AT may mean:
- Aarne-Thompson classification system
- AT Field, a force field in the anime Neon Genesis Evangelion
- Acceptance test
- Air Trecks, fictional inline skates in the manga and anime Air Gear
- Alimentary tract
- Atmel Corporation
- Anaerobic threshold
- Análisis Transaccional (Spanish "Transactional analysis"), a psychological method
- Anguilla, a World Meteorological Organization country code
- Anti-tamper, resistance to tampering of a product, package, or system
- Anti-tank weapons
- Counter-terrorism, also known as "anti-terrorism" (AT)
- Appalachian Trail
- Aphex Twin
- Appropriate Technology
- Ashmore and Cartier Islands (FIPS 10-4 territory code and obsolete NATO country code
- Assistive technology
- Ashley Tisdale, actor and singer
- IBM Personal Computer/AT
- AT form factor for motherboards and computer cases
- The common name for the 5-pin DIN keyboard connector
- Ataxia telangiectasia, an immunodeficiency disorder
- Atchison County, Kansas (county code)
- Attack Team (game), a 2000 computer game
- Audit trail
- Austria's ISO, 2-letter country code
- .at is the Internet country code top-level domain for Austria
- Automatic transmission
- Hayes command set for computer modems (all commands begin with the characters "AT")
- Royal Air Maroc (IATA airline designator)
- Abel Tasman, a seventeenth century Dutch explorer and merchant
At may mean:
- Ampere-turn (symbol), an International System of Units (MKS) unit of magneto-motive force
- Astatine, the chemical symbol for the element
- a subdivision equal to 1/100 of a Kip, the unit of currency in Laos
aT may mean:
at may mean:
- "@", the punctuation symbol now typically used in e-mail addresses
- at (Unix), to schedule tasks to be performed at a later date
- at (Windows), to schedules other commands to be run at a certain time
- technical atmosphere (symbol), physical unit of pressure
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