ISAPP
| 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) |