| Acronym | Definition |
|---|
| GEO | George |
| GEO | Group on Earth Observations (est. 2002) |
| GEO | Geography |
| GEO | Geographic |
| GEO | Global Environment Outlook |
| GEO | Georgia (ISO Country code) |
| GEO | Gene Expression Omnibus (National Center for Biotechnology Information's archive and resource for gene expression data) |
| GEO | Government Equalities Office (UK) |
| GEO | Geosynchronous |
| GEO | Geostationary Orbit |
| GEO | Global Education Office (various universities) |
| GEO | Group Executive Office (Tata) |
| GEO | Geosynchronous Earth Orbit |
| GEO | Green Energy Ohio |
| GEO | Gold Equivalent Ounce (mining product marketing) |
| GEO | Global Earth Oceans (Fifth World Community) |
| GEO | Grantmakers for Effective Organizations |
| GEO | Geostationary Equatorial Orbit |
| GEO | Geospatial Enterprise Office (Oregon) |
| GEO | Geothermal Education Office (Tiburon, CA) |
| GEO | Geotechnical Engineering Office (Hong Kong) |
| GEO | Global Equity Opportunities (Goldman Sachs) |
| GEO | Grupo Especial de Operaciones (Spain: Police Special Operations Group) |
| GEO | General Education Outcome |
| GEO | Graduate Employee Organization |
| GEO | Global Equity Offerings |
| GEO | Guam Energy Office |
| GEO | Gas Engine Oil |
| GEO | Graduate English Organization (various schools) |
| GEO | Green Earth Organization |
| GEO | Georgetown, Guyana - Timehri (Airport Code) |
| GEO | Grass Roots economic Organizing |
| GEO | Geostationary Earth Orbiter/ing |
| GEO | Global Engagement Operations |
| GEO | Global Elite Operatives (gaming clan) |
| GEO | Groton Engineering Center (Electric Boat) |