| Abbreviation | Definition |
|---|---|
| ISPD | Institute of School and Parish Development |
| ISPE | Institute for Studies and Power Engineering |
| ISPE | Institute of Swimming Pool Engineers |
| ISPI | International Spine and Pain Institute |
| ISPI | International Summer Physics Institute |
| ISPI | International Summer Postgraduate Institute |
| ISPL | Institute of Space Policy and Law |
| ISPON | Institute of Safety Professionals of Nigeria |
| ISPS | Institute for Strategic Policy Solutions |
| ISR | Institute for Scientific Research |
| ISR | Institute for Scripture Research |
| ISR | Institute for Social Research |
| ISR | Institute for Survey Research |
| ISR | Institute for Systems Research |
| ISRA | Institute of State and Regional Affairs |
| ISRD | Institute for Small and Rural Districts |
| ISRI | Information Society Research Institute |
| ISRI | Information Systems Research Institute |
| ISRI | Institute Of Scrap Recycling Industries |
| ISRIP | International Sedimentation Research Institute Pakistan |