HHSI
| 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 |