| Acronym | Definition |
|---|
| HSI➣Humane Society International |
| HSI➣Hang Seng Index |
| HSI➣Homeland Security Investigations (US Immigration and Customs Enforcement) |
| HSI➣High Speed Internet |
| HSI➣Hispanic Serving Institutions |
| HSI➣Health Sciences Institute (Baltimore, MD, USA) |
| HSI➣Horizon Software International (Duluth, GA) |
| HSI➣Horizontal Situation Indicator (aviation) |
| HSI➣Health Systems International (various locations) |
| HSI➣Human Systems Integration |
| HSI➣Homeland Security Intelligence (various organizations) |
| HSI➣H323 Signaling Interface |
| HSI➣H323 Service Interface |
| HSI➣Handmade Software Inc. |
| HSI➣High Speed Interconnect |
| HSI➣Hierarchical Storage Interface |
| HSI➣High Speed Serial Interface |
| HSI➣Hyperspectral Imagery |
| HSI➣Hue Saturation Intensity (color model) |
| HSI➣Human System Integration |
| HSI➣Human Swine Influenza |
| HSI➣High Speed Interface |
| HSI➣High School Institute (various locations) |
| HSI➣Hospitality Solutions International |
| HSI➣Hyperspectral Imager |
| HSI➣Hot Section Inspection |
| HSI➣Hot Surface Igniter |
| HSI➣Home Study International |
| HSI➣Heat Stress Index |
| HSI➣Hardware-Software Integration |
| HSI➣Health Services Inspection (formerly HSMI) |
| HSI➣Home School, Inc. |
| HSI➣Hastings, NE, USA (Airport Code) |
| HSI➣Human Synergistics International (Plymouth, MI) |
| HSI➣Human Systems Interface |
| HSI➣Health Services International |
| HSI➣High Speed Infrared (Film, Kodak) |
| HSI➣Hungarian Standards Institution |
| HSI➣Health Sciences Initiative (San Diego Science Alliance; California) |
| HSI➣Hudson Smith International |
| HSI➣Handling Speed Intelligently (running training club founded by coach John Smith; Los Angeles, CA) |
| HSI➣Home Safety Inspection (Australia) |
| HSI➣Horsepower per Square Inch (physics) |
| HSI➣Hellenic Society of Immunology |
| HSI➣Health Sustainability Initiative (Canada) |
| HSI➣Home Station Instrumentation (Army) |
| HSI➣Horizon Situation Indicator |
| HSI➣High-Speed Interferometer |
| HSI➣Hours Since Inspection |
| HSI➣Handbook of Service Instruction |
| HSI➣Host-Specific Interface |
| HSI➣Habitat Stability Index |
| HSI➣Harsh Squirrel Interaction (training team) |
| HSI➣Heading Select Indicator |