- AAI stands for Arab American Institute (Washington, DC)
- AAI stands for American Association of Immunologists
- AAI stands for Atheist Alliance International
- AAI stands for All Appropriate Inquiry
- AAI stands for AirTran Holdings, Inc. (Nevada and Florida)
- AAI stands for Analisi Ambientale Iniziale (Italian: Initial Environmental Assessment)
- AAI stands for Airport Authority of India
- AAI stands for Accredited Adviser in Insurance