| Abbreviation | Definition |
|---|---|
| AIFR | Acute Invasive Fungal Rhinosinusitis |
| AIFR | Age Invariant Face Recognition |
| AIFR | All Injury Frequency Rate |
| AIFR | Alverno Inferno Free Radio |
| AIFR | Annual Individual Fatality Risk |
| AIFS | Arbitration inter frame spacing |
| AIFV | Advanced Infantry Fighting Vehicle |
| AIFV | Armored Infantry Fighting Vehicle |
| AIFV | Armoured Infantry Fighting Vehicle |
| AIFV | Infantry fighting vehicle |
| AIG | American International Group |
| AIG | Academically and Intellectually Gifted |
| AIG | Academically or Intellectually Gifted |
| AIG | Active Implement Guidance |
| AIG | Add Inverse Global |
| AIG | Address Indicator Group |
| AIG | Adventures in Greed |
| AIG | Alhaji Inusa Ganye |
| AIG | Almost In Greece |
| AIG | American Innocence and Greed |