HTSI
| Acronym | Definition |
|---|---|
| HTSI | Host Transport Service Interface |
| HTSI | Herzog Transit Services, Inc. (St Joseph, MO) |
| HTSI | Honeywell Technology Solutions Incorporated |
| HTSI | Helicopter Transport Services Inc. (Baltimore, MD) |
| HTSI | Hidden Technology Systems International Ltd. (Rainham, London, England, UK) |
| HTSI | Human Thyroid-Stimulating Immunoglobulin |
| HTSI | Hayden Tower Service, Inc. (est. 1979; Topeka, KS) |
| HTSI | Hi-Tech Solutions, Inc. (Washington, DC) |