| Acronym | Definition |
|---|
| ISAPP➣International Scientific Association for Probiotics and Prebiotics (Davis, CA) |
| ISAPP➣International Society for Adolescent Psychiatry and Psychology (est. 1984) |
| ISAPP➣International School on AstroParticle Physics |
| ISAPP➣Integrated System Approach Petroleum Production (Netherlands) |
| ISAPP➣Injury Surveillance and Prevention Program (Alaska Department of Health and Social Services) |