| Abbreviation | Definition |
|---|---|
| SEFI | European Society for Engineering Education |
| SEFI | Société Européenne pour la Formation des Ingénieurs |
| SEFI | Socit Europenne pour la Formation des Ingnieurs |
| SEG | Society of Economic Geologists |
| SEGD | Society for Experiential Graphic Designers |
| SEHA | Society for Early Historic Archaeology |
| SEHA | Society of Eclectic Halloween Artists |
| SEHA | Society of Electic Halloween Artists |
| SEHS | South End Historical Society |
| SEI | Italian Entomological Socety |
| SEI | Societ Entomologica Italiana |
| SEI | Società Entomologica Italiana |
| SEIN | Société d'Encouragement pour l'Industrie Nationale |
| SEIN | Society for the Encouragement of National Industry |
| SEIN | Socit d'Encouragement pour l'Industrie Nationale |
| SEIO | Sociedad de Estadística e Investigación Operativa |
| SEIO | Sociedad de Estadstica e Investigacin Operativa |
| SEIO | Society of Statistics and Operations Research |
| SEIS | Software Engineering in Society |
| SELL | Finlands Veterinärförbund |