| Acronym | Definition |
|---|
| IIST | Indian Institute of Space Science and Technology (also seen as IISST) |
| IIST | Indore Institute of Science & Technology (India) |
| IIST | International Institute for Software Testing |
| IIST | International Institute for Software Technology (United Nations) |
| IIST | Institute for International Studies and Training |
| IIST | International Institute of Sports Therapy |
| IIST | Institute for Information Storage Technology |
| IIST | International Institute for Strategic Studies |
| IIST | Institute of Information Sciences and Technology (Massey University) |
| IIST | International Institute of Sports Therapists (UK) |
| IIST | Institute for Information Systems Technology |
| IIST | Indian Institute of Software Testing |
| IIST | International Institute of Soccer Tourism |
| IIST | Institut de l'Information Scientifique et Technique (French) |
| IIST | Institute of Intelligent Systems and Technologies (St.Petersburg State Technical University) |
| IIST | Interprocessor Interrupt and Sanity Timer |
| IIST | Institute of Information Science &Technology (Modinagar,India) |
| IIST | Independent IIMS (Independent Information Management System) Study Team |
| IIST | Intelligent Information Systems Technology |
| IIST | Institution of Instrumentation Scientists and Technologists (India) |
| IIST | Internet/Intranet Strategic Team |
| IIST | Initial Integrated System Test |