TCS may stand for:

• Tactical cryptologic system
• Taiwanese Cultural Society
• Taking Children Seriously (tcs.ac)
• Tata Consultancy Services (tcs.com)
• Taxpayers for Common Sense
• Tech Central Station
• Television Corporation of Singapore
• Temperature compensation sensor
• The Cambridge Student
• The Coastal Society
• The Crustacean Society
• Theoretical computer science
• Thermal control subsystem
• This Comic Sucks
• Tongass Conservation Society
• Toronto Choral Society
• Total cross section
• Total customer satisfaction
• Touring Club Suisse (tcs.ch)
• Train Collectors Society
• Treasury Communications System (USA)
• Troop carrier squadron
• Trusted computer system
• Tucson Computer Society
• Tulsa Computer Society (tcs.org)
• Twickenham Choral Society

Control systems:

• Tactical control system
• Telescope control system
• Test control system
• Thermal control system
• Traction control system
• Train control system
• Trajectory control system
• Transaction control system
• Turbine control system