ISTT
| 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) |