| Abbreviation | Definition |
|---|---|
| ATMI | American Textile Manufacturers Institute |
| ATRI | Ankerberg Theological Research Institute |
| ATSI | Air Transport Safety Institute |
| ATTI | Arizona Technical Testing Institute |
| ATVI | Afghanistan Technical Vocational Institute |
| AUDI | Arab Urban Development Institute |
| AUI | Advanced Urology Institute |
| AVIT | Aarupadai Veedu Institute of Technology |
| AVSI | Aerospace Vehicle Systems Institute |
| AWAI | American Writers and Artists Institute |
| AWAI | American Writers Artists Institute |
| AWCI | American Watchmakers-Clockmakers Institute |
| AWEI | African Wildlife Economy Institute |
| AWI | Advanced Welding Institute |
| AWI | Aging Well Institute |
| AWI | Alfred Wegener Institute |
| AWI | Angklung Web Institute |
| AWPI | American Wood Preservers Institute |
| AWRI | Australian Wine Research Institute |
| AWWI | American Wind Wildlife Institute |