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'''ACS''' or '''Acs''' may refer to:
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==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
<!-- Do not include ACS Manufacturing Corporation as company does not have own article -->

==Computing==
* Access Control Server, a component of Cisco's [[Network Admission Control]]<!--OK 2nd link--> 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
* [[Abdominal compartment syndrome]]
* 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]]
* [[List of auxiliaries of the United States Navy#Auxiliary crane ships (T-ACS)|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 <!--they do not use "ACSA"-->
* [[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
* [[Solar sail#Advanced Composite Solar Sail System (ACS3)|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

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