SGS
- SEAL Team (TV series)
- SGS Essen
- SGS S.A.
- SGS/SCN
- STMicroelectronics
- Sale Grammar School
- Samogitian dialect
- Samsung Galaxy S
- Satellite ground station
- Saudi Geological Survey
- School of Graduate Studies, University of Toronto
- Schweizer Aircraft
- Search Guard Successor Foundation
- Seattle Girls' School
- Serbian Genealogical Society
- Shadow Government Statistics
- Showgrounds railway station, Melbourne
- Silicone gel sheeting
- Sisters of the Good Samaritan
- Sligo Grammar School
- Slough Grammar School
- South Georgia Survey
- South Georgia and the South Sandwich Islands
- South Gloucestershire and Stroud College
- South St. Paul Municipal Airport
- Spalding Grammar School
- St. George's School (disambiguation)
- Stafford Grammar School
- Steyning Grammar School
- Stockport Grammar School
- Stretford Grammar School
- Strong generating set
- Styling Garage
- Sulforaphane
- Supergirl (Japanese TV series)
- Sutton Grammar School
- Suva Grammar School
- Sydney Grammar School
- Śūraṅgama Samādhi Sūtra