| Abbreviation | Definition |
|---|---|
| ISBF | Iowa School Boards Foundation |
| ISBI | International Society for Burn Injuries |
| ISBP&PNI | Internatonal Society for Brachial Plexus and Peripheral Nerve Injury |
| ISBR | Illinois Saint Bernard Rescue |
| ISBT | International Society for Biological Therapy |
| ISBT | International Society of Beverage Technologists |
| ISBT | International Society of Blood Transfusion |
| ISC | International Service Corps |
| ISCA | International Speech Communication Association |
| ISCM | International Society For Contemporary Music |
| ISCR | Institute for the Study of Competition and Regulation |
| ISCS | Israel Stem Cell Society |
| ISCU | International Society of Cardiovascular Ultrasound |
| ISDA | Italian Sons and Daughters of America |
| ISDL | International Society of Divine Love |
| ISDN | International Society for Developmental Neuroscience |
| ISDP | Income Survey Development Program |
| ISDP | Institute for Security & Development Policy |
| ISDP | International Society for Developmental Psychobiology |
| ISEA | International Society for Exposure Analysis |