| Abbreviation | Definition |
|---|---|
| SSPII | Second Shanghai Sewerage Project |
| SSPO | State Surplus Property Office |
| SSPP | State Surplus Property Program |
| SSPP | Storm Surge Planning Program |
| SSPR | South Suburban Parks and Recreation |
| SSPS | Social Service Payment System |
| SSRP | South Saskatchewan Regional Plan |
| SSRS | Single State Registration System |
| SSTC | State Science and Technology Commission |
| ST | Sales Tax |
| ST | Service Tax |
| ST | State Tender |
| STAAR | State of Texas Assessments of Academic Readiness |
| STAM | Speech and Theatre Association of Missouri |
| STAR | State Testing And Reporting |
| STARS | Shock Trauma Air Rescue Service |
| STARS | State of Texas Assistance and Referral System |
| STD | State Territory District |
| STEP | Southern Tablelands Ecosystem Park |
| STIC | Statewide Terrorism & Intelligence Center |