| Abbreviation | Definition |
|---|---|
| AAMI | American Academy McAllister Institute |
| AAMI | Ancient Art Midwifery Institute |
| AANSI | ANSI American National Standards Institute |
| AARI | Arctic and Antarctic Research Institute |
| AARI | Ayub Agricultural Research Institute |
| AARINENA | Association of Agricultural Research Institutions in the Near East and North Africa |
| AATI | American Advanced Technicians Institute |
| ABFI | Adam Beach Film Institute |
| ABI | American Barber Institute |
| ABI | American Biographical Institute |
| ABI | American Butter Institute |
| ABI | Anita Borg Institute |
| ABIA | Austen BioInnovation Institute in Akron |
| ABIDE | Amagara Bible Institute Discipleship and Evangelism |
| ABMI | Alberta Biodiversity Monitoring Institute |
| ABRI | Architecture and Building Research Institute |
| ABSI | Advanced Brain and Spine Institute |
| ACCI | American Community Corrections Institute |
| ACCI | American Corporate Counsel Institute |
| ACEI | Academic Credentials Evaluation Institute |