GUO
| 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) |