:''For the Belgian municipality, see [[Ans]].''

'''ANS''' is a [[three-letter abbreviation]] which may refer to:
* [[Advanced Network & Services, Inc.]], an Internet Service Provider, formed in September of 1990 as a nonprofit corporation dedicated to advancing education by accelerating the use of computer networking applications and technology. Sold to AOL in 1995, and finally to WorldCom in 1998.
* [[Advanced Networking Services]], an Intel software component
* [[Ahmet Necdet Sezer]], 10th President of Turkey
* [[Ainsdale railway station]], from its national rail code
* [[Algemeen Nijmeegs Studentenblad]], a Dutch student magazine
* American National Standards, defined by the [[American National Standards Institute]] (ANSI)
* [[American Nuclear Society]]
* [[American Numismatic Society]]
* [[Amman National School]], [[Amman]], [[Jordan]]
* [[Andahuaylas Airport]], from its IATA airport code
* [[Anna Nicole Smith]]
* [[ANS (box)]], a box set from the British band Coil
* [[ANS (CD single)]], a single by the British band Coil
* [[ANS synthesizer]], a Russian photoelectric musical instrument
**[[Alexander Nikolayevich Scriabin]] (1872–1915), for whom the synthesizer was named
* [[Ansvarlig selskap]], a Norwegian personal responsibility company model
* [[Applied Nano Surfaces]], a Swedish company selling tools that creates low friction surfaces when used in industrial processes
* [[Armée Nationale Sihanoukiste]], a Cambodian resistance group
* [[Astronomische Nederlandse Satelliet]], a Dutch X-ray satellite
* [[Autonomous Navigation System]], for the prospective [[United States Army|US Army]]'s [[Future Combat Systems|FCS]] subsystems
* [[Autonomic nervous system]]
* On [[math calculators]] ANS might stand for answer.
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