| Abbreviation | Definition |
|---|---|
| AACT | American Association of Christian Therapists |
| AACTS | Africa American Consortium of Theological Studies |
| AAEI | Ancient Ancestral Enterprising Individual |
| AAEO | Annie Armstrong Easter Offering |
| AALC | American Association of Lutheran Churches |
| AAMD | African American Mobilization Division |
| AAMM | Antananarivo Annual and Missionary Magazine |
| AAMO | Afghan American Muslim Outreach |
| AAOC | Albanian Autocephalous Orthodox Church |
| AAOM | Ann Arbor Orthodox Minyan |
| AAPC | American Association of Pastoral Counselors |
| AAR | American Academy of Religion |
| AASG | Agnostic and Atheist Student Group |
| AASG | Atheist And Agnostic Student Group |
| AASS | Asia Adventist Seminary Studies |
| AAU | American Apostolic Union |
| AAWC | All About Wicca Circular |
| AB | Amazingly Blessed |
| AB | American Baptist |
| ABAC | Association of Business Administrators of Christian |