SG
- .sg
- Canton of St. Gallen
- Gibson SG
- Jetsgo
- Quality-adjusted life year
- Relative density
- SG (cigarette)
- SG (song)
- SG Automotive
- SG Wannabe
- SG-1000
- SG-43 Goryunov
- Sabado Gigante
- Saint Gabriel's College
- Sango language
- Sanspareils Greenlands
- Scots Guards
- Seaborgium
- Secretary General
- Selena Gomez
- Sempati Air
- Shooting guard
- Shotgun
- Singapore
- Société Générale
- Special Group (India)
- SpiceJet
- Spy Groove
- St. Gall Priscian Glosses
- Star of Gallantry
- Stargate
- Steins;Gate
- Straż Graniczna
- Stress granule
- SuicideGirls
- System Group