| ISPI | International Society for Performance Improvement 
| Others |
| ISPI | International Society for Pest Information
| Others |
| ISPI | International Society of Performance Improvement
| Others |
| ISPI | International Spine and Pain Institute
| Others |
| ISPI | International Strategy and Policy Institue
| Others |
| ISPI | International Summer Physics Institute
| Others |
| ISPI | International Summer Postgraduate Institute
| Others |