| Acronym | Definition |
|---|
| ISPP➣International Society of Political Psychology |
| ISPP➣International Sewage Pollution Prevention Certificate (shipping; various locations) |
| ISPP➣International Society for Plant Pathology |
| ISPP➣International School of Phnom Penh (Cambodia) |
| ISPP➣Information Support Pro Bono Platform |
| ISPP➣Illinois School of Professional Psychology |
| ISPP➣Illinois State Physics Project |
| ISPP➣Integrated Sponsor's Program Proposal |
| ISPP➣Individualized Sleep Promotion Plan |
| ISPP➣Information Security Placement Professional |
| ISPP➣Information System Program Plan |
| ISPP➣Israel Society of Physiology & Pharmacology |