| Abbreviation | Definition |
|---|---|
| HMRI | Houston Methodist Research Institute |
| HMRI | Hunter Medical Research Institute |
| HMRI | Huntington Medical Research Institutes |
| HMSI | Harold M Schulweis Institute |
| HOIA | Hermann Ohlthaver Institute for Aeronomy |
| HOMI | Humans of My Institution |
| HPAI | Health and Physical Activity Institute |
| HPI | Hasso Plattner Institute |
| HPI | Health Performance Institute |
| HPI | Health Policy Institute |
| HPI | Human Performance Institute |
| HRCI | Human Resources Certification Institute |
| HREI | Human Rights Education Institute |
| HRI | Harte Research Institute |
| HRI | Health Related Institutions |
| HRI | Health Research Institute |
| HRI | Hellenic Resources Institute |
| HRI | Homeopathy Research Institute |
| HRI | Horticultural Research Institute |
| HRIA | Human Resources Institute of Alberta |