| 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) |