| ISBI | Illinois State Board of Investment 
| Others |
| ISBI | Independent Schools of the British Isles
| Others |
| ISBI | Independent Special Boarding And International
| Others |
| ISBI | International Savings Banks Institute
| Others |
| ISBI | International Society for Biomedical Imaging
| Others |
| ISBI | International Society for Burn Injuries
| Others |
| ISBI | International Society for Burn Injury
| Others |
| ISBI | International Sugar Beet Institute
| Others |
| ISBI | International Symposium on Biomedical Imaging
| Others |