| Acronym | Definition |
|---|
| SEG | Segment |
| SEG | Second Generation (gaming clan) |
| SEG | Saturday Evening Girls (pottery) |
| SEG | Society of Exploration Geophysicists |
| SEG | Shanghai Electric Group (China) |
| SEG | Searl Effect Generator (energy) |
| SEG | Security Gateway (software) |
| SEG | Special Effects Generator |
| SEG | Scheduler Event Generator |
| SEG | Silicone Edge Graphic (fabric) |
| SEG | Select Employer Group (various organizations) |
| SEG | Society of Economic Geologists |
| SEG | Similiar Exposure Group (chemical exposure) |
| SEG | Samsung Electronics GmbH |
| SEG | Software Equity Group |
| SEG | South East Group (various locations) |
| SEG | Select Employee Group |
| SEG | Software Engineering Group |
| SEG | Socio-Economic group |
| SEG | Selective Epitaxial Growth |
| SEG | State Education Grant (Pennsylvania) |
| SEG | Scientific Ecology Group |
| SEG | Sciences Economiques et Gestion (French: Economic and Management Sciences) |
| SEG | Special Escort Group (UK) |
| SEG | Search Engine Group |
| SEG | Societe Europeenne de Gynecologie (French: European Society of Gynecology) |
| SEG | Segway Enthusiasts Group |
| SEG | Screen Extras' Guild |
| SEG | Society of Exploration Geologists |
| SEG | Survey & Engineering GIS (Geographic Information System; conference) |
| SEG | Southern Electric Group |
| SEG | Shanghai Environment Group (China) |
| SEG | System-EDV und Organisations GmbH (German automotive services) |
| SEG | Silent Echo Gaming (gaming clan) |
| SEG | Spark Erosion Grinding |
| SEG | Scientific Evaluation Group |
| SEG | Simulation Exercise Group |
| SEG | Siberian Energy Group (New York, NY) |
| SEG | Service des Enseignements Généraux (French: General Service Lessons) |
| SEG | Systems Evaluation Group |
| SEG | Sveriges Elgrossister (Swedish Electrical Wholesalers Federation) |
| SEG | Satellite Engineering Group, Inc |
| SEG | Southern Examination Group (UK) |
| SEG | Science Engineering Group |
| SEG | Social Entrepreneurs Group |
| SEG | Standardization Evaluation Group |
| SEG | Social Enterprise Group, LLC |
| SEG | Stuff Eating Grin (polite form) |
| SEG | System Effectiveness Group |
| SEG | Situational Event Generator |
| SEG | Sequence Enforcing Gate |
| SEG | Spa Esprit Group (est. 1996; Singapore) |