| Abbreviation | Definition |
|---|---|
| AIR | Association of Independent Retirees |
| AIRA | American Immunization Registry Association |
| AIRA | American Indian Republican Alliance |
| AIRC | Advanced Imaging Research Center |
| AIRC | American Information Resource Center |
| AIRD | Association of Ingersoll-Rand Distributors |
| AIRT | Association for Imago Relationship Therapists |
| AISA | Arsenal Independent Supporters Association |
| AISC | American Institute of Steel Construction |
| AISC | Associazione Italiana Studi Cinesi |
| AISECT | All India Society Electronics and Computer Technology |
| AISI | American Iron and Steel Institute |
| AISJ | Association Internationale des Sciences Juridiques |
| AISNE | Association of Independent Schools in New England |
| AITC | American Institute of Timber Construction |
| AITC | Association of International Tax Consultants |
| AITP | Association of Information Technology Professionals |
| AITT | The Association of Industrial Truck Trainers |
| AITU | Association for Independent Technological Universities |
| AIVF | Association of Independent Video and Filmmakers |