| ISPA | Illinois School Psychologists Association 
| Others |
| ISPA | Image and Signal Processing and Analysis
| Others |
| ISPA | Improvise Scavenge Protect Adapt
| Others |
| ISPA | Improvise Scavenge Protect and Adapt
| Others |
| ISpA | Indian Space Agency
| Organization, Research Center, Transport, Space Travel, Spacecraft |
| ISPA | Institute of Science and Public Affairs
| Others |
| ISPA | Institute of Space and Planetary Astrophysics
| Others |
| ISPA | Instituto Superior de Psicologia Aplicada
| Others |
| ISPA | Intenational Society for the Performing Arts
| Others |
| ISPA | Interagency Social Protection Assessments
| Others |
| ISPA | International School Psychology Association
| Others |
| ISPA | International Search Partners Association
| Others |
| ISPA | International Segway Polo Association
| Others |
| ISPA | International Sleep Products Association
| Others |
| ISPA | International Society for Plant Anaerobiosis
| Others |
| ISPA | International Society for the Performing Arts
| Others |
| ISPA | International Society for the Philosophy of Architecture
| Others |
| ISPA | International Society of Precision Agriculture
| Others |
| ISPA | International Software Process Association
| Others |
| ISPA | International Studies Preparatory Academy
| Others |
| ISPA | International Symposium on the Pediatric Airway
| Others |
| ISPA | Internet Service Provider Austria
| Others |
| ISPA | Internet Service Providers Association
| Others |
| ISPA | Internet Service Providers Austria
| Others |
| ISPA | Iowa School Psychologists Association
| Others |
| ISPA | Iowa State Police Association
| Others |
| ISPA | Iowa Student Personnel Association
| Others |
| ISPA | Iranian Students Polling Agency
| Others |