| Abbreviation | Definition |
|---|---|
| AA | Active Annual |
| AAAC | All Africa Anesthesia Congress |
| AABC | Advanced Automotive Battery Conference |
| AABF | Africa-Asian Business Forum |
| AABF | Albuquerque Antiquarian Book Fair |
| AAC | American Athletic Conference |
| AAC | Appalachian Athletic Conference |
| AACL | Anti Ageing Conference London |
| AACL | Anti Aging Conference London |
| AACSS | All Africa Conference Sister to Sister |
| AADC | Advanced Autonomous Drive Conference |
| AAFC | All America Football Conference |
| AAFC | All American Football Conference |
| AAFC | All-America Football Conference |
| AAFC | Asian American Footsteps Conference |
| AAMF | Avoyelles Arts Music Festival |
| AAMF | Avoyelles Arts & Music Festival |
| AAOC | Annual Affiliate Officers Conference |
| AAPC | African American Professionals Conference |
| AAPC | All-African Peoples' Conference |