| Abbreviation | Definition |
|---|---|
| ISTAR | Information Society Training and Awareness Raising |
| ISTD | Indian Society for Training and Development |
| ISTD | Indian Society for Training Development |
| ISTD | International Society for Trainers and Developers |
| ISTE | Indian Society for Technical Education |
| ISTE | Indian Society For Technical Educations |
| ISTE | Indian Society of Technical Engineers |
| ISTE | International Society for |
| ISTE | International Society for Teacher Education |
| ISTF | International Society of Tropical Foresters |
| ISTH | International Society on Thrombosis and Haemostasis |
| ISTS | International Sea Turtle Society |
| ISTS | International Society for Twin |
| ISTS | International Society for Twin Studies |
| ISTSS | International Society for Traumatic Stress Studies |
| ISUP | International Society of Urological Pathology |
| ISUS | IA Software User Society |
| ISUS | International Society for Utilitarian Studies |
| ISV | International Society for Vaccines |
| ISV | International Society of Vaccines |