TGS is a three-letter acronym which may refer to:

Educational establishments

• Tadcaster Grammar School, North Yorkshire, England
• Takapuna Grammar School, Auckland, New Zealand
• The Geneva School, Winter Park, Florida
• Thetford Grammar School, Norfolk, England
• Think Global School, New York City, United States
• The Graduate School at Northwestern University. Illinois
• Tiffin Girls' School, Kingston upon Thames, England
• Tonbridge Grammar School, Tonbridge, England
• Toowoomba Grammar School, Toowoomba, Australia
• Tottenham Grammar School, London, England
• Townsville Grammar School, Townsville, Australia
• Trinity Grammar School, Melbourne, Australia
• Trinity Grammar School, Sydney, Australia

Companies

• TGS Management, American quantitative hedge fund
• Transportadora de Gas del Sur, a Southern Natural Gas Transportation Company in Argentina
• TGS-NOPEC Geophysical Company, a Norwegian geoscience data, software and service provider

Computing

• The Great Giana Sisters

Media

• Teen Girl Squad, a subcartoon from the Homestar Runner website cartoons
• Tokyo Game Show, a video game trade show held in Tokyo
• Taipei Game Show, a video game trade show held in Taipei
• Toulouse Game Show, a video game trade show held in Toulouse, France
• The Gathering Storm (novel), by Robert Jordan, of the Wheel of Time series
• The Gamer Studio, a video gaming website.
• The Girlie Show (fictional show), a fictional show in the television series 30 Rock
• The Greatest Showman, a 2017 musical film
• The Glass Scientists, an independent webcomic

Music

• The Glorious Sons, a Canadian rock band
• Tokyo Girls' Style, a Japanese girl group

Science

• Triglycine sulfate, a material used in infrared sensors
• Transcriptional gene silencing, a type of gene expression regulator

This disambiguation page lists articles associated with the title TGS.
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