| Acronym | Definition |
|---|
| HISI➣Hospital Infection Society India (New Delhi, India) |
| HISI➣Healthcare Informatics Society of Ireland (Cumann Ríomheolais Sláinte) |
| HISI➣Heat Illness Symptom Index |
| HISI➣Honeywell Information Systems Italia (Milan, Italy) |
| HISI➣Hotel Inventories Specialists, Inc |
| HISI➣Hotel Interactive Systems, Incorporated (pay-TV provider, Philippines) |