AAI
- AAI (album)
- AAI Corporation
- AAI Corporation Aerosonde
- AAI Sparrowhawk
- AAI underwater revolver
- AIESEC Alumni International
- Aai (film)
- Adam Aircraft Industries
- Adım Adım Initiative
- Africa-America Institute
- Ahrens Aircraft Inc
- Airline Ambassadors International
- Airports Authority of India
- Alliance Academy International
- Allied Artists International
- Alpha amylase inhibitor
- American Antitrust Institute
- American Association of Immunologists
- Andreyev Acoustics Institute
- Angeline Academy of Innovation
- Arab American Institute
- Architectural Association of Ireland
- Arifama-Miniafia language
- Arlington Asset Investment
- Arraias Airport
- Asian Arts Initiative
- Associação Atlética Iguaçu
- Atheist Alliance International
- Athletics Ireland
- Attachment measures
- Authentication and authorization infrastructure
- AutoAlliance International
- Aviation Industries Ilyushin
- Epinephrine autoinjector
- Fruit of the Loom
- JD Edwards