AAIA may refer to:
- Aden-Abyan Islamic Army, Islamist group, Yemen
- Air Accident Investigation Authority, a Hong Kong government agency
- Associate of the Association of International Accountants, see Association of International Accountants#Membership
- Association on American Indian Affairs
- Australian Archaeological Institute at Athens, foreign archaeological institute in Greece
- Automotive Aftermarket Industry Association, former name of the Auto Care Association
- Australian Adult Industry Awards Australian pornography award since 2001