| SPPI | Science and Public Policy Institute 
| Others |
| SPPI | Section on Public and Professional Interest
| Others |
| SPPI | Services Producer Price Index
| Others |
| SPPI | Single Project Professional Indemnity
| Others |
| SPPI | Social and Physical Proximity Interactions
| Others |
| SPPI | Solely for Payment of Principal and Interest
| Others |
| SPPI | Solely Payments of Principal and Interest
| Others |
| SPPI | Solely Payments of Principle and Interest
| Others |
| SPPI | Speedway Products Inc.
| Others |
| SPPI | Standards of Professional Practice Institute
| Others |
| SPPI | Structure of Policy Provisioning Information
| Others |
| SPPI | Studyblr Pen Pals International
| Others |
| SPPI | Sustainable Public Procurement Initiative
| Others |