IAA
IAA may refer to:
Science and medicine
Terminology
- Indole-3-acetic acid, a plant hormone
- Aux/IAA repressors, a class of early auxin responsive transcription factors in plants
- Inflammatory aortic aneurysm, a medical condition
- Insulin autoantibody, used in diagnosing Latent autoimmune diabetes
- Interrupted aortic arch, a medical condition
- Iodoacetamide, an alkylating agent
- Isoamyl alcohol, a common name for 3-Methylbutan-1-ol
Institutions & associations
- Academia Sinica Institute of Astronomy and Astrophysics, a research institute in Taiwan
- Instituto Antártico Argentino, Argentine Antarctic Institute: federal agency for Antarctic research
- Instituto de Arqueología Amazónica, archeological research institute in Peru
- Instituto de Astrofísica de Andalucía (IAA-CSIC), research institute in Spain
- International Academy of Architecture, Bulgarian NGO & NPO
- International Academy of Astronautics, Swedish NGO
- International Actuarial Association, worldwide association of actuarial associations
- International Astrostatistics Association
- Israel Antiquities Authority, Israeli governmental authority
- Israeli Astronomical Association
Aviation
- Igarka Airport IATA code
- Indianapolis Airport Authority
- Iran Aseman Airlines, an Iranian airline
- Irish Aviation Authority
- Israel Airports Authority
- International Academy of Astronautics
Automobile
- International Motor Show Germany, known natively as Internationale Automobil-Ausstellung
Computing
- Interactive Achievement Awards, now known as D.I.C.E. Awards
Education
- Idyllwild Arts Academy, a private high school in Idyllwild, California
- Intercollegiate Athletic Association, former name of the National Collegiate Athletic Association
- Interlochen Arts Academy, a boarding school at the Interlochen Center for the Arts
- Inter-American Academy of Guayaquil, an international school in Ecuador
Politics
- Information Affairs Authority of Bahrain
Sports
- Illinois Agricultural Association
- Immigration Appellate Authority (UK)
- Independent Ambulance Association representing private ambulance services in the UK
- Indian Association of Alberta
- Institute for Applied Autonomy
- International Advertising Association, international marketing industry association
- International Association of Art
- Investment Adviser Association
Other uses
- Id al Adha, Muslim holiday
- Intelligence Authorization Act (1991 - U.S.)
- Islamic Army of Aden, militant group designated as a terrorist organization by Bahrain, Canada and the UK
- International Affairs Agency, parody of the Central Intelligence Agency in Grand Theft Auto V