| Abbreviation | Definition |
|---|---|
| SEC | ShinRa ElectricPower Company |
| SEC | Southern Electric Contracting |
| SECC | Scottish Exhibition And Conference Centre |
| SECI | Solar Energy Corporation of India |
| SECL | Samsung Engineering Co Ltd |
| SECL | South Eastern Coalfields Ltd |
| SECSI | Schroeder Environmental Cleaning Services Inc |
| SED | Svetlana Electronic Devices |
| SEDC | Saginaw Economic Development Corporation |
| SEDC | Saratoga Economic Development Corporation |
| SEDC | Sarawak Economic Development Corporation |
| SEDC | Seguin Economic Development Corporation |
| SEDC | Shelton Economic Development Corporation |
| SEDC | Siouxland Economic Development Corporation |
| SEDC | Southeastern Economic Development Corporation |
| SEDC | Spearfish Economic Development Corporation |
| SEDC | Strafford Economic Development Corporation |
| SEDCO | Saudi Economic and Development Company |
| SEDCO | Southeastern Drilling Company |
| SEDG | Solaredge Technologies Inc |