| Abbreviation | Definition |
|---|---|
| ASPI | Australian Strategic Policy Institute |
| ASPI | Autonomous Systems Policy Institute |
| ASPRI | Advanced Social and Political Research Institute |
| ASRI | American Sleep Research Institute |
| ASRI | Australian Space Research Institute |
| ASTI | Ammonia Safety Training Institute |
| ASTI | Annual Service Training Institute |
| ASTI | Arborist Safety Training Institute |
| ASVI | Alberta Sports Vision Institute |
| ATARI | Atari Technology and Research Institute |
| ATCI | Attachment Trauma Center Institute |
| ATEI | Asmara Teachers Education Institute |
| ATI | American Tradition Institute |
| ATI | Anthony Transformation Institute |
| ATI | Assessment Technologies Institute |
| ATI | Automotive Training Institute |
| ATII | Advanced Training Institute International |
| ATII | Air Traffic Institute International |
| ATIT | American Television Institute of Technology |
| ATLI | Auburn Transition Leadership Institute |