Found 5 full forms for HTOS
| Term | Full Form | Category |
|---|---|---|
| HTOS | Heritage Trees of Scotland 
| Others |
| HTOS | High Tc Oraganic Superconductor
| Others |
| HTOS | Hindu Temple of Siouxland
| Others |
| HTOS | Houston Theatre Organ Society
| Others |
| HTOS | Houston Tinplate Operators Society
| Others |