| H&I | Harassing and Interdicting 
| Others |
| HI | Hackers Incorporated
| Others |
| HI | Haematological Immune
| Others |
| HI | Hand In
| Others |
| HI | Handicap Index
| Others |
| HI | Hanging In
| Others |
| HI | Hanging Indent
| Others |
| HI | Happiness Index
| Others |
| HI | Harassment Ideas
| Others |
| HI | Harmful Input
| Others |
| HI | Harvest Institute
| Others |
| HI | Haskell Institute
| Others |
| HI | Hawaii
| State |
| HI | Hayes International
| Others |
| HI | Hazard Index
| Others |
| HI | Head In
| Others |
| HI | Head Injuries
| Others |
| HI | Head Injury
| Others |
| HI | Health Improvement
| Others |
| HI | Health Index
| Others |
| HI | Health Information
| Others |
| HI | Health Insurance
| Others |
| HI | Healthy IDEAS
| Others |
| HI | Hearing Impaired
| Others |
| HI | Hearing Impairment
| Others |
| HI | Heat Index
| Others |
| HI | Heat Intercept
| Others |
| HI | Heavenly and Intimate
| Others |
| HI | Heavy Ion
| Others |
| HI | Height of Instrument
| Others |
| HI | Hello I
| Others |
| HI | Hello In
| Others |
| HI | Hello Internet
| Others |
| HI | Help and Information
| Others |
| HI | Hemagglutination Inhibition
| Others |
| HI | Herding Intermediate
| Others |
| HI | Here Is ....
| Others |
| HI | Herfindahl Index
| Others |
| HI | HI Interactivity
| Others |
| HI | HI is
| Others |
| HI | High Impact
| Others |
| HI | High Intensity
| Others |
| HI | High Intermediate
| Others |
| HI | High Investigators
| Others |
| HI | High Island
| Others |
| HI | High Isolation
| Others |
| HI | High scores (games)
| Others |
| HI | Higher Intelligence
| Others |
| HI | Higherlife International
| Others |
| HI | Hindi
| Others |
| HI | Hockey India
| Others |
| HI | Holiday Inn
| Others |
| HI | Holton Interurban Railway
| Others |
| HI | Home Improvement
| Others |
| HI | Home Inspector
| Others |
| HI | Homemaker Interactive
| Others |
| HI | Homo Iconos
| Others |
| HI | Honesty and Integrity
| Others |
| HI | Honeywell Inc
| Others |
| HI | Honeywell, Inc.
| Others |
| HI | Hospital Insurance
| Others |
| HI | Hospitality Industry
| Others |
| HI | Host Interface
| Others |
| HI | Hostelling International
| Others |
| HI | Hot Iron
| Others |
| HI | Hotel Infulenza
| Others |
| HI | Hotspot Implementation
| Others |
| HI | Human Improvement
| Others |
| HI | Human Intelligence
| Others |
| HI | Human Interface
| Others |
| HI | Humanistic Intelligence
| Others |
| HI | Humor Impaired
| Others |
| HI | Humorous Individual
| Others |
| HI | Humorous Intention
| Others |
| HI | Hydrogen Iodide (Hydriodic Acid)
| Others |
| HI | Hydrogen Iodine
| Others |
| HI | Hyperactive Impulsive
| Others |
| HI | Hypnogogic Imagery
| Others |
| HI | Hypoxia Ischemia
| Others |