ACS

ACS is a three-letter acronym that may refer to:

American

• American Cancer Society, an American medical organization
• American Chemical Society, an American professional association
• American Colonization Society
• American Community Survey, a project of the U.S. Census Bureau
• American Constitution Society for Law and Policy, or simply "American Constitution Society", a non-profit educational organization
• American Cryonics Society
• American College of Surgeons
• The Alliance for Community Supports
• American Cetacean Society, a whale protection organization

Australian

• Australian Cinematographers Society
• Australian Computer Society
• Australian Customs Service

British

• Accredited Certification Scheme by which gas installers' competence in various types of gas work is certified (a prerequisite for CORGI registration)

Education

• Alternative Community School, former name of Lehman Alternative Community School of Ithaca, New York, United States
• American College of Sofia, a Bulgarian secondary school
• ACS International Schools, formerly American Community Schools, a group of schools in southern England
• Anglo-Chinese School, Singapore
• Anglo-Chinese Schools, Malaysia
• Associated Colleges of the South (United States)
• Assumption College School
• American Community Schools, an English-speaking private school system in Athens, Greece
• Avery Coonley School, a private k-8 school in Downers Grove, Illinois

Aviation and the Navy

• Air Cess (Liberia), from its ICAO airline designator
• Auxiliary Crane Ship (US Navy hull classification symbol)
• Aerial Common Sensor, a reconnaissance aircraft airframe developed by Lockheed Martin

Science, Technology, and Medicine

• Action Code Script, a scripting language used in video games such as HeXen and modern Doom ports
• Advanced Camera for Surveys, an instrument aboard the Hubble Space Telescope
• Acute coronary syndrome, a form of chest pain due to reduced oxygen supply to the heart muscle
• ACS-1 and ACS-360, a supercomputer designed (but never completed) by the IBM Advanced Computing Systems group in the 1960s
• American College of Surgeons

Companies

• ACS, Inc., an international design and construction services provider for automotive, science and technology research facilities
• ACS Benefit Services, Inc., an American Third party administrator of Self-funded health care plans
• Actividades de Construcción y Servicios, S.A. (IBEX-35 stock symbol: ACS) Madrid, Spain
• Advanced Composites Solutions, engineering company specialized in composite materials technology
• Aerial Camera Systems, a specialist broadcast camera company based in Godalming, Surrey, U.K.
• Affiliated Computer Services (stock symbol: ACS)
• Alaska Communications System, former name of AT&T Alascom, an American communications services company
• Alaska Communications Systems, an American communications services company, distinct from "AT&T Alascom"
• Applied Computer Systems, Inc., a small American company in video and audio networking
• Automated Church System (ACS Technologies)

Other

• Adam Carolla Show, American morning radio program
• Alternative compensation system
• Apolyton Civilization Site
• Association of Caribbean States
• Association of Cricket Statisticians and Historians
• Antichrist Superstar, a rock album by Marilyn Manson