| Acronym | Definition |
|---|
| GEI | Gases de Efecto Invernadero |
| GEI | Group Emotional Intelligence |
| GEI | Gender Equity Index |
| GEI | Gene-Environment Interaction |
| GEI | General Education Intervention |
| GEI | Gigabit Ethernet Interface (router) |
| GEI | Global Environmental Institute (China) |
| GEI | Grup Especial d'Intervenció (Spanish: Special Forces of the Catalan Police) |
| GEI | Gesellschaft für Elektronische Informationsverarbeitung |
| GEI | Global Effects Integration (US DoD) |
| GEI | Genetically Engineered Ingredients |
| GEI | Geographic Enforcement Initiative |
| GEI | Geocentric Equatorial Inertial Coordinate System |
| GEI | Gross Emitter Identification |
| GEI | Ground Environmental Instrumentation |
| GEI | Government Electrical Inspectorate (Jamaica) |
| GEI | Gene, Environment and Health Initiative |
| GEI | Geothermal Energy Institute |