| Abbreviation | Definition |
|---|---|
| SGR | sustainable growth rate |
| SGRF | sustainable growth rate formula |
| SGT | Sergeant - Army |
| Sgt | Sergeant - USMC |
| SgtMaj | Sergeant Major - Marines |
| SgtMajMC | Sergeant Major of the Marine Corps |
| SGZ | Springs and Grass Zone |
| SH | SENATE HART Office Building |
| SHAM | Socialists, Humanists, And Marxists |
| SHAPE | Supreme Holiday At Public Expense |
| SHARP | Safety Health Achievement Recognition Program |
| SHC | Sexual Harassment Complaint |
| SHIT | Special High- Intensity Training |
| SHRA | Social Housing Reform Act |
| SI | Secure Investment |
| SI | Smithsonian Institute |
| SI | Special Inquiry |
| SI | Supplemental Instruction |
| SIAC | Special Immigration Appeals commission |
| SIAD | Statistical Information Analysis Division (DOD) |