| ISPE | Idaho Society of Professional Engineers 
| Others |
| ISPE | Illinois Society of Professional Engineers
| Others |
| ISPE | Independent Study Physical Education
| Others |
| ISPE | Independent Surf Physical Education
| Others |
| ISPE | Indiana Society of Professional Engineers
| Others |
| ISPE | Instant Support Professional Edition
| Others |
| ISPE | Institute for Studies and Power Engineering
| Others |
| ISPE | Institute of Swimming Pool Engineers
| Others |
| ISPE | International Society for Pharmaceutical Engineering
| Others |
| ISPE | International Society for PharmacoEpidemiology
| Others |
| ISPE | International Society for Philosophical Enquiry
| Others |
| ISPE | International Society for Productivity Enhancement
| Others |