| Rank | Abbreviation | Meaning |
|---|
| ***** | ISTF | Installed System(s) Test Facility
| |
| **** | ISTF | international soft tennis federation
| |
| **** | ISTF | Ion Source Test Facility
| |
| **** | ISTF | Interface Simulation and Testing Framework
| |
| *** | ISTF | Integrated Systems Task Force
| |
| *** | ISTF | Internet Societal Task Force
| |
| *** | ISTF | International Society of Tropical Foresters
| |
| *** | ISTF | Illumination System Transfer Function
| |
| *** | ISTF | International Spring Trade Fair
| |
| ** | ISTF | Integrated Servicing and Test Facility
| |
| ** | ISTF | Integrated Systems Test Facility
| |
| ** | ISTF | Internet Security Task Force
| |
| * | ISTF | Installed System Test Facilities
| |
| * | ISTF | Information Society Technologies Foundation
| |
| * | ISTF | Integrated System Test Flow
| |
| * | ISTF | International Sepak Takraw Federation
| |
| * | ISTF | Internet Security Technology Forum
| |
| * | ISTF | Internet Services Telecom Fiji
| |
| * | ISTF | Industrial Science and Technology Frontier
| |
| * | ISTF | Internet Science and Technology Fair
| |
| * | ISTF | International Safe Travels Foundation
| |
| * | ISTF | International Society of Tropical Forestry
| |
| * | ISTF | Illinois State Tax Forms
| |
| * | ISTF | Interim Storage and Treatment Facility
| |
| * | ISTF | Invasive Species Task Force
| |