| Acronym | Definition |
|---|
| HESI➣Health and Environmental Sciences Institute (Washington, DC) |
| HESI➣Health Education Systems, Inc. (software-based testing company) |
| HESI➣High Energy Solar Imager |
| HESI➣Higher Education Support Initiative (Academy for Educational Development and US AID) |
| HESI➣Hemisphere Expo Services, Inc. (est. 1990; Steamboat Springs, CO) |
| HESI➣Health Education Services Inc. (nursing exam) |