# ACS

ACS or Acs may refer to:

## Aviation

* ACS-3, the military version of Raybird-3, a Ukrainian UAV
* Aerial Common Sensor, a Lockheed Martin reconnaissance aircraft airframe for the US Army and Navy
* Air Cess, a cargo airline based in Sharjah, United Arab Emirates
* IATA airport code for Achinsk Airport in Krasnoyarsk Krai, Russia

## 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
* 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

* 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
* Access Control Service, a cloud-based service for authentication and authorization
* ACS-1 and ACS-360, supercomputers designed but never completed in the 1960s by the IBM Advanced Computing Systems
* 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
* ATA Command Set

## 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

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

## Medicine

* 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
* 2-Amino-3-carboxymuconic semialdehyde, a chemical in tryptophan metabolism

## Military

* Army Combat Shirt, flame-resistant shirt developed for the US Army
* Attack Characterization System
* Auxiliary crane ship, a US Navy hull
* Cavalry Corps (Ireland) (1st Armoured Cavalry Squadron), an armoured reconnaissance unit of the Irish Army
classification symbol

## Organizations and societies

* Active Club Scotland, a far-right hate group linked to the worldwide Active Club Network
* 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, a professional not-for-profit organisation
* 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

## Places

* Ács, a Hungarian town

## Sports

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

## 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

* An abbreviation for Acroá language, an extinct Ge language of Brazil
* Acs (surname), a surname
* American Crime Story, an anthology television series