ACS or Acs may refer to:

Organizations and societies

* American Cancer Society, an American voluntary health organization dedicated to eliminating cancer * American Ceramic Society, an American professional organization * American Cheese Society, a professional organization of the American cheese industry * American Chemical Society, an American professional association * American College of Surgeons, a fellowship of American surgeons * American Colonization Society, an organization that helped in founding Liberia as a colony for freed slaves * American Constitution Society for Law and Policy, an organization of lawyers and law students in the US * American Cryonics Society, non-profit corporation that supports and promotes research and education into cryonics * American CueSports Alliance, a US-based pool league * Association of Caribbean States, an advisory, consultative body of Caribbean countries * Association of Cricket Statisticians and Historians, an association founded England in 1973 to collect cricket data * Audience Council Scotland, a BBC Trust organisation in Scotland * Australian Cinematographers Society * Australian Computer Society, an association for information and communications technology professionals * Australian Cricket Society, an association of cricket lovers * Redfern Aboriginal Children's Services, a community services organisation for Indigenous children in Sydney, Australia

Sports

* AC Sparta Prague, a Czech football club * AC Sporting, a Lebanese football club

Companies and commerce

* ACS:Law, a British law firm specializing in intellectual property cases * Advanced Card Systems, a Hong Kong-based developer of smart cards and smart card readers * Advanced Composites Solutions, a Brazilian engineering company specialized in composite materials technology * Advanced Contact Solutions, a Philippine business process outsourcing company * Affiliated Computer Services, an America business and technology outsourcing company * Air Cess, a cargo airline based in Sharjah, United Arab Emirates * 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 * Alternative compensation system, a way to allow reproduction of digital copyrighted works while still paying the authors and copyright owners * Applied Communication Sciences, a telecommunications research, engineering and consulting company based in the US * Grupo ACS (''Actividades de Construcción y Servicios''), a civil engineering firm based in Madrid, Spain

Computing and technology

* ACS-1 and ACS-360, supercomputers designed but never completed in the 1960s by the IBM ''Advanced Computing Systems'' * Access Control Service, a cloud-based service for authentication and authorization * Access Control Server, a component of Cisco's Network Admission Control technology * Access Control Server, the server authenticating a card in the 3-D Secure framework * Action Code Script, a scripting language used in video games such as ''HeXen'' and ''Doom'' ports * Adobe Creative Suite, a software package by Adobe Inc. * Advanced Camera for Surveys, an instrument aboard the Hubble Space Telescope * Air cavity system, a modern marine craft design concept based upon capturing air beneath a vessel's hull to reduce drag and increase speed and fuel efficiency * Atacama Large Millimeter Array ("ALMA") Common Software, a control framework used in ground-based astronomy projects * Attitude control system, a spacecraft system * Audit Collection Services, a component of Microsoft System Center Operations Manager

Education

* ACS International Schools, a group of international schools in the UK * Advanced Communicator, Silver ("ACS"), Toastmasters International Recognition for advanced Communication training * Alabaster City Schools, a school district headquartered in Alabaster, Alabama * Alperton Community School, a secondary school in London, UK * American College of Sofia, a secondary school in Sofia, Bulgaria * American Community School at Beirut, an international private school located in Beirut, Lebanon * American Community School in Amman, an international school in Amman, Jordan * American Community School of Abu Dhabi, an international school of Abu Dhabi, United Arab Emirates * American Community Schools, an English-speaking private school system in Athens, Greece * American Cooperative School of La Paz * American Cooperative School of Tunis * Anglo-Chinese School, Singapore, a group of Methodist schools in Singapore * Anglo-Chinese Schools, Malaysia, a group of Methodist schools in Malaysia * Arkansas Correctional School, a school system in prisons, in Arkansas * Associated Colleges of the South, a group of liberal arts colleges in the US * Assumption College School, a catholic high school in Ontario, Canada * Aurora Christian Schools, a private PreK-12 school in Aurora, Illinois, US * Avery Coonley School, a private elementary school in Downers Grove, Illinois, US * Lehman Alternative Community School, a combined middle and high school Ithaca, New York

Government

* American Community Survey, a project of the US Census Bureau * Administration for Children's Services, governmental agency of New York City * Australian Customs Service, former Australian government agency responsible for Australian border protection (1985–2009)

Medicine and science

* 2-Amino-3-carboxymuconic semialdehyde, a chemical in tryptophan metabolism * Acetyl-CoA Synthetase, an enzyme * Acute Compartment syndrome * Acute coronary syndrome, a form of chest pain due to reduced oxygen supply to the heart muscle * Advanced Cataract Surgery, the modern method of cataract removal using phacoemulsification * Anticenter shell, a supershell located outside of the galaxy * Atriocaval shunt, a surgical procedure

Military

* Attack Characterization System * Aerial Common Sensor, a Lockheed Martin reconnaissance aircraft airframe for the US Army and Navy * Army Combat Shirt, flame-resistant shirt developed for the US Army * Auxiliary crane ship, a vessel of the US Navy * Cavalry Corps (Ireland) (1st Armoured Cavalry Squadron), an armoured reconnaissance unit of the Irish Army

Places

* Ács, a Hungarian town * Achinsk Airport, an airport in Krasnoyarsk Krai, Russia (IATA: ACS)

Other uses

* Acs (surname), a surname * An abbreviation for Acroá language, an extinct Ge language of Brazil {{disambiguation