• ATS Wheels (Auto Technisches Spezialzubehör), a German wheel manufacturer and sponsor of a Formula One racing team
• ATS Automation Tooling Systems, an Ontario, Canada-based factory automation company
• ATS Euromaster, a European tyre service supplier
• Automobili Turismo e Sport, an Italian automotive manufacturer and Formula One car constructor

• Alternative trading system, SEC classification in US equity trading
• Austrian schilling (ISO 4217 currency code: ATS), former currency of Austria
• Automated trading system, a computer program that creates and submits orders to a financial exchange

• Alien Tort Statute, a US law
• Antarctic Treaty System, regulating Antarctica
  • Antarctic Treaty Secretariat, the associated organisation based in Argentina
• Australian Treaty Series

• Adventist Theological Society, a nonprofit organization of Seventh-day Adventists
• American Temperance Society, a former US organization
• American Thoracic Society, a medical society
• American Tract Society, a nonprofit religious publishing house
• Antique Telescope Society, US
• Swiss Telegraphic Agency (Agence télégraphique suisse), a non-profit press agency of Switzerland

Education edit

• Ai Tong School, a primary school in Singapore
• Asian Theological Seminary, seminary in the Philippines
• Association of Theological Schools in the United States and Canada
• Association of Trust Schools, in Zimbabwe

Military and law enforcement edit

• Anti-Terrorism Squad, India
• Anti-Terrorist Squad, former name of the Special Tactics Group, New Zealand
• Auxiliary Territorial Service, World War II women's branch of the British Army

• Aerobic treatment system, for sewage
• Ammonium thiosulfate, a compound
• Amphetamine transdermal system, in medicine
• Applications Technology Satellite, an experimental fleet of satellites launched by NASA
• Automatic transfer switch, which switches an electricity supply to a standby source

Computing edit

• Apache Traffic Server, a reverse proxy and forward proxy server
• Applicant tracking system, recruitment software
• App Transport Security, part of iOS
• ATS (programming language) (Applied Type System)
• Automate the Schools, school administration system in New York City, US
• Automated Targeting System, used to identify entrants to the US who may be criminals
• Automated trading system, a computer program that creates and submits orders to a financial exchange

• Air traffic service, a service which regulates and assists aircraft in real-time to ensure their safe operations
• Airport Transit System, a U.S. rail system at Chicago O'Hare International Airport, Illinois
• Automatic train stop, a system that stops a train in certain situations to prevent accidents
• Automatic train supervision, a module within CBTC

Vehicles edit

• Cadillac ATS, a car model produced by Cadillac
• Boeing Airpower Teaming System, an Australian unmanned aircraft which incorporates artificial intelligence and utilizes a modular mission package system
• Salvage and rescue ship (US Navy hull classification symbol: ATS), see List of auxiliaries of the United States Navy

• American Truck Simulator, a 2016 vehicle simulation video game developed by SCS Software
• "Against the spread", in betting
• Alberta Township System, a land surveying system used in Western Canada
• Ats (given name)

• IBM Administrative Terminal System (ATS/360)