| Abbreviation | Definition |
|---|---|
| SDFF | South Delta Fish Facilities |
| SDI | State Disability Insurance |
| SDLT | Stamp Duty Land Tax |
| SDO | SHILO, DANIELTOWN, and OAKLAND |
| SDRF | San Diego Renaissance Faire |
| SDSOS | South Dakota Secretary of State |
| SDTC | San Diego Telecom Council |
| SDTC | State Death Tax Credit |
| SEA | Senate Enrolled Act |
| SEA | Shetland Environmental Agency |
| SEA | State Economic Area |
| SEAP | State Employees Assistance Program |
| SEBA | Safety Employees Benefit Association (San Bernardino County) |
| SEBA | South End Business Alliance |
| SEC | State Electricity Commission |
| SECC | State Employee Charitable Campaign |
| SECP | Supervised Electronic Confinement Program |
| SEDA | Shoals Economic Development Authority |
| SEDC | State Economic Development Corporation |
| SEDDAS | State Education Department Delegated Account System |