| HAI | haemagglutination inhibition 
| Others |
| HAI | haemagglutinin-inhibiting antibodies
| Others |
| HAI | Haida
| Others |
| HAI | HAL America Inc
| Others |
| HAI | Hardware Accelerator Interface
| Others |
| HAI | Harvard AIDS Initiative
| Others |
| HAI | Hauling Anything Inc
| Others |
| HAI | Hauling Anything Incorporated
| Others |
| HAI | Healing Arts Initiative
| Others |
| HAI | Health Action International
| Others |
| HAI | Healthcare Associated Infection
| Others |
| HAI | Healthcare Associated Infections
| Others |
| HAI | Healthcare-Associated Infection
| Others |
| HAI | Heated Air Intake
| Others |
| HAI | Helicopter Association International
| Others |
| HAI | Help Association Inc
| Others |
| HAI | Hepatic Activity Index
| Others |
| HAI | Hepatic Arterial Infusion
| Others |
| HAI | High Amp Arc Ignition
| Others |
| HAI | Histology Activity Index (Knodell Score)
| Others |
| HAI | Historically Advantaged Institution
| Others |
| HAI | Home Automation Inc
| Others |
| HAI | Home Automation, Inc.
| Others |
| HAI | Honda Automotive Indonesia
| Others |
| HAI | Horizontal Advance Increment
| Others |
| HAI | Hospital Acquired Infection
| Others |
| HAI | Hospital Acquired Infections
| Others |
| HAI | Hospital-Acquired Infection
| Others |
| HAI | Host Adapter Interface
| Others |
| HAI | Hot Air Injection
| Others |
| HAI | Hot Air Intake
| Others |
| HAI | Hotel Adelaide International
| Others |
| HAI | Hover Automotive India
| Others |
| HAI | Human Amyloid Imaging
| Others |
| HAI | Human Awareness Institute
| Others |