| Acronym | Definition |
|---|
| IAN | i am nothing |
| IAN | Interim Advice Note (various locations) |
| IAN | Inferior Alveolar Nerve |
| IAN | Instantni Astronomicke Noviny (Czech: Instant Astronomical Newspaper) |
| IAN | Independent Author Network (community) |
| IAN | Imperial Andermani Navy (Honor Harrington science fiction novels) |
| IAN | Interactive Autism Network (online project) |
| IAN | Interactive Affiliate Network |
| IAN | Instrumentation & Automation News |
| IAN | Internet Area Network |
| IAN | International Agency Network (overseas property) |
| IAN | Ianuarius (Latin: January) |
| IAN | Incident Area Network |
| IAN | Intelligent Access Network (ADC) |
| IAN | Issuer Alternative Name |
| IAN | International Accounting Network |
| IAN | Instituto Agronomico Nacional (Paraguay) |
| IAN | Indicated Admission Number (UK schools) |
| IAN | Interest Arrears Note |
| IAN | Instituto Argentino de Navegación |
| IAN | Installation After Next |