GOS
- Gadolinium oxysulfide
- Galactic O star catalogue
- Galactooligosaccharide
- General ophthalmic services
- Geographical Operations System
- Georgia Ornithological Society
- Glasgow Outcome Scale
- Global Ocean Sampling Expedition
- Gloucestershire Old Spots
- Gos (Fils)
- Gos (bird)
- Government Offices for the English Regions
- Government of Sindh
- Grade of service
- Grange-over-Sands railway station
- GrapheneOS
- Green Oasis School
- Grid-oriented storage
- Gronings dialect
- Gross operating surplus
- Somersby Airfield