| Abbreviation | Definition |
|---|---|
| HSRI | Health Sciences Research Institute |
| HSRI | Health Systems Research Institute |
| HSRI | Human Services Research Institute |
| HSRI | Human Services Response Institute |
| HSSEDI | Homeland Security Systems Engineering Development Institute |
| HSSI | Health Sciences Scholar Institute |
| HSSI | Horticultural Science Summer Institute |
| HTEI | High Training Educational Institute |
| HTEI | Hyundai Technical Education Institute |
| HTI | Hawai i Technology Institute |
| HTI | High Tech Institute |
| HTI | History Teaching Institute |
| HTI | Horticultural Therapy Institute |
| HTI | Hypnotherapy Training Institute |
| HTIA | Hypnotism Training Institute of Alberta |
| HTLI | High Tech Law Institute |
| HTRI | Heat Transfer Research Institute |
| HURI | Highlander Undergraduate Research Institute |
| HVPI | Hudson Valley Psychodrama Institute |
| HWI | Health Wellness Institute |