| Acronym | Sense | Language | Topics |
|---|---|---|---|
| GEO | Geosynchronous Earth Orbit | In English | → Astronautics |
| GEO | Gene Expression Omnibus (www.ncbi.nlm.nih.gov/geo/) | In English | → Genetics → Biotechnology |
| GEO | Garmerwolde En Omstreken | In Dutch | → Organizations and associations → Sport, physical exercises |
| GEO | Group on Earth Observations (www.earthobservations.org) | In English | → Organizations and associations → Astronautics → Earth sciences |
| GEO | Group Employment Opportunities | In English | → Personnel management |
| GEO | Geostationary Earth Orbit | In English | → Astronautics |