Ass may refer to:
The acronym ASS stands for:


The most common phonological and spelling variation of arse in American English, a word for the anus or for the buttocks
Ass, from Old English assa, ultimately from Latin asinus, is the older word for donkey.

• Wild ass may mean the wild donkey, or it may mean its wild relative the onager, also known as a "half ass" -another animal of the horse genus.
  Figuratively, a buffoon (fool, idiot, clown). The ass (donkey) typified clumsiness and stupidity since ancient times; asshead dates to 1550, to make an ass of oneself to 1590 - this has been conflated with "arse".
  "Asses" is also the (English and Latin) plural of the as, a Roman weight and unit of money.
  Abbreviation of assinatura, Portuguese for "sign(ature)".
  In Old Norse mythology, an Áss is one of the Æsir.
  Ass is the local name of the Italian commune of Asso.
  Ass variations include and are not limited to: ass hole, jackass, ass-o-lantern, etc.
  Ass is the title of a 1973 album by the band Badfinger.
  ASS (gene), a human gene that encodes for the enzyme argininosuccinate synthetase.
  ASS (car), made in France from 1919 to 1920.
  After school special (TV program).
  American Science and Surplus, a seller of surplus and educational goods, many of which are odd, amusing, and/or useful.
  Alness (National Rail code: ASS), a railway station in the United Kingdom station information; Location map; live departures and arrivals.
  The German generic term for Aspirin (short for Acetylsalicylsäure, acetylsalicylic acid), comparable to the term ASA in some English-speaking countries.
  Advanced SubStation Alpha, a subtitles format.
  Asshole (game), a card game also known as Ass.
  Angle-Side-Side, a faulty proof of congruency of two triangles (also called SSA).
  American Sociological Association, known as the American Sociological Society until 1959.
  Austrian Social Service, an Austrian non-profit organization.
  African sleeping sickness.
  Etymology OnLine - arse, ass and donkey