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ACS or Acs may refer to:

• 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

• 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

• 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

• 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

• 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)
• New York City Administration for Children's Services, governmental agency of New York City

• 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

• 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

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• 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
• Automobile Club of Switzerland, a Swiss motor sports organization
• Redfern Aboriginal Children's Services, a community services organisation for Indigenous children in Sydney, Australia

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

• 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

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

• Ács, a Hungarian town

This disambiguation page lists articles associated with the title ACS.
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