| Abbreviation | Definition |
|---|---|
| SS | State Statute |
| SSA | Singular System Approach |
| SSA | Social Security Administration |
| SSA | Standard Spending Assessment |
| SSA(s) | Secret Service agent(s) |
| SSBN | Submersible Sphip Ballatic Misile |
| SSC | Short Service Commission |
| SSD | Social Security Disability |
| SSDB | Social Security Disability Benefits |
| SSDD | System/Segment Design Description (MIL-STD-498) |
| SSDI | Social Security Death Index |
| SSDI | Social Security Disability Insurance |
| SSED | Summary of Safety and Effectiveness |
| SSG | Staff Sergeant - Army |
| SSG | Standards Services Group |
| SSG | Strategic Studies Group |
| SSgt | Staff Sergeant - Marines - USAF |
| SSI | Social Security Income |
| SSI | Supplemental Security Income |
| SSI | Supplemental Security Income Program |