| Acronym | Definition |
|---|
| AIA | American Institute of Architects (Washington, DC; business support; est. 1857) |
| AIA | Archaeological Institute of America |
| AIA | Aerospace Industries Association |
| AIA | Athletes In Action (Ministry of Campus Crusade for Christ International) |
| AIA | Anguilla (ISO Country code) |
| AIA | Applications Integration Architecture |
| AIA | American Insurance Association |
| AIA | Automotive Industries Association |
| AIA | Arizona Interscholastic Association |
| AIA | Athens International Airport |
| AIA | Authority Information Access (digital certificates) |
| AIA | Air Intelligence Agency |
| AIA | Automated Imaging Association |
| AIA | Associazione Italiana Arbitri (Italian Soccer Referee Association) |
| AIA | Anchorage International Airport |
| AIA | ASEAN Investment Area |
| AIA | Accuracy in Academia |
| AIA | Accessibility Interoperability Alliance (Wakefield, MA) |
| AIA | Adventures in Attitudes (Corexcel program) |
| AIA | Adventures in Advertising |
| AIA | Apiary Inspectors of America |
| AIA | Atelier Industriel de l'Aéronautique (French: Aeronautics Industrial Workshop) |
| AIA | Art Institute of Atlanta |
| AIA | Association for Industrial Archaeology (UK) |
| AIA | Access to Information Act (Canada) |
| AIA | Association of Indians in America |
| AIA | American Infertility Association |
| AIA | Atmospheric Imaging Assembly |
| AIA | Afghan Interim Administration |
| AIA | Asphalt Industry Alliance (Mineral Products Association and Refined Bitumen Association; UK) |
| AIA | Apologies In Advance |
| AIA | Aspirin Intolerant Asthma |
| AIA | Asbestos Information Association |
| AIA | Authorized Inspection Agency |
| AIA | Architectes Ingénieurs Associés (French architecture and engineering firm) |
| AIA | Alliance, NE, USA (Airport Code) |
| AIA | Automated Image Analysis |
| AIA | Alliance of Iranian Americans (California) |
| AIA | American Importers Association |
| AIA | AI Aardvark (Microsoft Flight Simulator) |
| AIA | American Iatrogenic Association |
| AIA | Artists International Association |
| AIA | Army Intelligence Agency |
| AIA | Association d'Improvisation Antiboise (French theater improvisation association) |
| AIA | Active Integrated Antenna |
| AIA | Associate of the Institute of Actuaries (UK) |
| AIA | Agudath Israel of America |
| AIA | Atlantic Institute of Aromatherapy |
| AIA | Artificial Intelligence Application |
| AIA | Association for Investor Awareness |
| AIA | American International Association for Economic and Social Development |
| AIA | Association of Instructional Administrators |
| AIA | Army International Activities |
| AIA | Aluminum Interlocked Armor (cable sheath) |
| AIA | Aestheticians International Association |
| AIA | Australasian Incentive Association |
| AIA | Association of Insolvency Accountants |
| AIA | Association des Internationaux d'Aviron (French: International Association of Rowing) |
| AIA | Abbotsford International Airport |
| AIA | Army Information Architecture |
| AIA | Alternate Interior Angle (geometry) |
| AIA | Audio Indicate Active |
| AIA | Appreciated in Advance |
| AIA | Association des Industries de l'Alarme (French: Alarm Industries Association; Belgium) |
| AIA | Adult Image Archive |
| AIA | Asian International Association |
| AIA | Association for Investor Assistance |
| AIA | American Inventors Association |
| AIA | Arrowroot Industry Association |
| AIA | Association of Industrial Advertisers |
| AIA | Aeronautical Industry Association |
| AIA | Assurance Individuelle Accidents (French: Individual Accident Insurance) |
| AIA | Association of Insurance Advertisers |
| AIA | Asnières Industries Adaptées (French disability accommodation group) |
| AIA | Académie Internationale d'Architecture (French: International Academy of Architecture) |
| AIA | Azimuth Indicator Assembly |
| AIA | Activity Interrupt Acknowledgement (ITU-T) |
| AIA | Automation Interoperability Appraisal |
| AIA | Active Interface Adapters |
| AIA | Argon Inlet Assembly (reactor vessel preheating) |
| AIA | Association Internationale des Arganophiles (French: International Association of Arganophiles; tree enthusiast group) |
| AIA | Automatic Incident Actuation |
| AIA | Annual-in-Advance (payment method) |
| AIA | Áreas Importante para Aves (Spanish: Important Bird Areas; bird conservation; various locations) |
| AIA | American Insurance Administrators (various locations) |
| AIA | Asians in America |
| AIA | Anti-Idiotypic Antibody |
| AIA | African Investment Advisory (South Africa and UK) |
| AIA | Animal Interest Alliance (South Africa) |
| AIA | Advance Informed Agreement (Convention on Biological Diversity) |
| AIA | Achieve in Africa, Inc. (Thousand Oaks, CA) |
| AIA | Leahy-Smith America Invents Act of 2011 (patent reform law) |