Other
- A Thin Shell, the third full album by October Tide
- 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 U.S. 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 World War II
- Cadillac ATS - A rival to the BMW 3 series from Cadillac
- Anime Talk Show, a 2004 Adult Swim television special
- IBM Administrative Terminal System (ATS/360)
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