| Abbreviation | Definition |
|---|---|
| ISFC | International Society and Federation of Cardiology |
| ISFC | International Society for Fungal Conservation |
| ISFHWE | International Society of Family History Writers Editors |
| ISFP | International Society for Fall Protection |
| ISFP | International Society for Fertility Preservation |
| ISFP | International Society For Philosophers |
| ISFR | International Society for Fracture Repair |
| ISFT | International Society for Telemedicine |
| ISGB | Interenational Society of Glass Beadmakers |
| ISGE | International Society for Gynaecological Endocrinology |
| ISGE | International Society for Gynecologic Endoscopy |
| ISGE | International society of Gynecological Endocrinology |
| ISGG | International Society of Grid Generation |
| ISGP | Illinois Society of Genetic Professionals |
| ISGP | Islamic Society of Greater Portland |
| ISGS | Illinois State Genealogical Society |
| ISGS | International Society for General Semantics |
| ISGS | International Society for Gesture Studies |
| ISGS | International Sol Gel Society |
| ISH | International Society for Hypnosis |