| Abbreviation | Definition |
|---|---|
| ISPJ | Indiana Society of Professional Journalists |
| ISPO | Information Society Project Office |
| ISPRS | International Society of Photogrammetry and Remote Sensing |
| ISQ | Israel Society for Quality |
| ISRO | International Securities Regulatory Organization |
| ISS | Infantile Seizure Society |
| ISS | Iranian Statistical Society |
| ISS | Iron & Steel Society |
| ISSA | Inter Scholastic Sailing Association |
| ISSA | International Sanitary Supply Association |
| ISSA | International Securities Services Association |
| ISSA | International Slurry Surfacing Association |
| ISSA | International Sports Sciences Association |
| ISSA | International Studies Schools Association |
| ISTA | International Safe Transit Association |
| ISTA | International Syclone Typhoon Association |
| ISTAT | International Society of Transport Aircraft Trading |
| ISTC | Institute of Scientific and Technical Communicators |
| ISTD | International Society of Typographic Designers |
| ISTE | Indian Society of Technical Education |