| Acronym | Definition |
|---|
| HHSI➣Heritage Health Systems, Inc. |
| HHSI➣High-Head Safety Injection |
| HHSI➣Historical Harp Society of Ireland (Carrick-on-Suir, Ireland) |
| HHSI➣Horizontal/Hover Situation Indicator (CH-46E instrument panel) |
| HHSI➣Health and Human Services Informatics |