ATS can mean:

Societies[link]

• Adventist Theological Society
• American Temperance Society, an early American civic organization promoting temperance
• American Thoracic Society, a society for lung physicians, health related professionals and researchers

Systems[link]

• Airport Transit System, a rail system at Chicago O'Hare International Airport
• Alberta Township System, a land surveying system used in Western Canada
• Alternative Trading Systems, the SEC's general classification for equity exchange alternatives in US equity trading
• Amtrak Telephone System, an internal network
• Antarctic Treaty System
• Applicant tracking system
• ATS Automation Tooling Systems
• Automated Targeting System, a United States government rating system used to help assess the probability that a visitor to the U.S. is a terrorist or criminal
• Automated trading system

Services[link]

• Air traffic service
• Assistive technology service provider
• Automatic transfer service account
• Auxiliary Territorial Service, the women's branch of the British Army in World War II

Schools[link]

• Ai Tong School, a primary school in Singapore
• Archbishop Temple School, a Church of England high school, United Kingdom
• Archbishop Tenison's Church of England schools (disambiguation), also called Archbishop Tenison's Schools
• Asbury Theological Seminary, a Methodist seminary based in Wilmore, Kentucky
• Association of Theological Schools in the United States and Canada, the primary accreditation agency for North American seminaries

Other[link]

• A Thin Shell
• A Thousand Suns, the fourth studio album by Linkin Park
• Algal Turf Scrubber
• Alien Tort Statute
• American Tribal Style Belly Dance
• Amphetamine-type stimulant
• Angel (TV series) (AtS)
• Anti-Terrorist Squad (disambiguation)
• Antoinette Tubman Stadium in Monrovia, Liberia
• Advanced Training School, a training program founded in the TX Wing of the US Civil Air Patrol
• Audio Title Set, one of the directories present on a DVD, see DVD-Audio
• Australian Treaty Series
• Austrian schilling, the ISO 4217 currency code for the former currency of Austria
• Automate The Schools, the Student Information System of the New York City Department of Education
• Automatic train stop
• Automatic Transfer switch, in an electrical system, switches power automatically to a generator or other standby power source after a power interruption.
• Automobili Turismo e Sport, an Italian low-volume automotive manufacturer and Formula One team that operated between 1962 and 1965
• ATS (programming language)
• ATS (wheels), a German wheel manufacturer that was active as a Formula One team from 1977 to 1984
• ATS Euromaster, European tyre service supplier
• Alpha Theta Sigma, a Filipino fraternity - see List of fraternities and sororities in the Philippines
• Above Top Secret, an internet forum
• Athens Tourism Symposium
• Ah Ti Suka - A pronouncement that is supposed to express frustration
• Auxiliary Territorial Service - the women's branch of the British Army during the Second World War
• Cadillac ATS - A rival to the BMW 3 series from Cadillac
• Anime Talk Show, a 2004 Adult Swim television special

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