| Abbreviation | Definition |
|---|---|
| AOI | Alliance One International |
| AOIN | Alliance of Independent Nations |
| AOM | Alliance for Open Media |
| AORA | Atlantic Ocean Research Alliance |
| AORMA | Auxiliary Organization Risk Management Alliance |
| AORMA | Auxiliary Organizations Risk Management Alliance |
| AORTA | Anti Oppression Resource and Training Alliance |
| AOTG | Alliance Of The Griffin |
| AOTR | Alliance of Ohio Trauma Registrars |
| APANO | Aboriginal Peoples Alliance of Northern Ontario |
| APBA | American Progressive Bag Alliance |
| APBI | Alliance of Professional Bowlers International |
| APCA | Alliance for Physician Certification and Advancement |
| APEG | Alliance of Professionals for Economic Growth |
| APGA | All Progressive Grand Alliance |
| APGA | All Progressives Grand Alliance |
| APHA | Alliance of Professional Health Advocates |
| APKD | Alliance for Paired Kidney Donation |
| APLM | Alliance of Pigeon Lake Municipalities |
| APMD | Alliance for the Prevention of Mental Disorders |