| AIN | Acute Infectious Nephritis 
| Others |
| AIN | Acute Interstitial Nephritis
| Others |
| AIN | Additive Identification Number for food additives
| Others |
| AIN | Admission Index Number
| Others |
| AIN | Advanced Integrated Network
| Others |
| AIN | Advanced Intelligent Network
| Others |
| AIN | AIDS Interfaith Network
| Others |
| AIN | Alien Identification Numbers
| Others |
| AIN | American Independent Network
| Others |
| AIN | An Idiot Now
| Others |
| AIN | Anal Intraepithelial Neoplasia
| Others |
| AIN | Anal Intraepithelial Neoplasm
| Others |
| AIN | Andean Information Network
| Others |
| AIN | Anterior Interosseous Nerve
| Others |
| AIN | Applied Improvisation Network
| Others |
| AIN | Approved Item Name
| Others |
| AIN | Approved Item Names
| Others |
| AIN | Army Interoperability Network
| Others |
| AIN | Artificial Intelligence Innovation
| Others |
| AIN | Artificial Intelligence News
| Others |
| AIN | Asean Information Network
| Others |
| AIN | Asociacion Internet de Nicaragua
| Others |
| AIN | Assessor's Identification Number
| Others |
| AIN | Assistant In Nursing
| Others |
| AIN | Audio in
| Others |
| AIN | AUGMENTED INDEX denote
| Others |
| AIN | Authorized Integrators Network
| Others |
| AIN | autoimmune neutropenia
| Others |
| AIN | Automatic Insertion Notification
| Others |
| AIN | Automotive Information Network
| Others |
| AIN | Aviation International News
| Others |
| AIN | Ayuda de la Iglesia de Noruega
| Others |
| AIN | Compressed file archive (Ain)
| Others |
| AIN | Wainwright, Alaska USA
| Others |