AAIA
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