| Acronym | Definition |
|---|
| AIU➣American Intercontinental University |
| AIU➣Akita International University (Japan) |
| AIU➣Allegheny Intermediate Unit (Homestead, PA) |
| AIU➣Audio Interface Unit |
| AIU➣Association of Indian Universities |
| AIU➣Atlantic International University |
| AIU➣Adult Inpatient Unit (various locations) |
| AIU➣American International Underwriters (trade association) |
| AIU➣Associates in Urology (various locations) |
| AIU➣Alliance Israélite Universelle (French: Universal Israelite Alliance) |
| AIU➣Alliant International University |
| AIU➣Association Internationale des Universités |
| AIU➣American International University (Virginia) |
| AIU➣Ambulatory Infusion Unit (University of Missouri Health Care; Columbia, MO) |
| AIU➣Audit Inspection Unit (UK) |
| AIU➣Absolute Iodine Uptake (thyroid) |
| AIU➣Accident Investigation Unit |
| AIU➣Agricultor-Importador-Usuario (Spanish: Agriculture Import Use; Peru) |
| AIU➣Analog Interface Unit |
| AIU➣Association Internationale des Urbanistes (French: International Association of Urban Planners) |
| AIU➣Astrophysical Institute & University Observatory |
| AIU➣American Idol Underground (online community) |
| AIU➣Alarm Interface Unit |
| AIU➣Administración Imprevistos y Utilidad (Spanish) |
| AIU➣Aircraft Interface Unit |
| AIU➣Antenna Interface Unit |
| AIU➣Avionics Interface Unit |
| AIU➣Advanced Interface Unit |
| AIU➣American Insurance Union |
| AIU➣Access Interface Unit |
| AIU➣Armament Interface Unit |
| AIU➣All I Understand |
| AIU➣Automatic Digital Network Interface Unit (US DoD) |
| AIU➣Airborne Instrumentation Unit |
| AIU➣AFSPC IDHS Upgrade |
| AIU➣Authentic Independent Union (Puerto Rico) |
| AIU➣AFTAC Interface Unit |
| AIU➣Article In Use |
| AIU➣Arab Information Union |
| AIU➣Account Intelligence Unit (Citibank) |
| AIU➣AOCMS Interface Unit |