| Acronym | Definition |
|---|
| SEF | Search Engine Friendly |
| SEF | Serviço de Estrangeiros e Fronteiras (Portugal; Portuguese Immigration and Border Control Office) |
| SEF | Severely Errored Frame |
| SEF | Sex Education Forum |
| SEF | Swap Execution Facility |
| SEF | Spectral Edge Frequency |
| SEF | Sankara Eye Foundation |
| SEF | Société d'Ethnologie Française (French: French Society of Ethnology) |
| SEF | Somatosensory Evoked Field (aka Somatic Evoked Field) |
| SEF | Social Enterprise Fund (Canada) |
| SEF | Source Explicit Forwarding |
| SEF | Société Entomologique de France (French: French Entomological Society) |
| SEF | Sociedad Española de Fitopatología (Spanish: Spanish Society of Phtyopathology) |
| SEF | Sensitive Earth Fault |
| SEF | Self Extinguishing Fabric (Modacrylic) |
| SEF | Systeme d'Encheres (French: Bridge card game bidding system) |
| SEF | School Evaluation Framework (UK) |
| SEF | Sinfonia Educational Foundation |
| SEF | Short Edge First (printer paper handling) |
| SEF | Système d'Enseignement Français (French: French Education System; book) |
| SEF | Sharp Electronics France |
| SEF | Services Emplois Familiaux (French: Family Services Jobs) |
| SEF | sealift enhancement feature (US DoD) |
| SEF | Sustaining Engineering Facility |
| SEF | Software Enhancement Form |
| SEF | SPECAT Exclusive For |
| SEF | Société Européenne de Formation (French: European Society of Training) |
| SEF | Société d'Equipements de Fonderie (French engineering company) |
| SEF | Secure Enclave Firewall |
| SEF | Section Économique et Financière (French: Economic and Financial Department) |
| SEF | Sign Each Frame |
| SEF | Shape Error Forecasting |
| SEF | Shadow Event Facility (DataDirect) |
| SEF | Social Engine Forum (website) |
| SEF | Scottish Environmental Forum (UK) |
| SEF | Swiss Economic Forum |
| SEF | Software Engineering Facility |
| SEF | Straits Exchange Foundation (China) |
| SEF | Strategic Enterprise Fund (United Parcel Service) |
| SEF | Special Elite Forces (gaming clan) |
| SEF | Symantec Enterprise Firewall |
| SEF | Senior Executive Fellow (Harvard University) |
| SEF | Southern Education Foundation |
| SEF | Sustainable Energy Fund (Pennsylvania) |