| Abbreviation | Definition |
|---|---|
| SEBM | Society of Experimental Biology and Medicine |
| SECED | Society for Earthquake and Civil Engineering Dynamics |
| SECEEB | Standards of Ethical Conduct for Employees of the Executive |
| SECWA | Southeastern Car Wash Association |
| SEDA | Saskatchewan Economic Developers Association |
| SEDA | Sitka Economic Development Association |
| SEDA | South East Drift Association |
| SEFTA | South East Furniture Training Association |
| SEJ | Society of Environmental Journalists |
| SEMA | Southeastern Electricity Metering Association |
| SEMA | Specialty Equipment Manufacturer's Association |
| SEMA | Specialty Equipment Marketing Association |
| SEMA | Speed Equipment Manufacturers Association |
| SEMS | Society for Engineering Management Systems |
| SEO | Sociedad Española de Ornitología |
| SEPA | Solar Electric Power Association |
| SEPM | Society of Economic Paleontologists and Mineralogists |
| SEPT | Safety and Emergency Procedures Training |
| SERA | Southeast Endurance Riders Association |
| SERA | Suburban Electric Railway Association |