| Abbreviation | Definition |
|---|---|
| AOCS | American Oil Chemist Society |
| AOCS | American Oil Chemists' Society |
| AOFAS | American Orthopaedic Foot Ankle Society |
| AOFAS | American Orthopedic Foot and Ankle Society |
| AOOP | Academy of Organizational and Occupational Psychiatry |
| AOP | Asociacin Odontolgica Panamea |
| AOP | Panamian Odontological Association |
| AOS | Academic Orthopaedic Society |
| AOS | American Ophthalmological Society |
| AOS | American Oriental Society |
| AOS | American Ornithological Society |
| AOS | American Orthodontic Society |
| AOS | American Otological Society |
| AOSA | American Orff-Schulwerk Association |
| AOSB | American Orchid Society Bulletin |
| AOSPRM | Asia Oceania Society of Physical and Rehabilitation Medicine |
| AOSPRM | Asia Oceanian Society of Physical and Rehabilitation Medicine |
| AOTC | Anthropology Of This Century |
| APA | Argentine Paleontological Association |
| APA | Asociacin Paleontolgica Argentina |