| Acronym | Definition |
|---|
| HAI | Healthcare-Associated Infections |
| HAI | Helicopter Association International |
| HAI | Healing Arts Institute (Fort Collins, CO) |
| HAI | Home Automation, Inc. (New Orleans, LA) |
| HAI | Hospital Acquired Infection |
| HAI | Health Action International |
| HAI | Human-Animal Interaction |
| HAI | Hardware Accelerator Interface |
| HAI | Host Adapter Interface |
| HAI | Hemagglutination Inhibition (Immune assay type, microbiology) |
| HAI | Hepatic Arterial Infusion (therapy) |
| HAI | Human Awareness Institute |
| HAI | Health Alliance International (University of Washington) |
| HAI | HelpAge International (UK) |
| HAI | Hellenic Aerospace Industry |
| HAI | Healthcare-Acquired Infection |
| HAI | Human Appeal International |
| HAI | Hotel Association of India |
| HAI | High-Current Arc Ignition |
| HAI | Higgenbotham Auctioneers International (Lakeland, FL) |
| HAI | Hamamatsu Agency for Innovation (Shizuoka, Japan) |
| HAI | Hepatic Activity Index |
| HAI | Hockey Art International |
| HAI | Handbook of Artificial Intelligence |
| HAI | High Altitude Indoctrination |
| HAI | High-Level Analog Input |
| HAI | Higher Authority of Intelligence |