| AIU | Abort Interface Unit 
| Others |
| AIU | Acceptance Include and Understand
| Others |
| AIU | Access Interface Unit
| Others |
| AIU | Accident Investigation Unit
| Others |
| AIU | ADN (Automatic Digital Network) Interface Unit
| Others |
| AIU | Adopt, Implement or Upgrade
| Others |
| AIU | Adoption Implementation Upgrade
| Others |
| AIU | Adrenal Insufficiency United
| Others |
| AIU | Advanced Interface Unit
| Others |
| AIU | Advice Information Updates
| Others |
| AIU | Aircraft Interface Unit
| Others |
| AIU | Akita International University
| Others |
| AIU | Alarm Interface Unit
| Others |
| AIU | Allegheny Intermediate Unit
| Others |
| AIU | Alliance International University
| Others |
| AIU | Amalgamated Insurance Underwriters
| Others |
| AIU | American InterContinental University
| Others |
| AIU | American Intercontinental University's
| Others |
| AIU | American International Underwriters
| Others |
| AIU | American International Urinalysis
| Others |
| AIU | Analog Interface Unit
| Others |
| AIU | Analytic Interventions Unit
| Others |
| AIU | Annual Institutional Update
| Others |
| AIU | Applicant Investigation Unit
| Others |
| AIU | Application Interface Unit
| Others |
| AIU | Aran Insurance Underwriters
| Others |
| AIU | Artificial Intelligence Unit
| Others |
| AIU | As I Understand
| Others |
| AIU | Association of Engineers of Uruguay
| Others |
| AIU | Association of Indian Ultras
| Others |
| AIU | Association of Indian Universities
| Others |
| AIU | Association of Internet Users
| Others |
| AIU | Athletics Integrity Unit
| Others |
| AIU | Atiu Island Airport
| Others |
| AIU | Atiu Island, South Pacific, Cook Island
| Others |
| AIU | Atlantic International University
| Others |
| AIU | Audio Interface Unit
| Others |
| AIU | Audit Inspection Unit
| Others |
| AIU | Automotive Industry Union
| Others |
| AIU | Automotive Intelligence Unit
| Others |
| AIU | Auxiliary Input Unit
| Others |
| AIU | Avionics Interface Unit
| Others |