| Acronym | Definition |
|---|
| GMO | Genetically Modified Organism |
| GMO | Group Member Organization |
| GMO | Gross Me Out |
| GMO | General Medical Officer |
| GMO | Global Media Online (various companies) |
| GMO | Glenn Miller Orchestra (est, 1938) |
| GMO | Grand Moyen-Orient (French: Greater Middle East) |
| GMO | Global Media Outreach (ministry) |
| GMO | Genmodifiserte Organismer (Norwegian: Genetically Modified Organism) |
| GMO | Guest Memory Operation |
| GMO | General Moving Object |
| GMO | Grants Management Officer |
| GMO | Greater Milwaukee Open (golf) |
| GMO | Geospatial Management Office (US DHS) |
| GMO | Glyceryl Monooleate |
| GMO | Genetiskt Modifierad Organism (Swedish: Genetically Modified Organism) |
| GMO | General Manager of Operations |
| GMO | Generalized Molecular Orbital |
| GMO | Glass Mountain Optics, Inc. |
| GMO | Generic Managed Object |
| GMO | Global Marine Observation(s) |
| GMO | General Management Office |
| GMO | GospelMusicOutlet.com (online music store) |