ACS

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 American 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

 * 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: Beyond Heretic
 * Adobe Creative Suite, a software package by Adobe Inc.
 * Atacama Large Millimeter Array ("ALMA") Common Software, a control framework used in ground-based astronomy projects
 * 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 USA
 * Assumption College School, a catholic high school in Ontario, Canada
 * Aurora Christian Schools, a private PreK-12 school in Aurora, Illinois, USA
 * Avery Coonley School, a private elementary school in Downers Grove, Illinois, USA
 * 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 for border protection, duties and taxes (1985–2009)

Medicine

 * 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
 * Alternate care site, a non-traditional medical treatment facility established in a public health crisis
 * 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 US Navy hull classification symbol
 * Cavalry Corps (Ireland) (1st Armoured Cavalry Squadron), an armoured reconnaissance unit of the Irish Army
 * ACS-3, the military version of Raybird-3, a Ukrainian UAV

Places

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

Technology and science

 * Advanced Camera for Surveys, an instrument aboard the Hubble Space Telescope
 * Advanced Composite Solar Sail System (ACS3), a NASA technology demonstration for future small spacecraft
 * 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
 * Anticenter shell, a supershell located outside of the galaxy
 * Attitude control system, a spacecraft system

Other uses

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