| Acronym | Meaning |
 | PWBA | Pension And Welfare Benefits Administration (replaced By EBSA) |
| RA | Reserve Affairs |
| RBS | Rural Business-Cooperative Service |
| RD | Rural Development |
| RECD | Rural Economic & Community Development (replaced By RD) |
| REE | Research |
| REIS | Regional Economic Information System |
| RHS | Rural Housing Service |
| RICHS | Rural Information Center Health Service |
| RMA | Risk Management Agency |
| ROTC | Reserve Officer Training Corps |
| RRB | Railroad Retirement Board |
| RSA | Rehabilitation Services Administration |
| RSPA | Research And Special Programs Administration |
| RUS | Rural Utilities Service |
| SAMHSA | Substance Abuse And Mental Health Services Administration |
| SAVE | Systematic Alien Verification For Entitlement |
| SBA | Small Business Administration |
| SDFS | Safe And Drug-Free Schools |
| SDWIS | Safe Drinking Water Information System |
| SEC | Securities And Exchange Commission; Space Environment Center |
| SEDAC | Socioeconomic Data And Applications Center |
| SEER | Surveillance |
| SERC | Smithsonian Environmental Research Center |
| SGLI | Servicemembers' Group Life Insurance |
| SI | Smithsonian Institute |
| SIC | Standard Industrial Classification |
| SIES | Office Of Strategic Industries & Economic Security |
| SITES | Smithsonian Institution Traveling Exhibition Service |
| SJI | State Justice Institute |
| SLAC | Stanford Linear Accelerator Center |
| SLSDC | Saint Lawrence Seaway Development Corporation |
| SNL | Sandia National Laboratories |
| SRS | Savannah River Site |
| SS | Secret Service |
| SSA | Social Security Administration |
| SSI | Supplemental Security Income Program |
| SSS | Selective Service System |
| START | Strategic Arms Reduction Talks |
| STAT. | United States Statutes At Large |
| STB | Surface Transportation Board |
| STI | Scientific And Technical Information |
| SUDOC | Superintendent Of Documents |
| TA | Technology Administration |
| TAA | Trade Adjustment Assistance |
| TANF | Temporary Assistance For Needy Families |
| TASC | Transportation Administrative Service Center |
| TDA | Trade And Development Agency |
| TEOAF | Treasury Executive Office For Asset Forfeiture |
| TFF | Treasury Forfeiture Fund |
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