| AAAAA | AHo's Amazing Atlas of Antibody Anatomy 
| Others |
| AAAAA | All American Association Against Acronym
| Others |
| AAAAA | Always Active Art Awesomeness Algorithm
| Others |
| AAAAA | American Association Against Acronym Abuse
| Others |
| AAAAA | American Association Against Alliteration Abuse
| Others |
| AAAAA | American Association for Awesomely Annoying Abbreviations
| Others |
| AAAAA | American Association for the Abolition of Abbreviations and Acronyms
| Others |
| AAAAA | Amicale Angevine des Amoureux des Automobiles Anciennes
| Others |
| AAAAA | Amicale Athoise Amateur Automobiles Anciennes
| Others |
| AAAAA | Anderson African American Alumni Association
| Others |
| AAAAA | Anonym Association Against Acronym Abuse
| Others |
| AAAAA | apple a corn at pat
| Others |
| AAAAA | Association d'Amis et d'Amateurs d'Automobiles Anciennes
| Others |
| AAAAA | Association of Absolute Apologists Alfons Alle
| Others |