SGS is a three letter acronym that can stand for:
- Serene Global Services Pvt.Ltd
- Seattle Girls' School
- SGS Industrial Services
- SGS S.A.
- Società Generale Semiconduttori - Aquila Tubi E Semiconduttori (SGS-ATES, "Semiconductor General Society - Tubes and Semiconductors Aquila"), later SGS Microelettronica, a former Italian company now merged into STMicroelectronics
- Small Group Solutions, Inc., A (US) wholesaler of group insurance
- Société Générale de Surveillance (French for "Inspection General Society")
- South Georgia and the South Sandwich Islands: ISO 3166 trigram
- South Georgia Survey, four expeditions (1951–1957) led by V. Duncan Carse which mapped the South Georgia Antarctic archipelago.
- Svenska Genealogiska Samfundet (Swedish for "Swedish Genealogical Society")
- Strong generating set, a concept in the group theory of mathematics
- Sisters of the Good Samaritan
- Sligo Grammar School
- Slough Grammar School
- South Gloucestershire and Stroud College
- Spalding Grammar School
- Stafford Grammar School
- Steyning Grammar School
- Stockport Grammar School
- Stretford Grammar School
- Sutton Grammar School
- Sydney Grammar School
- The Search Guard Successor Foundation, a fictional organization in the Japanese Super Sentai show, GoGo Sentai Boukenger
- Satellite ground station
- Sulforaphane Glucosinolate A natural antioxidant compound in broccoli
- Serbian Genealogical Society Serbian Genealogical Society
- Saudi Geological Survey
- SGS Statistical Services
- Samsung Galaxy S, an Android smartphone
- Group of proteins which are secreted by some insects before metamorphosis