| Acronym | Definition |
|---|
| ISTT➣International Society for Trenchless Technology |
| ISTT➣International School of Tanning Technology (South Africa) |
| ISTT➣International Society for Transgenic Technologies |
| ISTT➣Isfahan Science and Technology Town (Iran) |
| ISTT➣Improved Surface Towed Target |
| ISTT➣Israeli Tick Typhus Rickettsiae (epidemiology) |