GSS
- Civic Alliance of Serbia
- Croatian Mountain Rescue Service
- GLBT Aggies
- GSS Institute of Technology
- Galileo (satellite navigation)
- Garibaldi Secondary School
- General Security Service (Syria)
- General Social Survey
- Generic Security Services Application Program Interface
- Genome survey sequence
- Gerstmann–Sträussler–Scheinker syndrome
- Ghana Statistical Service
- Ghost Shadows
- Global Standards Symposium
- Global Supply Systems
- Glutathione synthetase
- Good Samaritan Society
- Government Secondary School (disambiguation)
- Government Statistical Service
- Granulomatous slack skin
- Graph Style Sheets
- Graph-structured stack
- Great Singapore Sale
- Greek Sign Language
- Greenridge Secondary School
- Grimsby Secondary School
- Grupo Silvio Santos
- Grønlands Seminarius Sportklub
- Gudjonsson suggestibility scale
- Guild of Servants of the Sanctuary
- Gurpreet Singh Sandhu
- Panionios G.S.S.
- Shin Bet