| Acronym | Definition |
|---|
| GUO➣Global Urban Observatory (UN Human Settlements Programme) |
| GUO➣Global Ultimate Owner (highest parent company) |
| GUO➣Gayan Uttejak Orchestra (Hungary) |
| GUO➣Grand United Order (various organizations) |
| GUO➣Gezamenlijk Uitvoeringsorgaan (Dutch: Joint Implementation Body) |
| GUO➣Giant Ugly Ogre |
| GUO➣Glavnoye Upravleniye Okhraneniya (Russian: Main Administration Protection, aka GUORF) |