On math calculators ANS might stand for answer.

Anna Nicole Smith

Alexander Nikolayevich Scriabin (1872–1915), for whom the synthesizer was named

Autonomic nervous system

American National Standards, defined by the American National Standards Institute (ANSI)

Ahmet Necdet Sezer, 10th President of Turkey

ANS is a three-letter abbreviation which may refer to:

American Nuclear Society

Ansvarlig selskap, a Norwegian personal responsibility company model

ANS synthesizer, a Russian photoelectric musical instrument

American Numismatic Society

Ainsdale railway station, from its national rail code

ANS (box), a box set from the British band Coil

ANS (CD single), a single by the British band Coil

Andahuaylas Airport, from its IATA airport code

Algemeen Nijmeegs Studentenblad, a Dutch student magazine

Amman National School, Amman, Jordan

Autonomous Navigation System, for the prospective US Army's FCS subsystems