| Acronym | Definition |
|---|
| ISTS➣International Symposium on Space Technology and Science (Japan) |
| ISTS➣Intel Science Talent Search |
| ISTS➣Institute for Security Technology Studies |
| ISTS➣International Sea Turtle Society |
| ISTS➣Individual Sewage Treatment Systems |
| ISTS➣International Sea Turtle Symposium |
| ISTS➣Institute for Space and Terrestrial Science |
| ISTS➣Inner Structure Subsystem (US NASA) |
| ISTS➣Ion Source Test Stand |
| ISTS➣International Switched Transit Service |
| ISTS➣Integrated Software Training Solutions, Inc. |
| ISTS➣Information Systems Tracking System |