Found 7 full forms for HSTO
| Term | Full Form | Category |
|---|---|---|
| HSTO | Harvard Student Telephone Office 
| Others |
| HSTO | High Speed Transient Offtracking
| Others |
| HSTO | High Standard Tourism Operator
| Others |
| HSTO | Higher Standard Telephone Operators
| Others |
| HSTO | Highway Safety and Traffic Operations
| Others |
| HSTO | Hoger Secundair Technisch Onderwijs
| Others |
| HSTO | Tong, Sudan
| Others |