ACS is a TLA that may stand for:

  • Action Code Script (Hexen game)
  • Administrative command system
  • Advanced Camera for Surveys (Hubble Space Telescope)
  • Agency Computer Systems Inc.
  • Alaska Communications Systems
  • American Camellia Society
  • American Canal Society
  • American Cancer Society
  • American Cannabis Society
  • American Carbon Society
  • American Carousel Society
  • American Ceramic Society
  • American Cetacean Society
  • American Cheese Society
  • American Chemical Society (acs.org)
  • American Clematis Society
  • American Cockatiel Society
  • American College of Sofia (acs.bg)
  • American College of Surgeons
  • American Colonization Society
  • American Community Schools of Athens (acs.gr)
  • American Community Schools, England
  • American Community Survey (US Census)
  • American Conifer Society
  • American Constitution Society
  • American Cryonics Society
  • Army Community Service (US)
  • Associated Colleges of the South (US)
  • Association for Canadian Studies
  • Association of Caribbean States
  • Australian Cinematographers Society
  • Australian Computer Society (acs.org.au)
  • Australian Correspondence Schools (acs.edu.au)
  • Australian Customs Service
  • Automobil Club der Schweiz (acs.ch)
  • Auxiliary Crane Ship (US Navy hull classification symbol)

ACS is the stock symbol for Affiliated Computer Services Inc.