMKA | All Okinawan Ozark Mountain Karate Association |
| AOP | Association of Office Professionals |
| AOP | Association of Online Publishers |
| AOP | Association of Person |
| AOP | Association of Persons |
| AOPA | Aircraft Owners and Pilots Association |
| AOPA | Airplane Owners and Pilots Association |
| AOPA | American Orthotic Prosthetic Association |
| AOPE | Association of Professional Evaluators |
| AOPN | Association of Outsourcing Practitioners of Nigeria |
| AOPN | Association of Outsourcing Professionals of Nigeria |
| AOPP | Association des Organisations Professionnelles Paysannes |